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Psychiatry

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Question 161Question →

A 34-year-old man presents via telehealth for a follow-up visit. Over the past four weeks, he has experienced persistent low mood, hypersomnia, extreme fatigue, and a loss of interest in his usual activities. Five years ago, he was hospitalized for an episode characterized by grandiosity, pressured speech, and a significantly decreased need for sleep. He has not taken any medications for the past six months. Which of the following are appropriate pharmacological treatments for this patient's current condition? (Select all that apply)

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Answer: Quetiapine; Lurasidone; Olanzapine and fluoxetine combination

Answer

The correct treatments are quetiapine, lurasidone, and the olanzapine and fluoxetine combination.
The patient's history of a manic episode requiring hospitalization confirms a diagnosis of bipolar I disorder. He is currently presenting with an acute bipolar depressive episode. The goal of treatment is to alleviate depressive symptoms without inducing a manic switch. Quetiapine, lurasidone, and the olanzapine-fluoxetine combination are all first-line, FDA-approved treatments for acute bipolar depression. They provide both mood-stabilizing and antidepressant effects.

Step-by-Step Solution

1
Diagnose the patient's underlying psychiatric disorder based on his history.
The patient has a history of an episode featuring grandiosity, pressured speech, and decreased need for sleep leading to hospitalization, which defines a manic episode. Therefore, his overarching diagnosis is bipolar I disorder.
Accurate diagnosis of bipolar disorder is necessary because depressive episodes in bipolar disorder must be treated differently than unipolar major depressive disorder.
2
Identify the patient's current clinical state.
The patient is currently experiencing a major depressive episode (low mood, hypersomnia, fatigue, anhedonia).
Treatment selection depends on the current phase of bipolar disorder (e.g., acute mania, acute depression, or maintenance).
3
Select appropriate pharmacotherapy for acute bipolar depression.
Appropriate options include quetiapine, lurasidone, or the olanzapine-fluoxetine combination. Antidepressant monotherapy must be avoided.
Antidepressant monotherapy can precipitate a manic switch in patients with bipolar disorder.

Key Concept

Acute depressive episodes in bipolar I disorder should be treated with specific second-generation antipsychotics (e.g., quetiapine, lurasidone) or combinations (e.g., olanzapine-fluoxetine) rather than antidepressant monotherapy, which carries a high risk of inducing mania.
Question 162Question →

A 45-year-old man is diagnosed with a first episode of severe, non-psychotic major depressive disorder. He is medically healthy and has no previous psychiatric treatment history. According to standard stepped-care guidelines for major depressive disorder, arrange the following therapeutic management steps in the most appropriate chronological sequence, assuming the patient exhibits only a partial response to each consecutive intervention.

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Answer

The correct sequence for managing treatment-resistant depression is to first initiate first-line monotherapy, optimize its dosage, augment with a second agent upon partial response, and finally consider neuromodulation such as ECT if pharmacological options are exhausted.
The stepped-care approach to major depressive disorder prioritizes efficacy while minimizing side effects and polypharmacy. It begins with a single well-tolerated agent. If the response is partial, the clinician's first obligation is to ensure the dose is optimized to confirm whether it is a true failure at therapeutic levels. If partial response persists despite dose optimization, augmentation (e.g., with a second-generation antipsychotic) is indicated to boost efficacy. Finally, if the patient fails multiple adequate medication trials, they are deemed to have treatment-resistant depression, at which point interventional treatments like ECT become appropriate.

Step-by-Step Solution

1
Establish the diagnosis and select initial therapy.
Initiate first-line pharmacotherapy with a selective serotonin reuptake inhibitor (SSRI).
SSRIs are standard first-line agents with a favorable efficacy and side-effect profile for non-psychotic major depressive disorder.
2
Assess clinical response at 4 to 8 weeks.
Optimize the dosage of the initial SSRI to the maximum tolerated level.
A common cause of perceived treatment failure is an inadequate dose; maximizing the dose ensures an adequate trial before discarding the medication.
3
Re-evaluate after dose optimization reveals only partial improvement.
Augment the current regimen with a second-generation antipsychotic or lithium.
For partial responders to an adequate monotherapy trial, adding an augmenting agent targets residual symptoms without discarding the partial benefit of the SSRI.
4
Assess for treatment-resistant depression after multiple failed pharmacological trials.
Refer the patient for electroconvulsive therapy (ECT) or repetitive transcranial magnetic stimulation (rTMS).
When standard step-care psychopharmacology fails, the patient meets criteria for treatment-resistant depression, indicating the need for highly effective neuromodulation.

Key Concept

Stepped-care management of Major Depressive Disorder involves initial monotherapy, dose optimization, augmentation or switching strategies, and ultimately neuromodulation for treatment-resistant cases.
Question 163Question →

A 78-year-old woman with a 6-year history of Alzheimer disease is brought to the clinic for a routine follow-up. Her family asks the physician about the natural progression of the disease to help them prepare for future care needs. The physician explains the typical chronological decline expected in this condition. Arrange the following clinical features in the correct chronological sequence that they typically appear during the natural course of Alzheimer disease, from earliest to latest.

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Answer

The correct chronological progression is: mild short-term memory impairment, followed by the loss of instrumental activities of daily living (such as managing finances), then the loss of basic activities of daily living (such as bathing), and finally severe motor rigidity and mutism.
Alzheimer disease has a characteristic progressive pattern of cognitive and functional decline. It begins with prominent short-term memory impairment due to early hippocampal involvement. As the disease spreads to the frontal and parietal association cortices, higher-level executive functions are impaired, leading to a loss of ability to perform complex tasks (Instrumental ADLs). With further progression, basic self-care abilities (Basic ADLs) are lost. Finally, in the end-stages, global cortical damage results in severe neurologic deficits, including mutism, motor rigidity, and a bedbound state.

Step-by-Step Solution

1
Identify the initial presentation of Alzheimer disease.
Short-term memory impairment.
The disease typically begins in the medial temporal lobe (hippocampus), which is responsible for forming new memories.
2
Determine the next level of functional decline as cortical involvement spreads.
Impairment in instrumental activities of daily living (IADLs).
Complex tasks like managing finances and cooking require executive function and working memory, which are affected before basic self-care skills.
3
Identify the consequence of more diffuse cortical atrophy in moderate-to-severe disease.
Impairment in basic activities of daily living (ADLs).
Basic tasks such as bathing, dressing, and toileting become compromised as parietal and frontal lobe involvement worsens.
4
Identify the features of late/end-stage Alzheimer disease.
Motor rigidity, mutism, and total dependence.
Global severe brain atrophy eventually destroys nearly all cognitive and motor functions, leading to a bedbound, mute state.

