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Question 761Question →

Match the following brief clinical presentations with their most appropriate DSM-5 psychiatric diagnosis.

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Items

A patient experiences 7 months of excessive, uncontrollable worry about various aspects of daily life, accompanied by muscle tension and fatigue.
A patient develops intrusive memories, negative mood, avoidance, and hyperarousal exactly 2 weeks after surviving a severe motor vehicle collision.
A patient experiences recurrent, unexpected episodes of intense fear reaching a peak within minutes, followed by persistent concern about having future episodes.
A patient actively avoids speaking in meetings or eating in public due to a persistent, intense fear of being negatively evaluated by others for the past 8 months.

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Answer

Match the clinical presentations to their respective diagnoses based on core symptoms and timeline criteria: 7 months of excessive worry aligns with Generalized anxiety disorder; 2 weeks of post-trauma symptoms aligns with Acute stress disorder; unexpected panic attacks with anticipatory anxiety aligns with Panic disorder; and 8 months of fear of scrutiny aligns with Social anxiety disorder.
Each clinical vignette provides specific symptom clusters and duration timelines that uniquely satisfy the DSM-5 diagnostic criteria for only one of the provided disorders. The key differentiators are the nature of the anxiety (worry vs. panic vs. social evaluation) and the exact duration of symptoms.

Step-by-Step Solution

1
Analyze the core symptom for each presentation.
Presentation 1 features excessive worry. Presentation 2 features post-trauma symptoms. Presentation 3 features unexpected panic attacks. Presentation 4 features fear of social scrutiny.
Identifying the primary symptom cluster isolates the specific class of psychiatric disorder (e.g., anxiety vs. trauma-related).
2
Evaluate the symptom duration for each presentation against DSM-5 criteria.
Presentation 1 is >6 months (meets GAD criteria). Presentation 2 is <1 month (meets acute stress disorder, not PTSD). Presentation 3 involves anticipatory concern after attacks (meets panic disorder). Presentation 4 is >6 months (meets SAD criteria).
Duration thresholds are essential in psychiatry to distinguish between normal acute reactions, temporary disorders, and chronic conditions.

Key Concept

Diagnosis of anxiety and trauma-related disorders requires identifying the core fear/symptom and accurately applying DSM-5 timeline criteria.
Question 762Question →

For each of the following patient vignettes, select the most accurate personality disorder diagnosis.

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Items

A 29-year-old software developer works night shifts to avoid coworkers. He spends weekends alone, expresses no desire for romantic involvement, and appears indifferent to the praise he receives for his coding efficiency.
A 22-year-old college student constantly texts her sister for advice on everyday decisions. She recently tolerated an abusive relationship because she felt unable to survive alone and rapidly sought a new partner after breaking up.
A 40-year-old surgical fellow meticulously re-sterilizes instruments, causing schedule delays. He refuses to delegate tasks to interns because they cannot meet his exact standards and spends free time organizing textbooks instead of relaxing.
A 26-year-old barista presents with superficial forearm lacerations after her therapist announced a vacation. She alternates between idealizing the triage nurse and verbally attacking the physician, describing feelings of chronic emptiness.

Matches

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Answer

The vignettes correctly match with Schizoid, Dependent, Obsessive-Compulsive, and Borderline Personality Disorders, respectively.
Each vignette provides classic diagnostic criteria for specific personality disorders. Vignette 1 describes the solitary nature and indifference of schizoid personality disorder. Vignette 2 highlights the clinging behavior and intense fear of separation seen in dependent personality disorder. Vignette 3 illustrates the ego-syntonic perfectionism and rigidity of obsessive-compulsive personality disorder. Vignette 4 demonstrates the unstable relationships, fear of abandonment, and self-harm typical of borderline personality disorder.

Step-by-Step Solution

1
Analyze the first vignette for core interpersonal traits.
The patient shows profound social detachment, preference for solitary activities, and indifference to others' opinions.
Identifying the genuine lack of desire for relationships points away from avoidant personality disorder and confirms schizoid traits.
2
Examine the second vignette focusing on relational dependency.
The patient displays an excessive need to be cared for, indecisiveness without reassurance, and intense fear of being alone.
These deeply ingrained dependent and clinging behaviors confirm a diagnosis of dependent personality disorder.
3
Evaluate the third vignette regarding work habits, control, and flexibility.
The patient is preoccupied with perfectionism, refuses to delegate, and sacrifices leisure for extreme organization.
This rigidity and need for control characterize obsessive-compulsive personality disorder, differentiating it from true obsessive-compulsive disorder (OCD) which involves ego-dystonic obsessions.
4
Assess the fourth vignette for emotional regulation and relationship stability.
The patient exhibits self-harm in response to perceived abandonment, splitting behaviors, and chronic emptiness.
These intense, unstable emotions and boundary issues are classic hallmark features of borderline personality disorder.

Key Concept

Differentiating the core clinical features and interpersonal dynamics of Cluster A, B, and C personality disorders.
Estimated Time:1m 30s
Question 763Question →

Match each atypical patient clinical presentation with the most likely substance intoxication syndrome.

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Items

A 22-year-old man rapidly alternates between a profound, unarousable coma and severe, combative agitation. He exhibits significant bradycardia but awakens spontaneously and completely after 3 hours.
A 26-year-old man exhibits extreme agitation, severe paranoia, and violent behavior lasting for over 48 hours. Routine urine toxicology is negative, and he requires continuous intravenous sedation.
A 17-year-old boy presents with severe ataxia, dissociative visual hallucinations, hyperreflexia, and inducible ankle clonus after consuming a large quantity of an over-the-counter liquid.
A 15-year-old boy presents with ataxia and slurred speech. Examination reveals an erythematous, scaling perioral rash. Laboratory studies demonstrate a normal anion gap metabolic acidosis and hypokalemia.

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Answer

The correct matches are: the patient with alternating coma and agitation matches GHB; the patient with prolonged 48-hour delirium matches synthetic cathinones; the patient with ataxia and clonus matches dextromethorphan; and the patient with a perioral rash and metabolic acidosis matches toluene.
Each clinical vignette contains pathognomonic features that definitively link to only one substance. GHB uniquely causes alternating coma and agitation. Synthetic cathinones cause unusually prolonged delirium not seen with standard stimulants. Dextromethorphan uniquely combines NMDA antagonism with serotonin syndrome. Toluene uniquely causes Type 1 RTA alongside typical inhalant effects.

