- Which of the following is the most appropriate immediate treatment?
Answer: Intramuscular benztropine
The patient is experiencing an acute dystonic reaction, a type of extrapyramidal side effect (EPS) common with high-potency first-generation antipsychotics like haloperidol. The symptoms include oculogyric crisis (upward eye deviation) and torticollis (neck twisting). The treatment of choice is an intramuscular injection of an anticholinergic agent like benztropine or an antihistamine with anticholinergic properties like diphenhydramine, which provides rapid relief.
* Lorazepam can help with associated anxiety but is not the primary treatment.
* Propranolol is used to treat akathisia, another form of EPS.
* Discontinuing haloperidol is a long-term consideration, but the acute, painful reaction requires immediate pharmacologic intervention.
- Which of the following is the most appropriate initial pharmacologic treatment for this patient's symptoms?
Answer: Propranolol
This patient is describing akathisia, an extrapyramidal side effect characterized by a subjective feeling of inner restlessness and objective signs of repetitive movements. It is a common side effect of many antipsychotics. The first-line treatment for akathisia is to reduce the dose of the offending agent if possible. If not, the most effective pharmacologic treatments are beta-blockers (e.g., propranolol), followed by benzodiazepines or anticholinergics.
* Benztropine is more effective for dystonia and parkinsonism than for akathisia.
* Cyproheptadine is used for serotonin syndrome.
* Amantadine is sometimes used for drug-induced parkinsonism.
- Which of the following screening tests is most important to perform at this time?
Answer: Fasting lipid panel and HbA1c
Second-generation antipsychotics, particularly olanzapine and clozapine, are associated with a high risk of metabolic syndrome, which includes weight gain, dyslipidemia, hyperglycemia, and hypertension. Given this patient's significant weight gain and elevated blood pressure, it is essential to screen for the other components of metabolic syndrome by checking a fasting lipid panel and a hemoglobin A1c (or fasting glucose).
* Serum prolactin is more commonly elevated with agents like risperidone and paliperidone.
* Complete blood count is not part of routine metabolic monitoring.
* An ECG is important to obtain at baseline and periodically for QTc monitoring, but the immediate concern raised by the vignette is metabolic syndrome.
- Which of the following is the most appropriate next step to evaluate her symptoms?
Answer: Obtain a serum prolactin level
The patient's symptoms of amenorrhea and galactorrhea are highly suggestive of hyperprolactinemia, a common side effect of antipsychotics that are potent dopamine D2 receptor antagonists, such as paliperidone and risperidone. The first step in the workup is to confirm the diagnosis by measuring a serum prolactin level.
* Switching the medication is a potential management step but should be done only after confirming the diagnosis and considering the risks/benefits.
* Reassurance is not appropriate without first confirming the cause and discussing the implications (e.g., risk of osteoporosis).
* A pituitary MRI would be considered if the prolactin level is extremely high or if a prolactinoma is suspected, but it is not the initial step.
- The patient's acute change in mental status is most likely due to which of the following?
Answer: Delirium secondary to an infection
This patient's acute onset of altered mental status, fluctuating course, and attentional deficits, superimposed on a chronic dementia, is characteristic of delirium. The presence of fever, tachycardia, and hypotension strongly suggests an underlying medical cause, such as a urinary tract infection or pneumonia. Differentiating primary psychosis from psychosis secondary to a medical condition is crucial.
* Progression of dementia is typically gradual, not acute over one day.
* Late-onset schizophrenia is rare and would not explain the fluctuating consciousness or vital sign abnormalities.
* Anticholinergic toxicity is a possible cause of delirium, but the signs of infection make it the most likely etiology in this case.
- Which of the following adverse effects necessitates weekly blood monitoring for the first six months of clozapine therapy?
Answer: Agranulocytosis
Clozapine carries a risk of severe neutropenia, including agranulocytosis, which can be fatal. Due to this risk, patients taking clozapine must be enrolled in a Risk Evaluation and Mitigation Strategy (REMS) program that requires regular monitoring of the absolute neutrophil count (ANC). Monitoring is weekly for the first 6 months, then bi-weekly for the next 6 months, and monthly thereafter.
* Metabolic syndrome is a significant risk with clozapine, but monitoring involves periodic checks of weight, glucose, and lipids, not weekly blood draws.
* Myocarditis is a rare but serious side effect, especially in the first month, but is monitored for clinically (fever, chest pain) and with inflammatory markers if suspected, not with routine weekly blood tests.
* Prolonged QTc interval is a risk with many antipsychotics, monitored with a baseline and periodic ECG.
- Which of the following is the most appropriate next step in management?
Answer: Initiate treatment with a VMAT2 inhibitor like valbenazine
This patient is presenting with classic signs of tardive dyskinesia (TD), a potentially irreversible movement disorder caused by long-term exposure to dopamine-blocking agents. Management involves discontinuing the offending agent if possible and switching to an antipsychotic with lower TD risk (like clozapine). If symptoms persist or the antipsychotic cannot be stopped, the treatment of choice is a vesicular monoamine transporter 2 (VMAT2) inhibitor, such as valbenazine or deutetrabenazine.
