Psychiatry

814 questions

Question 21Question →

A 46-year-old female accountant is referred to the outpatient psychiatry clinic due to an 8-month history of excessive, uncontrollable worry regarding her finances, job security, and health. She describes feeling constantly "on edge," suffers from severe muscle tension in her neck and shoulders, and struggles with initial insomnia. These symptoms began shortly after she underwent a lumpectomy and localized radiation for estrogen receptor-positive, human epidermal growth factor receptor 2 (HER2)-negative breast cancer. She is currently taking tamoxifen and frequently complains of bothersome, spontaneous hot flashes occurring both during the day and at night. Vital signs are within normal limits. Which of the following is the most appropriate pharmacotherapy for this patient's psychiatric condition?

Show answer & explanation

Answer: Venlafaxine

Answer

The correct answer is Venlafaxine.
This patient meets the DSM-5 criteria for Generalized Anxiety Disorder (GAD), presenting with more than 6 months of excessive worry associated with feeling "on edge," muscle tension, and insomnia. Furthermore, she is experiencing tamoxifen-induced vasomotor symptoms (hot flashes). Venlafaxine, a serotonin-norepinephrine reuptake inhibitor (SNRI), is the ideal choice. It is a first-line pharmacotherapy for GAD and is highly efficacious in reducing both the frequency and severity of vasomotor symptoms. Most importantly, venlafaxine exerts minimal to no inhibitory effect on the cytochrome P450 2D6 (CYP2D6) enzyme. Tamoxifen is a prodrug that requires activation by CYP2D6 to form its highly active metabolite, endoxifen. Therefore, venlafaxine safely treats both her GAD and hot flashes without compromising the efficacy of her breast cancer adjuvant therapy.

Step-by-Step Solution

1
Diagnose the primary psychiatric condition based on the clinical presentation.
The patient has Generalized Anxiety Disorder (GAD), characterized by >6 months of excessive worry and at least 3 somatic symptoms (feeling on edge, muscle tension, insomnia).
Establishing the diagnosis determines the appropriate class of psychiatric medications (SSRIs or SNRIs).
2
Identify concurrent medical conditions and active pharmacological treatments.
The patient has a history of ER-positive breast cancer, is actively taking tamoxifen, and suffers from severe vasomotor symptoms (hot flashes).
Psychiatric medication selection must account for drug-drug interactions and aim to treat comorbid symptoms if possible.
3
Analyze the metabolic pathway of tamoxifen and the interaction profiles of potential psychotropics.
Tamoxifen is a prodrug requiring activation by the hepatic enzyme CYP2D6 to its active metabolite, endoxifen. Strong CYP2D6 inhibitors must be avoided.
Inhibiting CYP2D6 reduces the oncologic efficacy of tamoxifen, significantly increasing the risk of cancer recurrence.
4
Select the optimal agent that treats GAD, alleviates hot flashes, and lacks CYP2D6 inhibition.
Venlafaxine is selected because it is first-line for GAD, highly effective for vasomotor symptoms, and has minimal to no CYP2D6 inhibitory effects.
This single agent safely addresses both her psychiatric and somatic complaints without compromising her breast cancer treatment.

Key Concept

In patients taking tamoxifen, the management of Generalized Anxiety Disorder (GAD) and vasomotor symptoms requires the selection of an SSRI/SNRI with minimal CYP2D6 inhibition (e.g., venlafaxine, escitalopram) to avoid blocking the conversion of tamoxifen into its active metabolite, endoxifen.
Estimated Time:2m 0s
Question 22Question →

Evaluate the clinical scenarios below and match each patient to the most appropriate next step in psychiatric management.

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Items

A 31-year-old primigravida at 14 weeks gestation is brought for urgent psychiatric evaluation. She exhibits profound psychomotor retardation and a steadfast, delusional belief that her internal organs are decomposing. She has refused all food and fluids for five days and appears severely dehydrated.
An otherwise healthy 24-year-old woman seeks help for a two-month history of sleeping 14 hours a day, hyperphagia, and severe depressed mood. Her medical history reveals a hospitalization three years ago following a two-week period of sleeplessness, pressured speech, and grandiose delusions. She currently takes no medications.
Three weeks following an anterior ST-elevation myocardial infarction complicated by heart failure, a 58-year-old man develops pervasive sadness, feelings of worthlessness, and passive suicidal ideation that severely impacts his cardiac rehabilitation.
A 52-year-old man with chronic, severe depression presents for consultation. He continues to experience debilitating anhedonia despite documented, adequate therapeutic trials of escitalopram, duloxetine, and venlafaxine augmented with aripiprazole. He adamantly refuses electroconvulsive therapy due to fears of memory impairment.

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Answer

The pregnant patient with inanition requires inpatient admission and ECT. The 24-year-old woman with a history of mania requires quetiapine monotherapy. The post-MI patient should be started on sertraline. The patient with treatment-resistant depression refusing ECT should receive intranasal esketamine.
Each correct pairing matches a nuanced psychiatric presentation with its safest and most evidence-based management strategy. ECT provides the rapid response required for inanition in pregnancy. Quetiapine treats bipolar depression without risking manic switch. Sertraline provides cardiac safety post-MI. Esketamine bypasses treatment resistance when ECT is refused.

Step-by-Step Solution

1
Analyze the pregnant patient's presentation (Left 1).
Identified psychotic depression with life-threatening inanition and fluid refusal.
Determines the need for rapid, safe intervention (ECT) over slower-acting pharmacotherapy, prioritizing fetal and maternal survival.
2
Evaluate the 24-year-old woman's history (Left 2).
Recognized a current depressive episode in the context of a past hospitalized manic episode (Bipolar I disorder).
Avoids the critical error of prescribing antidepressant monotherapy, guiding the choice toward bipolar-specific treatments like quetiapine.
3
Assess the 58-year-old man's medical comorbidities (Left 3).
Identified major depressive disorder occurring post-myocardial infarction.
Dictates the selection of a cardiac-safe antidepressant with low potential for CYP450 interactions, making sertraline the optimal choice.
4
Review the 52-year-old man's treatment history (Left 4).
Confirmed treatment-resistant depression (failed >2 classes) with a specific refusal of electroconvulsive therapy.
Guides the selection of advanced TRD therapies, specifically intranasal esketamine, which is evidence-based for this exact presentation.

Key Concept

Management of depressive disorders requires tailoring interventions to specific subtypes (e.g., psychotic features), identifying bipolar vs. unipolar disease to avoid manic switch, ensuring cardiovascular safety in comorbid patients, and escalating to interventional therapies for treatment resistance.
Question 23Question →

A 32-year-old man is evaluated in the psychiatric clinic as part of a court-mandated diversion program following an arrest for assault. During the interview, the patient is superficially charming but shows no remorse for his actions, stating, 'The guy was asking for it.' His medical records show a history of conduct disorder diagnosed at age 14, multiple arrests for theft, and chronic deceitfulness. He is currently prescribed fluoxetine by his primary care physician for mild depressive symptoms. He frequently demands early refills of controlled substances from various providers, although none are currently prescribed. He mentions that during periods of extreme frustration, he occasionally feels 'paranoid that people are out to get me' for a few days, but these feelings quickly resolve. Which of the following are the most appropriate considerations in the evaluation and management of this patient? (Select 2 choices)

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Answer: Implementation of strict clinical boundaries and avoidance of prescribing medications with high abuse potential; Evaluation and treatment of common comorbid conditions, such as substance use disorders

Answer

The correct steps are implementing strict clinical boundaries with avoidance of abuse-potential medications, and evaluating for comorbid substance use disorders.
The patient's history of conduct disorder, deceitfulness, recurrent arrests, and lack of remorse are diagnostic of antisocial personality disorder (ASPD). There is no definitive pharmacological or psychotherapeutic cure for ASPD. Therefore, the standard of care focuses on managing the clinical relationship and addressing treatable comorbidities. Patients with ASPD frequently exhibit drug-seeking behavior and manipulation; thus, providers must establish firm, consistent boundaries and avoid prescribing medications with high abuse potential (e.g., benzodiazepines, stimulants). Additionally, patients with ASPD have a high prevalence of comorbid substance use and mood disorders, making the evaluation and treatment of these comorbidities a critical component of their overall care.

