Sleep-related breathing disorders US Medical PG Practice Questions and MCQs
Practice US Medical PG questions for Sleep-related breathing disorders. These multiple choice questions (MCQs) cover important concepts and help you prepare for your exams.
Sleep-related breathing disorders US Medical PG Question 1: A 54-year-old man comes to the physician because of excessive daytime sleepiness for 5 months. He wakes up frequently at night, and his wife says his snoring has become louder. He is 180 cm (5 ft 10 in) tall and weighs 104 kg (230 lb); his BMI is 33 kg/m2. His pulse is 80/min and his respiratory rate is 11/min. His jugular venous pressure is 7 cm H2O. He has 2+ pitting edema of the lower legs and ankles. Arterial blood gas analysis on room air shows a pH of 7.42 and a PCO2 of 41 mm Hg. An x-ray of the chest shows normal findings. Which of the following is the most likely underlying cause of this patient's condition?
- A. Daytime alveolar hypoventilation
- B. Decreased levels of hypocretin-1
- C. Increased medullary ventilatory responsiveness
- D. Impaired myocardial relaxation
- E. Intermittent collapse of the oropharynx (Correct Answer)
Sleep-related breathing disorders Explanation: ***Intermittent collapse of the oropharynx***
- The patient's symptoms of **excessive daytime sleepiness**, frequent night awakenings, and **loud snoring** are classic signs of **obstructive sleep apnea (OSA)**.
- OSA is characterized by the **intermittent collapse of the oropharynx** during sleep, leading to obstructed airflow. His obesity (BMI 33 kg/m2) is a significant risk factor for OSA.
*Daytime alveolar hypoventilation*
- This would typically present with **elevated PCO2** on arterial blood gas, indicating CO2 retention. The patient's PCO2 of 41 mm Hg is within the normal range, ruling out significant daytime alveolar hypoventilation.
- While chronic severe OSA can eventually lead to obesity hypoventilation syndrome, the current ABG does not support this as the primary underlying cause.
*Decreased levels of hypocretin-1*
- **Decreased hypocretin-1** (also known as orexin) levels in the cerebrospinal fluid are a hallmark of **narcolepsy type 1**.
- While narcolepsy causes excessive daytime sleepiness, it is not associated with loud snoring or night awakenings due to respiratory effort, which are prominent in this patient.
*Increased medullary ventilatory responsiveness*
- **Increased medullary ventilatory responsiveness** would lead to an enhanced drive to breathe, often resulting in **hypocapnia (low PCO2)**, especially in response to metabolic acidosis or hypoxemia.
- This is contrary to the patient's normal PCO2 and clinical picture, which points towards an obstructive rather than a central ventilatory issue.
*Impaired myocardial relaxation*
- **Impaired myocardial relaxation** is a feature of **diastolic heart failure**, which could explain the elevated JVP and peripheral edema.
- However, it does not explain the primary presenting symptoms of excessive daytime sleepiness and loud snoring, which point directly to a sleep-related breathing disorder rather than primarily a cardiac issue.
Sleep-related breathing disorders US Medical PG Question 2: A 47-year-old man presents to his primary care physician for headaches. The patient states that he typically has headaches in the morning that improve as the day progresses. Review of systems reveals that he also experiences trouble focusing and daytime fatigue. The patient drinks 2 to 3 alcoholic beverages daily and smokes 1 to 2 cigarettes per day. His past medical history includes diabetes, hypertension, and hypercholesterolemia. His current medications include insulin, metformin, metoprolol, aspirin, and atorvastatin. His temperature is 98.7°F (37.1°C), blood pressure is 157/98 mmHg, pulse is 90/min, respirations are 15/min, and oxygen saturation is 99% on room air. Physical exam reveals a fatigued-appearing obese man with a BMI of 37 kg/m^2. Which of the following is the best initial step in management?