* Increasing the antipsychotic dose can temporarily mask TD but ultimately worsens the underlying pathology.
* Adding benztropine or other anticholinergics can worsen TD.
* Reassurance is inappropriate as TD can be disfiguring, distressing, and is not always self-limiting.
- Which of the following is the most appropriate next step in management?
Answer: Administer olanzapine intramuscularly
In an acutely agitated and psychotic patient who is uncooperative with oral medication, the standard of care is rapid tranquilization with an intramuscular antipsychotic. A second-generation antipsychotic like olanzapine or ziprasidone, or a first-generation agent like haloperidol, is effective and appropriate. This allows for rapid control of agitation and psychosis.
* Administering lorazepam orally is not feasible as the patient is refusing oral medications.
* Applying physical restraints may be necessary for safety but should be used in conjunction with pharmacologic intervention. Medication is the primary treatment for the underlying psychosis and agitation.
* Obtaining a head CT scan is not the immediate priority. The patient's agitation must be controlled first, and his presentation is consistent with an exacerbation of his known schizophrenia.
- Which of the following is the most appropriate next step in pharmacologic management?
Answer: Switch to clozapine
This patient has treatment-resistant schizophrenia (TRS), which is defined as a failure to respond to at least two adequate trials of different antipsychotic medications. Clozapine is the only medication with proven efficacy for TRS and is the standard of care in this situation.
* Adding lithium or an antidepressant is not an evidence-based strategy for refractory positive symptoms of schizophrenia.
* Switching to haloperidol decanoate is unlikely to be effective, as he has already failed to respond to two different classes of antipsychotics, and switching to another typical or atypical agent (other than clozapine) has a low probability of success.
- Which of the following is the most critical initial step in this patient's management?
Answer: Discontinue fluphenazine immediately
This patient's presentation of fever, autonomic instability (hypertension, tachycardia), altered mental status, and severe muscle rigidity ('lead-pipe') in the setting of recent antipsychotic initiation is classic for Neuroleptic Malignant Syndrome (NMS), a medical emergency. The single most important first step is to discontinue the offending antipsychotic agent. This is followed by aggressive supportive care (IV fluids, cooling blankets) and consideration of specific treatments like dantrolene or bromocriptine.
* Administering dantrolene is an appropriate treatment, but only after the offending agent has been stopped.
* While the presentation can mimic meningitis, the pronounced rigidity and extremely high CK make NMS far more likely, and stopping the drug is the priority.
* Antibiotics might be considered, but the primary diagnosis is NMS.
- The patient's psychotic symptoms are most likely caused by intoxication with which of the following substances?
Answer: Methamphetamine
This clinical picture is classic for methamphetamine-induced psychosis. Key features include paranoia, agitation, sympathetic hyperactivity (tachycardia, hypertension, mydriasis, diaphoresis), and tactile hallucinations (formication, or the sensation of bugs crawling on the skin). The skin excoriations from picking at these perceived bugs and the poor dental hygiene ('meth mouth') are also highly suggestive.
* Alcohol intoxication typically causes sedation, while withdrawal can cause hallucinations, but the overall picture is less consistent.
* Heroin (an opioid) causes miosis (constricted pupils) and CNS depression.
* Cannabis can induce psychosis, but it is less likely to cause such profound sympathetic stimulation and formication.
- In addition to a comprehensive psychiatric history, which of the following is the most important initial step in the diagnostic workup?
Answer: Urine toxicology screen and basic metabolic panel
For any patient presenting with a first episode of psychosis, it is crucial to rule out medical and substance-induced causes. A standard initial workup includes a complete physical and neurologic exam, basic laboratory tests (e.g., CBC, electrolytes, BUN, creatinine, LFTs, TSH), and a urine toxicology screen to rule out substance-induced psychotic disorder. This ensures that a treatable underlying condition is not missed before diagnosing a primary psychotic disorder.
* An EEG or lumbar puncture would be indicated if there were specific signs suggesting a seizure disorder or CNS infection, which are not present here.
* Genetic testing is not part of the routine clinical workup for schizophrenia.
- Which of the following interventions would be most effective in reducing this patient's risk of relapse?
Answer: Initiating a long-acting injectable antipsychotic
For patients with schizophrenia who have a history of nonadherence to oral medication, long-acting injectable (LAI) antipsychotics are the most effective strategy for improving adherence and reducing relapse rates. An LAI, such as paliperidone palmitate or aripiprazole lauroxil, is administered every few weeks to months, bypassing the need for daily oral dosing.
* Switching to oral clozapine is indicated for treatment-resistant schizophrenia, not nonadherence.
* Adding a benzodiazepine does not address the core issue of antipsychotic nonadherence.
* Group therapy can be a useful adjunct, but it is less effective than an LAI for solving the specific problem of medication nonadherence.
- What is the most likely diagnosis?