Step-by-Step Solution

1
Identify the primary personality disorder diagnosis.
The patient exhibits a pervasive pattern of disregard for others, lack of remorse, deceitfulness, and a history of conduct disorder before age 15. This confirms Antisocial Personality Disorder (ASPD).
Establishing the diagnosis guides the therapeutic approach and sets expectations for patient behavior.
2
Determine appropriate management strategies for ASPD.
Management involves setting strict, non-punitive boundaries, declining requests for medications with abuse potential, and treating comorbid conditions like substance use disorder.
ASPD has no specific pharmacological cure, and patients frequently display drug-seeking behavior. Addressing treatable comorbidities offers the best clinical outcome.
3
Rule out contraindicated pharmacological interventions.
Adding a monoamine oxidase inhibitor (MAOI) is rejected.
The patient is currently taking fluoxetine (an SSRI). Combining these medications risks life-threatening serotonin syndrome.
4
Exclude incorrect psychiatric diagnoses based on timeline and symptom severity.
Schizophreniform disorder is ruled out.
The patient's paranoid feelings are transient (lasting only a few days). Schizophreniform disorder requires psychotic symptoms to be present for at least one month.
5
Assess ethical obligations regarding confidentiality.
Notifying the employer is deemed inappropriate.
There is no specific, imminent threat to a third party that justifies overriding patient confidentiality.

Key Concept

Antisocial Personality Disorder Evaluation and Management
Question 24Question →

Match each clinical presentation of cognitive decline to its most likely underlying pathophysiologic mechanism.

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Items

A 67-year-old man presents with a 3-month history of rapidly progressive memory loss, akinetic mutism, and sudden, brief muscle jerks elicited by loud noises.
A 59-year-old woman exhibits a 2-year history of socially inappropriate comments, compulsive consumption of sweets, and profound apathy, with preserved visuospatial skills.
A 74-year-old man develops progressive cognitive impairment, pronounced fluctuations in daytime alertness, vivid hallucinations of animals, and a new-onset resting tremor.
A 71-year-old woman with a long-standing history of medication-noncompliant hypertension experiences abrupt declines in executive function separated by periods of stability, along with a right-sided Babinski sign.
A 76-year-old man presents with an insidious onset of a broad-based, magnetic gait, urinary urgency culminating in incontinence, and generalized cognitive slowing over 8 months.

Matches

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Answer

The correct pairings match Creutzfeldt-Jakob disease to prion misfolding, frontotemporal dementia to tau/TDP-43 accumulation, Lewy body dementia to alpha-synuclein inclusions, vascular dementia to ischemic white matter injury, and normal pressure hydrocephalus to impaired cerebrospinal fluid reabsorption.
Each clinical vignette provides classic hallmark features of a specific neurocognitive disorder, which directly corresponds to a unique pathophysiologic mechanism. Creutzfeldt-Jakob disease is caused by prion misfolding. Frontotemporal dementia is caused by tau or TDP-43 inclusions. Lewy body dementia is caused by alpha-synuclein aggregation. Vascular dementia is caused by ischemic white matter injury from small vessel disease. Normal pressure hydrocephalus is caused by impaired cerebrospinal fluid reabsorption leading to ventricular expansion.

Step-by-Step Solution

1
Analyze the first clinical presentation (rapid cognitive decline, startle myoclonus).
Identify Creutzfeldt-Jakob disease.
Recognize the classic triad of rapidly progressive dementia, myoclonus, and akinetic mutism.
2
Analyze the second presentation (social disinhibition, hyperorality).
Identify behavioral variant frontotemporal dementia.
Note the early personality changes and compulsive behaviors with relatively spared memory.
3
Analyze the third presentation (fluctuations, visual hallucinations, parkinsonism).
Identify Lewy body dementia.
Recognize the core criteria for this specific alpha-synucleinopathy.
4
Analyze the fourth presentation (stepwise decline, asymmetric reflexes).
Identify vascular dementia.
Note the temporal relationship with vascular risk factors (hypertension) and focal neurologic findings.
5
Analyze the fifth presentation (magnetic gait, incontinence, cognitive slowing).
Identify normal pressure hydrocephalus.
Recognize the classic triad of wacky, wobbly, and wet.
6
Match each identified syndrome to its underlying pathophysiology.
Map each clinical entity to its defining cellular or macroscopic mechanism.
To complete the matching set correctly by connecting clinical diagnoses with their established etiologies.

Key Concept

Distinct clinical presentations of neurocognitive disorders directly correlate with specific pathophysiologic mechanisms, such as abnormal protein aggregations or structural brain changes.
Question 25Question →

A 58-year-old woman is admitted to the hospital for management of a deep vein thrombosis. A psychiatric consultation is requested because she refuses her prescribed heparin infusion. The patient states she has a "sixth sense" that hospital medications contain micro-crystals designed to negatively alter her aura. She has lived alone in a rural cabin for 30 years, making a living selling energy-infused stones online. During the interview, she speaks in a vague, overly elaborate manner and appears highly anxious around the nursing staff, attributing her fear to their "disruptive energy fields." Collateral history from her visiting sister confirms that the patient has exhibited these eccentric beliefs and a preference for intense isolation since her early 20s. The sister also notes the patient has experienced fatigue and poor sleep over the past two weeks due to leg pain. Frustrated by the situation, the sister demands that the physician administer the heparin regardless of the patient's objections to prevent a pulmonary embolism.

Which of the following statements regarding the diagnosis and management of this patient are correct? (Select all that apply)

Select all that apply

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Answer: The patient's lifelong pattern of social deficits, magical thinking, and eccentric behavior without frank psychosis indicates a Cluster A personality disorder.; The treatment team should adopt a professional, straightforward communication style, respecting her need for emotional distance to build therapeutic rapport.

Answer

The correct statements recognize that the patient's lifelong eccentricities point to a Cluster A personality disorder, and that the medical team should respect her need for emotional distance to build therapeutic rapport.
Schizotypal personality disorder is defined by a pervasive pattern of eccentric behavior, magical thinking, odd speech, and intense social anxiety that does not improve with familiarity. These traits must be present since early adulthood and occur independently of a primary psychotic disorder. Management of these patients in a medical setting requires a professional, non-intrusive approach to minimize their inherent paranoia and build sufficient trust for medical interventions.

Step-by-Step Solution

1
Analyze the psychiatric presentation and timeline.
The patient exhibits magical thinking ('sixth sense', 'auras'), odd speech, and social anxiety dating back to early adulthood.
Establishing the onset and nature of symptoms is necessary to differentiate personality disorders from primary psychotic disorders.
2
Differentiate from primary psychotic and mood disorders.
The patient lacks true fixed delusions or hallucinations (ruling out schizophrenia) and her acute fatigue is linked to physical illness, not bipolar depression.
Schizophrenia requires at least 1 month of active-phase psychosis. Misdiagnosing mood symptoms could lead to inappropriate pharmacological interventions, such as dangerous SSRI monotherapy in bipolar disorder.
3
Evaluate the ethical conflict regarding medical decision-making.
The patient's psychiatric diagnosis does not automatically invalidate her capacity to refuse heparin.
Capacity must be individually assessed based on understanding and reasoning. Bypassing a capacitated patient for a surrogate decision-maker is an ethical violation.
4
Determine the optimal management strategy.
The most effective approach is to maintain professional boundaries and respect her need for interpersonal distance.
Patients with schizotypal personality disorder experience severe anxiety with close interpersonal contact; a neutral, clear approach prevents worsening paranoia and facilitates medical care.