- A. CT scan of the head
- B. Uvulopalatopharyngoplasty
- C. Ibuprofen and follow up in 2 weeks
- D. Continuous positive airway pressure
- E. Weight loss (Correct Answer)
Sleep-related breathing disorders Explanation: ***Weight loss***
- This patient presents with classic features of **obstructive sleep apnea (OSA)**: **obesity (BMI 37)**, morning headaches that improve during the day, daytime fatigue, trouble focusing, and poorly controlled hypertension.
- While **polysomnography (sleep study)** would be the gold standard for confirming OSA diagnosis, among the given therapeutic options, **weight loss is the most appropriate initial conservative management step**.
- Even modest weight reduction (5-10% of body weight) can significantly reduce the **apnea-hypopnea index (AHI)**, improve symptoms, and enhance blood pressure control.
- Weight loss addresses the underlying pathophysiology and should be initiated regardless of other interventions pursued.
*Continuous positive airway pressure*
- **CPAP** is highly effective for moderate to severe OSA, but typically requires **formal diagnosis via polysomnography** before initiation and insurance coverage.
- While CPAP may ultimately be needed, weight loss can be initiated immediately and may reduce or eliminate the need for CPAP in some patients.
- CPAP also requires patient adherence and monitoring, making it less suitable as a first-line approach without confirmed diagnosis.
*CT scan of the head*
- While headaches are present, the clinical picture strongly suggests **OSA-related morning headaches** (due to nocturnal hypercapnia and hypoxia), not a primary intracranial pathology.
- The pattern of morning headaches that improve during the day is highly characteristic of OSA, not brain lesions or masses.
- Neuroimaging would be considered if red flags were present (focal neurologic deficits, papilledema, worst headache of life).
*Uvulopalatopharyngoplasty*
- This **surgical procedure** removes tissue from the soft palate and pharynx to enlarge the airway.
- It is reserved for patients who have **failed or cannot tolerate CPAP** and have specific anatomic abnormalities identified on examination.
- Surgery is never a first-line approach for OSA - conservative management and CPAP are always attempted first.
*Ibuprofen and follow up in 2 weeks*
- This approach only treats the **symptom** (headaches) without addressing the underlying **obstructive sleep apnea**.
- Delaying appropriate management of OSA leads to persistent symptoms, daytime dysfunction, and increased cardiovascular morbidity and mortality.
- Untreated OSA is associated with hypertension, arrhythmias, stroke, and myocardial infarction.
Sleep-related breathing disorders US Medical PG Question 3: A 65-year-old male with multiple comorbidities presents to your office complaining of difficulty falling asleep. Specifically, he says he has been having trouble breathing while lying flat very shortly after going to bed. He notes it only gets better when he adds several pillows, but that sitting up straight is an uncomfortable position for him in which to fall asleep. What is the most likely etiology of this man's sleeping troubles?
- A. Left-sided heart failure (Correct Answer)
- B. Amyotrophic lateral sclerosis (ALS)
- C. Obstructive sleep apnea
- D. Right-sided heart failure
- E. Myasthenia gravis
Sleep-related breathing disorders Explanation: ***Left-sided heart failure***
- The patient's inability to breathe while lying flat (orthopnea) and the relief obtained by elevating his head with pillows is a classic symptom of **left-sided heart failure**.
- In this condition, accumulation of fluid in the lungs (pulmonary congestion) due to the heart's inability to pump blood effectively leads to difficulty breathing, especially in the recumbent position.
*Amyotrophic lateral sclerosis (ALS)*
- ALS primarily affects **motor neurons**, leading to progressive muscle weakness, atrophy, and spasticity.
- While it can eventually cause respiratory muscle weakness, it typically presents with more generalized motor symptoms and does not specifically manifest as acute orthopnea relieved by elevating the head of the bed shortly after lying down.
*Obstructive sleep apnea*
- Obstructive sleep apnea is characterized by recurrent upper airway collapse during sleep, leading to **pauses in breathing** and loud snoring.
- While it can cause fragmented sleep and daytime sleepiness, the primary relief is not typically from simply adding pillows but rather from CPAP therapy or surgical interventions to open the airway.