Step-by-Step Solution

1
Analyze the first presentation for highly specific temporal and neurologic features.
Identify the rapid cycling between profound coma and combativeness, resolving in a few hours.
GHB has a very narrow therapeutic index and unique receptor pharmacodynamics (GABA-B) that cause rapid clinical state shifts from deep central nervous system depression to severe agitation.
2
Evaluate the second presentation focusing on duration and toxicology results.
Identify the prolonged multi-day delirium with negative standard urine toxicology.
Amphetamine analogs found in synthetic cathinones evade standard immunoassay detection and have significantly longer half-lives than traditional stimulants like cocaine.
3
Correlate the third presentation's mix of dissociative and neuromuscular symptoms.
Recognize the combination of dissociation (NMDA antagonism) and hyperreflexia/clonus (serotonergic toxicity).
Dextromethorphan is the only commonly abused over-the-counter substance that simultaneously acts as an NMDA antagonist and a serotonin reuptake inhibitor.
4
Analyze the fourth presentation's dermatological and acid-base abnormalities.
Connect the perioral rash with the laboratory finding of normal anion gap metabolic acidosis and hypokalemia.
Chronic or subacute toluene inhalation causes distal renal tubular acidosis (Type 1 RTA) and a characteristic perioral contact dermatitis.

Key Concept

Differentiating atypical or lesser-known substance intoxications through unique clinical identifiers (e.g., fluctuating consciousness, prolonged duration, specific toxidrome combinations, and acid-base disturbances).
Question 764Question →

Match each patient's core clinical presentation and disease progression pattern to the most likely neurocognitive disorder diagnosis.

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Items

Insidious onset of prominent short-term memory impairment and word-finding difficulties, with later development of apraxia and agnosia.
Fluctuating cognitive impairment, recurrent well-formed visual hallucinations, and spontaneous onset of parkinsonian motor features.
Early and prominent behavioral changes, including severe disinhibition, loss of empathy, and hyperorality, with relative sparing of memory.
Stepwise decline in executive function and processing speed, typically accompanied by focal neurological deficits on physical examination.

Matches

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Answer

The presentations match as follows: isolated memory loss to Alzheimer disease; fluctuating cognition with hallucinations to Lewy body dementia; early disinhibition to Frontotemporal dementia; and stepwise decline to Vascular dementia.
Each neurocognitive disorder has a distinct initial clinical signature based on the specific regions of the brain affected early in the disease process. Alzheimer disease typically begins in the medial temporal lobe, disrupting memory. Frontotemporal dementia affects the frontal and temporal lobes first, altering behavior and language. Lewy body dementia involves widespread cortical and subcortical alpha-synuclein deposition, leading to hallucinations and parkinsonism. Vascular dementia depends on stroke location but classically causes a stepwise decline corresponding to discrete ischemic events.

Step-by-Step Solution

1
Analyze the first clinical presentation
Identified predominant early short-term memory loss and apraxia
Memory deficits followed by general cortical signs point directly to Alzheimer disease.
2
Analyze the second clinical presentation
Identified visual hallucinations, fluctuating cognition, and parkinsonism
These three symptoms form the core diagnostic criteria for Lewy body dementia.
3
Analyze the third clinical presentation
Identified behavioral disinhibition, apathy, and hyperorality without early memory loss
Severe personality and behavioral changes preceding memory deficits strongly indicate Frontotemporal dementia.
4
Analyze the fourth clinical presentation
Identified stepwise decline and focal neurological deficits
A stepwise clinical course implies sequential infarcts, pointing to Vascular dementia.

Key Concept

Differentiation of major neurocognitive disorders based on their distinct initial clinical presentations and underlying affected brain regions.
Question 765Question →

Match each patient's presentation of a depressive disorder or related mood disturbance with the most appropriate therapeutic intervention.

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Items

A female patient in her early thirties is evaluated for profound sadness. Her psychiatric history includes a distinct 6-day period of reduced sleep, rapid speech, and impulsive behavior.
A male patient in his late sixties is admitted for a severe mood disorder. He refuses all oral intake, claiming his internal organs have decayed, leading to rapid physiological decline.
A young man who began taking sertraline for a first-episode major depressive disorder reports complete resolution of his symptoms after 6 weeks. He now strongly desires to stop taking the medication immediately.
A middle-aged woman with unipolar depression notes only a partial reduction in her symptoms despite completing an 8-week trial of fluoxetine at the maximum tolerated dosage.

Matches

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Answer

The correct pairings match each distinct clinical scenario to its evidence-based management: avoiding SSRI monotherapy for bipolar depression, utilizing ECT for life-threatening psychotic depression, ensuring a 4-to-9-month continuation phase to prevent early relapse, and utilizing augmentation for a partial SSRI response.
Each correct pairing applies foundational psychiatric management principles. Recognizing bipolar depression prevents the error of antidepressant monotherapy. Identifying life-threatening psychotic depression correctly prompts urgent ECT. Understanding the continuation phase of treatment prevents premature discontinuation. Recognizing partial response guides the choice of augmentation.

Step-by-Step Solution

1
Analyze the history of the female patient with reduced sleep and rapid speech.
The history confirms bipolar disorder rather than unipolar depression.
Screening for past hypomanic episodes is critical to avoid inappropriate antidepressant monotherapy.
2
Assess the severity and features of the older male patient's condition.
He exhibits psychotic features (somatic delusions) and life-threatening oral refusal.
These severe features mandate rapid intervention with ECT rather than waiting weeks for pharmacotherapy to take effect.
3
Determine the appropriate duration of therapy for the young man in remission.
Therapy must continue for 4 to 9 months beyond acute remission.
Premature discontinuation significantly increases the risk of an early relapse.
4
Formulate a plan for the middle-aged woman with partial SSRI response.
Augmentation is chosen over switching because she has shown some response and tolerates the medication.
Augmentation builds on the partial response without losing the progress already achieved.

Key Concept

Management of Depressive Disorders and Complications
Estimated Time:1m 30s
Question 766Question →

Match each clinical vignette describing a patient with a bipolar spectrum illness to the most appropriate next best step in management or pharmacologic rationale.