Key Concept

Diagnosis of Schizotypal Personality Disorder requires recognizing lifelong patterns of magical thinking and social deficits, differentiating them from primary psychotic disorders, and managing patients with clear boundaries without inappropriately assuming a lack of decision-making capacity.
Estimated Time:2m 0s
Question 26Question →

Match each clinical vignette describing a medication-specific complication, adverse effect, or pharmacokinetic requirement to the most likely offending psychotropic agent used in the context of bipolar disorder.

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Items

A 28-year-old woman treated for bipolar I disorder presents with amenorrhea and bilateral galactorrhea. Laboratory evaluation reveals a negative serum beta-hCG and an elevated serum prolactin level.
A 45-year-old man on maintenance pharmacotherapy for bipolar disorder is found to have a serum sodium of 124 mEq/L (normal: 135-145) on routine lab monitoring. He is clinically euvolemic, and his urine osmolality is elevated.
A 32-year-old man is prescribed a second-generation antipsychotic for acute bipolar depression. To ensure adequate systemic absorption and therapeutic efficacy, the physician instructs him to take the medication with a meal of at least 350 calories.
A 50-year-old man on long-term maintenance therapy complains of excessive thirst and urinating 6 to 8 liters per day. His urine specific gravity is low, and his symptoms do not improve after a period of water deprivation.
A 24-year-old woman with a history of recurrent severe depression and a first-degree relative with bipolar disorder is prescribed a selective serotonin reuptake inhibitor. Two weeks later, she requires hospitalization for severe agitation, pressured speech, and a decreased need for sleep.

Matches

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Answer

The correct matches are: Galactorrhea and amenorrhea with Risperidone; Euvolemic hyponatremia with Carbamazepine; Required administration with a 350-calorie meal with Lurasidone; Nephrogenic diabetes insipidus with Lithium carbonate; and Antidepressant-induced manic switch with Fluoxetine.
Each medication utilized in bipolar disorder management has a distinct profile. Risperidone is highly associated with hyperprolactinemia. Carbamazepine causes SIADH (hyponatremia). Lurasidone necessitates administration with significant food (>350 calories) for absorption. Lithium causes nephrogenic diabetes insipidus by antagonizing ADH. Fluoxetine, an SSRI, can induce an acute manic episode if given as monotherapy to a patient with bipolar disorder.

Step-by-Step Solution

1
Analyze the endocrine/reproductive vignette.
Identified hyperprolactinemia.
Among the options, Risperidone is the antipsychotic most strongly associated with tuberoinfundibular dopamine blockade and subsequent elevated prolactin.
2
Analyze the electrolyte abnormality vignette.
Identified euvolemic hyponatremia consistent with SIADH.
Carbamazepine frequently causes SIADH, requiring routine serum sodium monitoring.
3
Analyze the pharmacokinetic vignette.
Identified the specific caloric intake requirement for absorption.
Lurasidone specifically requires a minimum 350-calorie meal for adequate bioavailability; taking it on an empty stomach drastically reduces its efficacy.
4
Analyze the renal/urinary vignette.
Identified nephrogenic diabetes insipidus.
Lithium carbonate is a classic cause of acquired nephrogenic DI due to its interference with ADH action at the collecting duct, leading to massive polyuria and polydipsia.
5
Analyze the psychiatric complication vignette.
Identified an antidepressant-induced manic switch.
Fluoxetine, a selective serotonin reuptake inhibitor, should not be used as monotherapy for depression in patients with a history of or high risk for bipolar disorder due to the risk of precipitating mania.

Key Concept

Pharmacotherapy for Bipolar Disorder: Specific Adverse Effects and Administration Requirements
Question 27Question →

Evaluate the clinical scenarios describing older adult patients presenting with progressive cognitive or behavioral changes. Match each distinct clinical presentation with its definitive diagnostic finding or most likely underlying pathophysiological mechanism.

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Items

A 67-year-old man is hospitalized for a 2-month history of rapidly progressing profound dementia, gait ataxia, and sudden jerky movements of his upper extremities when startled.
A 76-year-old nursing home resident develops severe lead-pipe rigidity and confusion shortly after receiving haloperidol for agitation. History includes fluctuating cognition and well-formed visual hallucinations.
A 59-year-old woman exhibits a 1-year history of worsening apathy, socially inappropriate comments, and a new compulsion to consume exclusively sweet foods, with relatively preserved memory.
A 71-year-old man exhibits a step-wise worsening of executive function over two years. Examination reveals asymmetric hyperreflexia, extensor plantar responses, and prominent emotional lability.
A 78-year-old woman presents with insidious, progressive short-term memory impairment over 3 years. She recently got lost driving in her own neighborhood but maintains appropriate social graces.

Matches

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Answer

Properly linking each clinical presentation to its pathophysiological mechanism requires recognizing the distinguishing features of the major neurocognitive disorders: rapid decline and myoclonus (CJD), neuroleptic sensitivity and hallucinations (DLB), personality changes (FTD), step-wise decline (Vascular), and insidious memory loss (Alzheimer).
Accurate matching requires recognizing the triad of rapid decline, ataxia, and myoclonus for CJD (14-3-3 protein, periodic sharp waves); early visual hallucinations, fluctuating cognition, and severe neuroleptic sensitivity for DLB (alpha-synuclein inclusions); early profound personality and dietary changes for FTD (Tau/TDP-43 aggregates); step-wise progression with focal signs for Vascular dementia (lacunar infarcts); and classic insidious short-term memory loss for Alzheimer disease (amyloid plaques and neurofibrillary tangles).

Step-by-Step Solution

1
Analyze each clinical vignette to identify the primary distinguishing symptoms and symptom onset pattern.
Identified rapid onset with myoclonus (CJD), antipsychotic sensitivity with hallucinations (DLB), behavioral/personality changes (FTD), step-wise decline with focal signs (Vascular), and slow progressive memory loss (Alzheimer).
Differentiation of neurocognitive disorders relies heavily on the temporal profile of decline and core clinical features present early in the disease course.
2
Correlate each established clinical diagnosis with its definitive molecular or imaging hallmark.
Matched CJD to CSF 14-3-3/EEG, DLB to alpha-synuclein, FTD to Tau/TDP-43, Vascular to lacunar infarcts, and Alzheimer to amyloid/tau plaques.
USMLE Step 2 CK frequently tests the ability to connect clinical presentations directly to underlying pathology and diagnostic workup results.

Key Concept

Differential diagnosis and pathophysiological mechanisms of major neurocognitive disorders.
Question 28Question →

A 3131-year-old man presents via telehealth for an initial psychiatric evaluation. He reports a 77-week history of persistent low mood, extreme lethargy, and a 66-kg (1313-lb) weight gain. He sleeps up to 1515 hours a day and describes his limbs as feeling 'unnaturally heavy.' For the past 22 weeks, he has also been hearing a distinct, critical voice telling him he is 'toxic and contagious' whenever he is alone in his room. Upon detailed psychiatric history taking, he reveals that 33 years ago, he was hospitalized for a 1010-day period during which he believed he was a divine messenger, slept only 11 hour per night, and paced the streets preaching. He was stabilized and discharged but stopped his prescribed medications shortly afterward. He recently began taking a high-dose over-the-counter St. John's wort supplement to improve his mood, but it has provided no relief. A recent primary care blood panel shows a thyroid-stimulating hormone (TSH) level of 2.12.1 mU/L (normal: 0.50.5-5.05.0) and a free thyroxine (T4) level of 1.11.1 ng/dL (normal: 0.80.8-1.81.8). Which of the following is the most appropriate next step in the management of this patient?