*Right-sided heart failure*
- Right-sided heart failure primarily leads to **systemic venous congestion**, causing symptoms like peripheral edema, ascites, and jugular venous distension.
- It does not typically cause orthopnea as a primary symptom, as pulmonary congestion is not the predominant feature.
*Myasthenia gravis*
- Myasthenia gravis is an **autoimmune disorder** characterized by fluctuating weakness of voluntary muscles, which worsens with activity and improves with rest.
- While it can affect respiratory muscles in severe cases, leading to respiratory compromise, the symptom presentation is more varied than isolated orthopnea, and it does not typically manifest acutely only when lying flat to sleep.
Sleep-related breathing disorders US Medical PG Question 4: A 37-year-old man presents to his primary care physician because he has been experiencing episodes where he wakes up at night gasping for breath. His past medical history is significant for morbid obesity as well as hypertension for which he takes lisinopril. He is diagnosed with sleep apnea and prescribed a continuous positive airway pressure apparatus. In addition, the physician discusses making lifestyle and behavioral changes such as dietary modifications and exercise. The patient agrees to attempt these behavioral changes. Which of the following is most likely to result in improving patient adherence to this plan?
- A. Refer the patient to a peer support group addressing lifestyle changes
- B. Ask the patient to bring a family member to next appointment
- C. Provide follow-up appointments to assess progress in attaining goals (Correct Answer)
- D. Provide appropriate publications for the patient's educational level
- E. Inform the patient of the health consequences of not intervening
Sleep-related breathing disorders Explanation: ***Provide follow-up appointments to assess progress in attaining goals***
- **Regular follow-up appointments** provide accountability and opportunities to discuss progress, troubleshoot challenges, and reinforce motivation for lifestyle changes
- This approach fosters a **patient-centered relationship** where the physician actively participates in the patient's journey, increasing adherence
- Evidence supports that scheduled follow-up is one of the most effective interventions for improving adherence to chronic disease management plans
*Refer the patient to a peer support group addressing lifestyle changes*
- While peer support can be beneficial for some patients, it is **not universally effective** and might not be suitable for all patients, especially as a primary strategy for adherence
- The effectiveness of such groups varies widely based on the patient's personality and group dynamics, potentially leading to **inconsistent adherence**
*Ask the patient to bring a family member to next appointment*
- Involving family can be supportive, but it may not always be appropriate or desired by the patient and doesn't directly address the patient's individual motivation or challenges
- While family support can enhance adherence, this approach is supplementary rather than primary in effectiveness
*Provide appropriate publications for the patient's educational level*
- Providing educational materials is a good initial step, but information alone is often **insufficient to sustain long-term behavioral changes**
- Without active follow-up and personalized guidance, written materials can be easily forgotten or not fully implemented into daily life
*Inform the patient of the health consequences of not intervening*
- While explaining risks is crucial for informed consent and awareness, relying solely on **fear-based motivation** often has limited long-term effectiveness in promoting sustained behavioral change
- Patients are often aware of potential negative consequences, but this knowledge alone does not provide the practical support or strategies needed for adherence
Sleep-related breathing disorders US Medical PG Question 5: A 55-year-old man presents to the physician for the evaluation of excessive daytime sleepiness over the past six months. Despite sleeping 8–9 hours a night and taking a nap during the day, he feels drowsy and is afraid to drive. His wife complains of loud snoring and gasping during the night. His blood pressure is 155/95 mm Hg. BMI is 37 kg/m2. Oropharyngeal examination shows a small orifice and an enlarged tongue and uvula. The soft palate is low-lying. The examination of the nasal cavity shows no septal deviation or polyps. Examination of the lungs and heart shows no abnormalities. Polysomnography shows an apnea-hypopnea index of 20 episodes/h. The patient is educated about weight loss, exercise, and regular sleep hours and duration. Which of the following is the most appropriate next step in management?