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Items

A 28-year-old man on bipolar maintenance therapy presents with ataxia, confusion, and a coarse tremor after starting a new medication for hypertension. Serum drug concentration is 2.1 mEq/L.
A 24-year-old woman with a history of recurrent depression presents with severe psychomotor agitation, pressured speech, and grandiosity three weeks after initiating citalopram.
A 32-year-old pregnant woman at 7 weeks gestation requires hospital admission for acute, severe mania with psychotic features. She has no prior psychiatric medication history.
A 40-year-old man with bipolar I disorder requires maintenance pharmacotherapy but has a history of severe hepatic steatosis and markedly elevated transaminases.
A 35-year-old woman with bipolar disorder presents with a diffuse, painful vesicular rash and mucosal ulcerations two weeks after her medication dosage was rapidly doubled.

Matches

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Answer

The correct matches align each unique clinical scenario with its definitive management: lithium toxicity requires hydration/hemodialysis; SSRI-induced mania requires stopping the SSRI; first-trimester mania is treated with antipsychotics; hepatic impairment necessitates renally cleared lithium; and lamotrigine-induced rash requires immediate cessation for Stevens-Johnson syndrome.
Each vignette represents a classic, high-yield clinical scenario in bipolar disorder management requiring a specific targeted intervention. Lithium is renally cleared and subject to thiazide toxicity. Antidepressants like citalopram can trigger manic switches and must be stopped. First-trimester mania is managed with antipsychotics rather than teratogenic mood stabilizers. Liver disease precludes hepatically cleared drugs like valproate, favoring lithium. Rapid lamotrigine titration causes Stevens-Johnson syndrome.

Step-by-Step Solution

1
Analyze the patient with ataxia, coarse tremors, and a level of 2.1 mEq/L.
Identify lithium toxicity precipitated by a new antihypertensive (thiazide).
Thiazides decrease renal lithium clearance, leading to toxic levels requiring IV hydration and cessation of the diuretic.
2
Evaluate the patient presenting with grandiosity after starting citalopram.
Identify SSRI-induced mania.
Antidepressant monotherapy is contraindicated in bipolar disorder due to the risk of triggering a manic switch; the SSRI must be stopped as the next best step.
3
Assess the 7-week pregnant patient with acute mania.
Select haloperidol or another safe antipsychotic.
Valproate and carbamazepine are strictly avoided in the first trimester due to teratogenicity, making antipsychotics the safest acute intervention.
4
Determine the best maintenance drug for a patient with severe hepatic disease.
Select lithium.
Lithium does not undergo hepatic metabolism, avoiding further liver injury in a patient with severely elevated transaminases.
5
Diagnose the vesicular rash with mucosal involvement after rapid drug titration.
Identify lamotrigine-induced Stevens-Johnson syndrome.
Rapid titration of lamotrigine dramatically increases the risk of life-threatening dermatologic reactions, requiring immediate drug discontinuation.

Key Concept

Management of bipolar disorder requires tailoring pharmacotherapy to patient-specific factors, recognizing drug-drug interactions (e.g., lithium and thiazides), managing unique toxicities (e.g., lamotrigine-induced Stevens-Johnson syndrome), and avoiding antidepressant monotherapy.
Question 767Question →

Review the clinical vignettes below and match each patient presentation to the most accurate subtype of delusional disorder.

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Items

A 45-year-old man who is convinced without evidence that his coworkers are conspiring to get him fired and have tapped his phone.
A 30-year-old woman who persistently believes a famous actor is secretly in love with her and sends him letters daily.
A 60-year-old man who insists he has a rare parasitic infection in his intestines despite multiple negative medical workups.
A 50-year-old woman who believes she has made a groundbreaking scientific discovery that will save humanity, though she has no background in science.

Matches

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Answer

The conspiracy belief aligns with the persecutory type, the celebrity love belief with the erotomanic type, the parasitic infection belief with the somatic type, and the unrecognized scientific discovery belief with the grandiose type.
Each delusional disorder subtype is defined strictly by its central thematic element. Identifying the core false belief directly dictates the accurate diagnostic classification without requiring analysis of symptom timeline, provided the symptoms have been present for at least 1 month.

Step-by-Step Solution

1
Identify the core theme of the fixed, false belief for each patient presentation.
Identified themes are: conspiracy/harm, secret love, physical illness/defect, and inflated self-worth/talent.
Delusional disorder subtypes are classified based on the predominant delusional theme.
2
Match the identified themes to the official psychiatric diagnostic nomenclature.
Conspiracy maps to Persecutory; secret love maps to Erotomanic; physical illness maps to Somatic; inflated self-worth maps to Grandiose.
Accurate classification is required for standardized diagnosis and subsequent management of delusional disorders.

Key Concept

Subtypes of delusional disorder are determined by the predominant theme of the patient's fixed, false beliefs.
Question 768Question →

Match each patient's clinical presentation and symptom timeline to the most appropriate DSM-5 psychiatric diagnosis.

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Items

Patient exhibits auditory hallucinations and flat affect for 7 months. During this total duration, a major depressive episode was present for only 6 weeks.
Patient exhibits persecutory delusions and disorganized behavior for 4 months with severe social impairment. No mood episodes have ever occurred.
Patient has a 4-year history of delusions. Major depressive episodes have been present for 3 years of this time. Currently, the patient is euthymic but has had hallucinations for the past month.
Patient presents with a 1-month history of severe depressed mood, hypersomnia, and feelings of worthlessness, accompanied simultaneously by voices saying 'you deserve to die'.
Patient develops sudden onset of disorganized speech and persecutory delusions lasting 14 days following a severe motor vehicle collision, followed by a complete return to baseline functioning.

Matches

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Answer

The correct matches rely on accurately applying the precise DSM-5 duration criteria for psychosis (<1 month, 1-6 months, >6 months) and calculating the proportional overlap of mood symptoms over the total illness duration.
The diagnosis of primary psychotic disorders and mood disorders with psychotic features depends critically on symptom duration and the temporal relationship between mood and psychotic symptoms. Brief psychotic disorder lasts less than 1 month, schizophreniform disorder lasts 1-6 months, and schizophrenia requires at least 6 months of symptoms. To differentiate schizoaffective disorder from schizophrenia, mood symptoms must be present for a majority of the total illness duration in schizoaffective disorder; if they are present for a minority of the time, it is classified as schizophrenia. If psychotic symptoms occur exclusively during mood episodes without independent periods of psychosis, the diagnosis is a primary mood disorder with psychotic features.