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Answer: Discontinue St. John's wort and initiate quetiapine

Answer

The most appropriate next step is to discontinue St. John's wort and initiate quetiapine.
The patient is presenting with a major depressive episode characterized by atypical features (hypersomnia, hyperphagia, leaden paralysis) and psychotic features (auditory hallucinations). Crucially, his history of a 1010-day hospitalization for grandiosity and decreased sleep confirms a diagnosis of Bipolar I Disorder. The most appropriate treatment for acute bipolar depression with psychotic features is an atypical antipsychotic that has demonstrated efficacy in bipolar depression, such as quetiapine or lurasidone. Quetiapine provides both mood-stabilizing effects for the bipolar depression and dopamine antagonism to treat the active psychosis. Additionally, the patient's over-the-counter St. John's wort should be discontinued due to lack of efficacy and a high risk of dangerous pharmacokinetic interactions (it is a potent CYP3A4 inducer and serotonergic agent).

Step-by-Step Solution

1
Analyze the current clinical presentation.
The patient presents with an acute major depressive episode characterized by atypical features (hypersomnia, weight gain, leaden paralysis) and mood-congruent psychotic features (auditory hallucinations for 22 weeks).
Identifying the current symptom cluster dictates the immediate therapeutic targets.
2
Evaluate the past psychiatric and medical history.
A previous hospitalization for a 1010-day episode of severe grandiosity, lack of sleep, and impaired functioning defines a prior manic episode. The thyroid panel is normal.
A history of mania changes the diagnosis from Major Depressive Disorder to Bipolar I Disorder, fundamentally altering the pharmacologic algorithm and ruling out unipolar depression and organic causes.
3
Determine the optimal pharmacotherapy while avoiding drug interactions.
St. John's wort must be discontinued due to inefficacy and interaction risks. Quetiapine is selected as it is approved for bipolar depression and provides D2 blockade for his psychotic features.
Monotherapy with traditional antidepressants must be avoided in bipolar depression. An atypical antipsychotic covers both the mood and psychotic symptoms safely.

Key Concept

Bipolar I Disorder, Current Episode Depressed with Psychotic and Atypical Features
Estimated Time:1m 30s
Question 29Question →

A 42-year-old man is brought to the emergency department by police due to erratic behavior in public. He is pacing the evaluation room, speaking loudly, and appears acutely agitated. He has not yet committed any acts of physical violence but is becoming increasingly uncooperative and hostile. Arrange the following interventions in the standard stepwise order for managing this acutely agitated patient, from the initial, least restrictive measure to the final, most restrictive measure.

Drag items to arrange them in the correct order

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Answer

The correct sequence from least to most restrictive is: Attempt verbal de-escalation techniques, then Offer voluntary oral psychotropic medication, then Administer involuntary intramuscular medication, and finally Apply physical restraints.
Ethical and legal standards mandate using the least restrictive alternative when managing an agitated patient. The clinical sequence must begin with verbal interventions (de-escalation). If unsuccessful, the patient should be offered voluntary oral medications. If the patient refuses and the risk of imminent harm remains high, involuntary chemical restraints (intramuscular medications) are utilized. Physical restraints are the most restrictive option and are strictly reserved as a last resort when the patient is an immediate, uncontrollable danger to themselves or others and alternative measures are inadequate.

Step-by-Step Solution

1
Identify the primary guiding principle for managing an agitated patient in an emergency setting.
The core legal and ethical principle is to use the least restrictive means possible.
This respects the patient's autonomy and physical integrity while ensuring the safety of the patient and the staff.
2
Determine the first line of intervention based on the least restrictive principle.
Verbal de-escalation techniques should be used first.
Verbal interventions are non-invasive and allow the patient an opportunity to voluntarily calm down and participate in their care.
3
Determine the next step if verbal techniques are insufficient.
Offer voluntary oral medications.
Oral medications provide necessary pharmacological assistance but still require the patient's cooperation, thus maintaining a degree of autonomy.
4
Establish the sequence for involuntary interventions if the patient escalates into an imminent threat.
Chemical restraints (intramuscular medications) should be used before physical restraints.
Chemical restraints are generally considered less restrictive and have lower risks of physical trauma compared to physical restraints, making physical restraints the ultimate last resort.

Key Concept

The management of acute agitation follows a legal and ethical stepwise approach, prioritizing the least restrictive interventions first (verbal de-escalation, followed by voluntary oral medication) before escalating to more restrictive measures (involuntary intramuscular medication, and finally physical restraints).
Question 30Question →

Match each of the following patient clinical vignettes with the most likely personality disorder diagnosis.

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Items

During a routine medical evaluation, a 42-year-old accountant repeatedly questions the clinic staff about how his medical records will be secured. He firmly believes his wife is unfaithful despite her constant reassurances and a lack of evidence. He refuses to disclose basic social history to the physician, stating that the information will 'undoubtedly be used against him' by his employer.
An elegantly but flamboyantly dressed 31-year-old actress presents to a new primary care physician and immediately attempts to hug the doctor. She describes a recent minor disagreement with a colleague as a 'catastrophic betrayal that destroyed her soul,' yet her explanation of the event is vague and lacks specific details.
A court-ordered psychiatric evaluation is performed on a 28-year-old man who was recently convicted of defrauding his business partners. He expresses absolutely no remorse, stating they were 'foolish enough to be taken advantage of.' His past medical records reveal a childhood history of frequent truancy and animal cruelty.
A 35-year-old administrative assistant seeks help for chronic anxiety. She remains in a highly critical and emotionally abusive marriage, stating she is utterly incapable of managing life on her own. At work, she frequently calls her mother to decide what she should wear and volunteers for demeaning tasks just to ensure her coworkers will not abandon her.

Matches

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Answer

The correct matches align the guarded, suspicious accountant with Paranoid Personality Disorder; the attention-seeking, dramatic actress with Histrionic Personality Disorder; the remorseless, deceitful man with Antisocial Personality Disorder; and the submissive, excessively clinging administrative assistant with Dependent Personality Disorder.
Each vignette provides classic diagnostic criteria for specific personality disorders as outlined in the DSM-5. The first patient matches Paranoid Personality Disorder (Cluster A) due to pervasive distrust. The second matches Histrionic Personality Disorder (Cluster B) due to excessive attention-seeking and emotionality. The third matches Antisocial Personality Disorder (Cluster B) due to a history of conduct disorder and lack of remorse for exploiting others. The fourth matches Dependent Personality Disorder (Cluster C) due to an excessive need to be cared for and submissive behavior.

