Walden University NRNP 6635 Psychopathology and
Diagnostic Reasoning – NRNP 6635 Study Guide, Original
Practice Questions & Answers, Comprehensive PMHNP
Exam Preparation, Psychopathology Review, Psychiatric
Assessment, Mental Status Examination, DSM-5-TR,
Diagnostic Reasoning, Differential Diagnosis, Diagnostic
Formulation, Neurobiology, Mood Disorders, Anxiety
Disorders, Psychotic Disorders, Trauma-Related Disorders,
Substance Use Disorders, Neurodevelopmental Disorders,
Neurocognitive Disorders, Personality Disorders & Clinical
Decision-Making
Question 1: A 45-year-old patient presents with a 6-month history of low
mood, anhedonia, and fatigue. Symptoms began after a stressful job loss.
Which component of the mental status exam is most directly assessed by
noting the patient's slumped posture and lack of eye contact?
A. Thought content
B. Psychomotor behavior
C. Insight
D. Sensorium
CORRECT ANSWER: B. Psychomotor behavior
Rationale: Psychomotor behavior includes posture, eye contact, and motor activity.
Slumped posture and poor eye contact are objective observations of psychomotor
changes commonly seen in depression. Thought content refers to what the patient is
thinking, insight refers to awareness of illness, and sensorium refers to level of
consciousness and orientation .
Question 2: Which ethical principle is most relevant when a psychiatric nurse
practitioner prescribes a medication with known side effects that may impair a
patient's driving ability without discussing it?
A. Beneficence
B. Nonmaleficence
C. Autonomy
D. Justice
CORRECT ANSWER: C. Autonomy
Rationale: Autonomy respects the patient's right to make informed decisions about
their care. Failing to discuss significant side effects violates this principle by withholding
information necessary for the patient to make an informed choice. Beneficence involves
acting in the patient's best interest, nonmaleficence means avoiding harm, and justice
concerns fairness in treatment distribution .
Question 3: Which of the following is the most common cause of intellectual
disability attributed to a specific gene in infants and children?
,A. Fragile X syndrome
B. Phenylketonuria
C. Down syndrome
D. Rett syndrome
CORRECT ANSWER: C. Down syndrome
Rationale: Down syndrome, caused by trisomy 21, is the most frequent genetic cause
of intellectual disability in infants and children. Fragile X syndrome is the most common
inherited cause, but Down syndrome has higher overall prevalence .
Question 4: Which neurotransmitter is primarily implicated in the
pathophysiology of depressive disorders?
A. Dopamine
B. GABA
C. Serotonin
D. Acetylcholine
CORRECT ANSWER: C. Serotonin
Rationale: Serotonin dysregulation is a core mechanism in depressive disorders. The
monoamine hypothesis suggests that decreased serotonin availability contributes to
mood disturbances, sleep changes, and appetite alterations seen in depression. While
dopamine and norepinephrine are also involved, serotonin is the primary
neurotransmitter implicated .
Question 5: A patient presents with a fear of scrutiny by others in social
situations that has lasted for 8 months. What is the most likely diagnosis?
A. Agoraphobia
B. Generalized Anxiety Disorder
C. Panic Disorder
D. Social Anxiety Disorder
CORRECT ANSWER: D. Social Anxiety Disorder
Rationale: Social Anxiety Disorder involves a persistent fear of one or more social or
performance situations in which the person is exposed to unfamiliar people or to
possible scrutiny. The symptoms must persist for at least six months to meet DSM-5-TR
criteria .
Question 6: A 25-year-old female reports recurrent intrusive thoughts and
compulsive handwashing. What is the most likely diagnosis?
A. Post-Traumatic Stress Disorder
B. Obsessive-Compulsive Disorder
C. Generalized Anxiety Disorder
D. Social Anxiety Disorder
CORRECT ANSWER: B. Obsessive-Compulsive Disorder
, Rationale: Intrusive thoughts (obsessions) and repetitive behaviors (compulsions) such
as handwashing are diagnostic for Obsessive-Compulsive Disorder (OCD) according to
DSM-5-TR criteria. These symptoms cause significant distress and are time-consuming .
