Chapter review

Fitzgerald PMHNP board review. ch14. Older Adults. This is drive 1 of 7. When I say Pause. Answer. wait, then I will give the answer. New section. Introductory Geriatric Concepts and Screening Myths. Topic. The Three Ds: Clinical Triad. Bottom Line. * **The Three Ds** of geriatric psychiatry represent the clinical triad of **depression**, **dementia** (major neurocognitive disorder), and **delirium** [1, 2]. * Standardized depression screening instruments, such as the **PHQ-9**, are fully valid and effective for adults over 65 years of age across community, acute, and nursing home settings [3, 4]. * Advancing age is not an independent risk factor for developing **major depressive disorder**, despite the accumulation of physical and psychosocial losses in late life [4, 5]. * Older adults who commit suicide frequently communicate their intent beforehand through direct verbal statements, indirect comments, or behavioral cues like giving away personal possessions [1, 5]. * Up to 50 percent of patients diagnosed with **major neurocognitive disorder** suffer from co-occurring **major depression**, requiring routine screening and targeted treatment source 1. * **Delirium** is an acute disturbance in attention and awareness that develops over hours to days, fluctuates in severity throughout the day, and is caused by an underlying medical condition, substance toxicity, or withdrawal [6, 7]. * Multiple episodes of **delirium** accelerate the cognitive decline and progression of underlying **major neurocognitive disorder** [8, 9]. * **Selective serotonin reuptake inhibitors (SSRIs)** are preferred agents for late-life depression, but clinicians must monitor for **hyponatremia**, especially when combined with diuretics [10-12]. Core Clinical Teaching: The Three Ds Triad. Screening Myths and Geriatric Truths. Clinical evaluation of the older adult requires dispelling common misconceptions regarding mood, aging, and cognitive decline [3, 4]. **Board trap.** Exam questions frequently present an elderly patient with mood changes and tempt test-takers to view depression as an inevitable, normal part of aging [4, 5]. Advancing age alone is not an independent risk factor for **major depressive disorder** [4, 5]. When an older adult presents with depressive symptoms, conduct a formal evaluation rather than dismissing the presentation as normal aging [3, 4]. Standardized screening tools like the **PHQ-9** maintain high diagnostic validity in individuals over 65 years of age [3, 4]. These tools are routinely utilized in outpatient clinics, acute hospital units, and long-term care facilities to establish diagnostic baselines source 4. **Safety alert.** Older adults represent a high-risk demographic for completed suicide, particularly elderly white males [1, 5]. Contrary to common belief, suicidal elders usually communicate their plans prior to an attempt [1, 5]. Verbal statements, indirect comments regarding being a burden, or giving away personal belongings must be treated as active warning signs requiring immediate safety stabilization and environmental risk reduction [1, 5]. Differentiating the Three Ds. The primary diagnostic responsibility in geriatric psychiatry is distinguishing among **depression**, **dementia**, and **delirium** [1, 2]. **Delirium** presents as an acute onset of impaired attention, reduced environmental awareness, and global cognitive disturbance [6, 7]. Symptoms emerge rapidly over hours to days and characteristically fluctuate throughout the day, often worsening in the evening hours [6, 7, 13]. **Delirium** is secondary to a direct physiological etiology, such as urinary tract infections, electrolyte imbalances like **hyponatremia**, or anticholinergic medication toxicity [7, 10, 14, 15]. **Dementia** (major neurocognitive disorder) represents an insidious, progressive decline in cognitive function from a previously established baseline across one or more cognitive domains [16-18]. Unlike **delirium**, attention and level of consciousness remain intact in early and moderate stages, and symptoms do not fluctuate hour to hour [6, 19]. However, repeated episodes of **delirium** significantly accelerate the underlying progression of **major neurocognitive disorder** [8, 9]. **Depression** in older adults frequently presents with somatic complaints, fatigue, cognitive slowing, and executive dysfunction [4, 14]. Up to 50 percent of patients with **major neurocognitive disorder** experience co-occurring **major depression** source 1. Distinguishing depressive pseudodementia from primary neurocognitive decline requires assessing onset timeline, self-reported memory complaints, and effort during cognitive testing [1, 20]. Patients with primary depression typically highlight their cognitive failures and demonstrate variable performance, whereas patients with primary dementia attempt to cover up deficits source 20. **First-line.