Step-by-Step Solution

1
Analyze the total uninterrupted duration of the psychotic symptoms.
Identify if the primary psychotic symptoms have been present for <1 month (Brief Psychotic Disorder), 1-6 months (Schizophreniform Disorder), or >6 months (Schizophrenia).
Duration is the primary differentiating factor for isolated psychotic disorders.
2
Assess the chronological relationship between psychosis and mood episodes.
Determine if psychosis ever occurs for >=2 weeks in the complete absence of a mood episode.
This differentiates Schizoaffective disorder (psychosis without mood for >=2 weeks) from MDD with psychotic features (psychosis occurs exclusively during mood episodes).
3
Calculate the proportion of time mood symptoms are present relative to the total duration of the illness.
Identify if the mood symptoms are present for a majority (>50%) or minority (<50%) of the total active and residual periods.
Schizoaffective disorder strictly requires mood symptoms to be present for the majority of the total illness duration; otherwise, a patient with a long psychotic history and brief mood episodes is diagnosed with Schizophrenia.

Key Concept

Differentiation of psychotic disorders based on exact total symptom duration and the longitudinal proportion of concurrent mood symptoms (majority vs. minority of illness duration).
Estimated Time:2m 0s
Question 769Question →

Nipple discharge can be a presenting symptom for various benign and malignant breast pathologies. Based on the characteristics of the discharge and associated physical exam findings, match each patient's clinical scenario with the most appropriate underlying diagnosis.

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Items

A 45-year-old female presents with spontaneous, unilateral, bloody nipple discharge and a small subareolar mass on ultrasound.
A 29-year-old female reports bilateral, expressible, non-bloody greenish discharge and cyclical, diffuse breast tenderness.
A 53-year-old female complains of unilateral, sticky, grayish-green discharge and periareolar inflammation without a distinct mass.
A 64-year-old female notes unilateral, blood-tinged discharge, nipple retraction, and a firm, fixed 3-cm breast mass.

Matches

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Answer

Properly diagnosing the etiology of nipple discharge relies on evaluating the patient's age, discharge characteristics (spontaneous vs. expressible, bloody vs. non-bloody), and associated exam findings.
Each presentation distinctly aligns with the classic clinical profile of the respective breast pathology based on age, discharge appearance, and physical exam findings.

Step-by-Step Solution

1
Analyze the clinical features of each patient's nipple discharge.
Identified distinguishing factors such as bloody versus non-bloody appearance, unilateral versus bilateral occurrence, and the presence of associated masses or skin changes.
Different etiologies have distinct clinical profiles that guide diagnosis.
2
Evaluate the 45-year-old with unilateral bloody discharge and a small subareolar mass.
Matched with intraductal papilloma.
This is the classic presentation for a benign intraductal papilloma, the most frequent cause of bloody nipple discharge.
3
Evaluate the 29-year-old with bilateral greenish discharge and cyclical pain.
Matched with fibrocystic changes.
Cyclical mastalgia and nonspontaneous discharge in a younger woman are hallmarks of this condition.
4
Evaluate the 53-year-old with unilateral sticky, grayish-green discharge and inflammation.
Matched with mammary duct ectasia.
Duct ectasia often presents in perimenopausal women with thick, colored discharge and localized periareolar inflammation.
5
Evaluate the 64-year-old with bloody discharge, nipple retraction, and a firm mass.
Matched with invasive breast carcinoma.
Advanced age combined with suspicious signs like retraction and a fixed mass heavily point toward malignancy.

Key Concept

Evaluation and differential diagnosis of pathologic versus physiologic nipple discharge.
Question 770Question →

Match each clinical scenario to the most appropriate pharmacologic intervention.

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Items

A 35-year-old man with alcohol use disorder, normal liver function, and a strong desire to reduce heavy drinking days.
A 45-year-old man with alcohol use disorder and decompensated cirrhosis who is motivated to maintain abstinence.
A 28-year-old pregnant woman with opioid use disorder seeking long-term maintenance treatment.
A 24-year-old man with pinpoint pupils and a respiratory rate of 6 breaths/min after suspected substance use.

Matches

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Answer

The correct matching pairs the patient with normal liver function to naltrexone, the patient with cirrhosis to acamprosate, the pregnant patient with opioid use disorder to buprenorphine, and the acutely overdosed patient to naloxone.
Each medication accurately targets the specific substance use disorder stage (maintenance vs. acute intoxication) while honoring patient-specific contraindications, such as pregnancy or hepatic impairment.

Step-by-Step Solution

1
Evaluate the 35-year-old man with alcohol use disorder and normal liver function.
Matches with Naltrexone.
Naltrexone is a first-line agent for alcohol use disorder and is safe when liver function is intact.
2
Evaluate the 45-year-old man with alcohol use disorder and decompensated cirrhosis.
Matches with Acamprosate.
Acamprosate is renally excreted, making it safe in severe hepatic impairment, unlike hepatotoxic alternatives.
3
Evaluate the 28-year-old pregnant woman with opioid use disorder seeking maintenance.
Matches with Buprenorphine.
Buprenorphine prevents opioid withdrawal and is an indicated, safe maintenance therapy during pregnancy.
4
Evaluate the 24-year-old man with pinpoint pupils and bradypnea.
Matches with Naloxone.
The presentation is a classic opioid overdose, requiring immediate reversal with naloxone.

Key Concept

Pharmacotherapy and acute management for substance use disorders
Question 771Question →

A 24-year-old male is evaluated in the outpatient psychiatry clinic for the management of a recently diagnosed bipolar I disorder. The physician discusses various maintenance medication options, their baseline monitoring requirements, and their characteristic adverse effect profiles. Match each psychotropic medication discussed during the consultation to its correct baseline monitoring requirement and specific adverse effect risk.

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Items

Lithium
Valproate
Lamotrigine
Quetiapine
Sertraline

Matches

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Answer

Lithium matches with baseline TSH/renal function testing. Valproate matches with baseline liver function tests and CBC. Lamotrigine matches with no specific baseline labs. Quetiapine matches with baseline lipid and glucose monitoring. Sertraline matches with being contraindicated as monotherapy.
Each medication correlates with specific clinical monitoring parameters and adverse effects. Lithium uniquely impacts the kidneys and thyroid; valproate impacts the liver and platelets; lamotrigine carries a risk of severe rash without needing baseline labs; quetiapine carries metabolic risks; and sertraline represents the danger of unopposed antidepressant therapy in bipolar disorder.