Answer: Delusional disorder
This patient's presentation is classic for delusional disorder. The key features are one or more non-bizarre delusions (in this case, jealous type) that persist for at least one month, without the other psychotic symptoms seen in schizophrenia (e.g., hallucinations, disorganized speech). Crucially, functioning outside the impact of the delusion is not markedly impaired.
* Schizophrenia is incorrect because the patient lacks other Criterion A symptoms and his overall functioning is not significantly impaired.
* Paranoid personality disorder involves a pervasive distrust and suspiciousness of others, but not a fixed, false belief of this magnitude.
* Schizoaffective disorder is incorrect as there are no mood episodes or other psychotic symptoms.
- Which of the following is the most appropriate management step?
Answer: Add an anticholinergic agent such as benztropine
The patient is exhibiting signs of drug-induced parkinsonism, a common extrapyramidal side effect of antipsychotics with potent D2 receptor blockade, like risperidone. The symptoms include bradykinesia, rigidity, and tremor. The most appropriate management options are to lower the dose of the antipsychotic, switch to an agent with a lower risk of EPS (e.g., quetiapine), or add an anticholinergic medication like benztropine or amantadine. Adding benztropine is a common and effective initial strategy.
* Levodopa/carbidopa is used for Parkinson's disease and can worsen psychosis.
* Increasing the risperidone dose would worsen the parkinsonian symptoms.
* A brain MRI is not indicated as the clinical picture is highly suggestive of a medication side effect, not a new neurologic event.
- What is the most likely diagnosis?
Answer: Schizophrenia
The patient's presentation of positive symptoms (delusions, auditory hallucinations), negative symptoms (flat affect, social withdrawal), and disorganized thought/speech, coupled with a significant decline in functioning for a duration of 8 months, meets the DSM-5 criteria for schizophrenia. The symptoms must be present for at least 6 months for this diagnosis.
* Brief psychotic disorder is incorrect because the symptoms have lasted for more than one month.
* Schizophreniform disorder is incorrect because the symptoms have lasted for more than six months.
* Schizoaffective disorder is incorrect as there is no mention of a major depressive or manic episode occurring concurrently with the psychotic symptoms.
- What is the most likely diagnosis?
Answer: Schizoaffective disorder
Schizoaffective disorder is diagnosed when a patient meets the criteria for a major mood episode (depressive or manic) that occurs concurrently with the active-phase symptoms of schizophrenia. The key diagnostic feature is the presence of delusions or hallucinations for at least 2 weeks in the absence of a major mood episode during the lifetime duration of the illness. This patient has persistent psychosis with a superimposed major depressive episode, fitting the criteria for schizoaffective disorder.
* Major depressive disorder with psychotic features is incorrect because the psychosis persists even when the mood episode resolves.
* Bipolar I disorder with psychotic features is incorrect for the same reason, and there is no evidence of a manic episode.
* Schizophrenia is incorrect because the mood symptoms are prominent and meet the criteria for a full major depressive episode.
- What is the most likely diagnosis?
Answer: Brief psychotic disorder
The patient's acute onset of psychotic symptoms (hallucinations, disorganized speech) lasting for 2 weeks in the context of a significant psychosocial stressor is characteristic of brief psychotic disorder. By definition, the symptoms last from one day to one month, with an eventual full return to premorbid functioning.
* Schizophrenia and schizophreniform disorder are incorrect due to the short duration of symptoms (less than 6 months and 1 month, respectively).
* Acute stress disorder involves intrusive symptoms, avoidance, and hyperarousal following a traumatic event, but does not typically include prominent psychotic symptoms like hallucinations and disorganized speech.
- Which of the following is the most effective intervention for these persistent symptoms?
Answer: Implementing a psychosocial intervention like social skills training
While antipsychotic medications are effective for the positive symptoms of schizophrenia, they have limited efficacy for negative symptoms (avolition, anhedonia, flat affect, etc.). Evidence-based psychosocial interventions, such as social skills training, supported employment, and cognitive-behavioral therapy for psychosis, are the most effective treatments for improving functional outcomes and addressing persistent negative symptoms.
* Increasing the risperidone dose is unlikely to help with negative symptoms and may worsen them or cause side effects.
* Adding benztropine would only be indicated for extrapyramidal symptoms, not primary negative symptoms.
* Switching to a first-generation antipsychotic is generally associated with worse negative symptoms compared to second-generation agents.
- What is the most likely diagnosis?
Answer: Schizophreniform disorder
This patient presents with classic symptoms of psychosis, including delusions and hallucinations, along with a decline in functioning. The key diagnostic feature is the duration of symptoms. Schizophreniform disorder is diagnosed when symptoms last between one and six months. Since her symptoms have been present for 3 months, this is the most fitting diagnosis.
* Schizophrenia is incorrect because the diagnostic criteria require a duration of at least six months.
* Brief psychotic disorder is incorrect because symptoms last for less than one month.
* Delusional disorder is incorrect because the patient exhibits hallucinations and a significant decline in functioning, which are not characteristic of delusional disorder.