** First-line pharmacotherapy for late-life depression consists of **SSRIs** started at low doses and titrated slowly to therapeutic effect [2, 12, 21]. Clinicians must obtain baseline renal and hepatic labs and monitor serum sodium levels due to the risk of **hyponatremia** [10, 22]. For severe, psychotic, or treatment-resistant depression in elders over age 65, **electroconvulsive therapy (ECT)** remains a safe and highly effective treatment modality [22-25]. Sample Practice Questions. Question 1. Most standardized screening instruments for depression are not valid in people over 65 years of age. * A. True * B. False * C. Valid only in inpatient hospital settings * D. Valid only when administered by a neurologist **Pause.** **Answer:** B. **Why correct:** Standardized depression screening instruments, including the **PHQ-9**, are fully validated and routinely utilized for individuals over 65 years of age across community, outpatient, and long-term care settings [3, 4]. **Why the other choices are wrong:** * **A:** Incorrect because advanced age does not invalidate standard depression screening tools [3, 4]. * **C:** Incorrect because instruments like the **PHQ-9** are valid across outpatient, home, and residential care environments, not just inpatient units source 4. * **D:** Incorrect because nurse practitioners and primary care clinicians routinely administer and interpret these tools independently source 4. Question 2. Advanced age is an independent risk factor for developing major depression. * A. True * B. False * C. True only in male patients * D. True only in hospitalized patients **Pause.** **Answer:** B. **Why correct:** Advancing age itself is not an independent risk factor for developing **major depressive disorder**, although aging is frequently accompanied by an accumulation of physical, social, and functional losses [4, 5]. **Why the other choices are wrong:** * **A:** Incorrect because aging alone does not independently cause or predict major depression [4, 5]. * **C:** Incorrect because gender does not make age an independent risk factor [4, 5]. * **D:** Incorrect because while medical inpatients experience higher depression rates, advancing age itself remains a non-independent variable [2, 4]. Question 3. Most elderly persons who commit suicide do not talk about their plans. * A. True * B. False * C. True only among women * D. True only among patients with dementia **Pause.** **Answer:** B. **Why correct:** Older adults who commit suicide frequently communicate their intent prior to an attempt through direct verbal expressions, indirect statements, or explicit behaviors like giving away personal possessions [1, 5]. **Why the other choices are wrong:** * **A:** Incorrect because suicidal elders usually give explicit or implicit warnings before acting [1, 5]. * **C:** Incorrect because both elderly men and women communicate suicidal ideation prior to attempts [1, 5]. * **D:** Incorrect because verbal and behavioral warning signs occur across various cognitive baselines [1, 5]. Question 4. Up to what percentage of individuals with major neurocognitive disorder also suffer from co-occurring major depression? * A. 10 percent * B. 25 percent * C. 50 percent * D. 75 percent **Pause.** **Answer:** C. **Why correct:** Up to 50 percent of patients diagnosed with **major neurocognitive disorder** also experience co-occurring **major depression**, making routine mood screening essential in dementia care source 1. **Why the other choices are wrong:** * **A:** 10 percent significantly underestimates the true clinical co-occurrence rate source 1. * **B:** 25 percent underestimates the actual prevalence documented in clinical review sources source 1. * **D:** 75 percent overstates the documented rate of co-occurring depression in this population source 1. Next. Topic. Initial Diagnostic Workup Protocols. Bottom Line Summary. * **Major neurocognitive disorder** (**NCD**) initial diagnostic workup requires a complete history (**ADLs** and **IADLs**), physical exam with focal neurological testing, cognitive assessment (**MoCA**, **SLUMS**, **MMSE**), and baseline laboratory screening including **CBC**, **TSH**, **vitamin B12** (with **MMA** or **homocysteine** if low-normal), **folate**, **CMP** (**glucose**, electrolytes, renal and liver function, **albumin**, protein), **RPR** or **VDRL**, **HIV**, and **urinalysis** (**UA**). * **First-line** laboratory priority in acute mental status change (**delirium**) focuses on immediate reversible metabolic and infectious triggers: serum **glucose**, **urinalysis**, **CMP**, **CBC**, and **EKG**. Routine **HIV** testing and immediate **head CT** scan are less essential in acute delirium unless focal neurological deficits or trauma are present. * Standardized depression screening tools like the **PHQ-9** and **GDS** are valid in adults over **65** years of age. Advancing age alone is not an independent risk factor for **major depressive disorder**, though up to **50%** of patients with **major NCD** have co-occurring depression. * **ApoE e4 allele** genetic testing is not recommended for routine clinical use, but genetic testing is indicated for suspected early-onset **Alzheimer's disease** occurring before age **65** (accounting