Snoring and Sleep Apnea — MCQs
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What is the therapy of choice for sleep-apnea syndrome?
What Apnea-hypopnea index (AHI) value is used for the diagnosis of Obstructive Sleep Apnea-Hypopnea Syndrome (OSAHS) in the absence of symptoms?
A 50-year-old male patient, a smoker with obesity and hypertension, reports loud snoring and has more than 5 episodes of apnea per hour of sleep. What is the next best management for the improvement of his symptoms?
Which of the following statements is not true regarding obstructive sleep apnea?
Which of the following is NOT true about obstructive sleep apnea?
What is the most common cause of obstructive sleep apnea?
Which of the following is NOT associated with obstructive sleep apnea?
A 36-year-old obese man with hypertension and snoring, who is a known smoker, has 5 apnea/hypopnea episodes per hour on a sleep test. He was prescribed antihypertensives and advised to quit smoking. What is the next line of management?
The Epworth Sleepiness Scale is used for assessing:
Apnea, with reference to sleep apnea, is defined as breathing pauses lasting for a minimum of how many seconds?
Snoring and Sleep Apnea Indian Medical PG Practice Questions and MCQs
Question 1: What is the therapy of choice for sleep-apnea syndrome?
- A. Invasive ventilation
- B. Non-invasive ventilation (Correct Answer)
- C. Oxygen inhalation
- D. Use of respiratory stimulants
Explanation: **Explanation:** **1. Why Non-invasive Ventilation (NIV) is the Correct Choice:** The gold standard treatment for Obstructive Sleep Apnea (OSA) is **Continuous Positive Airway Pressure (CPAP)**, which is a form of non-invasive ventilation. The underlying pathophysiology of OSA is the collapse of the upper airway during sleep. CPAP acts as a **"pneumatic splint,"** providing constant positive pressure that keeps the pharyngeal airway open, preventing collapse and ensuring uninterrupted ventilation. **2. Why Other Options are Incorrect:** * **Invasive Ventilation:** This involves endotracheal intubation or tracheostomy. While a permanent tracheostomy is the most effective surgical cure for OSA (as it bypasses the obstruction), it is reserved for life-threatening cases due to its morbidity. It is not the first-line "therapy of choice." * **Oxygen Inhalation:** Oxygen may improve saturation but does not address the mechanical obstruction. In some patients, it can actually worsen hypercapnia (CO2 retention) by reducing the hypoxic respiratory drive. * **Respiratory Stimulants:** Drugs like acetazolamide or medroxyprogesterone have limited efficacy and significant side effects. They do not prevent the physical collapse of the airway, which is the primary issue in OSA. **3. NEET-PG High-Yield Pearls:** * **Gold Standard Diagnosis:** Overnight Polysomnography (Sleep Study). * **Apnea-Hypopnea Index (AHI):** Diagnostic if AHI >5 with symptoms, or AHI >15 regardless of symptoms. * **First-line Surgery:** Uvulopalatopharyngoplasty (UPPP) is the most common surgery, but CPAP remains the primary medical therapy. * **Friedman Staging:** Used to predict the success of UPPP based on palate position, tonsil size, and BMI.
Question 2: What Apnea-hypopnea index (AHI) value is used for the diagnosis of Obstructive Sleep Apnea-Hypopnea Syndrome (OSAHS) in the absence of symptoms?
- A. 5 episodes/hr
- B. 10 episodes/hr
- C. 15 episodes/hr (Correct Answer)
- D. 20 episodes/hr
Explanation: ### Explanation The diagnosis of **Obstructive Sleep Apnea-Hypopnea Syndrome (OSAHS)** is based on the **Apnea-Hypopnea Index (AHI)**, which measures the number of apnea and hypopnea events per hour of sleep recorded during polysomnography. According to the American Academy of Sleep Medicine (AASM) criteria, the diagnostic thresholds are: 1. **AHI ≥ 5 episodes/hr:** Diagnostic **ONLY IF** the patient has associated symptoms (e.g., daytime sleepiness, loud snoring, witnessed gasping) or co-morbidities (e.g., hypertension, ischemic heart disease). 2. **AHI ≥ 15 episodes/hr:** Diagnostic **regardless of the presence of symptoms**. In an asymptomatic patient, this higher threshold is required to confirm the syndrome. **Analysis of Options:** * **Option A (5 episodes/hr):** This is the minimum threshold for diagnosis, but it requires the presence of clinical symptoms. * **Option B (10 episodes/hr):** This value does not represent a standard diagnostic cutoff in current international guidelines. * **Option C (15 episodes/hr):** **Correct.** This is the definitive cutoff for diagnosing OSAHS in an asymptomatic individual. * **Option D (20 episodes/hr):** While this indicates moderate-to-severe OSAHS, it is not the minimum threshold for diagnosis. **High-Yield Clinical Pearls for NEET-PG:** * **Gold Standard Investigation:** Overnight Polysomnography (Sleep Study). * **Severity Grading:** * Mild: AHI 5–15 * Moderate: AHI 15–30 * Severe: AHI > 30 * **Epworth Sleepiness Scale:** A subjective tool used to measure daytime sleepiness. * **Treatment of Choice:** Continuous Positive Airway Pressure (CPAP) is the gold standard for moderate-to-severe OSAHS. * **Surgical Procedure:** Uvulopalatopharyngoplasty (UPPP) is the most common surgical intervention.