Question 7: Which medication class is considered first-line treatment for
Obsessive-Compulsive Disorder (OCD)?
A. Benzodiazepines
B. SSRIs
C. Antipsychotics
D. Mood Stabilizers
CORRECT ANSWER: B. SSRIs
Rationale: Selective Serotonin Reuptake Inhibitors (SSRIs) are first-line for OCD due to
serotonin modulation in the brain circuits implicated in the disorder. They have
demonstrated efficacy and a favorable side effect profile compared to other classes .
Question 8: What is the hallmark feature of schizophrenia?
A. Disorganized speech
B. Hallucinations
C. Negative symptoms
D. Cognitive impairment
CORRECT ANSWER: B. Hallucinations
Rationale: Hallucinations, particularly auditory, are a hallmark of schizophrenia. DSM-5
requires two or more symptoms (hallucinations, delusions, disorganized speech,
disorganized behavior, negative symptoms) for at least 6 months. While negative
symptoms and cognitive impairment are common, hallucinations are a key positive
symptom .
Question 9: Which neurobiological pathway is primarily associated with the
positive symptoms of Schizophrenia?
A. Mesocortical pathway
B. Nigrostriatal pathway
C. Tuberoinfundibular pathway
D. Mesolimbic pathway
CORRECT ANSWER: D. Mesolimbic pathway
Rationale: The mesolimbic dopamine pathway is believed to be overactive in patients
with schizophrenia, leading to positive symptoms such as hallucinations and delusions.
Most antipsychotic medications aim to block D2 receptors in this pathway to alleviate
these symptoms .
Question 10: A patient exhibits a pattern of instability in interpersonal
relationships, self-image, and affects, along with marked impulsivity. This is
most consistent with which personality disorder?
Diagnostic Reasoning – NRNP 6635 Study Guide, Original
Practice Questions & Answers, Comprehensive PMHNP
Exam Preparation, Psychopathology Review, Psychiatric
Assessment, Mental Status Examination, DSM-5-TR,
Diagnostic Reasoning, Differential Diagnosis, Diagnostic
Formulation, Neurobiology, Mood Disorders, Anxiety
Disorders, Psychotic Disorders, Trauma-Related Disorders,
Substance Use Disorders, Neurodevelopmental Disorders,
Neurocognitive Disorders, Personality Disorders & Clinical
Decision-Making
Question 1: A 45-year-old patient presents with a 6-month history of low
mood, anhedonia, and fatigue. Symptoms began after a stressful job loss.
Which component of the mental status exam is most directly assessed by
noting the patient's slumped posture and lack of eye contact?
A. Thought content
B. Psychomotor behavior
C. Insight
D. Sensorium
CORRECT ANSWER: B. Psychomotor behavior
Rationale: Psychomotor behavior includes posture, eye contact, and motor activity.
Slumped posture and poor eye contact are objective observations of psychomotor
changes commonly seen in depression. Thought content refers to what the patient is
thinking, insight refers to awareness of illness, and sensorium refers to level of
consciousness and orientation .
Question 2: Which ethical principle is most relevant when a psychiatric nurse
practitioner prescribes a medication with known side effects that may impair a
patient's driving ability without discussing it?
A. Beneficence
B. Nonmaleficence
C. Autonomy
D. Justice
CORRECT ANSWER: C. Autonomy
Rationale: Autonomy respects the patient's right to make informed decisions about
their care. Failing to discuss significant side effects violates this principle by withholding
information necessary for the patient to make an informed choice. Beneficence involves
acting in the patient's best interest, nonmaleficence means avoiding harm, and justice
concerns fairness in treatment distribution .