Step-by-Step Solution

1
Analyze the first vignette to identify core maladaptive traits.
The patient shows pervasive distrust, suspicion of infidelity without evidence, and fear that information will be used against him maliciously.
Identifying these specific paranoid traits differentiates this from other Cluster A disorders like schizoid (which involves social detachment) or schizotypal (which involves magical thinking).
2
Evaluate the second vignette for predominant behavioral patterns.
The patient exhibits excessive emotionality, attention-seeking behavior, inappropriate familiarity, and impressionistic speech lacking detail.
These are the diagnostic criteria for Histrionic Personality Disorder, differentiating it from Borderline Personality Disorder, which would typically feature chronic feelings of emptiness, self-harm, or intense anger.
3
Assess the third vignette focusing on interpersonal conduct and history.
The patient demonstrates exploitation of others, lack of remorse, and a childhood history of conduct disorder.
A history of conduct disorder before age 15 and current disregard for the rights of others are required for the diagnosis of Antisocial Personality Disorder, distinguishing it from Narcissistic Personality Disorder, which centers on grandiosity rather than pervasive law-breaking or physical aggression.
4
Review the fourth vignette for defining interpersonal dependencies.
The patient shows an excessive need to be taken care of, relies on others for minor decisions, and tolerates abuse or volunteers for unpleasant tasks to maintain relationships.
This submissive and clinging behavior is the core of Dependent Personality Disorder, which can be distinguished from Avoidant Personality Disorder, where the primary driver is fear of rejection and feelings of inadequacy rather than fear of losing support.

Key Concept

The ability to distinguish between different personality disorders based on core pervasive, maladaptive traits and behaviors across various interpersonal contexts.
Question 31Question →

Match the following psychiatric legal and ethical concepts with their most appropriate clinical scenario.

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Items

Duty to protect
Involuntary commitment
Substituted judgment
Emancipated minor status
Therapeutic privilege

Matches

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Answer

Duty to protect pairs with breaching confidentiality to warn an identifiable victim. Involuntary commitment pairs with admitting an actively suicidal patient against their will. Substituted judgment pairs with a surrogate making decisions based on the patient's past wishes. Emancipated minor status pairs with a married 16-year-old consenting to their own care. Therapeutic privilege pairs with temporarily withholding a diagnosis to prevent an immediate suicide attempt.
Each legal and ethical concept accurately aligns with the clinical scenario that demonstrates its application. The duty to protect involves warning identifiable targets of imminent harm. Involuntary commitment applies to patients who are a danger to themselves. Substituted judgment is utilized by surrogates acting on a patient's prior expressed wishes. Emancipation allows specific minors to legally consent to care. Therapeutic privilege permits withholding information only to prevent severe, immediate harm.

Step-by-Step Solution

1
Analyze each legal and ethical principle listed on the left.
Identify the core definitions for duty to protect, involuntary commitment, substituted judgment, emancipated minor, and therapeutic privilege.
Understanding the precise legal and ethical boundaries of each concept is required to match them with practical examples.
2
Evaluate the clinical scenarios on the right.
Determine the underlying legal or ethical doctrine that is being applied in each specific situation.
Clinical scenarios often describe the practical application of abstract legal principles.
3
Match the principles to their corresponding clinical situations.
Each abstract concept is paired with its real-world psychiatric emergency or ethical application.
This confirms a complete bidirectional understanding of psychiatric legal and ethical guidelines.

Key Concept

Psychiatric Legal and Ethical Guidelines
Question 32Question →

Match each psychotropic medication with its most characteristic adverse effect, specific monitoring requirement, or clinical contraindication.

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Items

Lamotrigine
Bupropion
Lithium
Clozapine

Matches

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Answer

Lamotrigine matches with severe cutaneous adverse reactions; Bupropion with contraindication in bulimia nervosa; Lithium with impaired renal concentrating ability; and Clozapine with absolute neutrophil count monitoring.
Each listed psychotropic medication has a classic and highly tested adverse effect profile. Lamotrigine requires very slow titration to avoid Stevens-Johnson syndrome. Bupropion lowers the seizure threshold and is specifically contraindicated in patients with eating disorders. Lithium frequently causes nephrogenic diabetes insipidus, presenting with polyuria and polydipsia. Clozapine requires strict ANC monitoring due to the known risk of potentially fatal agranulocytosis.

Step-by-Step Solution

1
Analyze Lamotrigine's primary adverse effect profile.
Identify that it requires slow titration to prevent life-threatening rashes like Stevens-Johnson syndrome.
This is a key clinical safety consideration when initiating Lamotrigine for bipolar disorder.
2
Recall the major contraindications for Bupropion.
Identify that it is contraindicated in bulimia nervosa and anorexia nervosa.
Electrolyte disturbances commonly seen in eating disorders compound Bupropion's known dose-dependent lowering of the seizure threshold.
3
Identify the primary renal toxicity associated with Lithium.
Match Lithium with polyuria, polydipsia, and nephrogenic diabetes insipidus.
Lithium antagonizes antidiuretic hormone action in the kidney, leading to an inability to concentrate urine.
4
Determine the required safety monitoring protocol for Clozapine.
Match Clozapine with absolute neutrophil count (ANC) monitoring.
Because Clozapine can cause potentially fatal agranulocytosis, strict hematologic monitoring is mandated.

Key Concept

Recognizing classic adverse effects, contraindications, and required monitoring for major psychotropic medications
Question 33Question →

A 28-year-old man is brought to the emergency department by police after he was found running through traffic, shouting that he is "being hunted by assassins." He is highly agitated, uncooperative, and combative. The patient has a history of major depressive disorder. Medical records indicate he takes citalopram. A friend who arrives at the ED reports the patient recently started taking an over-the-counter herbal supplement for mood enhancement and was also prescribed linezolid for a skin infection at an urgent care clinic two days ago. His temperature is 39.6∘C39.6^\circ\text{C} (103.3∘F103.3^\circ\text{F}), pulse is 134/min134/\text{min}, respirations are 24/min24/\text{min}, and blood pressure is 172/98 mm Hg172/98\text{ mm Hg}. Physical examination reveals severe diaphoresis and mydriasis. Neurological examination is notable for hyperreflexia and sustained bilateral ankle clonus. The patient is delirious, disoriented to time and place, and violently resists examination, screaming, "You're not touching me! I'm leaving!" as he attempts to climb off the stretcher. Which of the following is the most appropriate next step in the management of this patient?

Show answer & explanation

Answer: Administer intravenous lorazepam under emergency implied consent

Answer

Administer intravenous lorazepam under emergency implied consent
The correct answer involves recognizing both the psychiatric/medical emergency and the ethical doctrine required to manage it. This patient presents with the classic triad of Serotonin Syndrome (altered mental status, autonomic instability, and neuromuscular hyperactivity) triggered by the interaction of citalopram, linezolid (which has weak MAOI activity), and likely St. John's wort. Specifically, the presence of hyperreflexia and sustained ankle clonus distinguishes Serotonin Syndrome from Neuroleptic Malignant Syndrome (NMS), which typically presents with lead-pipe rigidity and hyporeflexia. The initial treatment for severe agitation and autonomic instability in Serotonin Syndrome is supportive care and intravenous benzodiazepines, such as lorazepam. Ethically, because the patient is delirious and lacks decision-making capacity in a life-threatening scenario, physicians are authorized to provide immediate, life-saving interventions under the principle of emergency implied consent, bypassing the immediate need for surrogate authorization.

Step-by-Step Solution

1
Diagnose the acute medical condition based on the clinical vignette.
The combination of citalopram (SSRI), linezolid (MAOI properties), and an herbal supplement (likely St. John's wort) has precipitated Serotonin Syndrome, characterized by altered mental status, autonomic instability, and neuromuscular hyperactivity (clonus/hyperreflexia).
Recognizing the toxidrome is required to select the correct pharmacological intervention.
2
Assess the patient's decision-making capacity and legal status.
The patient is actively delirious, disoriented, and experiencing psychotic symptoms; therefore, he lacks the capacity to refuse medical treatment.
Capacity must be determined before overriding a patient's refusal of care.
3
Determine the appropriate ethical and legal framework for treatment.
Because this is a life-threatening emergency (severe hyperthermia and autonomic instability) and the patient lacks capacity, the physician must act immediately under the doctrine of emergency implied consent.
Waiting for a surrogate or court order in a true emergency leads to preventable mortality.