Key Concept

The classic chronological progression of Alzheimer disease: memory loss -> IADL impairment -> ADL impairment -> severe motor/language loss.
Question 164Question →

An emergency department physician evaluates a 31-year-old man who presents with a 4-week history of severe depressed mood, hypersomnia, and a 6-kg (13.2-lb) weight gain. He recently took a leave of absence from his job as an accountant because he "lacks the mental energy to look at spreadsheets." Review of his electronic medical record reveals a prior hospitalization one year ago for acute agitation, pressured speech, and decreased need for sleep lasting 10 days; during that admission, he was convinced he had discovered a secret formula for infinite energy. He currently takes no medications and has no other medical conditions. Vital signs are within normal limits. Laboratory evaluation shows a normal comprehensive metabolic panel, negative urine toxicology screen, and a normal thyroid-stimulating hormone (TSH) level. The physician is formulating a comprehensive management plan. Which of the following statements regarding the diagnosis and management of this patient are correct? (Select all that apply)

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Answer: Quetiapine monotherapy is an appropriate first-line pharmacological intervention for his current presentation.; Routine screening of fasting plasma glucose and a lipid panel is indicated before and during his planned psychopharmacologic treatment.

Answer

The correct statements are that quetiapine monotherapy is an appropriate first-line treatment, and that routine screening of fasting plasma glucose and a lipid panel is indicated.
The patient's history of a manic episode with psychotic features (hospitalization for agitation, pressured speech, decreased need for sleep, and grandiose delusions) establishes a diagnosis of Bipolar I disorder. His current symptoms of hypersomnia, weight gain, and severe depressed mood represent an acute bipolar depressive episode. First-line pharmacotherapy for bipolar depression includes quetiapine, lurasidone, or lithium. Because quetiapine and other second-generation antipsychotics are associated with a risk of metabolic syndrome, standard of care requires obtaining a baseline fasting plasma glucose and lipid panel, and monitoring these parameters regularly during treatment.

Step-by-Step Solution

1
Analyze the patient's psychiatric history.
The patient had a 10-day episode of elevated mood, pressured speech, decreased sleep, and grandiose delusions requiring hospitalization.
To establish a baseline diagnosis of Bipolar I disorder, which requires at least one manic episode.
2
Evaluate the current clinical presentation.
The patient is experiencing a 4-week period of severe depressed mood, hypersomnia, weight gain, and inability to work.
To diagnose an acute major depressive episode, which, in the context of his history, confirms the current phase is acute bipolar depression.
3
Determine the appropriate pharmacological interventions and necessary diagnostic workup.
First-line treatment for bipolar depression includes specific second-generation antipsychotics (e.g., quetiapine, lurasidone). Initiation of these medications requires baseline and ongoing metabolic monitoring. Antidepressant monotherapy must be avoided.
To formulate a safe and effective management plan while avoiding interventions that could precipitate a manic switch or cause severe drug interactions.

Key Concept

Diagnosis of Bipolar I Disorder and appropriate management of acute bipolar depression, including avoiding antidepressant monotherapy and ensuring metabolic monitoring for second-generation antipsychotics.
Question 165Question →

A 30-year-old woman is evaluated in the clinic 2 weeks after surviving a severe house fire. She reports experiencing frequent, distressing nightmares about the fire, hypervigilance, and a new inability to experience positive emotions. She actively avoids anything that reminds her of the event, including cooking and candles. Her past psychiatric history is significant for Bipolar I disorder, which is currently stable, and a history of treatment-resistant depression for which she takes phenelzine. She asks what can be done to manage her current distressing symptoms. Which of the following are the most appropriate management steps for this patient? (Select two)

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Answer: Provide education and reassurance about common acute stress reactions; Initiate trauma-focused cognitive-behavioral therapy

Answer

The most appropriate management steps are to provide education and reassurance about common stress reactions, and to initiate trauma-focused cognitive-behavioral therapy.
This patient's presentation of intrusive nightmares, hypervigilance, and active avoidance 2 weeks after a life-threatening trauma is classic for Acute Stress Disorder (ASD). The cornerstone of initial ASD management involves non-pharmacological approaches, specifically trauma-focused cognitive-behavioral therapy and psychoeducation to reassure the patient that these are common, expected reactions to extreme stress. Routine pharmacotherapy is not first-line for ASD.

Step-by-Step Solution

1
Identify the primary diagnosis based on the clinical presentation and timeline.
The patient has Acute Stress Disorder (ASD), given the life-threatening trauma exposure, intrusive nightmares, avoidance behaviors, and symptom duration of less than one month.
Differentiating ASD from Post-Traumatic Stress Disorder (PTSD) relies strictly on the 1-month timeframe threshold.
2
Determine the standard first-line management for Acute Stress Disorder.
First-line management includes trauma-focused cognitive-behavioral therapy (CBT), coupled with psychoeducation and reassurance.
These non-pharmacological interventions are highly effective for ASD and actively help prevent the development of long-term PTSD.
3
Evaluate the safety of potential pharmacological interventions based on the patient's specific medical history.
The patient cannot safely receive SSRIs or SNRIs.
She has Bipolar I disorder, meaning SSRI monotherapy risks a manic switch. Furthermore, she is currently taking phenelzine (an MAOI), making the addition of serotonergic agents an absolute contraindication due to the risk of serotonin syndrome.

Key Concept

First-line non-pharmacological management of Acute Stress Disorder and critical pharmacological contraindications in psychiatric comorbidities.
Question 166Question →

A 46-year-old woman is evaluated in the psychiatric clinic for an acute bipolar depressive episode. She has a history of bipolar I disorder with multiple past hospitalizations for severe mania. Her medical history includes hypertension, chronic lower back pain, and Hashimoto thyroiditis. Her current medications are lisinopril, naproxen (taken daily), and levothyroxine. Laboratory studies show a normal serum creatinine with an estimated glomerular filtration rate (eGFR) of 95 mL/min/1.73m² and a normal thyroid-stimulating hormone (TSH) level. The psychiatrist plans to initiate lithium carbonate for her current depressive episode and for long-term maintenance.

