BARKLEY PMHNP CERTIFICATION EXAMINATION
— ADVANCED CLINICAL PROFICIENCY
ASSESSMENT HIGHYIELD QUESTIONS WITH
CORRECT ANSWERS– GUARANTEED PASS
SECTION 1: NEUROBIOLOGY & PSYCHOPHARMACOLOGY
(Questions 1-40)
1. A patient with schizophrenia has been on haloperidol for 6 months and now
presents with tongue protrusion, lip smacking, and choreiform movements. What
is the most likely diagnosis?
A) Acute dystonia
B) Parkinsonism
C) Tardive dyskinesia
D) Neuroleptic malignant syndrome
Correct Answer: C) Tardive dyskinesia
Rationale: Tardive dyskinesia is a late-onset movement disorder characterized by
involuntary choreoathetoid movements of the tongue, face, and extremities. It typically
occurs after months to years of antipsychotic exposure. Acute dystonia occurs early (hours
to days), Parkinsonism presents with rigidity/bradykinesia, and NMS presents with fever,
rigidity, and autonomic instability.
,2. Which neurotransmitter receptor is most associated with weight gain and
metabolic side effects of atypical antipsychotics?
A) D2 receptor
B) 5-HT2A receptor
C) H1 receptor
D) M1 receptor
Correct Answer: C) H1 receptor
Rationale: Histamine H1 receptor antagonism is strongly associated with weight gain,
sedation, and somnolence. While 5-HT2A blockade may contribute to weight effects, H1
antagonism is the primary driver of metabolic side effects. D2 blockade causes EPS, and
M1 blockade causes anticholinergic effects.
3. A patient on clozapine develops fever, malaise, and pharyngitis. CBC shows WBC
2,500/mm³ with ANC 1,200/mm³. What is the appropriate next step?
A) Continue clozapine and monitor weekly
B) Reduce clozapine dose by 50%
C) Immediately discontinue clozapine and start G-CSF
D) Add lithium to boost WBC count
Correct Answer: C) Immediately discontinue clozapine and start G-CSF
Rationale: Clozapine-induced agranulocytosis is a life-threatening emergency. With ANC
< 500/mm³, clozapine must be immediately discontinued, and G-CSF should be initiated.
This patient's ANC is 1,200 (mild neutropenia), which requires holding clozapine and
monitoring; however, the scenario indicates progression toward agranulocytosis, making
discontinuation the correct emergency response.
,4. Which of the following CYP450 enzymes is primarily responsible for
metabolizing fluoxetine?
A) CYP1A2
B) CYP2D6
C) CYP3A4
D) CYP2C19
Correct Answer: B) CYP2D6
Rationale: Fluoxetine is a potent inhibitor of CYP2D6 and is primarily metabolized by
CYP2D6 to its active metabolite norfluoxetine. This inhibition can lead to significant drug
interactions with other CYP2D6 substrates such as risperidone, haloperidol, and tricyclic
antidepressants.
5. A patient with bipolar disorder on lithium presents with coarse tremors, nausea,
vomiting, and confusion. Serum lithium level is 2.5 mEq/L. What is the most
appropriate next step?
A) Increase lithium dose to achieve therapeutic level
B) Administer activated charcoal
C) Hold lithium, assess renal function, and consider hemodialysis
D) Add a beta-blocker for tremor control
Correct Answer: C) Hold lithium, assess renal function, and consider hemodialysis
Rationale: Lithium toxicity occurs at levels > 1.5 mEq/L. At 2.5 mEq/L with severe
symptoms (confusion, vomiting), this is a medical emergency. Lithium is not bound to
, charcoal. Hemodialysis is indicated for severe toxicity (levels > 2.5 or with neurological
symptoms). Renal function must be assessed.
6. Which atypical antipsychotic has the lowest risk of extrapyramidal symptoms
(EPS)?
A) Risperidone
B) Olanzapine
C) Aripiprazole
D) Quetiapine
Correct Answer: D) Quetiapine
Rationale: Quetiapine has the lowest EPS risk among atypical antipsychotics due to its low
D2 receptor occupancy and rapid dissociation from D2 receptors. Risperidone has higher
EPS risk at doses > 6 mg/day. Olanzapine and aripiprazole have moderate EPS risk.
7. A patient on sertraline for 4 weeks reports improved mood but persistent
insomnia. What is the best management strategy?