- A. Continuous positive airway pressure (Correct Answer)
- B. Upper airway neurostimulation
- C. Supplemental oxygen
- D. Oral appliances
- E. Upper airway surgery
Sleep-related breathing disorders Explanation: ***Continuous positive airway pressure***
- This patient presents with symptoms and polysomnography findings consistent with **moderate to severe obstructive sleep apnea (OSA)** (apnea-hypopnea index of 20 episodes/h). **CPAP is the first-line treatment** for such cases.
- CPAP works by **delivering pressurized air** via a mask, creating a pneumatic splint that prevents the collapse of the upper airway during sleep, thereby reducing apneas and hypopneas.
*Upper airway neurostimulation*
- This therapy involves stimulating the **hypoglossal nerve** to activate upper airway muscles, improving airway patency.
- However, it is generally considered a **second-line treatment** for patients with moderate to severe OSA who **cannot tolerate or fail CPAP therapy**.
*Supplemental oxygen*
- While oxygen therapy can reduce nocturnal desaturation, it **does not address the underlying airway obstruction** that causes apneas and hypopneas.
- It might even **worsen apnea by blunting the ventilatory drive**, making it an inappropriate primary treatment for OSA.
*Oral appliances*
- **Mandibular advancement devices (MADs)** can be effective for **mild to moderate OSA**, or for patients with severe OSA who cannot tolerate CPAP.
- They work by repositioning the jaw and tongue forward to enlarge the pharyngeal space, but CPAP is generally more effective for the severity described.
*Upper airway surgery*
- Various surgical procedures, such as **uvulopalatopharyngoplasty (UPPP)**, aim to remove excess tissue in the pharynx to enlarge the airway.
- Surgery is typically reserved for patients who **fail or cannot tolerate CPAP and oral appliances** and are carefully selected based on anatomical considerations.
Sleep-related breathing disorders US Medical PG Question 6: A 35-year-old woman who was recently ill with an upper respiratory infection presents to the emergency department with weakness in her lower limbs and difficulty breathing. Her symptoms began with a burning sensation in her toes along with numbness. She claims that the weakness has been getting worse over the last few days and now involving her arms and face. Currently, she is unable to get up from the chair without some assistance. Her temperature is 37.0°C (98.6°F), the blood pressure is 145/89 mm Hg, the heart rate is 99/min, the respiratory rate is 12/min, and the oxygen saturation is 95% on room air. On physical examination, she has diminished breath sounds on auscultation of bilateral lung fields with noticeably poor inspiratory effort. Palpation of the lower abdomen reveals a palpable bladder. Strength is 3 out of 5 symmetrically in the lower extremities bilaterally. The sensation is intact. What is the most likely diagnosis?
- A. Guillain-Barré syndrome (Correct Answer)
- B. Adrenoleukodystrophy
- C. Myasthenia Gravis
- D. Multiple sclerosis
- E. Acute disseminated encephalomyelitis
Sleep-related breathing disorders Explanation: ***Guillain-Barré syndrome***
- The patient presents with **ascending paralysis** (weakness starting in lower limbs and progressing upwards to arms and face) following an **upper respiratory infection**, which is a classic presentation of GBS.
- The presence of **respiratory compromise** (difficulty breathing, diminished breath sounds, poor inspiratory effort), **dysautonomia** (palpable bladder due to urinary retention), and the pattern of **symmetrical weakness with intact sensation** are characteristic features of GBS.
- GBS typically presents with areflexia and shows albumino-cytologic dissociation on CSF analysis (elevated protein with normal cell count).
*Adrenoleukodystrophy*
- This is a rare, **X-linked genetic disorder** that primarily affects white matter in the brain and spinal cord, typically presenting in childhood with neurological deficits, not an acute ascending paralysis after an infection.
- It involves demyelination and adrenal insufficiency, which are not suggested by the acute onset and progressive neurological symptoms described.