Which of the following are appropriate steps in the management of this patient prior to or during the initiation of lithium therapy? (Select all that apply)

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Answer: Discontinue lisinopril and transition to amlodipine for blood pressure control; Instruct the patient to discontinue naproxen and use acetaminophen for analgesia; Obtain a baseline electrocardiogram (ECG) to evaluate for conduction abnormalities

Answer

The correct steps are discontinuing lisinopril in favor of amlodipine, replacing naproxen with acetaminophen, and obtaining a baseline ECG.
Safe initiation of lithium requires managing dangerous drug interactions and performing age-appropriate medical screening. Lisinopril (ACE inhibitor) and naproxen (NSAID) both significantly decrease renal lithium clearance and must be replaced with safe alternatives like amlodipine and acetaminophen. Furthermore, patients over age 40 require a baseline ECG prior to lithium initiation due to the risk of conduction abnormalities.

Step-by-Step Solution

1
Analyze the patient's current medication list for pharmacokinetic interactions with lithium.
Identify lisinopril (an ACE inhibitor) and naproxen (an NSAID) as high-risk interacting drugs.
Lithium has a narrow therapeutic index, and its renal clearance is significantly decreased by ACE inhibitors and NSAIDs, which can precipitate life-threatening lithium toxicity.
2
Determine appropriate substitutions for the interacting medications.
Select amlodipine (a calcium channel blocker) instead of lisinopril, and acetaminophen instead of naproxen.
Calcium channel blockers and acetaminophen do not significantly alter renal lithium clearance and are safe alternatives for blood pressure and pain management in this context.
3
Evaluate the patient's age and cardiovascular risk for necessary pre-treatment screening.
Identify the need for a baseline electrocardiogram (ECG).
The patient is 46 years old, which meets the guideline threshold (age > 40) for a baseline ECG prior to lithium initiation to rule out underlying cardiac conduction disease.
4
Evaluate the proposed alternative or adjunctive psychiatric interventions for safety and efficacy.
Reject paroxetine monotherapy and prophylactic hydrochlorothiazide.
SSRI monotherapy risks a manic switch in bipolar I disorder, and starting a thiazide would drastically increase lithium levels and toxicity risk.

Key Concept

Pre-treatment workup and pharmacokinetic drug interactions of lithium therapy in bipolar disorder.
Question 167Question →

A 29-year-old woman presents to the primary care clinic reporting a 6-week history of depressed mood, profound fatigue, and an inability to concentrate at work. She notes that her appetite has significantly increased, leading to a 4-kg (8.8-lb) weight gain. She often sleeps for 12 hours a night but still wakes up feeling unrefreshed, and states that her arms and legs frequently feel "like lead." Her medical history is unremarkable, and she takes no medications. Her vital signs are within normal limits. She recalls experiencing a similar episode of depression during her first year of college, which eventually resolved without treatment. The physician is considering initiating pharmacotherapy for her symptoms. Which of the following is the most appropriate next step in management?

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Answer: Elicit a detailed history regarding periods of impulsivity, grandiosity, and decreased need for sleep

Answer

Elicit a detailed history regarding periods of impulsivity, grandiosity, and decreased need for sleep
This patient presents with a major depressive episode characterized by atypical features (leaden paralysis, hypersomnia, weight gain, and profound fatigue). Before prescribing any antidepressant therapy, it is a critical requirement to screen every patient for a lifetime history of manic or hypomanic episodes. Bipolar disorder frequently begins with depressive episodes, and atypical features are particularly common in bipolar depression. If an antidepressant is given as monotherapy to a patient with unrecognized bipolar disorder, it can precipitate a manic or hypomanic episode (antidepressant-induced manic switch). Therefore, eliciting a history of impulsivity, grandiosity, and a decreased need for sleep is the most appropriate and necessary next step.

Step-by-Step Solution

1
Identify the primary clinical syndrome
The patient is experiencing a major depressive episode with atypical features, indicated by mood reactivity, hypersomnia, hyperphagia, and leaden paralysis.
Recognizing the current episode characteristics is necessary to determine the appropriate diagnostic and management pathways.
2
Evaluate the risk of bipolar disorder
The patient has a history of a prior depressive episode at a young age and current atypical features, both of which are commonly associated with bipolar depression.
Bipolar disorder often presents initially with depressive episodes, and recognizing this underlying vulnerability alters treatment significantly.
3
Determine the necessary prerequisite before initiating pharmacotherapy
The physician must screen for a lifetime history of mania or hypomania.
Starting an antidepressant (such as an SSRI) without a mood stabilizer in a patient with bipolar disorder can precipitate a dangerous manic switch.

Key Concept

All patients presenting with a major depressive episode must be screened for a history of manic or hypomanic episodes before initiating antidepressant monotherapy to avoid precipitating a manic switch.
Question 168Question →

A 23-year-old woman comes to the clinic reporting profound sadness, low energy, and poor concentration over the past 6 weeks. She sleeps up to 12 hours a day and has lost interest in her usual hobbies. Her medical history is notable for a psychiatric hospitalization three years ago. At that time, she experienced a two-week period of feeling 'invincible,' requiring only 2 to 3 hours of sleep per night, and impulsively spending her entire savings on luxury handbags. Her current vital signs and physical examination are unremarkable. Laboratory results, including a complete blood count, comprehensive metabolic panel, and thyroid-stimulating hormone (TSH) level, are within normal limits. Which of the following is the most appropriate initial medication for this patient's current symptoms?

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Answer: Lithium carbonate

Answer

Lithium carbonate
The correct answer is Lithium carbonate. This patient's current presentation of prolonged sadness and hypersomnia represents a major depressive episode. However, her history of a severe, hospitalized episode characterized by a decreased need for sleep, grandiosity, and excessive spending confirms a diagnosis of bipolar I disorder. The cornerstone of treatment for bipolar depression includes mood stabilizers (such as lithium or valproate) and certain second-generation antipsychotics (such as quetiapine or lurasidone). Lithium is highly effective in treating acute bipolar depression and serves as an excellent maintenance therapy to prevent future manic and depressive relapses.

Step-by-Step Solution

1
Analyze the current clinical presentation.
The patient has a 6-week history of depressed mood, hypersomnia, and anhedonia, indicating a major depressive episode.
To determine the acuity and phase of the current mood disturbance.
2
Evaluate the past psychiatric history.
The patient had a previous 2-week episode of grandiosity, decreased need for sleep, and excessive spending requiring hospitalization, which meets the criteria for a manic episode.
To differentiate between major depressive disorder (unipolar) and bipolar disorder.
3
Establish the diagnosis.
Bipolar I disorder, current episode depressed.
A lifetime history of at least one manic episode defines Bipolar I disorder, regardless of the current symptom presentation.
4
Select the appropriate pharmacotherapy.
Lithium carbonate.
Lithium is a first-line agent for acute bipolar depression. Antidepressant monotherapy is contraindicated due to the risk of inducing a manic switch.