Question 3: Which of the following is the most common cause of intellectual
disability attributed to a specific gene in infants and children?
,A. Fragile X syndrome
B. Phenylketonuria
C. Down syndrome
D. Rett syndrome
CORRECT ANSWER: C. Down syndrome
Rationale: Down syndrome, caused by trisomy 21, is the most frequent genetic cause
of intellectual disability in infants and children. Fragile X syndrome is the most common
inherited cause, but Down syndrome has higher overall prevalence .
Question 4: Which neurotransmitter is primarily implicated in the
pathophysiology of depressive disorders?
A. Dopamine
B. GABA
C. Serotonin
D. Acetylcholine
CORRECT ANSWER: C. Serotonin
Rationale: Serotonin dysregulation is a core mechanism in depressive disorders. The
monoamine hypothesis suggests that decreased serotonin availability contributes to
mood disturbances, sleep changes, and appetite alterations seen in depression. While
dopamine and norepinephrine are also involved, serotonin is the primary
neurotransmitter implicated .
Question 5: A patient presents with a fear of scrutiny by others in social
situations that has lasted for 8 months. What is the most likely diagnosis?
A. Agoraphobia
B. Generalized Anxiety Disorder
C. Panic Disorder
D. Social Anxiety Disorder
CORRECT ANSWER: D. Social Anxiety Disorder
Rationale: Social Anxiety Disorder involves a persistent fear of one or more social or
performance situations in which the person is exposed to unfamiliar people or to
possible scrutiny. The symptoms must persist for at least six months to meet DSM-5-TR
criteria .
Question 6: A 25-year-old female reports recurrent intrusive thoughts and
compulsive handwashing. What is the most likely diagnosis?
A. Post-Traumatic Stress Disorder
B. Obsessive-Compulsive Disorder
C. Generalized Anxiety Disorder
D. Social Anxiety Disorder
CORRECT ANSWER: B. Obsessive-Compulsive Disorder
, Rationale: Intrusive thoughts (obsessions) and repetitive behaviors (compulsions) such
as handwashing are diagnostic for Obsessive-Compulsive Disorder (OCD) according to
DSM-5-TR criteria. These symptoms cause significant distress and are time-consuming .
Question 7: Which medication class is considered first-line treatment for
Obsessive-Compulsive Disorder (OCD)?
A. Benzodiazepines
B. SSRIs
C. Antipsychotics
D. Mood Stabilizers
CORRECT ANSWER: B. SSRIs
Rationale: Selective Serotonin Reuptake Inhibitors (SSRIs) are first-line for OCD due to
serotonin modulation in the brain circuits implicated in the disorder. They have
demonstrated efficacy and a favorable side effect profile compared to other classes .
Question 8: What is the hallmark feature of schizophrenia?
A. Disorganized speech
B. Hallucinations
C. Negative symptoms
D. Cognitive impairment
CORRECT ANSWER: B. Hallucinations
Rationale: Hallucinations, particularly auditory, are a hallmark of schizophrenia. DSM-5
requires two or more symptoms (hallucinations, delusions, disorganized speech,
disorganized behavior, negative symptoms) for at least 6 months. While negative
symptoms and cognitive impairment are common, hallucinations are a key positive
symptom .
Question 9: Which neurobiological pathway is primarily associated with the
positive symptoms of Schizophrenia?
A. Mesocortical pathway
B. Nigrostriatal pathway
C. Tuberoinfundibular pathway
D. Mesolimbic pathway
CORRECT ANSWER: D. Mesolimbic pathway
Rationale: The mesolimbic dopamine pathway is believed to be overactive in patients
with schizophrenia, leading to positive symptoms such as hallucinations and delusions.
Most antipsychotic medications aim to block D2 receptors in this pathway to alleviate
these symptoms .
Question 10: A patient exhibits a pattern of instability in interpersonal
relationships, self-image, and affects, along with marked impulsivity. This is
most consistent with which personality disorder?