Key Concept

Diagnosis of Serotonin Syndrome and the application of emergency implied consent in life-threatening psychiatric/medical emergencies.
Estimated Time:1m 30s
Question 34Question →

A 28-year-old woman comes to the clinic reporting progressive fatigue, mild shortness of breath on exertion, and tingling in her fingertips over the past two weeks. She has a long-standing history of binge-eating disorder characterized by eating large amounts of food with a sense of loss of control, without any compensatory purging behaviors. Three weeks ago, her psychiatrist initiated a new medication that is also indicated for migraine prophylaxis to help manage her binge-eating episodes and promote weight loss. Her body mass index (BMI) is 32.4 kg/m232.4 \text{ kg/m}^2. Her temperature is 37.0∘C37.0^\circ\text{C} (98.6∘F98.6^\circ\text{F}), pulse is 88/min88/\text{min}, blood pressure is 118/76 mm Hg118/76\text{ mm Hg}, and respirations are 18/min18/\text{min}.

Laboratory studies reveal the following:
TestResult
Serum sodium141 mEq/L141\text{ mEq/L}
Serum potassium3.8 mEq/L3.8\text{ mEq/L}
Serum chloride115 mEq/L115\text{ mEq/L}
Serum bicarbonate16 mEq/L16\text{ mEq/L}
Blood urea nitrogen14 mg/dL14\text{ mg/dL}
Serum creatinine0.9 mg/dL0.9\text{ mg/dL}
Arterial blood gas analysis on room air shows:
TestResult
pH7.317.31
PaCO232 mm Hg32\text{ mm Hg}
PaO295 mm Hg95\text{ mm Hg}

Which of the following best describes the acid-base disturbance in this patient resulting from her new psychiatric medication?

Show answer & explanation

Answer: Normal anion gap metabolic acidosis with appropriate respiratory compensation

Answer

Normal anion gap metabolic acidosis with appropriate respiratory compensation
The correct answer identifies a normal anion gap metabolic acidosis with appropriate respiratory compensation. The clinical vignette describes a patient with binge-eating disorder who was recently started on topiramate, an anticonvulsant frequently used off-label for weight reduction in binge-eating disorder and indicated for migraine prophylaxis. Topiramate inhibits carbonic anhydrase in the proximal renal tubule, leading to decreased bicarbonate reabsorption and a subsequent Type 2 renal tubular acidosis. This presents as a normal anion gap metabolic acidosis (hyperchloremic acidosis). The patient's anion gap is calculated as 141−(115+16)=10 mEq/L141 - (115 + 16) = 10 \text{ mEq/L}, which is within the normal limits of 8-12 mEq/L. To determine if the respiratory compensation is adequate, Winter's formula is applied: Expected PaCO2 = (1.5×16)+8±2=32±2 mm Hg(1.5 \times 16) + 8 \pm 2 = 32 \pm 2 \text{ mm Hg}. Because the measured PaCO2 is exactly 32 mm Hg32 \text{ mm Hg}, the patient has an appropriately compensated simple metabolic acidosis without any concurrent respiratory disorders.

Step-by-Step Solution

1
Identify the primary psychiatric medication and its associated adverse effects.
The patient with binge-eating disorder is taking topiramate (indicated for weight loss and migraine prophylaxis). A classic side effect of topiramate is paresthesias and a type 2 renal tubular acidosis due to carbonic anhydrase inhibition.
Understanding the pharmacotherapy for eating disorders is required to anticipate the physiologic complications presented in the laboratories.
2
Determine the primary acid-base disturbance and calculate the serum anion gap.
The pH is 7.31 (acidemia) and serum bicarbonate is 16 mEq/L, indicating a primary metabolic acidosis. The anion gap is 141 - (115 + 16) = 10 mEq/L, which is a normal anion gap.
Calculating the anion gap differentiates the cause of the metabolic acidosis. A normal anion gap confirms the topiramate-induced bicarbonate loss rather than an unmeasured anion accumulation.
3
Calculate the expected respiratory compensation using Winter's formula.
Expected PaCO2 = (1.5 × HCO3) + 8 ± 2. Substituting the values: (1.5 × 16) + 8 = 24 + 8 = 32 ± 2 mm Hg. The measured PaCO2 is 32 mm Hg.
Comparing the measured PaCO2 to the expected PaCO2 determines if a secondary respiratory acid-base disorder is present. Since they match perfectly, there is appropriate respiratory compensation.

Key Concept

Topiramate is a pharmacologic option for binge-eating disorder that can cause a normal anion gap metabolic acidosis (Type 2 RTA) due to carbonic anhydrase inhibition. Winter's formula [Expected PaCO2 = (1.5 × HCO3) + 8 ± 2] is used to verify appropriate respiratory compensation in metabolic acidosis.
Question 35Question →

A 50-year-old man is evaluated on the surgical ward on postoperative day 3 following an uncomplicated partial colectomy for recurrent diverticulitis. The cross-cover physician is called because the patient has become acutely disoriented, diaphoretic, and extremely agitated, stating that he sees spiders descending from the ceiling. Vital signs reveal a temperature of 38.5∘C38.5^\circ\mathrm{C} (101.3∘F101.3^\circ\mathrm{F}), blood pressure of 172/106 mmHg172/106\text{ mmHg}, pulse of 128/min128/\text{min}, and respiratory rate of 24/min24/\text{min}. Physical examination shows a coarse tremor of the extended hands. His surgical dressings are clean and intact, and the abdomen is nondistended with mild expected incisional tenderness. A review of his preoperative social history indicates he consumes one pint of whiskey daily. Which of the following is the most appropriate next step in management?

Show answer & explanation

Answer: Intravenous diazepam

Answer

The most appropriate next step in management is the administration of intravenous diazepam.
The patient is experiencing severe alcohol withdrawal, specifically delirium tremens, which typically begins 48 to 96 hours after the last drink. The hallmark features include autonomic instability (tachycardia, hypertension, fever), altered mental status, and visual hallucinations (often of insects or animals). Benzodiazepines, such as intravenous diazepam, are the gold standard treatment. They enhance the inhibitory effect of GABA, compensating for the sudden lack of alcohol and preventing progression to seizures and cardiovascular collapse.

Step-by-Step Solution

1
Analyze the patient's presentation and timeline.
The patient developed fever, tachycardia, hypertension, diaphoresis, severe agitation, hallucinations, and tremor 3 days after hospital admission.
Establishing the timeline helps narrow the differential diagnosis for postoperative fever and altered mental status.
2
Correlate symptoms with the patient's history.
The patient consumes a significant amount of alcohol daily, and his symptoms align perfectly with the 48-to-96-hour window typical for delirium tremens.
Identifying the underlying etiology prevents misdiagnosing the condition as a primary surgical complication or primary psychotic disorder.
3
Select the most appropriate pharmacotherapy.
Intravenous diazepam (or another benzodiazepine) is chosen.
Benzodiazepines stimulate GABA receptors, reversing the central nervous system hyperactivity caused by alcohol withdrawal and preventing progression to seizures.

Key Concept

The diagnosis of delirium tremens in a postoperative setting and its appropriate management with benzodiazepines.
Question 36Question →

Paramedics rush a 3434-year-old woman to the emergency department. Her husband discovered her unresponsive in their bedroom alongside an empty bottle of her recently prescribed antidepressant. According to the husband, she suffers from major depressive disorder and has been enduring a severe relapse over the past month.