Key Concept

Patients presenting with depressive symptoms must be screened for a history of mania. Bipolar depression requires treatment with mood stabilizers (e.g., lithium, valproate) or approved atypical antipsychotics; antidepressant monotherapy is contraindicated due to the risk of precipitating a manic switch.
Estimated Time:45s
Question 169Question →

A 21-year-old male university student is evaluated in the student health center for worsening fatigue, hypersomnia, and feelings of worthlessness over the past month. He states that he is failing his classes and feels "it would be better if I just went to sleep and never woke up." Review of his medical record reveals a prior psychiatric hospitalization at age 19 for a week-long episode of decreased need for sleep, grandiosity, and reckless spending. He currently takes no medications and uses no illicit substances. The physician is formulating a comprehensive management plan. Which of the following statements regarding his diagnosis and pharmacological management are correct? Select all that apply.

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Answer: Initiation of quetiapine monotherapy is an appropriate first-line treatment for his current episode; Baseline renal function and thyroid panel testing should be obtained if lithium therapy is selected

Answer

The correct statements are that quetiapine monotherapy is an appropriate first-line treatment, and that baseline renal function and thyroid panel testing should be obtained if lithium therapy is selected.
This patient's history of a full manic episode (lasting at least 1 week with severe symptoms) confirms a diagnosis of Bipolar I Disorder. He is currently presenting with a severe acute bipolar depressive episode. Quetiapine monotherapy is FDA-approved and widely considered a first-line treatment for acute bipolar depression, as it treats depressive symptoms without a high risk of inducing mania. Alternatively, lithium could be used for treatment; however, because lithium is renally excreted and can cause nephrogenic diabetes insipidus, chronic kidney disease, and thyroid dysfunction (hypothyroidism), standard pre-treatment workup mandates baseline assessment of renal function (BUN/creatinine) and a thyroid panel.

Step-by-Step Solution

1
Identify the patient's primary diagnosis based on psychiatric history.
The patient has a history of a week-long episode of decreased sleep, grandiosity, and reckless spending, which meets the criteria for a manic episode, establishing a diagnosis of Bipolar I Disorder.
Accurate psychiatric diagnosis is required to select appropriate pharmacotherapy and avoid contraindicated medications.
2
Determine the nature of the current presentation.
The patient is currently experiencing a severe major depressive episode with suicidal ideation.
Treatment must specifically target the acute depressive phase without destabilizing the patient's underlying mood disorder.
3
Evaluate the pharmacological options and pre-treatment requirements for bipolar depression.
First-line treatments include quetiapine, lurasidone, or lithium. SSRI monotherapy must be avoided due to the risk of a manic switch. If lithium is chosen, baseline renal and thyroid tests are mandatory.
Standard of care for bipolar depression mandates avoiding unchecked serotonin elevation and monitoring for known organ toxicities of mood stabilizers.

Key Concept

Pharmacological management and pre-treatment workup of acute bipolar depression
Question 170Question →

During a routine wellness visit, a 28-year-old female patient presents with vague somatic complaints. She arrives wearing a deeply plunging neckline and a theatrical feather boa. Throughout the interview, she is exceptionally flirtatious with the male medical student and refers to the attending physician as her "absolute favorite doctor in the entire universe" despite this being their first meeting. Her speech is impressionistic and lacks detail; when asked to describe her diet, she says it is "glorious and perfectly balanced" without providing any specifics. Her medical history is unremarkable. Which of the following statements regarding this patient's most likely underlying psychiatric condition are true? (Select all that apply)

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Answer: Clinical presentation is typified by interactions that are frequently inappropriately sexually seductive or provocative.; The patient typically displays a rapidly shifting and shallow expression of emotions.

Answer

The correct statements are that the clinical presentation involves inappropriately sexually seductive behavior, and the patient displays rapidly shifting, shallow expression of emotions.
The correct options accurately reflect the core DSM-5 diagnostic criteria for Histrionic Personality Disorder. This condition is characterized by a pervasive pattern of excessive emotionality and attention-seeking behavior beginning by early adulthood. Key features include being uncomfortable when not the center of attention, inappropriate sexually seductive or provocative behavior, and rapidly shifting, shallow expressions of emotion.

Step-by-Step Solution

1
Analyze the patient's behavioral presentation and speech patterns in the vignette.
The patient exhibits provocative clothing, flirtatious behavior, extreme but shallow emotional statements, and impressionistic speech lacking detail.
To synthesize the clinical signs necessary for psychiatric diagnosis.
2
Formulate a primary diagnosis based on the identified pattern of behavior.
The symptoms align perfectly with the DSM-5 diagnostic criteria for Histrionic Personality Disorder.
Establishing the correct diagnosis is required to evaluate the truthfulness of the provided statements.
3
Evaluate each option against the established features and standard management principles for Histrionic Personality Disorder.
Seductive behavior and shallow emotions accurately describe the disorder. Psychotic timeline criteria, inappropriate isolated SSRI monotherapy, and contraindicated SSRI/MAOI combinations are factually incorrect.
To isolate the true statements from the distractors based on common misconceptions.

Key Concept

Histrionic Personality Disorder
Estimated Time:1m 0s
Question 171Question →

A 45-year-old man with no prior psychiatric history is diagnosed with Major Depressive Disorder. Over the next two years, his condition proves difficult to manage, requiring escalating interventions based on his varying levels of therapeutic response at each stage. According to evidence-based guidelines for stepped-care psychiatric management, arrange the following clinical interventions in the most appropriate chronological order, progressing from initial presentation to the management of severe treatment-resistant depression.

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Answer

The correct chronological sequence for managing progressive treatment-resistant depression is: 1) Initial SSRI monotherapy optimization, 2) Switching to a different agent (SNRI) due to complete non-response, 3) Augmenting with an atypical antipsychotic due to partial response, and 4) Proceeding to Electroconvulsive Therapy (ECT) after multiple failed pharmacological trials.
The correct algorithm for depression pharmacotherapy relies on assessing the degree of response at each interval. Initial therapy utilizes an SSRI. If no response is observed after an adequate trial (4-6 weeks at max dose), a switch to a different monotherapy is indicated. If that subsequent trial yields a partial response, guidelines recommend augmenting with agents like aripiprazole, lithium, or thyroid hormone rather than switching again. Finally, if the depression remains functionally debilitating despite these sequential optimized medication trials (true treatment resistance), neuromodulation techniques such as ECT become the definitive standard of care.