for less than **5%** of cases). * Neuroimaging with **head CT** or **MRI** is indicated in the initial diagnostic evaluation of **major NCD** to rule out structural causes such as **subdural hematoma**, **normal pressure hydrocephalus**, or cerebrovascular disease. * Pharmacotherapy in older adults requires baseline renal and hepatic labs before starting psychotropics. **SSRIs** like **sertraline** carry a risk of **hyponatremia** (especially with diuretics like **hydrochlorothiazide**), while **tricyclic antidepressants** like **amitriptyline** and sedatives like **zolpidem** should be avoided due to fall risk, orthostasis, and severe **anticholinergic** toxicity. * **Antipsychotics** carry an FDA **Black Box Warning** for increased mortality (1.6 to 1.7 times higher risk, primarily cardiovascular or pneumonia) in elderly patients with **NCD-related psychosis**, and must be reserved strictly for severe agitation or immediate safety risks. * **Electroconvulsive therapy** (**ECT**) is safe and effective for adults over **65** years of age with severe, psychotic, or treatment-resistant depression. High-Yield Concept Map: Initial Diagnostic Workup Protocols. Core Clinical Objectives. * Differentiate the three Ds: **depression**, **dementia** (**major neurocognitive disorder**), and **delirium**. * Identify reversible or correctable medical contributors to cognitive decline (found in 2% to 5% of cases, such as **normal pressure hydrocephalus**, **subdural hematoma**, or **hypothyroidism**). * Establish an objective cognitive baseline using validated tools (**MoCA**, **SLUMS**, **MMSE**, **Mini-Cog**). * Assess functional capacity across **ADLs** (bathing, dressing, toileting, grooming) and **IADLs** (preparing meals, managing finances, doing laundry, house cleaning). * Evaluate for co-occurring mood disorders, as **depression** co-occurs in up to **50%** of individuals with **major NCD**. Baseline Laboratory Workup for Major Neurocognitive Disorder. 1. **CBC** (Complete Blood Count) to evaluate for anemia, infection, or hematologic pathology. 2. **TSH** (Thyroid Stimulating Hormone) to rule out **hypothyroidism** or **hyperthyroidism**. 3. **Vitamin B12** and **folate** levels. If **vitamin B12** is in the low-normal range, order **methylmalonic acid** (**MMA**) or **homocysteine** levels to confirm cellular deficiency. 4. **CMP** (Comprehensive Metabolic Panel) to assess serum **glucose**, electrolytes (**sodium**, potassium), renal function (**BUN**, **creatinine**), liver function tests, serum **albumin**, and total **protein**. 5. **Urinalysis** (**UA**) to detect occult urinary tract infection. 6. Infectious disease screening including **RPR** or **VDRL** for neurosyphilis and **HIV** testing. Differentiating Acute Delirium Workup vs Chronic NCD Evaluation. * **Safety alert**: Acute mental status changes occurring over hours to days signal **delirium**, which is a medical emergency. * **First-line** initial labs for acute **delirium** focus on immediate physical rule-outs: serum **glucose**, **urinalysis**, **CMP**, **CBC**, and **EKG**. * **Board trap**: Selecting a **head CT** scan or **HIV** test as the initial priority for acute delirium without focal neurological deficits or trauma. Metabolic, infectious, and cardiac causes must be evaluated first. * Structural neuroimaging (**head CT** or **MRI**) is essential during the comprehensive workup of **major NCD** to identify **subdural hematoma**, **vascular NCD** infarcts, or **normal pressure hydrocephalus**. Specialized Diagnostic Testing Rules. * Genetic testing for the **ApoE e4 allele** is not recommended for routine clinical diagnosis of **Alzheimer's disease**. * Genetic testing is indicated for early-onset **Alzheimer's disease** presenting before age **65**, which represents less than **5%** of cases. * Neuropsychological testing is indicated for diagnostic clarity, establishing objective baselines, assessing functional competency, and designing rehabilitation strategies. Prescribing Safety and Medication Rule-Outs. * **First-line** pharmacotherapy for co-occurring **depression** or **anxiety** in older adults is an **SSRI** such as **sertraline**. * **Safety alert**: **SSRIs** increase the risk of **hyponatremia** (SIADH), especially when combined with diuretics like **hydrochlorothiazide** or **lisinopril**. Check serum **sodium** if confusion or falls occur. * **Board trap**: Avoid **tricyclic antidepressants** like **amitriptyline** due to severe **anticholinergic** side effects (dry mouth, constipation, blurry vision, urinary retention) and anticholinergic delirium. * **Board trap**: Avoid **zolpidem** due to increased fall and fracture risks. * **Safety alert**: **Antipsychotics** carry a **Black Box Warning** for elderly patients with **NCD-related psychosis** due to a 1.6 to 1.7 times increased risk of mortality. Use **second-generation antipsychotics** (**SGAs**) at low doses only for severe agitation or unmanageable safety hazards, never for routine wandering or minor verbal outbursts. Board-Style Practice Question Bank. Question 