Chapter review

Fitzgerald PMHNP board review. ch10. Schizophrenia. This is drive 6 of 6. When I say Pause. Answer. wait, then I will give the answer. New section. Medical rule-outs, etiology, and board pearls. Topic. High-yield board traps. FITZGERALD CH10 — Schizophrenia > Medical rule-outs, etiology, and board pearls > High-yield board traps. Bottom Line Summary. * Diagnostic timeline criteria require continuous signs of disturbance for at least 6 months, including at least 1 month of active symptoms with two or more characteristic findings: **delusions**, **hallucinations**, **disorganized speech**, **grossly disorganized or catatonic behavior**, or **negative symptoms**. * At least one active symptom must be **delusions**, **hallucinations**, or **disorganized speech**. * **Board trap**: Illusions misinterpret actual external stimuli, whereas **hallucinations** occur with no external stimulus. Hypnagogic and hypnopompic hallucinations are normal sleep-wake transitions, not psychotic symptoms. * **Safety alert**: Visual hallucinations in an alert, elderly patient with vision loss (macular degeneration) and intact cognition represent **Charles Bonnet syndrome**, not late-onset **schizophrenia**. * Genetic concordance is highest in monozygotic twins at 50%. It drops to 40% if both parents have **schizophrenia**, 12% for one parent, and 8% for non-twin siblings. * Tobacco addiction affects 90% of individuals with **schizophrenia**. Hydrocarbon smoke byproducts induce **CYP1A2**, lowering blood levels of **clozapine** and **olanzapine**. * **Neuroleptic Malignant Syndrome (NMS)** presents with severe muscle rigidity, hyperthermia, autonomic instability, and altered consciousness. Serum **creatine kinase (CK)** spikes between 1,000 and 100,000 IU/L. * **Clozapine** requires a baseline **Absolute Neutrophil Count (ANC)** of at least 1,500/mm3. Stop **clozapine** immediately if **ANC** falls below 1,000/mm3. High-Yield Concept Map and Teaching Points. Perceptual Distortions vs. Primary Psychosis. * **Board trap**: Do not confuse illusions with **hallucinations**. An illusion is a real sensory perception that is misinterpreted, such as mistaking a coat rack for an intruder in a dim room. A **hallucination** is a vivid, involuntary sensory perception occurring without any external stimulus. Auditory hallucinations are the most common presentation in **schizophrenia**. * **Board trap**: Hypnagogic hallucinations occur while falling asleep. Hypnopompic hallucinations occur while waking up. Both are normal physiological transitions and must never be diagnosed as **schizophrenia**. Medical Rule-Outs and Physical Mimics. * **Safety alert**: Always complete a thorough medical evaluation for atypical presentations, new-onset symptoms after age 40, or sudden decompensation. * **Charles Bonnet syndrome**: Occurs in elderly individuals with age-related macular degeneration, glaucoma, or diabetic retinopathy. Patients experience complex visual hallucinations while remaining alert, lucid, and cognitively intact with zero auditory hallucinations. * Central nervous system mimics include **Huntington disease**, **multiple sclerosis**, **Parkinson disease**, temporal lobe epilepsy, head trauma, and CNS neoplasms. * Infectious and metabolic mimics include neurosyphilis, HIV encephalopathy, herpes encephalitis, **Creutzfeldt-Jakob disease**, hyponatremia, hypercalcemia, B12 deficiency, thiamine deficiency, **Addison disease**, and **Cushing syndrome**. * Pharmacological mimics include **corticosteroids**, **anabolic steroids**, **cimetidine**, **disulfiram**, and sympathomimetic stimulants. Etiology and Neurobiology. * Etiology is unknown but represents a brain-based biological illness with multifactorial origin. * Winter and spring birth dates correlate with higher incidence due to perinatal viral exposure, maternal starvation, or hypoxia. * Neurotransmitter dysregulation involves dopamine, glutamate, GABA, acetylcholine, nicotine, serotonin, and norepinephrine. * **First-line**: **Second-generation antipsychotics (SGAs)** combine D2 receptor antagonism with 5-HT2A serotonin antagonism, delivering superior efficacy for **negative symptoms** compared to **first-generation antipsychotics (FGAs)**. Violence, Suicide, and Homicide Facts. * **Board trap**: Medicated patients with **schizophrenia** are no more likely to commit homicide than the general public. * Violence in **schizophrenia** is a complication of non-treatment, acute agitation, or command hallucinations. Patients are far more likely to be victims of violence than perpetrators. * Suicide is attempted by 20% to 50% of