Step-by-Step Solution

1
Identify the standard first-line treatment for an initial depressive episode.
Initial SSRI monotherapy and dose optimization is the starting point.
SSRIs have a favorable side effect profile and are the standard of care for initiating MDD treatment.
2
Determine the appropriate action for a complete non-response after an adequate 6-week trial.
Switching to a different monotherapy (e.g., an SNRI) is the next step.
Without any clinical improvement, augmenting is generally less effective than switching entirely to a medication with a potentially different mechanism or receptor binding profile.
3
Determine the appropriate action for a partial clinical response to the second trial.
Augmentation with a second agent (e.g., atypical antipsychotic) is indicated.
When a patient exhibits partial improvement, augmenting allows the clinician to preserve existing therapeutic gains while targeting residual symptoms.
4
Identify the definitive treatment for severe depression that has failed multiple pharmacological steps.
Referral for Electroconvulsive Therapy (ECT).
ECT is the most effective treatment for profound, treatment-resistant depression (failure of 2+ adequate trials of distinct classes/combinations).

Key Concept

Stepped-care management of Major Depressive Disorder (Switching vs. Augmentation vs. Neuromodulation)
Estimated Time:1m 30s
Question 172Question →

A 21-year-old college student presents to the student health center seeking help for extreme distress. For the past 4 months, he has experienced intrusive, distressing fears of contracting a fatal pathogen, leading him to wash his hands with bleach up to 30 times a day. He acknowledges that his fears are likely exaggerated but states the anxiety is unbearable unless he washes. His hands are severely excoriated and erythematous. Two days ago, an urgent care physician diagnosed a soft tissue infection on his right hand (confirmed methicillin-resistant Staphylococcus aureus) and prescribed a 10-day course of oral linezolid. During the interview, the patient appears visibly depressed and reports feeling hopeless. Upon further psychiatric history, he reveals that a year ago, he had a distinct one-month period where he slept only 2 hours nightly, spoke so rapidly that friends could not understand him, and engaged in reckless hypersexual behavior. He is not taking any other medications. Which of the following are the most appropriate management steps for his psychiatric symptoms? (Select 2 options)

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Answer: Refer for cognitive behavioral therapy that focuses on habituation to feared stimuli; Commence treatment with a mood-stabilizing atypical antipsychotic

Answer

The most appropriate steps are to refer the patient for exposure and response prevention therapy and to commence a mood-stabilizing medication such as an atypical antipsychotic.
The correct combination recognizes that while SSRIs are typically first-line for Obsessive-Compulsive Disorder, this patient has two absolute contraindications to SSRI monotherapy: current use of linezolid (an antibiotic with MAOI properties, creating a risk for serotonin syndrome) and a history of Bipolar I Disorder (creating a risk for antidepressant-induced mania). Therefore, the safest and most effective concurrent management includes psychotherapy (exposure and response prevention) for the OCD and a mood-stabilizing atypical antipsychotic to address the bipolar depression without risking a manic switch.

Step-by-Step Solution

1
Diagnose the patient's current psychiatric and medical conditions based on the clinical history.
The patient has Obsessive-Compulsive Disorder (OCD), Bipolar I Disorder (current episode depressed, history of mania), and a MRSA infection currently treated with linezolid.
Ego-dystonic obsessions and compulsions define OCD. The distinct period of decreased sleep, pressured speech, and impulsivity defines a past manic episode (Bipolar I).
2
Evaluate the pharmacological constraints for treating his OCD and depression.
Selective serotonin reuptake inhibitors (SSRIs), normally first-line for OCD, are contraindicated acutely due to linezolid (which has MAOI activity) and chronically as monotherapy due to the risk of precipitating mania in Bipolar I Disorder.
Combining an SSRI with an MAOI-like drug causes serotonin syndrome. Antidepressant monotherapy in bipolar disorder risks a manic switch.
3
Select safe, first-line, concurrent management strategies.
Exposure and response prevention (a specific form of cognitive behavioral therapy) is initiated for OCD, alongside a mood-stabilizing atypical antipsychotic to treat bipolar depression and safely augment OCD management.
This combination effectively targets the patient's distress while strictly adhering to safety guidelines regarding his comorbidities and concurrent antibiotic use.

Key Concept

Pharmacological constraints in the management of Obsessive-Compulsive Disorder complicated by Bipolar I Disorder and concurrent MAOI-like antibiotic therapy.
Question 173Question →

A 21-year-old university student is evaluated at the student health center at the insistence of his roommate. The roommate is concerned because the patient spends most of his time alone in their shared apartment, intensely studying 'crystal energy fields' and claiming to occasionally perceive auras around people. However, the patient acknowledges that these auras might just be his imagination. During the clinical interview, the patient avoids eye contact and appears highly anxious. He wears a heavy winter trench coat despite it being the middle of summer. His speech is circumstantial and rich in unusual metaphors, yet he remains goal-directed. He explicitly denies hearing voices when no one is present or believing that others are conspiring against him. The patient states he has felt like an 'outsider' for as long as he can remember and has never had close friends. There is no history of distinct depressive or manic episodes. Which of the following is the most likely diagnosis?

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Answer: Schizotypal personality disorder

Answer

The correct answer is Schizotypal personality disorder.
The patient's clinical presentation is classic for schizotypal personality disorder (Cluster A). Key features include a pervasive pattern of interpersonal deficits, severe social anxiety that does not diminish with familiarity, eccentric behavior (wearing a heavy coat in summer), odd speech (circumstantial and highly metaphorical), and magical thinking (studying crystal energy fields and perceiving auras). Crucially, the patient's reality testing remains intact—he acknowledges that the auras might be his imagination, which distinguishes these odd beliefs from the fixed, false delusions of schizophrenia.

Step-by-Step Solution

1
Analyze the patient's presenting symptoms and timeline.
The patient demonstrates lifelong social isolation, magical thinking ('crystal energy fields', perceiving auras), eccentric attire (winter coat in summer), and circumstantial speech.
Identifying the core psychiatric signs is essential for differentiating between personality disorders and primary psychotic disorders.
2
Evaluate the patient's reality testing and presence of psychosis.
The patient acknowledges the auras might be his imagination and explicitly denies hallucinations or fixed delusions, indicating intact reality testing.
The absence of frank psychosis rules out the schizophrenia spectrum of illnesses.
3
Differentiate among Cluster A personality disorders.
The presence of cognitive and perceptual distortions (magical thinking) and eccentricities distinguishes this presentation from the pure social detachment seen in other Cluster A conditions.
Schizotypal pathology is uniquely characterized by odd beliefs and eccentricities, whereas schizoid pathology is defined by restricted affect and a lack of desire for relationships.