Question 3: A 50-year-old male patient, a smoker with obesity and hypertension, reports loud snoring and has more than 5 episodes of apnea per hour of sleep. What is the next best management for the improvement of his symptoms?
- A. Uvulopalatoplasty
- B. Continuous Positive Airway Pressure (CPAP) (Correct Answer)
- C. Weight reduction and diet control
- D. Mandibular repositioning surgery
Explanation: ### Explanation **Correct Answer: B. Continuous Positive Airway Pressure (CPAP)** The patient presents with the classic triad of Obstructive Sleep Apnea (OSA): obesity, hypertension, and loud snoring. The diagnosis is confirmed by the presence of **more than 5 episodes of apnea/hypopnea per hour** (Apnea-Hypopnea Index or AHI ≥ 5). **Why CPAP is the correct answer:** CPAP is the **gold standard and first-line treatment** for OSA. It acts as a "pneumatic splint," providing constant positive pressure that keeps the pharyngeal airway open during inspiration and expiration, preventing collapse. In a patient with comorbidities like hypertension and obesity, CPAP not only improves sleep quality but also significantly reduces cardiovascular risks. **Analysis of Incorrect Options:** * **C. Weight reduction and diet control:** While essential as a long-term lifestyle modification, it is considered **adjunctive therapy**. It is rarely sufficient as a standalone treatment for symptomatic OSA and takes time to show results; immediate management requires CPAP. * **A. Uvulopalatoplasty (UPPP):** This is a surgical option reserved for patients who fail CPAP or have specific anatomical obstructions. It has lower success rates compared to CPAP and carries surgical risks. * **D. Mandibular repositioning surgery:** This (or oral appliances) is typically reserved for mild OSA or patients who are intolerant to CPAP. **High-Yield Clinical Pearls for NEET-PG:** * **Gold Standard Diagnosis:** Overnight Polysomnography (Sleep Study). * **AHI Grading:** Mild (5–15), Moderate (15–30), Severe (>30 episodes/hour). * **Friedman Staging:** Used to predict the success of UPPP based on palate position, tonsil size, and BMI. * **Muller’s Maneuver:** A flexible nasopharyngoscopy technique used to identify the site of airway collapse.
Question 4: Which of the following statements is not true regarding obstructive sleep apnea?
- A. Associated with nocturnal asphyxia
- B. Alcoholism can act as a cofactor
- C. Patients are prone to hypertension
- D. Spirometry is diagnostic (Correct Answer)
Explanation: **Explanation:** Obstructive Sleep Apnea (OSA) is characterized by repetitive episodes of partial or complete upper airway obstruction during sleep. **Why Option D is the correct answer (False statement):** **Spirometry** is a pulmonary function test used to assess lung volumes and flow rates (primarily for COPD or Asthma); it is **not diagnostic** for OSA. The "Gold Standard" investigation for diagnosing OSA is **Polysomnography (Sleep Study)**. Polysomnography monitors multiple physiological parameters, including EEG, EOG, EMG, ECG, oxygen saturation, and airflow. An Apnea-Hypopnea Index (AHI) of >5 events per hour is typically diagnostic. **Analysis of other options:** * **Option A (True):** OSA involves repeated collapse of the pharyngeal airway, leading to **nocturnal asphyxia** (hypoxia and hypercapnia), which triggers arousal from sleep to restore airway patency. * **Option B (True):** **Alcohol** acts as a central nervous system depressant and a muscle relaxant. It reduces the tone of the genioglossus and other pharyngeal dilator muscles, significantly worsening airway collapse. * **Option C (True):** Chronic intermittent hypoxia and sympathetic nervous system activation lead to systemic inflammation and vasoconstriction. Consequently, OSA is a major independent risk factor for **systemic hypertension**, as well as pulmonary hypertension and cardiac arrhythmias. **High-Yield Clinical Pearls for NEET-PG:** * **Gold Standard Treatment:** CPAP (Continuous Positive Airway Pressure). * **Most common site of obstruction:** Retropalatal (Oropharynx). * **Muller’s Maneuver:** A clinical test (using flexible endoscopy) to identify the site of collapse. * **Epworth Sleepiness Scale:** Used to subjectively assess daytime somnolence. * **Surgical Procedure:** Uvulopalatopharyngoplasty (UPPP) is the most common surgery for selected cases.