Step-by-Step Solution

1
Analyze the clinical requirement for baseline monitoring of lithium.
Lithium requires TSH and a basic metabolic panel.
Lithium toxicity primarily affects the thyroid and kidneys.
2
Analyze the clinical requirement for baseline monitoring of valproate.
Valproate requires liver function tests and a complete blood count.
Valproate is associated with hepatotoxicity and thrombocytopenia.
3
Analyze the clinical requirement for baseline monitoring of lamotrigine.
Lamotrigine does not require specific routine baseline labs.
The primary severe adverse effect is Stevens-Johnson syndrome, which requires clinical monitoring rather than laboratory screening.
4
Analyze the clinical requirement for baseline monitoring of quetiapine.
Quetiapine requires fasting lipids, A1c, and weight.
Second-generation antipsychotics are strongly associated with metabolic syndrome.
5
Analyze the role of sertraline in bipolar disorder.
Sertraline is contraindicated as monotherapy.
Antidepressants without mood stabilizers can precipitate manic switching in patients with bipolar disorder.

Key Concept

Different mood stabilizers require specific baseline laboratory monitoring based on their unique toxicity profiles. Furthermore, antidepressant monotherapy must be avoided in bipolar disorder due to the risk of manic switching.
Question 772Question →

Match each clinical presentation to the most appropriate diagnostic category.

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Items

A 45-year-old man constantly worries he has a brain tumor despite multiple normal MRI scans and only experiencing occasional mild headaches.
A 28-year-old woman develops sudden weakness in her right leg, but physical examination reveals normal muscle tone and a positive Hoover's sign.
A 32-year-old nurse presents with recurrent unexplained polymicrobial bacteremia and is found to be injecting feces into her central line to stay in the hospital.
A 50-year-old man claims debilitating whiplash following a minor car accident and is seeking disability payments, but surveillance video shows him lifting heavy boxes.

Matches

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Answer

The correct matches are: The patient with health worries has Illness anxiety disorder; the patient with incompatible weakness has Conversion disorder; the patient intentionally making herself sick for the sick role has Factitious disorder; and the patient faking injury for money is Malingering.
Each presentation uniquely aligns with one diagnosis based on the presence of intent and the type of gain. The man with headache worries has illness anxiety disorder due to high health anxiety without significant somatic symptoms. The woman with weakness has conversion disorder due to neurological symptoms clinically incompatible with anatomical pathways. The nurse with bacteremia has factitious disorder due to intentional self-harm to assume the sick role without external reward. The man seeking disability payments exhibits malingering due to intentional symptom exaggeration for secondary gain.

Step-by-Step Solution

1
Analyze each clinical vignette for the presence of intentional deception.
The nurse and the man seeking disability are engaging in intentional deception. The other two have unconscious, non-deceptive symptom production.
Differentiating conscious from unconscious symptom production is the first step in diagnosing somatic symptom spectrum disorders.
2
Differentiate the non-deceptive presentations.
The man with minimal headaches has illness anxiety disorder, while the woman with neurological deficits has conversion disorder.
Illness anxiety disorder involves fear of disease with minimal physical symptoms, whereas conversion disorder presents with clear neurological deficits incompatible with anatomy.
3
Differentiate the deceptive presentations based on motivation.
The nurse seeks the sick role (Factitious disorder), while the man seeks financial compensation (Malingering).
Factitious disorder is motivated by primary internal gain, while malingering is driven by secondary external gain.

Key Concept

Differentiating somatic symptom and related disorders based on symptom origin, patient intent, and secondary gain.
Question 773Question →

Match each clinical vignette describing a psychiatric presentation to the most appropriate DSM-5 diagnostic category based on core clinical features, symptomatology, and timeframe.

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Items

A 25-year-old mother experiences recurrent, distressing images of dropping her infant down the stairs. She knows these thoughts are irrational but feels compelled to repeatedly check the baby's crib locks to alleviate her intense anxiety.
A 32-year-old accountant rigidly insists on categorizing all household expenses, becomes angry when his strict routines are interrupted, and views his extreme perfectionism as a necessary virtue for a successful life.
A 45-year-old woman refuses to use public transportation or attend crowded concerts. She explains she is terrified she might experience sudden dizziness in these situations and would be completely unable to escape or get help.
A 19-year-old college student avoids eating in the cafeteria and attending dorm parties. He fears his hands will shake when holding a tray, leading others to judge him harshly as incompetent or weird.
A 28-year-old man presents with insomnia, restlessness, and anxiety that began 2 months after taking a new, highly demanding corporate job. He denies any life-threatening trauma. Symptoms cause distress but do not meet criteria for Generalized Anxiety Disorder.

Matches

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Answer

The correct matching aligns the mother with postpartum obsessions to Obsessive-Compulsive Disorder; the rigid, perfectionistic accountant to Obsessive-Compulsive Personality Disorder; the woman fearing inability to escape public places to Agoraphobia; the student fearing negative evaluation to Social Anxiety Disorder; and the man with job-related anxiety to Adjustment Disorder.
Each diagnosis is uniquely defined by specific DSM-5 criteria regarding the core cognition of the fear, the nature of the intrusive thoughts, and the relationship to a stressor. OCD requires ego-dystonic obsessions/compulsions. OCPD is characterized by ego-syntonic rigidity. Agoraphobia centers on the fear of being unable to escape. Social Anxiety Disorder centers on the fear of negative evaluation. Adjustment Disorder requires symptom onset within 3 months of an identifiable stressor without meeting criteria for another disorder.

Step-by-Step Solution

1
Differentiate Obsessive-Compulsive Disorder (OCD) from Obsessive-Compulsive Personality Disorder (OCPD).
Identify that the mother has true, ego-dystonic obsessions and compulsions (OCD), while the accountant has ego-syntonic perfectionism and rigidity without true obsessions or compulsions (OCPD).
OCD and OCPD sound similar but have fundamentally different psychopathology regarding the patient's relationship to their symptoms (ego-dystonic vs. ego-syntonic).
2
Distinguish between Agoraphobia and Social Anxiety Disorder by identifying the core underlying fear in situational avoidance.
Identify that the woman avoids crowds due to fear of being trapped without help (Agoraphobia), while the student avoids social settings due to fear of scrutiny and negative evaluation (Social Anxiety Disorder).
Both disorders involve avoidance of public situations, but the diagnostic criteria depend on the cognitive motivation behind the avoidance.
3
Evaluate the timeline and trigger for the man's anxiety symptoms.
Identify that the symptoms began within 3 months of a non-life-threatening stressor (a new job) and do not meet criteria for another specific anxiety disorder, establishing the diagnosis of Adjustment Disorder.
Adjustment Disorder requires a specific inciting stressor and serves as a diagnosis when full criteria for conditions like GAD or Major Depressive Disorder are not met.