*Myasthenia Gravis*
- Myasthenia gravis typically presents with **fluctuating muscle weakness** that worsens with activity and improves with rest, often affecting ocular and bulbar muscles first.
- The progression of weakness in this case is constant and ascending, not fluctuating, and there is no mention of characteristic findings like ptosis or diplopia.
*Multiple sclerosis*
- MS is characterized by **demyelinating lesions** in the central nervous system, leading to neurological symptoms that are often **disseminated in space and time**, meaning they affect different parts of the body at different times.
- While it can cause weakness, the acute onset of rapidly progressive, ascending, symmetrical paralysis following an infection is not typical for MS; MS symptoms are usually more insidious or relapsing-remitting.
*Acute disseminated encephalomyelitis*
- ADEM is an **acute inflammatory demyelinating disease** of the central nervous system that typically follows an infection or vaccination, but it usually presents with **encephalopathy** (altered mental status), multifocal neurological deficits, and often affects the brain and spinal cord diffusely.
- While it can cause weakness, the prominent ascending paralysis, intact sensation, and lack of encephalopathy make GBS a more fitting diagnosis.
Sleep-related breathing disorders US Medical PG Question 7: A 21-year-old woman presents into the clinic worried that she might be pregnant. Her last menstrual period was 4 months ago and recalls that she did have unprotected sex with her boyfriend, despite not having sexual desire. They have since broken up, and she would like to do a pregnancy test. She appears very emaciated but is physically active. She says that she spends a few hours in the gym almost every day but would spend longer if she was to stray from her diet so that she does not gain any weight. Her calculated BMI is 17 kg/m2, and her urine pregnancy test is negative. Which of the following additional findings would most likely be present in this patient?
- A. Hypocholesterolemia
- B. Orthostasis (Correct Answer)
- C. Primary amenorrhea
- D. Hypokalemic alkalosis
- E. Increased LH and FSH
Sleep-related breathing disorders Explanation: ***Orthostasis***
- This patient's presentation is highly suggestive of **anorexia nervosa** (BMI 17 kg/m2, amenorrhea, excessive exercise, fear of weight gain despite emaciation, and lack of sexual desire). **Orthostasis** (a drop in blood pressure upon standing) is a common finding due to **dehydration** and **volume depletion** often present in patients with anorexia nervosa.
- **Bradycardia** and **hypotension** (which contributes to orthostasis) are frequent cardiovascular complications of anorexia nervosa as the body attempts to conserve energy.
*Hypocholesterolemia*
- Patients with anorexia nervosa more commonly present with **hypercholesterolemia**, not hypocholesterolemia.
- This paradox is thought to be due to **decreased cholesterol degradation** and **impaired metabolism** in the setting of severe caloric restriction.
*Primary amenorrhea*
- The patient's last menstrual period was 4 months ago, indicating she has experienced menstruation in the past. Therefore, her amenorrhea is **secondary** (cessation of menses for 3 consecutive months in a woman who has previously menstruated), not primary (absence of menses by age 15 or within 5 years of thelarche).
- The **hypothalamic-pituitary-gonadal axis dysfunction** due to low body weight and nutritional deficiency leads to secondary amenorrhea in anorexia nervosa.
*Hypokalemic alkalosis*
- **Hypokalemic alkalosis** is typically associated with **purging behaviors** like vomiting or laxative abuse, which are characteristic of the bulimia nervosa subtype or the binge-eating/purging subtype of anorexia nervosa.
- While this patient's exercise is excessive, there is no direct evidence of purging in the provided vignette; her symptoms more strongly point towards the **restrictive subtype** of anorexia nervosa, where metabolic alkalosis is less common unless purging is also occurring.
*Increased LH and FSH*
- In anorexia nervosa, the severe caloric restriction and low body fat lead to **hypothalamic dysfunction**, specifically affecting the release of **gonadotropin-releasing hormone (GnRH)**.
- This results in **decreased production of LH and FSH** from the pituitary gland, leading to hypogonadotropic hypogonadism, which explains the amenorrhea.