Key Concept

Schizotypal personality disorder is characterized by a pervasive pattern of social and interpersonal deficits, marked by acute discomfort with close relationships, as well as cognitive or perceptual distortions (e.g., magical thinking) and eccentricities of behavior, without frank psychosis.
Estimated Time:1m 0s
Question 174Question →

A 26-year-old male graduate student presents to the university health center complaining of severe sadness, lack of motivation, and poor concentration over the past 5 weeks. He states he has completely lost interest in his coursework and hobbies, which is highly unusual for him. He struggles to get out of bed, sleeping up to 14 hours a day, and reports a 5 kg (11 lb) weight gain during this time. Medical history is unremarkable, and he takes no medications. Physical examination reveals psychomotor retardation and a blunted affect, but vital signs and the remainder of the examination are within normal limits. He denies any suicidal ideation. The patient requests an antidepressant medication to help him "get back on track." Which of the following is the most appropriate next step in the clinical evaluation or management of this patient?

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Answer: Elicit a history of lifetime manic or hypomanic episodes.

Answer

The most appropriate next step is to screen the patient for a lifetime history of manic or hypomanic episodes.
This patient presents with a major depressive episode featuring atypical symptoms (hypersomnia, weight gain). Atypical features are particularly common in bipolar depression. The most critical next step before starting any antidepressant is to screen for a lifetime history of manic or hypomanic episodes. Treating unrecognized bipolar depression with antidepressant monotherapy carries a significant risk of precipitating a manic switch. If the patient has a history of mania/hypomania, mood stabilizers or atypical antipsychotics would be indicated instead of standard antidepressant monotherapy.

Step-by-Step Solution

1
Identify the primary clinical presentation.
The patient is experiencing a major depressive episode characterized by atypical features, specifically hypersomnia and weight gain.
Recognizing the symptom cluster helps guide the differential diagnosis, as atypical features are frequently seen in the depressive phase of bipolar disorder.
2
Determine the necessary safety and diagnostic evaluations prior to initiating pharmacotherapy.
The physician must screen for a history of mania or hypomania.
Antidepressant monotherapy can precipitate a manic or hypomanic episode (manic switch) in patients with underlying bipolar disorder. All patients presenting with major depression must be screened for bipolarity before prescribing unopposed antidepressants.

Key Concept

Prior to starting antidepressant monotherapy for a major depressive episode, clinicians must screen for a history of manic or hypomanic episodes to prevent precipitating a manic switch in patients with undiagnosed bipolar disorder.
Question 175Question →

Match each specific substance of abuse with its most characteristic clinical presentation and associated findings.

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Items

Phencyclidine (PCP) intoxication
Synthetic cathinone ("bath salts") intoxication
3,4-methylenedioxymethamphetamine (MDMA) intoxication
Inhalant (e.g., toluene, aerosols) abuse
Gamma-hydroxybutyrate (GHB) intoxication

Matches

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Answer

The correct matches pair PCP with rotary nystagmus and analgesia, synthetic cathinones with prolonged delirium and negative drug screens, MDMA with hyperthermia and hyponatremia, inhalants with perioral rash and cardiac arrhythmias, and GHB with sudden coma followed by abrupt awakening.
Each illicit substance has a unique toxidrome that differentiates it from others in its class. PCP is marked by nystagmus and analgesia; synthetic cathinones cause delirium lasting days that evades standard testing; MDMA is notable for inducing SIADH leading to hyponatremia; inhalants are associated with a perioral rash and sudden myocardial sensitization; GHB presents with a rapidly resolving deep coma.

Step-by-Step Solution

1
Analyze the clinical features associated with PCP intoxication.
Identified rotary nystagmus and dissociative anesthesia as hallmarks.
PCP specifically blocks NMDA receptors, leading to its unique dissociative properties.
2
Evaluate the presentation of synthetic cathinones compared to other stimulants.
Identified prolonged duration (days) and lack of detection on standard screens.
Bath salts have a different chemical structure and pharmacokinetic profile than standard amphetamines or cocaine.
3
Identify the unique metabolic derangements of MDMA.
Linked MDMA to severe hyponatremia and hyperthermia.
MDMA triggers excessive ADH release and serotonin efflux, distinguishing it from pure sympathomimetics.
4
Correlate physical signs of inhalant abuse with lethal complications.
Matched perioral rash and sudden cardiac arrest to inhalants.
Aerosols and solvents sensitize the heart to endogenous catecholamines.
5
Assess the pharmacodynamics of GHB overdose.
Matched rapid deep coma followed by abrupt awakening.
GHB has a very steep dose-response curve and a short half-life, leading to rapid fluctuations in consciousness.

Key Concept

Distinguishing distinct clinical toxidromes and laboratory findings among illicit substances to guide accurate diagnosis and acute management.
Question 176Question →

Match each patient's clinical presentation with the most likely personality disorder diagnosis.

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Items

A 29-year-old man is evaluated in a dermatology clinic for a rash. He wears a heavy wool coat despite the warm summer weather. His speech is vague and metaphorical, and he attributes his skin condition to 'misaligned cosmic energies.' He states he has no close friends because he feels intensely uncomfortable around others, even people he has known for years.
A 34-year-old man is brought to the emergency department after a physical altercation. He is initially charming and cooperative with the triage nurse. Later, he is caught taking syringes from an unattended medical cart. When confronted, he smoothly denies the theft and expresses no remorse, claiming the hospital 'has plenty to spare anyway.'
A 26-year-old woman presents to a primary care clinic for fatigue. She mentions she recently declined a promotion at her remote job because she feared she would be heavily criticized by her new managers. She expresses a strong desire to have a romantic relationship but avoids dating entirely because she is convinced she is socially inept and unappealing.
A 42-year-old woman is evaluated for a minor ankle sprain. She displays exaggerated distress, loudly demanding to see the 'chief of medicine' immediately. She is dressed provocatively and wears heavy, theatrical makeup. She repeatedly refers to the medical assistant she met only ten minutes ago as her 'absolute dearest confidant.'

Matches

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Answer

The presentations match as follows: The patient with magical thinking and severe social anxiety has Schizotypal PD. The deceitful, remorse-lacking patient has Antisocial PD. The patient fearing rejection but desiring relationships has Avoidant PD. The highly dramatic, attention-seeking patient has Histrionic PD.
Each patient's clinical presentation aligns with the DSM-5 diagnostic criteria for a specific personality disorder. The man with magical thinking has schizotypal PD; the man stealing without remorse has antisocial PD; the woman avoiding promotions due to fear of criticism has avoidant PD; and the overly dramatic woman has histrionic PD.