Key Concept

Differential diagnosis of anxiety and related disorders based on core fear cognitions and ego-syntonic versus ego-dystonic symptom presentation.
Question 774Question →

Review the following psychiatric clinical scenarios and correlate each presentation with the most accurate DSM-5 diagnostic classification.

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Items

A 34-year-old woman experiences auditory hallucinations and persecutory delusions for 3 weeks following the sudden death of her spouse, after which she completely returns to her previous baseline.
A 25-year-old man exhibits disorganized speech, flattened affect, and delusions of being continuously monitored by the government for the past 8 months, accompanied by a severe decline in occupational functioning.
A 41-year-old man functions well at his accounting job but has firmly believed for the past 6 months that his neighbor is secretly poisoning his water supply. He exhibits no hallucinations or disorganized behavior.
A 29-year-old woman presents with a 4-month history of prominent auditory hallucinations and severe social withdrawal, with no history of major depressive or manic episodes.

Matches

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Answer

The correct correlations rely heavily on the timeline of symptoms: <1 month is brief psychotic disorder, 1-6 months is schizophreniform disorder, >6 months is schizophrenia, and isolated delusions without other psychotic symptoms point to delusional disorder.
Each diagnosis is accurately determined by strictly adhering to the DSM-5 duration criteria and specific symptom profiles. Brief psychotic disorder requires symptoms lasting less than 1 month, schizophreniform disorder lasts 1 to 6 months, schizophrenia requires at least 6 months of symptoms, and delusional disorder is characterized by isolated delusions for >1 month without the global functional decline or other prominent psychotic symptoms seen in schizophrenia.

Step-by-Step Solution

1
Identify the primary psychotic symptoms and level of functional impairment in each scenario.
Three patients have multiple psychotic symptoms (hallucinations, disorganized speech), while one patient only has an isolated delusion.
Distinguishing the breadth of psychotic symptoms separates delusional disorder from the schizophrenia spectrum.
2
Evaluate the exact duration of symptoms for the remaining three patients on the schizophrenia spectrum.
The durations are 3 weeks, 4 months, and 8 months.
Duration is the primary diagnostic differentiator for these primary psychotic disorders.
3
Correlate the observed durations with DSM-5 criteria.
3 weeks (<1 month) = Brief psychotic disorder. 4 months (1-6 months) = Schizophreniform disorder. 8 months (>6 months) = Schizophrenia.
This establishes the definitive diagnoses based on standard psychiatric criteria.

Key Concept

Differentiation of primary psychotic disorders based on symptom duration and specific symptom profiles.
Question 775Question →

Match each patient's clinical presentation with the most appropriate next step in management or pharmacotherapy.

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Items

A 31-year-old woman with 4 weeks of severe depression and anhedonia; history reveals a past 6-day episode of decreased need for sleep, grandiosity, and impulsive spending.
A 74-year-old man with 1 month of profound depression, delusions of poverty, and refusal to eat or drink resulting in severe dehydration and acute kidney injury.
A 45-year-old woman with major depressive disorder, previously well-controlled on paroxetine, who was recently diagnosed with breast cancer and initiated on adjuvant tamoxifen therapy.
A 60-year-old man developing major depressive disorder 4 weeks after a myocardial infarction; he requires pharmacotherapy but has a left ventricular ejection fraction of 35%.
A 21-year-old man presenting with 2 weeks of depressed mood, profound fatigue, hypersomnia, and increased appetite, which began 4 days after abruptly discontinuing his prescribed high-dose amphetamines.

Matches

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Answer

The clinical scenarios map to specific management branch points: bipolar depression (quetiapine/lurasidone), life-threatening psychotic depression (ECT), CYP2D6 drug interactions (switch from paroxetine), post-myocardial infarction depression (sertraline), and amphetamine withdrawal (supportive care).
Each clinical vignette tests a critical, high-yield branch point in the management of depressive presentations. The 31-year-old patient has unrecognized bipolar II disorder, requiring bipolar-specific agents (quetiapine/lurasidone) rather than SSRI monotherapy to avoid mood destabilization. The 74-year-old patient has severe psychotic depression with life-threatening starvation, making ECT the treatment of choice due to its rapid onset and high efficacy. The 45-year-old patient is taking tamoxifen, which requires CYP2D6 for activation; paroxetine is a strong CYP2D6 inhibitor and must be switched to an agent with minimal inhibition like venlafaxine. The 60-year-old patient requires depression treatment post-myocardial infarction, where sertraline is the evidence-based SSRI of choice due to excellent cardiovascular safety. The 21-year-old patient is experiencing amphetamine withdrawal, which mimics atypical depression but is a substance-induced, self-limiting condition that requires only supportive care.

Step-by-Step Solution

1
Evaluate the 31-year-old woman's history of a distinct 6-day episode of decreased sleep and grandiosity.
Diagnose bipolar II disorder, current episode depressed.
Screening for past hypomania/mania is critical before treating depression to avoid precipitating a manic switch with antidepressant monotherapy.
2
Assess the 74-year-old man's psychotic features combined with his refusal to eat.
Identify a life-threatening psychiatric emergency.
Severe physical compromise (starvation, acute kidney injury) in the context of psychotic depression requires the most rapid and effective intervention, which is ECT.
3
Analyze the drug-drug interaction between paroxetine and tamoxifen in the 45-year-old woman.
Identify paroxetine as a strong CYP2D6 inhibitor that drastically reduces tamoxifen's therapeutic efficacy.
Tamoxifen is a prodrug requiring CYP2D6 for conversion to its active anti-estrogen metabolite (endoxifen); a non-inhibiting alternative antidepressant must be chosen.
4
Determine the safest antidepressant for the 60-year-old man post-myocardial infarction with a reduced ejection fraction.
Select sertraline as the optimal pharmacotherapy.
Sertraline has an extensively established cardiovascular safety profile in patients with recent ischemic heart disease, unlike tricyclics or citalopram (which prolongs QTc).
5
Differentiate the etiology of the 21-year-old man's depressive symptoms occurring strictly after discontinuation of amphetamines.
Diagnose amphetamine withdrawal rather than a primary major depressive episode with atypical features.
Amphetamine 'crash' presents with profound depression, hypersomnia, and hyperphagia, but the temporal link to discontinuation indicates a self-limiting toxidrome requiring only supportive care.