Upon arrival, her temperature is 37.8∘C37.8^\circ\text{C} (100.0∘F100.0^\circ\text{F}), blood pressure is 90/60 mmHg90/60\text{ mmHg}, pulse is 128/min128/\text{min}, and respirations are 6/min6/\text{min}. Physical examination reveals dilated, minimally reactive pupils, completely dry mucous membranes, and absent bowel sounds. She is deeply obtunded and withdraws only to painful stimuli. An electrocardiogram demonstrates sinus tachycardia with a QRS duration of 150 ms150\text{ ms}.

As the medical team prepares for immediate endotracheal intubation, the husband produces a legally valid, notarized advance directive that the patient completed one year ago. The document explicitly mandates: 'I refuse mechanical ventilation and cardiopulmonary resuscitation under any circumstances.' The husband pleads, 'She has been expressing a desire to end her life for weeks. She meant every word in this document. You must respect her legal rights and not put her on a breathing machine.'

Which of the following is the most appropriate next step in management?

Show answer & explanation

Answer: Intubate the patient and administer intravenous sodium bicarbonate

Answer

Intubate the patient and administer intravenous sodium bicarbonate
This patient presents with respiratory failure and signs of severe tricyclic antidepressant (TCA) toxicity, indicated by the anticholinergic toxidrome (dilated pupils, dry mucous membranes, absent bowel sounds) and a widened QRS complex (>100 ms100\text{ ms}). The appropriate medical management is securing the airway via endotracheal intubation and administering intravenous sodium bicarbonate to overcome sodium channel blockade and prevent fatal arrhythmias.

Ethically, the husband is requesting that the physician withhold life-saving care based on the patient's advance directive. However, in the setting of an intentional suicide attempt, advance directives refusing life-sustaining interventions are legally and ethically suspended. A suicide attempt represents an acute psychiatric emergency, and the patient is presumed to have impaired decision-making capacity due to an underlying mental illness (e.g., severe depression). Therefore, the physician has an obligation to provide life-saving, reversible treatments to preserve the patient's life. Emergency interventions should proceed immediately and must not be delayed by seeking court orders, ethics consultations, or attempting to inappropriately compromise on the level of life-saving care.

Step-by-Step Solution

1
Diagnose the medical emergency.
The patient is experiencing a tricyclic antidepressant (TCA) overdose (anticholinergic toxidrome, wide QRS > 100 ms) complicated by respiratory failure (RR 6/min).
Recognizing the toxidrome dictates the need for airway protection and sodium bicarbonate to prevent fatal ventricular arrhythmias.
2
Evaluate the ethical validity of the advance directive.
The advance directive is ethically and legally suspended in this specific context.
The patient's life-threatening condition is the direct result of a suicide attempt, which legally implies an acute impairment of decision-making capacity due to a psychiatric crisis.
3
Determine the next best step in management.
Proceed immediately with emergency intubation and sodium bicarbonate administration.
Physicians have an obligation to provide life-saving, reversible treatments during a suicide attempt, overriding both the surrogate's demands and the advance directive without awaiting a court order.

Key Concept

Advance directives refusing life-sustaining interventions are generally suspended during an active suicide attempt; the patient is presumed to lack capacity, obligating the physician to provide emergency, life-saving medical and psychiatric care.
Estimated Time:1m 30s
Question 37Question →

For each of the following pediatric patients presenting with behavioral or neurodevelopmental concerns, identify the most appropriate next step in evaluation or management.

Click a left item, then click its matching right item

Items

A 3-year-old female presents with regression of previously acquired spoken words and the new onset of repetitive hand-wringing movements. Her head circumference growth has noticeably decelerated over the past eight months. Early developmental milestones were met on time.
A 7-year-old male is failing second grade due to severe inattention and impulsivity. Standardized rating scales indicate pervasive symptoms across settings. A rigorous 6-month trial of behavioral classroom accommodations and parent training has yielded minimal improvement.
A 6-year-old male frequently loses his temper, argues with adults, and actively defies rules at home and school. He has never initiated physical fights, stolen, or destroyed property. The family is seeking initial intervention guidance.
A 10-year-old male experiences frequent, involuntary throat clearing and rapid facial grimacing. These symptoms have been present for 14 months, wax and wane in severity, and cause significant distress at school. He is currently treatment-naive.

Matches

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Answer

The correct matches are: the 3-year-old with milestone regression requires MECP2 genetic analysis; the 7-year-old with refractory ADHD requires a central nervous system stimulant; the 6-year-old with Oppositional Defiant Disorder requires parent management training; and the 10-year-old with Tourette syndrome requires Comprehensive behavioral intervention for tics (CBIT).
Each patient presentation maps to a distinct, evidence-based next step in management based on diagnostic criteria and treatment algorithms. Rett syndrome requires genetic confirmation. Refractory school-aged ADHD requires stimulants. ODD relies heavily on parent management training as a primary intervention. Tourette syndrome is initially managed with specialized behavioral therapy (CBIT) before escalating to pharmacotherapy.

Step-by-Step Solution

1
Analyze the 3-year-old female's presentation.
Identify normal development followed by regression, hand-wringing, and microcephaly.
Recognizing this triad establishes a clinical diagnosis of Rett syndrome, which dictates genetic testing as the confirmatory next step.
2
Evaluate the 7-year-old male failing second grade.
Identify ADHD that has failed initial conservative behavioral therapy.
Understanding the treatment algorithm for school-aged ADHD confirms that when behavioral interventions are insufficient, stimulant medications are indicated.
3
Assess the 6-year-old male with defiant behavior.
Differentiate ODD from Conduct Disorder based on the absence of physical violence or property destruction.
Properly classifying ODD directs the clinician toward parent management training rather than psychopharmacology as the first-line intervention.
4
Examine the 10-year-old male with motor and vocal movements.
Diagnose Tourette syndrome due to the presence of both motor and vocal tics for over a year.
Establishing this diagnosis guides the selection of targeted behavioral therapies (like CBIT) before initiating medications such as alpha-2 agonists or antipsychotics.

Key Concept

Diagnosis and stepwise management of pediatric neurodevelopmental and disruptive behavioral disorders.
Question 38Question →

Match each patient's clinical presentation with the most likely substance-related toxidrome or diagnosis.

Click a left item, then click its matching right item

Items

Prolonged and severe delirium, extreme combativeness, myoclonus, and autonomic hyperactivity lasting for over 48 hours
Transient euphoria, lethargy, ataxia, depressed reflexes, and an erythematous perioral rash
Acute onset of severe chest pain, prominent pupillary dilation, diaphoresis, and a blood pressure of 185/115 mm Hg
Increased sociability, euphoria, bruxism, hyperthermia, and acute hyponatremia
Tremors, marked anxiety, perceptual disturbances, and a generalized tonic-clonic seizure following abrupt medication cessation

Matches

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Answer

Matching these distinct clinical presentations to their corresponding substance-related diagnosis relies on identifying pathognomonic or highly characteristic clinical features, such as prolonged delirium for synthetic cathinones, a perioral rash for inhalants, and hyponatremia for MDMA.
Each specific clinical vignette contains hallmark signs pointing to a distinct toxidrome. Synthetic cathinones cause an uncharacteristically prolonged delirium; inhalants cause a characteristic perioral rash; cocaine causes intense vasospasm and ischemic chest pain; MDMA induces bruxism and hyponatremia; and abrupt benzodiazepine cessation results in severe withdrawal seizures.