Sleep-related breathing disorders US Medical PG Question 8: A 22-year-old college student comes to the physician because of depressed mood and fatigue for the past 5 weeks. He has been feeling sad and unmotivated to attend his college classes. He finds it particularly difficult to get out of bed in the morning. He has difficulty concentrating during lectures and often feels that he is less intelligent compared to his classmates. In elementary school, he was diagnosed with attention deficit hyperactivity disorder and treated with methylphenidate; he stopped taking this medication 4 years ago because his symptoms had improved during high school. He has smoked two packs of cigarettes daily for 8 years; he feels guilty that he has been unable to quit despite numerous attempts. During his last attempt 3 weeks ago, he experienced increased appetite and subsequently gained 3 kg (6 lb 10 oz) in a week. Mental status examination shows psychomotor retardation and restricted affect. There is no evidence of suicidal ideation. Which of the following is the most appropriate pharmacotherapy?
- A. Amitriptyline
- B. Bupropion (Correct Answer)
- C. Lithium carbonate
- D. Fluoxetine
- E. Valproic acid
Sleep-related breathing disorders Explanation: ***Bupropion***
- Bupropion is an antidepressant that works as a **norepinephrine-dopamine reuptake inhibitor**. It is particularly effective for patients with **depressed mood, fatigue, and difficulty concentrating**, as seen in this patient.
- It is also beneficial for **nicotine cessation**, which aligns well with the patient's history of heavy smoking and failed attempts to quit.
*Amitriptyline*
- Amitriptyline is a **tricyclic antidepressant (TCA)** that can be sedating and has significant anticholinergic side effects, which might worsen the patient's fatigue and concentration difficulties.
- TCAs are generally **not first-line** due to their side effect profile and risk in overdose compared to newer antidepressants.
*Lithium carbonate*
- Lithium is primarily used as a **mood stabilizer** for **bipolar disorder** and is not a first-line treatment for major depressive disorder without manic or hypomanic symptoms.
- This patient's symptoms are indicative of depression, not bipolar illness.
*Fluoxetine*
- Fluoxetine is a **selective serotonin reuptake inhibitor (SSRI)**, a common first-line treatment for depression, but it might not be the most appropriate choice given this patient's specific presentation.
- SSRIs can sometimes cause **fatigue or sexual dysfunction**, and they don't offer the added benefit for smoking cessation that bupropion does.
*Valproic acid*
- Valproic acid is an **anticonvulsant** primarily used as a **mood stabilizer** for bipolar disorder or for seizure control, not as a primary antidepressant in unipolar depression.
- There is no indication in the patient's history or presentation to suggest bipolar disorder or a seizure disorder.
Sleep-related breathing disorders US Medical PG Question 9: A 50-year-old man with severe obstructive sleep apnea (AHI 65 events/hour) and CPAP intolerance despite multiple mask trials undergoes maxillomandibular advancement surgery. Three months post-operatively, he continues to report excessive daytime sleepiness and his bed partner reports persistent snoring. Post-operative polysomnography shows AHI of 28 events/hour. He has a BMI of 38 kg/m² (unchanged from pre-surgery) and crowded posterior pharynx. Evaluate the next management strategy.
- A. Hypoglossal nerve stimulation therapy evaluation
- B. Repeat maxillomandibular advancement with greater advancement distance
- C. Observe for another 3 months as surgical swelling may still be resolving
- D. Revisit CPAP therapy with auto-adjusting pressure settings (Correct Answer)
- E. Proceed directly to tracheostomy for definitive airway management
Sleep-related breathing disorders Explanation: ***Revisit CPAP therapy with auto-adjusting pressure settings***
- **Maxillomandibular advancement (MMA)** significantly reduced the **Apnea-Hypopnea Index (AHI)** from 65 to 28; while not curative, this anatomical change may lower the **positive airway pressure (PAP)** requirements, potentially improving **patient tolerance**.