patients, with a 5% long-term completion rate. Risk peaks during co-occurring **major depressive disorder** episodes, command hallucinations, substance misuse, or high insight into disease limitations. Pharmacokinetics and Clozapine Safety. * **Board trap**: Tobacco smoke byproducts induce the **CYP1A2** isoenzyme. This accelerates the clearance of **clozapine** and **olanzapine**. Smoking cessation or inpatient non-smoking status causes serum drug levels to surge, increasing toxicity risk. * **Safety alert**: **Clozapine** carries a risk of life-threatening agranulocytosis in 1% to 2% of patients. Initiate therapy only if **ANC** is 1,500/mm3 or greater. Monitor **ANC** weekly for 6 months, biweekly for 6 months, then monthly. Interrupt treatment if **ANC** drops below 1,000/mm3. * **Clozapine** also carries a severe risk for anticholinergic constipation leading to small bowel obstruction, requiring a prophylactic bowel regimen. Board-Style Practice Question Bank. Question 1. Which of the following statements is false regarding schizophrenia? A. A violent episode can be in response to a hallucination. B. The presence of an MDD episode can increase the risk of a suicide attempt. C. Suicide is attempted in up to 50% of patients with schizophrenia. D. Patients with schizophrenia are more likely to commit a homicide than a member of the general public. Pause. Answer. D. Why correct: Statement D is false. When treated and medicated, patients with **schizophrenia** are no more likely to commit homicide than members of the general public. Why each distractor fails: * A is a true statement because non-treated patients may act aggressively when responding to frightening command hallucinations. * B is a true statement because a co-occurring **major depressive disorder** episode is a major risk factor for suicide. * C is a true statement because 20% to 50% of patients with **schizophrenia** attempt suicide over their lifetime. Question 2. According to DSM-5-TR criteria, which of the following are characteristic symptoms of schizophrenia? (Select all that apply) A. Delusions B. Hallucinations C. Compulsive behaviors D. Disorganized speech Pause. Answer. A, B, and D. Why correct: **Delusions**, **hallucinations**, and **disorganized speech** are core Criterion A symptoms for **schizophrenia**. **Compulsive behaviors** are characteristic of obsessive-compulsive spectrum disorders, not core criteria for **schizophrenia**. Why each distractor fails: * A is incorrect to exclude because **delusions** are a primary Criterion A feature. * B is incorrect to exclude because **hallucinations** are a primary Criterion A feature. * D is incorrect to exclude because **disorganized speech** is a primary Criterion A feature. Question 3. Laura is a 34-year-old woman diagnosed with schizophrenia 18 months ago who presents for follow-up. She mentions feeling out of it most of the day since her medication change 5 weeks ago and has gained 10 pounds (4.54 kg). This patient is most likely taking: A. Quetiapine B. Aripiprazole C. Risperidone D. Ziprasidone Pause. Answer. A. Why correct: **Quetiapine** causes significant H1-histamine and alpha-1 adrenergic blockade, leading to prominent daytime sedation ("feeling out of it") and metabolic weight gain. Why each distractor fails: * B is wrong because **aripiprazole** is a partial D2 agonist with minimal sedation and low weight-gain risk. * C is wrong because although **risperidone** causes weight gain and prolactin elevation, **quetiapine** produces far greater daytime sedation. * D is wrong because **ziprasidone** is weight-neutral and must be taken with a 500-calorie meal. Question 4. Indicate whether each of the following is a positive (P) or negative (N) schizophrenia symptom: Hallucinations, Poverty of speech, Avoidance of eye contact, Disorganized behavior. A. Hallucinations (P), Poverty of speech (N), Avoidance of eye contact (N), Disorganized behavior (P) B. Hallucinations (N), Poverty of speech (P), Avoidance of eye contact (P), Disorganized behavior (N) C. All four are positive symptoms D. All four are negative symptoms Pause. Answer. A. Why correct: Positive symptoms are additions to normal behavior (**hallucinations**, **disorganized behavior**). Negative symptoms represent deficits in normal functioning (**poverty of speech**, **avoidance of eye contact**). Why each distractor fails: * B is wrong because it reverses active additions and passive deficit symptoms. * C is wrong because **poverty of speech** and eye-contact avoidance are deficit features. * D is wrong because **hallucinations** and disorganized behavior are active additions. Question 