Key Concept

The precise management of depressive disorders requires careful differentiation of unipolar vs. bipolar illness, recognition of life-threatening emergencies requiring ECT, mitigation of critical drug interactions (e.g., CYP2D6), understanding of cardiovascular safety, and distinguishing primary depression from substance withdrawal.
Question 776Question →

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

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Items

A 28-year-old man with a history of childhood conduct disorder frequently lies to coworkers for financial gain, acts aggressively when confronted, and shows no remorse for exploiting his peers.
A 32-year-old woman declines a promotion to team lead because she is terrified her colleagues will criticize her performance, despite expressing a deep longing to have closer work friendships.
A 45-year-old executive demands to be evaluated only by the CEO, frequently takes credit for his subordinates' work, and becomes visibly enraged when he is not praised during meetings.
A 36-year-old accountant spends hours perfectly aligning his spreadsheets, insists that his team follow his exact rigid protocols, and consistently misses project deadlines due to his extreme perfectionism.

Matches

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Answer

The correct matches are Antisocial PD for the deceitful man, Avoidant PD for the anxious woman desiring connection, Narcissistic PD for the grandiose executive, and Obsessive-Compulsive PD for the rigid perfectionist.
Each personality disorder can be identified by its core pervasive pattern. Antisocial PD is marked by disregard for others' rights. Avoidant PD involves social inhibition and hypersensitivity to negative evaluation. Narcissistic PD requires grandiosity and need for admiration. Obsessive-Compulsive PD involves pervasive preoccupation with order, perfection, and control.

Step-by-Step Solution

1
Evaluate the 28-year-old man's presentation.
Antisocial Personality Disorder.
Deceitfulness, lack of remorse, and aggressive behavior align with Cluster B antisocial traits.
2
Evaluate the 32-year-old woman's presentation.
Avoidant Personality Disorder.
Avoidance of occupational activities due to fear of criticism while still desiring social contact is classic for this Cluster C disorder.
3
Evaluate the 45-year-old executive's presentation.
Narcissistic Personality Disorder.
Grandiosity, need for admiration, and interpersonal exploitation are characteristic of this Cluster B disorder.
4
Evaluate the 36-year-old accountant's presentation.
Obsessive-Compulsive Personality Disorder.
Preoccupation with orderliness, perfectionism causing inefficiency, and rigidity identify this Cluster C disorder.

Key Concept

Differentiating personality disorders based on core clinical features across Clusters B and C.
Question 777Question →

Match each clinical presentation of acute substance intoxication to the primary molecular mechanism of the offending agent.

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Items

Euphoria, mydriasis, and ischemic chest pain in a young adult.
Severe tooth decay, skin excoriations, and prolonged psychosis.
Visual hallucinations, synesthesia, and intact reality testing.
Extreme psychomotor agitation, multidirectional nystagmus, and reduced pain perception.
Acute severe psychosis, tachycardia, and seizures after smoking an unregulated 'herbal' mixture.

Matches

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Answer

Cocaine to reuptake inhibition; Methamphetamine to vesicular displacement; LSD to 5-HT2A agonism; PCP to NMDA antagonism; Synthetic cannabinoids to CB1/CB2 full agonism.
Each clinical presentation perfectly matches the unique mechanism of action of the offending drug. Recognizing the specific toxidrome allows for the identification of the substance and its corresponding molecular mechanism.

Step-by-Step Solution

1
Analyze each clinical presentation to identify the specific substance involved.
Identified cocaine, methamphetamine, LSD, PCP, and synthetic cannabinoids.
Accurate recognition of toxidromes is required before determining the underlying pharmacologic mechanism.
2
Determine the molecular mechanism of action for each identified substance.
Cocaine inhibits reuptake; amphetamines displace vesicles; LSD is a 5-HT2A agonist; PCP is an NMDA antagonist; synthetic cannabinoids are full CB1/CB2 agonists.
USMLE Step 2 frequently requires linking clinical presentations directly to pathophysiological or pharmacological mechanisms.
3
Match the clinical presentation to the corresponding mechanism.
All items are successfully paired.
Finalizing the matches based on pharmacological profiles.

Key Concept

Substance Intoxication Toxidromes and Molecular Mechanisms
Question 778Question →

Match each patient's clinical presentation with the most appropriate tailored pharmacotherapy or neuromodulation therapy.

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Items

A 28-year-old woman, 3 weeks postpartum, presenting with mutism, refusal to eat or drink, and delusions that her internal organs are rotting.
A 65-year-old man, 4 weeks post-myocardial infarction, with pervasive low mood and anhedonia; recent ECG shows a QTc interval of 470 ms.
A 34-year-old woman with major depressive disorder on a maximum dose of venlafaxine, reporting resolved tearfulness but persistent profound fatigue, hypersomnia, and a 5-kg (11-lb) weight gain.
A 42-year-old man with a major depressive episode characterized by prominent early morning awakenings, severe anorexia with a 6-kg (13-lb) weight loss, and marked agitation.
A 24-year-old man presenting with severe low mood and psychomotor retardation; history reveals a distinct 5-day period last year of decreased need for sleep, pressured speech, and grandiose spending sprees.

Matches

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Answer

Clinical profiles are matched to specific treatments based on symptom clusters (e.g., mirtazapine for insomnia/anorexia, bupropion for fatigue/weight gain), medical comorbidities (sertraline for post-MI with prolonged QTc), acuity (ECT for life-threatening psychosis/inanition), and underlying diagnosis (quetiapine for bipolar depression).
Each correct match optimizes the therapeutic index by utilizing the specific side effect profile or mechanism of action of a psychiatric intervention to address the patient's unique comorbidities and symptom presentation.

Step-by-Step Solution

1
Identify the primary clinical challenge for each patient.
Patient 1: Psychosis/inanition. Patient 2: Cardiac risk. Patient 3: Residual atypical symptoms. Patient 4: Insomnia/anorexia. Patient 5: Bipolar II depression.
Depression management must be tailored to specific symptom profiles and medical histories, rather than using a single algorithm.
2
Select the treatment with a mechanism or side-effect profile that directly addresses the challenge.
ECT for rapid response; Sertraline for cardiac safety; Bupropion for activation; Mirtazapine for sedation/appetite; Quetiapine for bipolar depression.
Aligning treatment properties with patient needs maximizes efficacy and minimizes harm.