1. Question: Most standardized screening instruments for depression are not valid in people over 65 years of age. * A. True * B. False **Quick Answer**: Standardized depression screening instruments are valid and recommended for older adults. **Key Clue**: Standardized screening validity in older adults. **Best Answer**: B. False. **Why It Is Correct**: Standardized tools like the **PHQ-9** and **GDS** are validated and routinely used in adults over **65** years of age across community and long-term care settings. **Why the Other Choices Are Wrong**: * A. True is incorrect because validated instruments accurately screen for depression in geriatric populations. * B. This is the correct choice. **Test-Taking Pearl**: Do not assume age invalidates standardized psychiatric screening tools. Question 2. Question: Advanced age is an independent risk factor for developing major depression. * A. True * B. False **Quick Answer**: Advancing age alone does not cause major depression. **Key Clue**: Independent risk factor. **Best Answer**: B. False. **Why It Is Correct**: While aging is accompanied by physical and psychosocial losses, advanced age itself is not an independent risk factor for **major depressive disorder**. **Why the Other Choices Are Wrong**: * A. True is incorrect because aging alone is not a direct causal risk factor for depression. * B. This is the correct choice. **Test-Taking Pearl**: Differentiate age-related psychosocial losses from advancing age as an independent diagnostic variable. Question 3. Question: Most elderly persons who commit suicide do not talk about their plans. * A. True * B. False **Quick Answer**: Elderly individuals frequently communicate suicidal intent before making an attempt. **Key Clue**: Do not talk about their plans. **Best Answer**: B. False. **Why It Is Correct**: Older adults frequently express suicidal intent through direct statements, indirect comments, or behavioral changes like giving away possessions. **Why the Other Choices Are Wrong**: * A. True is incorrect because elderly patients often give explicit or subtle warnings regarding suicide. * B. This is the correct choice. **Test-Taking Pearl**: Always take subtle suicidal comments or behavioral changes in older adults as serious warning signs. Question 4. Question: Up to 50 percent of individuals with major neurocognitive disorders also suffer from co-occurring depression. * A. True * B. False **Quick Answer**: Co-occurring depression affects up to half of patients with major neurocognitive disorders. **Key Clue**: Major neurocognitive disorder co-occurring depression rate. **Best Answer**: A. True. **Why It Is Correct**: **Depression** co-occurs in up to **50%** of patients with **major neurocognitive disorder**, highlighting the overlap among the three Ds. **Why the Other Choices Are Wrong**: * A. This is the correct choice. * B. False is incorrect because depressive symptoms are extremely common in dementia. **Test-Taking Pearl**: Always screen for depression when evaluating cognitive decline in older adults. Question 5. Question: A 74-year-old male presents with acute erratic behavior and fluctuating confusion lasting a few hours at a time over the past month after starting a new medication. Which of the following medications is least likely to cause these delirium episodes? * A. Diphenhydramine * B. Sertraline * C. Haloperidol * D. Diazepam **Quick Answer**: Sertraline is an SSRI and is least likely to precipitate acute delirium compared to anticholinergic or sedative agents. **Key Clue**: Least likely to cause delirium. **Best Answer**: B. Sertraline. **Why It Is Correct**: **Sertraline** is a preferred **SSRI** for older adults and is least likely to induce delirium. **Diphenhydramine**, **haloperidol**, and **diazepam** possess strong anticholinergic, extrapyramidal, or sedative properties that readily cause delirium. **Why the Other Choices Are Wrong**: * A. Diphenhydramine causes severe anticholinergic confusion and delirium. * B. This is the correct choice. * C. Haloperidol can trigger extrapyramidal symptoms or paradoxical agitation. * D. Diazepam causes sedation, ataxia, memory impairment, and delirium in the elderly. **Test-Taking Pearl**: Avoid anticholinergics and sedatives in older adults to prevent acute delirium. Question 6. Question: Which of the following is least essential to the initial diagnostic workup for a patient presenting with an acute mental status change? * A. Head CT scan * B. Complete blood count * C. Comprehensive metabolic panel * D. Electrocardiogram **Quick Answer**: A head CT scan is less essential initially than immediate laboratory and cardiac rule-outs for acute delirium. **Key Clue**: Acute mental status change initial workup. **Best Answer**: A. Head CT scan. **Why It Is Correct**: An acute change in mental status indicates **delirium**, which requires immediate laboratory and cardiac evaluation (**CBC**, **CMP**, **EKG**, **glucose**, **UA**). Neuroimaging is secondary unless focal neurological deficits or trauma are identified. **Why the Other Choices Are Wrong**: * A. This is the correct choice. * B. CBC is essential to evaluate for infection or severe anemia. * C. CMP is essential to detect hypoglycemia, electrolyte imbalances, or organ dysfunction. * D. EKG is essential to rule out cardiac ischemia or dysrhythmias. **Test-Taking Pearl**: Assess metabolic, infectious, and cardiac causes before ordering structural neuroimaging in acute delirium. Question 7. Question: When assessing a 73-year-old woman with a sudden onset of mental status change, all of the following initial diagnostic tests are essential except: * A. Serum glucose level * B. Urinalysis * C. Liver function tests * D. HIV test **Quick Answer**: An HIV test is not a first-line initial laboratory test for acute delirium. **Key Clue**: Sudden onset mental status change. **Best Answer**: D. HIV test. **Why It Is Correct**: Sudden mental status change points to **delirium**. Initial testing must rule out common acute causes like hypoglycemia, urinary tract infection, and hepatic encephalopathy. **HIV** testing is not an immediate emergency test for acute delirium. **Why the Other Choices Are Wrong**: * A. Serum glucose immediately rules out life-threatening hypoglycemia. * B. Urinalysis rules out urinary tract infection, a primary cause of geriatric delirium. * C. LFTs rule out hepatic encephalopathy and metabolic dysfunction. * D. This is the correct choice. **Test-Taking Pearl**: Prioritize immediate metabolic and infectious labs when evaluating acute delirium. Question 8. Question: When considering treatment for a 71-year-old man with mild to moderate depression, the PMHNP considers all of the following except: * A. Medication should be started at a low dose and escalated as needed. * B. Electroconvulsive therapy should be avoided in those over age 65. * C. Renal and hepatic function should be assessed before initiating pharmacotherapy. * D. Medications with less anticholinergic effect should be preferred. **Quick Answer**: Electroconvulsive therapy is safe and effective in older adults over 65 years of age. **Key Clue**: Avoided in those over age 65. **Best Answer**: B. Electroconvulsive therapy should be avoided in those over age 65. **Why It Is Correct**: **Electroconvulsive therapy** (**ECT**) is safe, effective, and well-tolerated in adults over **65** for severe or treatment-resistant depression. **Why the Other Choices Are Wrong**: * A. Starting low and going slow is standard practice in geriatric prescribing. * B. This is the correct choice. * C. Assessing organ clearance via renal and hepatic function is required before prescribing. * D. Minimizing anticholinergic burden prevents cognitive decline and falls. **Test-Taking Pearl**: ECT is a safe first-line consideration for severe geriatric depression. Next Study Step. Review **Fitzgerald Chapter 14: Differential Diagnosis and Subtypes of Neurocognitive Disorders** next [1-3]. This study step cements the diagnostic distinctions between **Alzheimer's disease**, **Vascular NCD**, **Lewy Body disease**, and **Frontotemporal NCD**, preventing classic board traps on subtype differentiation [2, 3]. Next. New section. Delirium: Criteria and Clinical Features. Topic. DSM-5-TR Diagnostic Criteria for Delirium. Quick Answer. **Delirium** is an acute, fluctuating disturbance in attention, awareness, and cognition caused by an underlying medical condition, substance intoxication, withdrawal, or toxin exposure. It develops rapidly over hours to days and represents a direct medical emergency requiring immediate identification and treatment of the underlying etiology. Bottom Line. - **Diagnostic Timeline**: Symptoms develop abruptly over hours to days with a fluctuating course that often worsens at night (sundowning). - **Core Diagnostic Feature**: Reduced ability to direct, focus, sustain, or shift attention and reduced orientation to the environment. - **Cognitive Disturbance**: Memory deficits, disorientation, language impairment, or visuospatial dysfunction not explained by pre-existing neurocognitive disorders. - **Physical Etiology**: Required evidence that symptoms are the direct physiological consequence of a medical condition, substance toxicity, or withdrawal. - **Motor Subtypes**: Hyperactive (25%), hypoactive (25%), mixed (35%), or no motor change (15%). Hypoactive delirium is most frequently missed. - **High Prevalence**: Occurs in up to 80% of geriatric ICU admissions and up to 40% of nursing home residents. - **NCD Acceleration**: Delirium episodes accelerate the progression of underlying **major neurocognitive disorder**, and repeated delirium is a key clue to undetected dementia. Must Know for Boards. DSM-5-TR Diagnostic Criteria. - **Criterion A**: Disturbance in attention (reduced ability to direct, focus, sustain, and shift attention) and awareness (reduced orientation to the environment). - **Criterion B**: The disturbance develops over a short period of time (typically hours to a few days), represents a change from baseline attention and awareness, and tends to fluctuate in severity throughout the day. - **Criterion C**: An additional