- **Auto-CPAP** is the most appropriate next step to determine if the post-surgical airway allows for successful treatment at manageable pressures, especially before considering more invasive options.
*Hypoglossal nerve stimulation therapy evaluation*
- This patient's **BMI of 38 kg/m²** currently exceeds the standard FDA-approved threshold of **35 kg/m²** for **hypoglossal nerve stimulation**.
- Evaluation requires a **Drug-Induced Sleep Endoscopy (DISE)** to check for **concentric palatal collapse**, but primary medical optimization remains the priority.
*Repeat maxillomandibular advancement with greater advancement distance*
- **Revision MMA** carries significantly higher surgical risks, including **nerve injury** and **non-union**, and is generally not indicated when initial surgery was technically successful.
- The persistent **AHI of 28** is more likely due to the patient's **persistent obesity** and soft tissue volume rather than inadequate bony advancement.
*Observe for another 3 months as surgical swelling may still be resolving*
- Three months is typically sufficient for the resolution of **post-operative edema** impacting the airway, and active treatment is needed for **moderate OSA** (AHI 28) and **daytime sleepiness**.
- Delaying management puts the patient at continued risk for **cardiovascular complications** and accidents associated with **excessive sleepiness**.
*Proceed directly to tracheostomy for definitive airway management*
- **Tracheostomy** is the most invasive surgical intervention and is reserved for **life-threatening OSA** where all other medical and surgical options have failed.
- It represents a significant **quality-of-life burden** and should not be considered until less invasive modalities like post-surgical **PAP therapy** are re-attempted.
Sleep-related breathing disorders US Medical PG Question 10: A 70-year-old man with newly diagnosed Parkinson disease and REM sleep behavior disorder is being considered for treatment. His neurologist is concerned about medication interactions and disease progression. He also has mild cognitive impairment, orthostatic hypotension, and a history of visual hallucinations. Evaluate the optimal therapeutic approach considering his complex medical profile.
- A. Quetiapine for both hallucinations and RBD symptoms
- B. Clonazepam 0.5 mg at bedtime with close monitoring for falls
- C. Rivastigmine to address cognitive impairment and sleep disturbance
- D. Melatonin 3-12 mg at bedtime as first-line therapy (Correct Answer)
- E. Pramipexole dose adjustment to suppress REM sleep
Sleep-related breathing disorders Explanation: ***Melatonin 3-12 mg at bedtime as first-line therapy***
- **Melatonin** is the preferred first-line treatment for **REM sleep behavior disorder (RBD)** in elderly patients with neurodegeneration due to its excellent safety profile.
- It effectively reduces **dream enactment** with a lower risk of side effects like **excessive sedation** or motor instability compared to other agents.
*Quetiapine for both hallucinations and RBD symptoms*
- While **Quetiapine** is used to manage **visual hallucinations** in Parkinson's, it is not an established or effective therapy for managing **RBD symptoms**.
- It may worsen **orthostatic hypotension** and daytime somnolence, complicating the patient's existing clinical state.
*Clonazepam 0.5 mg at bedtime with close monitoring for falls*
- **Clonazepam** is highly effective for RBD but is generally avoided in patients with **mild cognitive impairment** and **orthostatic hypotension** due to the high risk of **confusion** and **falls**.
- It can also exacerbate **obstructive sleep apnea** or cause significant **morning-after sedation** in the elderly.
*Rivastigmine to address cognitive impairment and sleep disturbance*
- **Rivastigmine**, a cholinesterase inhibitor, is used for **Parkinson disease dementia** but is not the primary treatment for **REM sleep behavior disorder**.
- Although it may help cognitive symptoms, it does not reliably suppress the physical **dream enactment** characteristic of RBD.
*Pramipexole dose adjustment to suppress REM sleep*
- **Dopamine agonists** like **Pramipexole** are known to potentially **worsen RBD** and can significantly increase the frequency of **visual hallucinations**.
- Increasing the dose in this patient would likely exacerbate his **psychosis** and **orthostatic hypotension**.
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