A) Increase sertraline dose
B) Switch to fluoxetine
C) Administer sertraline in the morning
D) Add trazodone at bedtime
Correct Answer: C) Administer sertraline in the morning
— ADVANCED CLINICAL PROFICIENCY
ASSESSMENT HIGHYIELD QUESTIONS WITH
CORRECT ANSWERS– GUARANTEED PASS
SECTION 1: NEUROBIOLOGY & PSYCHOPHARMACOLOGY
(Questions 1-40)
1. A patient with schizophrenia has been on haloperidol for 6 months and now
presents with tongue protrusion, lip smacking, and choreiform movements. What
is the most likely diagnosis?
A) Acute dystonia
B) Parkinsonism
C) Tardive dyskinesia
D) Neuroleptic malignant syndrome
Correct Answer: C) Tardive dyskinesia
Rationale: Tardive dyskinesia is a late-onset movement disorder characterized by
involuntary choreoathetoid movements of the tongue, face, and extremities. It typically
occurs after months to years of antipsychotic exposure. Acute dystonia occurs early (hours
to days), Parkinsonism presents with rigidity/bradykinesia, and NMS presents with fever,
rigidity, and autonomic instability.
,2. Which neurotransmitter receptor is most associated with weight gain and
metabolic side effects of atypical antipsychotics?
A) D2 receptor
B) 5-HT2A receptor
C) H1 receptor
D) M1 receptor
Correct Answer: C) H1 receptor
Rationale: Histamine H1 receptor antagonism is strongly associated with weight gain,
sedation, and somnolence. While 5-HT2A blockade may contribute to weight effects, H1
antagonism is the primary driver of metabolic side effects. D2 blockade causes EPS, and
M1 blockade causes anticholinergic effects.
3. A patient on clozapine develops fever, malaise, and pharyngitis. CBC shows WBC
2,500/mm³ with ANC 1,200/mm³. What is the appropriate next step?
A) Continue clozapine and monitor weekly
B) Reduce clozapine dose by 50%
C) Immediately discontinue clozapine and start G-CSF
D) Add lithium to boost WBC count
Correct Answer: C) Immediately discontinue clozapine and start G-CSF
Rationale: Clozapine-induced agranulocytosis is a life-threatening emergency. With ANC
< 500/mm³, clozapine must be immediately discontinued, and G-CSF should be initiated.
This patient's ANC is 1,200 (mild neutropenia), which requires holding clozapine and
monitoring; however, the scenario indicates progression toward agranulocytosis, making
discontinuation the correct emergency response.
,4. Which of the following CYP450 enzymes is primarily responsible for
metabolizing fluoxetine?
A) CYP1A2
B) CYP2D6
C) CYP3A4
D) CYP2C19
Correct Answer: B) CYP2D6
Rationale: Fluoxetine is a potent inhibitor of CYP2D6 and is primarily metabolized by
CYP2D6 to its active metabolite norfluoxetine. This inhibition can lead to significant drug
interactions with other CYP2D6 substrates such as risperidone, haloperidol, and tricyclic
antidepressants.
5. A patient with bipolar disorder on lithium presents with coarse tremors, nausea,
vomiting, and confusion. Serum lithium level is 2.5 mEq/L. What is the most
appropriate next step?
A) Increase lithium dose to achieve therapeutic level
B) Administer activated charcoal
C) Hold lithium, assess renal function, and consider hemodialysis
D) Add a beta-blocker for tremor control
Correct Answer: C) Hold lithium, assess renal function, and consider hemodialysis
Rationale: Lithium toxicity occurs at levels > 1.5 mEq/L. At 2.5 mEq/L with severe
symptoms (confusion, vomiting), this is a medical emergency. Lithium is not bound to
, charcoal. Hemodialysis is indicated for severe toxicity (levels > 2.5 or with neurological
symptoms). Renal function must be assessed.
6. Which atypical antipsychotic has the lowest risk of extrapyramidal symptoms
(EPS)?
A) Risperidone
B) Olanzapine
C) Aripiprazole
D) Quetiapine
Correct Answer: D) Quetiapine
Rationale: Quetiapine has the lowest EPS risk among atypical antipsychotics due to its low
D2 receptor occupancy and rapid dissociation from D2 receptors. Risperidone has higher
EPS risk at doses > 6 mg/day. Olanzapine and aripiprazole have moderate EPS risk.
7. A patient on sertraline for 4 weeks reports improved mood but persistent
insomnia. What is the best management strategy?
A) Increase sertraline dose
B) Switch to fluoxetine
C) Administer sertraline in the morning
D) Add trazodone at bedtime
Correct Answer: C) Administer sertraline in the morning