disturbance in cognition (memory deficit, disorientation, language, visuospatial ability, or perception). - **Criterion D**: The disturbances in Criteria A and C are not better explained by another pre-existing, established, or evolving neurocognitive disorder and do not occur in the context of a severely reduced level of arousal, such as coma. - **Criterion E**: Evidence from the history, physical examination, or laboratory findings that the disturbance is a direct physiological consequence of another medical condition, substance intoxication or withdrawal, exposure to a toxin, or multiple etiologies. Critical Signposts. - **Safety alert**: Delirium is a medical emergency with high mortality if unrecognized. Between one-third and two-thirds of cases are missed by clinicians. - **Board trap**: Assuming acute agitation or confusion in an older adult is worsening dementia or late-onset psychosis. Always rule out acute medical causes before diagnosing a primary psychiatric illness. - **First-line**: Immediate physical assessment, vital signs, and baseline laboratory workup (serum glucose, urinalysis, electrolytes, CBC, CMP, EKG) to identify and reverse the underlying medical cause. - **First-line non-pharmacologic intervention**: Reorientation, environmental calm, adequate hydration, pain management, and restoring sensory aids (glasses and hearing aids). Clinical Features and Etiology Mnemonic. Grouped Etiologies for the **DELIRIUM** Mnemonic: - **D - Drugs**: Addition of new medications, dose adjustments, or toxicity from **systemic anticholinergics**, **tricyclic antidepressants**, **first-generation antihistamines**, **first-generation antipsychotics**, **opioids**, **benzodiazepines**, or alcohol. - **E - Emotional or Electrolyte**: Severe depression or bereavement; **hyponatremia** and other acute electrolyte imbalances. - **L - Low oxygen or Lack of drugs**: Hypoxemia from pneumonia, **COPD**, **myocardial infarction**, or **pulmonary embolism**; withdrawal from alcohol or sedatives. - **I - Infection**: Urinary tract infection (**UTI**) and **community-acquired pneumonia** are the two most common infectious triggers in older adults. - **R - Retention or Reduced sensory input**: Urinary or fecal retention; loss of eyeglasses or hearing aids. - **I - Ictal state**: Post-ictal state or alcohol withdrawal seizures. - **U - Undernutrition or Dehydration**: Protein-calorie malnutrition, **vitamin B12** or folate deficiency, and volume depletion. - **M - Metabolic or Myocardial**: Uncontrolled diabetes, **hypothyroidism**, **hyperthyroidism**, acute MI, heart failure, or cardiac dysrhythmias. - **S - Subdural hematoma**: Results from minor head trauma due to brain atrophy and fragile bridging veins. Comparing Delirium and Neurocognitive Disorders. - **Onset**: Delirium is abrupt over hours to days. **Major neurocognitive disorder** is insidious over months to years. - **Course**: Delirium fluctuates hour to hour. Dementia is slow and progressive. - **Attention**: Delirium severely impairs attention and level of consciousness early. Dementia preserves attention until advanced stages. - **Reversibility**: Delirium is potentially reversible once the underlying cause is resolved. Dementia is chronic and irreversible. Board-Style Practice Questions. Question 1. A 74-year-old male is brought into the clinic for evaluation after recent erratic behavior, including confusion that can last a few hours at a time up to three times per day over the past month. The caregiver reports that he recently started to take a new medication. Which of the following medications is least likely to cause these episodes? - A) Diphenhydramine - B) Sertraline - C) Haloperidol - D) Diazepam Pause. Answer: B **Quick Answer**: Sertraline is an SSRI and is the least likely of the choices to precipitate acute delirium. **Key Clue**: The stem describes fluctuating episodes of confusion linked to a new medication, which defines drug-induced delirium. **Best Answer**: B. Sertraline **Why It Is Correct**: **Sertraline** is a selective serotonin reuptake inhibitor with minimal anticholinergic activity and is not a common primary precipitant of delirium. In contrast, anticholinergics, sedatives, and high-potency psychotropics frequently trigger delirium in older adults. **Why the Other Choices Are Wrong**: - **A**: **Diphenhydramine** is a first-generation antihistamine with potent anticholinergic activity that strongly precipitates delirium. - **C**: **Haloperidol** can cause motor restlessness, sedation, or paradoxical confusion in older adults. - **D**: **Diazepam** is a long-acting benzodiazepine that impairs cognitive function and frequently induces delirium in aging central nervous systems. **Test-Taking Pearl**: When asked which drug is least likely to cause delirium, eliminate agents with strong anticholinergic, sedative, or GABAergic properties first. Question 2. Which of the following is least essential to the workup for acute mental status change in an older adult? - A) Head CT scan - B) Complete blood count - C) Comprehensive metabolic