5. Mrs. Engle is a 75-year-old woman with a 40-year history of type 2 diabetes mellitus referred for consultation due to new-onset visual hallucinations. She describes seeing pictures of familiar scenes and people, does not hear voices, is aware they are not real, and is alert and lucid. She has no cognitive impairment or psychiatric history. Her vision has deteriorated due to macular degeneration. What is the most likely explanation? A. Disorganized schizophrenia B. Early sign of Alzheimer's disease C. Charles Bonnet syndrome D. Temporal lobe epilepsy Pause. Answer. C. Why correct: **Charles Bonnet syndrome** causes visual hallucinations in elderly patients with visual impairment who retain intact cognition, alertness, and full insight into the unreality of their perceptions. Why each distractor fails: * A is wrong because late-onset **schizophrenia** is rare, and she lacks disorganized speech or negative symptoms. * B is wrong because she is fully alert, lucid, and has no memory impairment. * D is wrong because temporal lobe epilepsy causes brief complex partial seizures with olfactory or gustatory aura rather than clear visual scenes with full insight. Question 6. A 22-year-old male diagnosed with paranoid schizophrenia has been taking haloperidol for the past 6 months. During this visit, the PMHNP notes involuntary, repetitive muscle movements and excessive eye blinking not documented previously. What is the appropriate next course of action? A. Measure serum ALT and AST B. Measure serum creatinine C. Administer PHQ-9 questionnaire and compare to baseline D. Administer AIMS questionnaire and compare to baseline value Pause. Answer. D. Why correct: Involuntary repetitive facial movements and eye blinking indicate **tardive dyskinesia**, which requires objective evaluation using the **Abnormal Involuntary Movement Scale (AIMS)**. Why each distractor fails: * A is wrong because liver enzymes do not assess extrapyramidal movement disorders. * B is wrong because serum creatinine evaluates renal clearance, not movement symptoms. * C is wrong because the PHQ-9 assesses depression severity. Question 7. A 22-year-old patient is newly diagnosed with schizophrenia and presents for an outpatient appointment with his parents. Which task does the PMHNP recognize as the most critical to complete at this visit? A. Notify the patient's school or work of the diagnosis B. Educate the patient on the importance of medication adherence C. Reassure family members of a low risk of suicide attempt D. Educate family members of possible increased risk for homicidal tendencies Pause. Answer. B. Why correct: **First-line** clinical priority at initial diagnosis is educating the patient on **medication adherence** to prevent relapse, rehospitalization, and ongoing neurobiological impairment. Why each distractor fails: * A is wrong because disclosing medical records without explicit consent violates HIPAA. * C is wrong because suicide risk is high (20% to 50% lifetime attempts), so false reassurance is unsafe. * D is wrong because medicated patients with **schizophrenia** have no increased risk of homicide compared to the general public. Question 8. The PMHNP anticipates that treatments commonly employed to reduce the morbidity of schizophrenia include all of the following except: A. Psychodynamic psychotherapy B. Cognitive behavioral therapy C. Assertive community treatment D. Social skills training Pause. Answer. A. Why correct: **Psychodynamic psychotherapy** is not an evidence-based treatment for **schizophrenia** and can worsen anxiety or regression in psychotic states. Why each distractor fails: * B is wrong to select as the exception because **cognitive behavioral therapy (CBT) for psychosis** is an established evidence-based modality. * C is wrong to select as the exception because **Assertive Community Treatment (ACT)** teams reduce hospital admissions. * D is wrong to select as the exception because **Social Skills Training (SST)** improves daily community functioning. Question 9. A 34-year-old male is brought to the emergency department with muscle rigidity, hyperthermia, and altered mental status. He has been receiving fluphenazine for 3 weeks and initiated lithium therapy recently. An expected laboratory finding for this patient is: A. Hemoglobin A1c greater than 8.5% B. Platelets equal to 650,000 C. Serum creatine kinase greater than 1,000 IU/L D. ALT to AST ratio greater than 5 to 1 Pause. Answer. C. Why correct: The triad of hyperthermia, severe muscle rigidity ("hot, stiff, and out of it"), and altered consciousness defines **Neuroleptic Malignant Syndrome (NMS)**, which causes massive muscle breakdown spiking serum **creatine kinase (CK)** between 1,000 and 100,000 IU/L. Why each distractor fails: * A is wrong because HbA1c measures long-term glucose control, not acute rhabdomyolysis. * B is wrong because elevated platelets do not indicate or quantify **NMS**. * D is wrong because hepatic transaminase ratios do not diagnose **NMS**. 