Key Concept

Tailored pharmacotherapy and neuromodulation in depressive disorders based on side effect profiles, medical comorbidities, and diagnostic history.
Question 779Question →

Match the following brief clinical presentations to their most appropriate DSM-5 psychiatric diagnosis.

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Items

A 26-year-old man avoids public transportation and shopping malls due to a terrifying fear of being unable to easily escape or get help if he develops incapacitating anxiety symptoms.
A 23-year-old woman frequently declines invitations to dinner parties and avoids speaking in meetings due to an overwhelming fear of being judged negatively by her peers.
A 31-year-old man presents with recurrent, sudden episodes of palpitations and a feeling of impending doom, leading to constant worry about experiencing another episode.
A 38-year-old woman reports feeling constantly 'on edge' for the past 8 months, uncontrollably worrying about her children, job, and finances, accompanied by chronic muscle tension.
A 29-year-old veteran experiences recurrent distressing nightmares, avoids fireworks, and feels emotionally detached from his family for the past year.

Matches

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Answer

The correct matches align each patient's core clinical fear and timeline with the definitive DSM-5 criteria: Patient 1 matches Agoraphobia, Patient 2 matches Social Anxiety Disorder, Patient 3 matches Panic Disorder, Patient 4 matches Generalized Anxiety Disorder, and Patient 5 matches Posttraumatic Stress Disorder.
Each diagnosis in the DSM-5 is defined by a specific core fear and symptom timeline. Agoraphobia focuses on escape and access to help; Social Anxiety focuses on interpersonal scrutiny; Panic Disorder focuses on the fear of the panic attacks themselves; Generalized Anxiety focuses on pervasive daily worry; and Posttraumatic Stress Disorder focuses on a constellation of intrusion, avoidance, and arousal symptoms following a traumatic event.

Step-by-Step Solution

1
Analyze the clinical presentation of the 26-year-old man avoiding public transport and malls.
Matches Agoraphobia.
The core fear is being unable to easily escape or obtain help in the event of developing panic-like symptoms, which is the defining feature of Agoraphobia.
2
Analyze the clinical presentation of the 23-year-old woman avoiding parties and meetings.
Matches Social Anxiety Disorder.
Her avoidance is driven by a fear of negative evaluation and scrutiny by peers, which defines Social Anxiety Disorder.
3
Analyze the clinical presentation of the 31-year-old man with sudden palpitations and worry about future episodes.
Matches Panic Disorder.
The presence of recurrent unexpected panic attacks followed by anticipatory anxiety (worry about the next attack) is the criteria for Panic Disorder.
4
Analyze the clinical presentation of the 38-year-old woman with chronic worry and muscle tension.
Matches Generalized Anxiety Disorder.
Excessive worry across multiple domains lasting more than 6 months, combined with somatic symptoms like muscle tension, is the classic presentation of Generalized Anxiety Disorder.
5
Analyze the clinical presentation of the 29-year-old veteran with nightmares and emotional detachment.
Matches Posttraumatic Stress Disorder.
The symptoms of re-experiencing (nightmares), avoidance (fireworks), and negative mood alterations (detachment) lasting longer than 1 month following trauma exposure indicate Posttraumatic Stress Disorder.

Key Concept

Differentiating anxiety and trauma-related disorders requires identifying the patient's primary underlying fear, the specific trigger for the anxiety, and the duration of the symptoms.
Question 780Question →

Match each clinical vignette with the most likely underlying neurocognitive diagnosis.

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Items

A 73-year-old woman experiences an insidious, progressive decline in her short-term memory over three years, initially struggling to recall recent conversations, with no focal motor deficits on examination.
A 59-year-old woman exhibits socially inappropriate behavior, profound apathy, and diminished hygiene over the past year, while her performance on spatial and memory tasks remains relatively intact.
A 68-year-old man presents with well-formed visual hallucinations of children playing in his room, fluctuating periods of confusion, and resting tremor with rigidity in his upper extremities.
A 76-year-old man has a history of multiple transient ischemic attacks and now presents with a stepwise deterioration in executive functioning and asymmetric deep tendon reflexes.
A 78-year-old man develops a slow, wide-based, shuffling gait, new-onset urinary incontinence, and slowed mentation without prominent cortical signs.

Matches

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Answer

The correct matches align each clinical vignette with its signature presentation: the patient with insidious memory loss has Alzheimer disease, the patient with behavioral changes has frontotemporal dementia, the patient with hallucinations and parkinsonism has Lewy body dementia, the patient with stepwise decline has vascular dementia, and the patient with gait impairment and incontinence has normal pressure hydrocephalus.
Each neurocognitive disorder has a distinct clinical signature. Alzheimer disease classically presents with insidious, progressive memory loss. Frontotemporal dementia features early behavioral and personality changes. Lewy body dementia is characterized by recurrent visual hallucinations, fluctuating alertness, and parkinsonism. Vascular dementia follows a stepwise decline temporally related to cerebrovascular events, often with focal neurologic deficits. Normal pressure hydrocephalus presents with the characteristic triad of magnetic gait, incontinence, and cognitive slowing.

Step-by-Step Solution

1
Analyze the clinical vignette for the 73-year-old woman.
Identified insidious short-term memory loss without focal signs.
To differentiate the most common cause of dementia, Alzheimer disease, from other etiologies.
2
Evaluate the 59-year-old woman's symptoms.
Noted early behavioral changes and apathy with spared memory.
These are hallmark features of frontotemporal dementia, distinguishing it from memory-first presentations.
3
Examine the 68-year-old man's presentation.
Recognized visual hallucinations, fluctuating cognition, and parkinsonism.
These form the core clinical criteria for Lewy body dementia.
4
Assess the 76-year-old man's history and exam.
Identified stepwise decline and asymmetric reflexes.
Indicative of multiple cerebral infarctions leading to vascular dementia.
5
Review the 78-year-old man's symptoms.
Found the triad of abnormal gait, incontinence, and cognitive slowing.
This triad is characteristic of normal pressure hydrocephalus, a potentially reversible cause of cognitive impairment.

Key Concept

Differential Diagnosis of Major Neurocognitive Disorders
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