panel - D) EKG Pause. Answer: A **Quick Answer**: A head CT scan is least essential as an initial diagnostic step compared to systemic laboratory and cardiac screening. **Key Clue**: The phrase "acute mental status change" points to delirium, which is far more commonly caused by metabolic, infectious, or cardiac triggers than structural brain lesions. **Best Answer**: A. Head CT scan **Why It Is Correct**: Initial delirium evaluation prioritizes rapid, non-invasive screening for systemic causes like infection, electrolyte imbalance, hypoglycemia, or cardiac ischemia. Neuroimaging with a **head CT scan** is reserved for cases with focal neurological deficits, recent head trauma, or unrevealing initial lab workups. **Why the Other Choices Are Wrong**: - **B**: A **complete blood count** is essential to evaluate for systemic infection or leukocytosis. - **C**: A **comprehensive metabolic panel** is essential to check electrolytes, renal function, hepatic function, and glucose. - **D**: An **EKG** is essential to evaluate for silent myocardial infarction, ischemia, or dysrhythmias causing reduced cerebral perfusion. **Test-Taking Pearl**: On board exams, always rule out systemic metabolic, infectious, and cardiac causes before ordering specialized brain imaging for acute confusion. Question 3. When assessing a 73-year-old woman with sudden onset mental status change, all of the following initial diagnostic tests would be essential, except: - A) Serum glucose level - B) Urinalysis - C) Liver function tests - D) HIV test Pause. Answer: D **Quick Answer**: An HIV test is not an essential initial test for sudden onset mental status change in an older adult. **Key Clue**: "Sudden onset mental status change" indicates acute delirium, requiring rapid evaluation of immediate medical causes. **Best Answer**: D. An HIV test **Why It Is Correct**: **HIV testing** evaluates chronic infections rather than acute, rapidly evolving medical emergencies. Initial emergency delirium workup focuses on common, reversible acute metabolic and infectious causes such as hypoglycemia, urinary tract infection, or hepatic dysfunction. **Why the Other Choices Are Wrong**: - **A**: **Serum glucose level** is essential to rule out acute hypoglycemia, a life-threatening cause of sudden confusion. - **B**: A **urinalysis** is essential to screen for a urinary tract infection, one of the most frequent triggers of delirium in older women. - **C**: **Liver function tests** are essential to evaluate for hepatic encephalopathy or systemic metabolic dysfunction. **Test-Taking Pearl**: Focus initial diagnostic testing on high-probability acute medical conditions (UTI, hypoglycemia, electrolyte disturbances) rather than low-yield chronic infection screens. Next. Topic. Table: Clinical Assessment of Delirium. Bottom Line. - **Onset timeline**: Delirium features an abrupt onset developing over hours to days with hour-to-hour fluctuating severity and impaired attention [1, 2]. - **Epidemiology numbers**: Between 33% and 66% of delirium cases go unrecognized; incidence reaches up to 80% in geriatric ICU admissions and up to 40% in nursing home residents [3, 4]. - **Psychomotor subtypes**: Mixed psychomotor presentation occurs in 35% of cases, hyperactive in 25%, hypoactive in 25%, and no psychomotor change in 15% [5, 6]. - **Diagnostic criteria**: Core features require a disturbance in attention and awareness developing rapidly, representing a acute decline from baseline, caused by direct physiological triggers, medical illness, or drug toxicity [1, 7]. - **Medication precipitants**: High-risk precipitants include anticholinergics like **diphenhydramine**, sedatives like **diazepam**, and typical antipsychotics like **haloperidol**, whereas SSRIs like **sertraline** are least likely to precipitate delirium. - **Initial diagnostic workup**: Prioritize serum glucose, urinalysis, CBC, CMP, and EKG to identify acute physical causes before ordering a head CT scan or HIV testing. - **Cognitive trajectory**: Delirium is reversible once the medical cause resolves, but repeated delirium episodes accelerate the progression of underlying major neurocognitive disorders [8, 9]. Clinical Assessment of Delirium. Core Features and Cognitive Assessment. Assessment of **delirium** focuses on acute cognitive changes, impaired attention, and fluctuating levels of consciousness evaluated during the Mental Status Examination [1, 10]. Patients demonstrate an inability to sustain focus or complete basic attentional tasks, such as serial 7s or spelling backward source 3. During the examination, patients frequently drift off to sleep, lose track of questions, or show sudden shifts in alertness source 3. **Safety alert**: Hypoactive delirium occurs in 25% of patients and is frequently missed because patients appear quiet, passive, or lethargic source 5. Missing hypoactive delirium delays medical treatment for underlying infections or metabolic crises, leading to higher mortality. **Board trap**: Confusing acute delirium with progressing dementia. Dementia features an insidious onset