💡 Want to test your recall on clozapine ANC cutoffs or compare first-generation versus second-generation extrapyramidal side-effect profiles next? Next. Topic. Fitzgerald Sample Question 7. Bottom Line Summary. * **Prevalence and Onset**: **Schizophrenia** affects **0.7%** of the general population equally between genders (1:1 ratio). Peak onset in males is **10 to 25 years**, whereas peak onset in females is **25 to 35 years** with a secondary peak after age **40 years**. * **Genetics and Etiology**: Monozygotic twin concordance is **50%**, proving that non-genetic factors play an equal role. Risk is **40%** if both parents have **schizophrenia**, **12%** if one parent is affected, and **8%** for non-twin siblings. * **Comorbidities and Life Expectancy**: Lifetime prevalence of tobacco dependence is **90%**, non-tobacco substance use disorder is **50%**, and alcohol use disorder is **40%**. **Schizophrenia** reduces life expectancy by **20%** (up to **20 to 25 years**) primarily due to premature cardiovascular disease, metabolic complications, and smoking. * **Pharmacokinetics of Smoking**: Hydrocarbon byproducts in tobacco smoke induce the **CYP1A2** enzyme, lowering serum concentrations of **clozapine** and **olanzapine**. Patients who stop smoking abruptly while hospitalized experience elevated drug levels and severe toxicity risks. * **Perceptual Definitions**: An **illusion** is the misinterpretation of an actual external physical stimulus (e.g., mistaking shadows on a ceiling for spiders). A **hallucination** is a sensory perception without any external stimulus. A **delusion** is a fixed false belief regarding thought content. * **Diagnostic Criteria**: Requires at least 2 characteristic symptoms for a 1-month active phase (at least 1 must be **delusions**, **hallucinations**, or **disorganized speech**), with continuous signs of disturbance persisting for at least **6 months**. * **Suicide Risk**: **20% to 50%** of patients with **schizophrenia** attempt suicide, and **5%** die by suicide. Risk peaks during co-occurring **major depressive disorder** episodes, periods following hospital discharge, and when patients gain insight into their functional impairment. High-Yield Concept Map: Etiology, Medical Rule-Outs, and Perceptual Disturbances. Schizophrenia Etiology and Risk Hierarchy. * **Biopsychosocial Model**: **Schizophrenia** is a neurodevelopmental brain disorder caused by polygenic vulnerability interacting with environmental stressors. * **Perinatal Risk Factors**: Birth during **winter and spring** correlates with higher risk due to seasonal influenza exposure, maternal malnutrition, fetal hypoxia, and advanced paternal age. * **Neurotransmitter Dysregulation**: Involves mesolimbic dopamine hyperactivity (causing positive symptoms), mesocortical dopamine hypoactivity (causing negative and cognitive symptoms), **serotonin** 5-HT2A dysregulation, glutamate NMDA receptor hypofunction, and GABA deficits. Medical Rule-Outs and Differential Diagnosis. * **Neurologic Mimics**: **Huntington's disease**, **Parkinson's disease**, **Alzheimer's disease**, **Lewy body dementia**, temporal lobe epilepsy, CNS neoplasms, and traumatic brain injury. * **Infectious and Vascular Causes**: **Neurosyphilis**, **HIV** encephalopathy, **herpes encephalitis**, **Creutzfeldt-Jakob disease**, and hypertensive encephalopathy. * **Endocrine and Metabolic Derangements**: **Uremia**, **hyponatremia**, **hypoglycemia**, **Addison's disease**, **Cushing's syndrome**, and **thyroid** storm or severe hypothyroidism. * **Nutritional and Substance Mimics**: **Vitamin B12** deficiency, **thiamine** deficiency (Wernicke-Korsakoff), **folate** deficiency, **corticosteroids**, **anabolic steroids**, **cimetidine**, **disulfiram**, and heavy metal toxicity (lead, mercury, arsenic). Perceptual Disturbance Classification. * **Illusion**: Misperception of a real sensory input. An external object exists, but the brain misinterprets its identity. * **Hallucination**: Perception of a sensory phenomenon when no external stimulus exists. Can be auditory (most common), visual, tactile, olfactory, or gustatory. * **Delusion**: False, fixed belief that cannot be corrected by logical reasoning or evidence to the