Step-by-Step Solution

1
Evaluate the first presentation for distinguishing features.
The prolonged duration (>48 hours) of severe agitation and combativeness is the key finding.
This exceptionally long duration of delirium uniquely points to synthetic cathinone intoxication over typical short-acting stimulants.
2
Analyze the second presentation focusing on dermatologic findings.
The combination of transient depressant effects and an erythematous perioral rash is identified.
The 'glue sniffer's rash' is a highly specific physical exam finding for chronic inhalant abuse.
3
Assess the third presentation involving cardiovascular pathology.
The acute chest pain accompanied by extreme hypertension and mydriasis is isolated.
Cocaine-induced coronary vasospasm is a classic and dangerous cause of acute chest pain in the setting of extreme sympathetic overactivation.
4
Examine the fourth presentation for unique metabolic and behavioral signs.
Increased sociability, bruxism, and hyponatremia are grouped together.
MDMA classically causes bruxism and is well known to cause potentially life-threatening hyponatremia.
5
Review the fifth presentation regarding medication cessation.
The onset of tremors, anxiety, and a generalized tonic-clonic seizure is noted.
Abrupt discontinuation of central nervous system depressants, specifically benzodiazepines or alcohol, leads to rebound excitation and withdrawal seizures.

Key Concept

Distinguishing characteristics of various substance intoxications and withdrawals based on unique physical exam and metabolic findings.
Question 39Question →

Match the following brief clinical scenarios detailing symptom onset, duration, and core clinical features to their most appropriate DSM-5 psychiatric diagnosis.

Click a left item, then click its matching right item

Items

A patient develops intrusive flashbacks, negative mood, and severe hyperarousal 10 days after a violent physical assault; all symptoms resolve completely within three weeks of the event.
A patient experiences pervasive, uncontrollable apprehension about job security, household chores, and their children's safety on most days for the past 9 months, accompanied by muscle tension and fatigue.
A patient avoids crowded grocery stores, riding the subway, and attending outdoor concerts for 7 months due to persistent fears that escape would be difficult if they were to suddenly develop panic-like symptoms.
A patient has experienced four spontaneous surges of intense terror peaking within minutes over the past year, and now constantly modifies daily behaviors to prevent future surges from occurring.

Matches

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Answer

Scenario 1 matches Acute stress disorder; Scenario 2 matches Generalized anxiety disorder; Scenario 3 matches Agoraphobia; Scenario 4 matches Panic disorder.
Each clinical scenario maps directly to the DSM-5 diagnostic criteria for anxiety and trauma-related disorders based primarily on duration thresholds (e.g., <1 month for ASD, >6 months for GAD and Agoraphobia) and the specific cognitive focus of the anxiety (unexpected attacks for Panic Disorder).

Step-by-Step Solution

1
Analyze the trauma-related timeline in the first scenario.
The symptoms occurred after a severe trauma but lasted less than 1 month, pointing directly to acute stress disorder rather than PTSD.
Duration of symptoms is the key differentiator between acute stress disorder (3 days to 1 month) and PTSD (>1 month).
2
Evaluate the nature and chronicity of the anxiety in the second scenario.
The patient worries about multiple disparate topics (finances, family, chores) for over 6 months with somatic symptoms, which meets criteria for generalized anxiety disorder.
GAD requires excessive worry occurring more days than not for at least 6 months, concerning a number of events or activities.
3
Identify the trigger and avoidance behavior in the third scenario.
Avoidance of crowds, public transport, and open spaces out of fear of being unable to escape firmly establishes a diagnosis of agoraphobia.
Agoraphobia requires fear/avoidance of 2 or more of 5 specific situations (using public transport, being in open spaces, being in enclosed places, standing in line/being in a crowd, being outside of the home alone).
4
Assess the features of the distinct episodes of terror in the fourth scenario.
Recurrent unexpected panic attacks leading to persistent behavioral changes align with panic disorder.
Panic disorder requires unexpected attacks followed by at least 1 month of persistent concern about additional attacks or a significant maladaptive change in behavior.

Key Concept

Differential diagnosis of anxiety and trauma-related disorders relies heavily on symptom duration (e.g., ASD vs. PTSD) and the specific focus of the core fear (e.g., unexpected surges vs. difficult escape vs. generalized worry).
Question 40Question →

A 45-year-old woman is brought to the emergency department by her husband due to a severe, throbbing headache, blurred vision, and chest palpitations that began 45 minutes ago. She has a 10-year history of major depressive disorder that was poorly responsive to multiple trials of selective serotonin reuptake inhibitors and serotonin-norepinephrine reuptake inhibitors. Six weeks ago, her psychiatrist started her on tranylcypromine. Vital signs are temperature 37.2°C (99.0°F), blood pressure 228/132 mm Hg, pulse 118/min, and respirations 20/min. Physical examination reveals profuse diaphoresis, facial flushing, and pupillary dilation. Neurological examination shows normal muscle tone, 2+ deep tendon reflexes symmetrically, and absent clonus. Mental status examination reveals an anxious woman who is fully oriented to person, place, and time. Her husband mentions they were celebrating their anniversary at a restaurant earlier this evening, where they shared a large platter of aged cheeses and cured meats. Which of the following is the most appropriate initial pharmacological intervention for this patient's current condition?

Show answer & explanation

Answer: Intravenous phentolamine

Answer

The most appropriate initial intervention is intravenous phentolamine.
The correct answer is intravenous phentolamine. This patient is presenting with a tyramine-induced hypertensive crisis, a classic and life-threatening complication of monoamine oxidase inhibitors (MAOIs) such as tranylcypromine. MAOIs irreversibly inhibit monoamine oxidase, the enzyme primarily responsible for breaking down dietary tyramine. When a patient on an MAOI consumes tyramine-rich foods (such as aged cheeses and cured meats), the tyramine enters the systemic circulation and acts as an indirect sympathomimetic. It displaces massive amounts of norepinephrine from presynaptic nerve terminals, leading to severe alpha-1 receptor-mediated vasoconstriction. This presents as a hypertensive emergency, often accompanied by severe headache, palpitations, diaphoresis, and flushing. The physical exam is crucial here: the absence of hyperreflexia, clonus, and lead-pipe rigidity distinguishes this condition from Serotonin Syndrome and Neuroleptic Malignant Syndrome. The most appropriate and life-saving initial treatment is a rapidly acting alpha-adrenergic antagonist, such as phentolamine, to counteract the profound vasoconstriction and lower the blood pressure.

Step-by-Step Solution

1
Analyze the patient's medication history and recent dietary intake.
The patient is taking tranylcypromine, a monoamine oxidase inhibitor (MAOI), and recently consumed aged cheeses and cured meats, which are rich in tyramine.
MAOIs inhibit the breakdown of tyramine in the gastrointestinal tract, leading to systemic tyramine absorption.
2
Evaluate the clinical presentation and physical examination findings.
The patient has extreme hypertension (228/132 mm Hg), sympathetic overactivity (diaphoresis, tachycardia, mydriasis), but normal neurological tone and reflexes without clonus.
These findings precisely match a tyramine-induced hypertensive crisis and rule out Serotonin Syndrome (which features hyperreflexia/clonus) and Neuroleptic Malignant Syndrome (which features severe rigidity).
3
Determine the pathophysiological mechanism of the crisis.
Systemic tyramine acts as an indirect sympathomimetic, displacing massive amounts of norepinephrine from presynaptic vesicles and causing severe alpha-1 mediated vasoconstriction.
Understanding the receptor profile involved dictates the pharmacological antidote.
4
Select the appropriate targeted pharmacological therapy.
Intravenous phentolamine (a short-acting, non-selective alpha-adrenergic antagonist) is selected to immediately reverse the severe alpha-mediated vasoconstriction.
Alpha-blockade is the definitive treatment; beta-blockers must be avoided to prevent unopposed alpha agonism.

Key Concept

Tyramine-induced hypertensive crisis in patients taking MAOIs is caused by massive norepinephrine release and is treated with alpha-adrenergic antagonists like phentolamine.
Estimated Time:1m 30s
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