over months to years with stable alertness, whereas **delirium** presents with abrupt onset over hours to days, a fluctuating course, and marked inattention [1, 2, 9]. Epidemiology and Etiology. Up to two-thirds of delirium cases remain unrecognized in clinical practice source 3. Prevalence spans up to 80% among geriatric intensive care unit patients and up to 40% among nursing home residents source 4. Delirium is precipitated by acute medical illnesses, drug toxicities, or metabolic disturbances outlined in the DELIRIUM etiology mnemonic source 4. **First-line**: When an older adult presents with acute confusion, the initial clinical priority is stabilizing physical safety, assessing oxygenation, and searching for underlying reversible medical causes before administering psychotropic medications [4, 11]. Psychomotor and Speech Patterns. Psychomotor activity changes significantly during delirium, falling into four clinical subgroups source 5: - **Mixed presentation**: Accounts for 35% of cases, fluctuating between hyperactive agitation and hypoactive lethargy source 5. - **Hyperactive presentation**: Accounts for 25% of cases, featuring agitation, hyperalertness, and restlessness source 5. - **Hypoactive presentation**: Accounts for 25% of cases, featuring lethargy, psychomotor slowing, and apathy source 5. - **Unchanged motor activity**: Accounts for 15% of cases, maintaining normal motor speed despite severe inattention [5, 6]. Speech content in delirium becomes incoherent and disorganized source 6. Patients frequently use inappropriate words, misname familiar objects, and misidentify caregivers or healthcare staff source 6. Perceptual disturbances, particularly visual hallucinations, are common source 6. Sleep-wake cycles are disrupted, producing hour-to-hour variability and worsening symptoms in the late afternoon or evening, known as sundowning [9, 12]. Sample Board Practice Questions. Question 1. A 74-year-old male is brought into the clinic for evaluation after recent erratic behavior, including confusion that can last a few hours at a time up to three times per day over the past month. The caregiver reports that he recently started to take a new medication. Which of the following medications is least likely to cause these episodes? A) **Diphenhydramine** B) **Sertraline** C) **Haloperidol** D) **Diazepam** Pause. Answer: B. **Why it is correct**: **Sertraline** is a selective serotonin reuptake inhibitor and is the least likely of the listed agents to precipitate acute fluctuating delirium or cognitive confusion in an older adult. **Why the other choices are wrong**: - A) **Diphenhydramine** has potent anticholinergic properties that frequently cause acute delirium, urinary retention, and cognitive impairment in elderly patients. - C) **Haloperidol** can cause severe extrapyramidal symptoms, paradoxical agitation, and sedation in older adults. - D) **Diazepam** is a long-acting benzodiazepine that causes sedation, motor ataxia, and cognitive delirium in geriatric populations. Question 2. Which of the following is least essential to the workup for acute mental status change? A) Head CT scan B) Complete blood count C) Comprehensive metabolic panel D) Electrocardiogram Pause. Answer: A. **Why it is correct**: Acute mental status change signals **delirium**, which requires an immediate search for systemic, infectious, metabolic, or cardiac etiologies using a CBC, CMP, and EKG. A head CT scan is least essential as an initial diagnostic test unless focal neurological deficits or recent head trauma are present. **Why the other choices are wrong**: - B) Complete blood count is essential to evaluate for occult systemic infections, such as pneumonia or sepsis, or severe anemia driving delirium. - C) Comprehensive metabolic panel is essential to assess for electrolyte abnormalities, renal failure, hepatic dysfunction, or acute hypoglycemia. - D) Electrocardiogram is essential to rule out silent myocardial infarction, heart failure, or cardiac arrhythmias causing cerebral hypoperfusion. Question 3. When assessing a 73-year-old woman with sudden onset mental status change, all of the following initial diagnostic tests would be essential, except: A) Serum glucose level B) Urinalysis C) Liver function tests D) HIV test Pause. Answer: D. **Why it is correct**: Sudden onset mental status change indicates acute **delirium**. Initial testing must target common, rapidly reversible medical causes such as hypoglycemia, urinary tract infection, or hepatic encephalopathy. An HIV test is least essential during the initial emergency evaluation. **Why the other choices are wrong**: - A) Serum glucose level is essential because acute hypoglycemia or severe hyperglycemia directly causes sudden mental status changes. - B) Urinalysis is essential because urinary tract infections represent one of the most common medical causes of delirium in elderly women. - C) Liver function tests are essential to rule out hepatic dysfunction, elevated ammonia levels, or liver failure triggering acute encephalopathy. Next. End of this drive.