Step-by-Step Solution

1
Analyze the first vignette for core personality traits.
Identified odd beliefs, peculiar appearance, odd speech, and persistent social anxiety.
These findings point to a Cluster A disorder, specifically schizotypal personality disorder.
2
Analyze the second vignette for core personality traits.
Identified deceitfulness, theft, physical aggression, superficial charm, and lack of remorse.
These behaviors violate the rights of others and societal norms, indicating antisocial personality disorder.
3
Analyze the third vignette for core personality traits.
Identified avoidance of occupational and social activities due to fear of criticism, coupled with feelings of inadequacy and a desire for relationships.
The desire for connection paired with extreme fear of rejection defines avoidant personality disorder.
4
Analyze the fourth vignette for core personality traits.
Identified dramatic presentation, attention-seeking, provocative dress, and overestimation of intimacy.
These exaggerated, theatrical behaviors are characteristic of histrionic personality disorder.

Key Concept

Differential diagnosis of personality disorders across Clusters A, B, and C based on predominant behavioral and interpersonal patterns.
Estimated Time:1m 30s
Question 177Question →

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

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Items

A 72-year-old man with major depressive disorder refuses to eat or drink for 4 days, resulting in acute kidney injury. He is actively hallucinating that his internal organs are rotting.
A 58-year-old man presents with depressed mood, anhedonia, and insomnia 4 weeks after an acute anterior wall myocardial infarction. He is clinically stable on his current cardiac medications.
A 24-year-old man with newly diagnosed major depressive disorder reports severe insomnia and weight loss. He has a history of epilepsy on levetiracetam and requests a treatment lacking sexual side effects.
A 45-year-old woman on escitalopram 20 mg daily for 8 weeks reports only partial improvement in her depressive symptoms. She continues to struggle with profound daytime fatigue and poor concentration.
A 62-year-old woman with breast cancer presents with major depression. She recently started tamoxifen therapy. She requests medication to improve her mood and manage severe concurrent hot flashes.

Matches

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Answer

The 72-year-old man with food refusal requires electroconvulsive therapy. The 58-year-old man post-myocardial infarction requires sertraline. The 24-year-old man with epilepsy requires mirtazapine. The 45-year-old woman with residual fatigue requires bupropion augmentation. The 62-year-old woman on tamoxifen requires venlafaxine.
Each patient requires a highly specific intervention based on their medical comorbidities and symptom profiles. Electroconvulsive therapy is required for life-threatening psychotic depression. Sertraline is chosen for post-myocardial infarction safety. Mirtazapine is selected to avoid sexual dysfunction in a patient who cannot take bupropion due to epilepsy. Bupropion is added to an SSRI for partial response with residual fatigue. Venlafaxine is chosen to avoid CYP2D6 interactions with tamoxifen while also effectively treating concurrent hot flashes.

Step-by-Step Solution

1
Analyze the 72-year-old man's presentation.
Severe major depressive disorder with psychotic features and life-threatening oral refusal.
Identify the need for an emergent, rapid-acting intervention (electroconvulsive therapy) over slower-acting pharmacotherapy.
2
Evaluate the 58-year-old man's medical history.
Recent myocardial infarction requires a cardiac-safe antidepressant.
Sertraline is the best-studied and safest SSRI for patients with recent ischemic cardiac events.
3
Assess the 24-year-old man's specific requests and absolute contraindications.
Needs an agent without sexual side effects but cannot take bupropion due to epilepsy.
Mirtazapine avoids sexual dysfunction, does not significantly lower the seizure threshold, and addresses his concurrent severe insomnia.
4
Review the 45-year-old woman's treatment progress.
Partial response to an SSRI with persistent residual fatigue and poor concentration.
Bupropion augmentation is the standard next step to target these specific residual symptoms without discontinuing the partially effective SSRI.
5
Determine safe oncologic and psychiatric options for the 62-year-old woman on tamoxifen.
Must avoid CYP2D6 inhibitors to maintain tamoxifen efficacy, while also treating vasomotor symptoms.
Venlafaxine lacks significant CYP2D6 inhibition and is a first-line non-hormonal treatment for severe hot flashes.

Key Concept

Management of major depressive disorder must be strictly tailored to the patient's specific symptom profile, medical comorbidities, concurrent medications, and the acuity of the clinical situation.
Estimated Time:3m 0s
Question 178Question →

Match each patient's clinical presentation to the most appropriate DSM-5 diagnosis based on their specific symptom profile and duration.

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Items

A 28-year-old woman presents 2 weeks after surviving a severe earthquake. She reports intrusive memories of the event, actively avoids news related to the disaster, and experiences hypervigilance and severe insomnia.
A 45-year-old man reports 7 months of excessive, uncontrollable worry regarding his job security, finances, and his family's health, accompanied by chronic muscle tension, fatigue, and poor sleep.
A 32-year-old man describes recurrent, unexpected episodes of intense fear accompanied by tachycardia, shortness of breath, and a fear of dying, followed by a month of persistent worry about having future episodes.
A 22-year-old woman experiences severe distress and tearfulness that began 2 months after a difficult relationship breakup. Her symptoms impair her academic performance but she does not meet full criteria for a major depressive episode.
A 35-year-old woman has a marked, persistent fear of enclosed spaces, crowds, and public transportation. She avoids these situations entirely due to fear of being unable to escape or get help if she were to develop panic-like symptoms.

Matches

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Answer

The vignettes correctly match to Acute Stress Disorder, Generalized Anxiety Disorder, Panic Disorder, Adjustment Disorder, and Agoraphobia based on symptom duration and specific clinical features.
The correct matches are based on the specific DSM-5 diagnostic criteria for anxiety and trauma-related disorders. Acute Stress Disorder is diagnosed when trauma-related symptoms last between 3 days and 1 month. Generalized Anxiety Disorder requires excessive, generalized worry for at least 6 months. Panic Disorder is characterized by recurrent unexpected panic attacks with subsequent anticipatory anxiety. Adjustment Disorder involves clinically significant distress within 3 months of a stressor that does not meet criteria for another mental disorder. Agoraphobia is the fear and avoidance of situations where escape might be difficult if panic symptoms occur.