contrary. * **Derealization**: Subjective feeling that the surrounding environment is unreal, distant, or artificial, without misidentifying specific physical objects. Signposts: Safety Alerts, Board Traps, and First-Line Standards. * **Safety alert**: Abrupt smoking cessation in a patient taking **clozapine** or **olanzapine** removes **CYP1A2** induction, causing blood levels to spike rapidly into toxic ranges. Monitor serum concentrations closely and reduce doses when patients enter smoke-free facilities. * **Safety alert**: Suicide risk is exceptionally high in **schizophrenia** when patients experience co-occurring **major depressive disorder**, active command hallucinations, or restored insight into the chronic limitations of their illness. * **Board trap**: Do not confuse an **illusion** with a **hallucination** on exam stems. Check whether a real physical object is present in the patient's environment. If the stem mentions an object (like ceiling shadows, a coat rack, or a rustling curtain), the misperception is an **illusion**. * **Board trap**: Exam writers test genetics by asking about twin concordance. Monozygotic twin concordance is **50%**, which means there is also a **50%** chance the twin will not develop **schizophrenia**. * **First-line**: **SGAs** (second-generation antipsychotics) are first-line treatment for **schizophrenia** because of lower **EPS** and **tardive dyskinesia** risks and superior action against negative symptoms via **serotonin** 5-HT2A receptor antagonism. * **First-line**: **Clozapine** is the gold-standard third-line agent for treatment-resistant **schizophrenia** (failing 2 adequate trials of antipsychotics) and for reducing persistent suicidal or homicidal behavior. Fitzgerald Sample Question Analysis. Question 7. A 22-year-old male patient diagnosed with **schizophrenia** points to dark shadow patterns on the ceiling tiles in his exam room and states, "Look at all those large black spiders crawling right above my bed!" The PMHNP recognizes this sensory misinterpretation of an actual external stimulus as which of the following? * A. **Illusion** * B. **Hallucination** * C. **Delusion** * D. **Derealization** Pause. Answer. **Quick Answer**: The patient is experiencing an **illusion** (Choice A). **Key Clue**: The stem notes that the patient is looking at "dark shadow patterns on the ceiling tiles" and misinterpreting them as crawling spiders. **Best Answer**: A. **Illusion** **Why It Is Correct**: An **illusion** is defined as the misperception or misinterpretation of an actual external physical stimulus. In this scenario, the real physical stimulus consists of dark shadow patterns on the ceiling tiles, which the patient's brain erroneously interprets as crawling spiders. **Why the Other Choices Are Wrong**: * **A**: Correct answer. * **B**: A **hallucination** is a false sensory perception occurring without any external physical stimulus. If the ceiling tiles were plain white with no shadows or marks and the patient saw spiders, that would be a visual hallucination. * **C**: A **delusion** is a fixed false belief regarding thought content that persists despite clear evidence to the contrary (e.g., believing the hospital ceiling is equipped with government spy cameras). It involves thought content rather than a sensory misinterpretation of an existing physical object. * **D**: **Derealization** is a subjective feeling that one's surroundings are unreal, dreamlike, or distorted. It does not involve misinterpreting a specific physical object as a completely different entity. **Test-Taking Pearl**: On board exams, always scan the stem for the presence of an environmental object. If an external stimulus exists in the room (curtains, shadows, white noise), the answer is an **illusion**. If no external stimulus exists, the answer is a **hallucination**. Active Recall Checkpoints. 1. What is the definition of an **illusion**, and how does it differ from a **hallucination**? 2. What isoenzyme is induced by tobacco smoke byproducts, and which two atypical antipsychotics are affected? 3. What is the monozygotic twin concordance rate for **schizophrenia**, and what does this number indicate about etiology? 4. What age range represents peak onset for **schizophrenia** in males versus females? 5. Which antipsychotic is specifically indicated for reducing persistent suicidal behavior in **schizophrenia**? Next Study Step. Proceed to **Fitzgerald Chapter 11: Substance-Related Disorders** to master the **CYP450** enzyme interactions, intoxication and withdrawal toxidromes, and pharmacological management of addiction. Next. End of this drive.