Step-by-Step Solution

1
Evaluate the timeline and nature of the trauma or stressor in each vignette.
The earthquake survivor's symptoms have lasted 2 weeks (Acute Stress Disorder). The student with the breakup has had symptoms for 2 months without meeting criteria for MDD (Adjustment Disorder).
Timeline is the primary distinguishing factor between Acute Stress Disorder (less than 1 month) and PTSD (greater than 1 month), as well as normal stress versus Adjustment Disorder.
2
Analyze the pattern of anxiety and panic symptoms in the remaining vignettes.
The patient with unexpected fear episodes and anticipatory anxiety matches Panic Disorder. The patient avoiding enclosed spaces due to fear of not being able to escape matches Agoraphobia. The patient with 7 months of chronic, generalized worry matches Generalized Anxiety Disorder.
Differentiating anxiety disorders requires isolating the core fear: unexpected physical arousal (Panic Disorder), difficulty escaping (Agoraphobia), or pervasive cognitive worry (GAD).

Key Concept

Diagnostic criteria and timelines for Anxiety, Obsessive-Compulsive, and Trauma-Related Disorders
Estimated Time:2m 0s
Question 179Question →

Match each clinical presentation of an antipsychotic-induced adverse effect to the primary pharmacological mechanism of its most appropriate targeted medical treatment.

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Items

An inpatient psychiatric unit requests a consultation for a 29-year-old male who developed a sustained, painful upward deviation of his eyes and severe neck spasms shortly after receiving intramuscular haloperidol.
During a routine follow-up, a 36-year-old female treated with aripiprazole reports an intense, distressing sensation of inner restlessness and is unable to stop pacing the examination room.
A 55-year-old male with a twenty-year history of typical antipsychotic exposure presents with newly onset, involuntary chewing motions, lip-smacking, and choreoathetoid movements of his fingers.
Emergency responders bring in a 31-year-old female on high-dose fluphenazine who exhibits profound altered sensorium, generalized lead-pipe muscle rigidity, diaphoresis, and a temperature of 40.1°C (104.2°F).

Matches

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Answer

Acute dystonia matches with muscarinic cholinergic receptor antagonism; akathisia matches with beta-adrenergic receptor antagonism; tardive dyskinesia matches with reversible inhibition of the vesicular monoamine transporter 2; and neuroleptic malignant syndrome matches with direct agonism of central dopamine receptors.
Each pair correctly links the specific extrapyramidal or systemic side effect of antipsychotic therapy to the mechanism of action of its definitive or first-line pharmacological treatment.

Step-by-Step Solution

1
Diagnose the clinical presentation in the first vignette.
The acute onset of sustained muscle contractions (oculogyric crisis) following haloperidol administration represents acute dystonia.
Identifying the specific extrapyramidal symptom is necessary to select the correct counteracting pharmacological mechanism.
2
Identify the treatment mechanism for acute dystonia.
Acute dystonia is treated with benztropine or diphenhydramine, which provide muscarinic cholinergic receptor antagonism.
Anticholinergics restore the striatal balance between dopamine (which is blocked by the antipsychotic) and acetylcholine.
3
Evaluate the subsequent vignettes for diagnosis and targeted treatment mechanism.
Akathisia is treated with propranolol (beta-blocker); Tardive dyskinesia is treated with valbenazine (VMAT2 inhibitor); Neuroleptic malignant syndrome is treated with bromocriptine (dopamine agonist) or dantrolene.
A two-step clinical reasoning process is required: identifying the specific medication-induced movement disorder, followed by determining the precise mechanism of action of its first-line antidote.

Key Concept

Management of antipsychotic adverse effects requires diagnosing the specific extrapyramidal or systemic symptom and selecting the appropriate targeted counteracting pharmacological mechanism.
Question 180Question →

A 34-year-old man comes to the psychiatry clinic reporting a 6-week history of worsening depressed mood, anhedonia, and profound fatigue. He states he is sleeping up to 14 hours a day and has gained 6 kg (13.2 lb) during this period. The patient has a history of a seizure disorder that has been well controlled on carbamazepine for the past 8 years. Five years ago, he was prescribed sertraline by his primary care physician for a depressive episode; three weeks later, he developed grandiosity, decreased need for sleep, pressured speech, and reckless spending. This resulted in a psychiatric hospitalization. He required inpatient observation and treatment with antipsychotics for 3 weeks, long after the sertraline was discontinued, before his symptoms fully resolved. He has not taken any psychiatric medications since that time. Vital signs are within normal limits. Physical examination reveals no abnormalities. Serum chemistry panel, complete blood count, and thyroid-stimulating hormone (TSH) levels are within normal reference ranges. Which of the following is the most appropriate next step in the pharmacologic management of this patient's current symptoms?

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Answer: Add lithium

Answer

The most appropriate next step is to add lithium, as it effectively treats bipolar depression without interacting with the patient's carbamazepine regimen.
This patient is experiencing an acute depressive episode in the context of Bipolar I disorder. His past manic episode (grandiosity, decreased sleep, pressured speech, hospitalization) emerged during SSRI treatment but persisted fully syndromal well beyond the physiological effect of the drug, confirming a Bipolar I diagnosis. First-line treatments for bipolar depression include lithium, lamotrigine, quetiapine, and lurasidone. However, this patient is taking carbamazepine, a potent inducer of several cytochrome P450 enzymes (particularly CYP3A4). Lithium is the most appropriate choice because it undergoes direct renal excretion and has no clinically significant pharmacokinetic interactions with hepatic CYP450 inducers.

Step-by-Step Solution

1
Diagnose the patient's underlying psychiatric condition based on past history.
Bipolar I Disorder.
The patient experienced a full manic episode during SSRI treatment that persisted at a fully syndromal level well beyond the physiological effect of the drug (requiring 3 weeks of inpatient antipsychotic treatment). According to DSM-5, this confirms Bipolar I Disorder.
2
Identify the current clinical episode.
Acute bipolar depression.
The patient presents with a 6-week history of depressed mood, anhedonia, hypersomnia, and weight gain.
3
Determine appropriate first-line treatments for acute bipolar depression.
Lithium, quetiapine, lurasidone, or lamotrigine.
These agents have demonstrated efficacy in treating the depressive phase of bipolar disorder without high risks of inducing mania.
4
Evaluate pharmacokinetic interactions with the patient's existing medication (carbamazepine).
Carbamazepine is a potent inducer of hepatic CYP3A4.
Quetiapine and lurasidone are heavily metabolized by CYP3A4. Their serum levels will be drastically reduced by carbamazepine (lurasidone is explicitly contraindicated). Lithium is renally cleared and bypasses the hepatic CYP450 system entirely, making it the safest and most effective choice.

Key Concept

Pharmacologic management of acute bipolar depression requires navigating drug-drug interactions; lithium is renally cleared and unaffected by potent hepatic CYP450 inducers like carbamazepine, unlike lurasidone or quetiapine.
Estimated Time:2m 0s
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