Question 5: Which of the following is NOT true about obstructive sleep apnea?
- A. Females are affected more than males. (Correct Answer)
- B. It is commonly associated with hypertension.
- C. Daytime sleepiness is a common symptom.
- D. More than 5 episodes of apnea per hour is considered diagnostic.
Explanation: **Explanation:** **1. Why Option A is the Correct Answer (False Statement):** Obstructive Sleep Apnea (OSA) is significantly more common in **males** than in females (ratio approximately 2:1 to 3:1). The increased risk in men is attributed to higher rates of central obesity (neck circumference >17 inches) and the protective effect of progesterone in pre-menopausal women, which acts as a respiratory stimulant. Post-menopause, the incidence in women increases but rarely exceeds that of men. **2. Analysis of Other Options (True Statements):** * **Option B:** OSA is a well-established independent risk factor for **systemic hypertension**. Recurrent hypoxia and hypercapnia trigger sympathetic overactivity, leading to resistant hypertension. * **Option C:** **Excessive Daytime Sleepiness (EDS)** is the hallmark symptom. Fragmented sleep due to micro-arousals prevents the patient from reaching deep, restorative sleep stages (N3 and REM). * **Option D:** The diagnosis is confirmed via Polysomnography. An **Apnea-Hypopnea Index (AHI) ≥ 5 events per hour** associated with symptoms (like EDS or gasping) or an AHI ≥ 15 regardless of symptoms is diagnostic. **Clinical Pearls for NEET-PG:** * **Gold Standard Investigation:** Overnight Polysomnography (Sleep Study). * **Gold Standard Treatment:** Continuous Positive Airway Pressure (CPAP). * **Surgical Procedure of Choice:** Uvulopalatopharyngoplasty (UPPP), though success rates vary. * **Müller’s Maneuver:** Used during endoscopy to identify the site of airway collapse. * **Epworth Sleepiness Scale:** A subjective tool used to quantify daytime sleepiness.
Question 6: What is the most common cause of obstructive sleep apnea?
- A. Craniofacial abnormalities (Correct Answer)
- B. Hypothyroidism
- C. Alcoholism
- D. Acromegaly
Explanation: **Explanation:** Obstructive Sleep Apnea (OSA) is characterized by repetitive episodes of partial or complete upper airway obstruction during sleep. The fundamental pathophysiology involves a **narrowed upper airway** combined with the loss of muscle tone during REM sleep. **Why Craniofacial Abnormalities is the correct answer:** Among the options provided, **craniofacial abnormalities** (such as micrognathia, retrognathia, midface hypoplasia, and a narrow high-arched palate) are the most significant anatomical predispositions. These structural variations directly reduce the pharyngeal space, making the airway highly susceptible to collapse when pharyngeal dilator muscles relax. While obesity is the most common overall risk factor, in the context of specific medical/structural etiologies listed, craniofacial morphology is the primary driver of airway narrowing. **Analysis of Incorrect Options:** * **Hypothyroidism:** This is a secondary cause. It contributes to OSA via macroglossia and deposition of mucopolysaccharides in the upper airway, but it is less common than structural abnormalities. * **Alcoholism:** Alcohol acts as a risk factor/exacerbating factor by reducing upper airway muscle tone and depressing the arousal response, but it is not the primary "cause" of the underlying obstruction. * **Acromegaly:** This causes OSA due to macroglossia and soft tissue hypertrophy of the pharynx. While a classic association, it is a rare endocrine disorder compared to the prevalence of craniofacial variations. **High-Yield Clinical Pearls for NEET-PG:** * **Gold Standard Investigation:** Overnight Polysomnography (PSG). * **Diagnostic Criteria:** Apnea-Hypopnea Index (AHI) ≥ 5 per hour with symptoms, or AHI ≥ 15 per hour regardless of symptoms. * **Treatment of Choice:** CPAP (Continuous Positive Airway Pressure). * **Most common site of obstruction:** Retropalatal (followed by retroglossal). * **Muller’s Maneuver:** A clinical test using flexible nasopharyngoscopy to identify the level of airway collapse.
Question 7: Which of the following is NOT associated with obstructive sleep apnea?
- A. Acromegaly
- B. Obesity
- C. Male gender
- D. Protruding jaw (Correct Answer)
Explanation: **Explanation:** Obstructive Sleep Apnea (OSA) is characterized by repetitive episodes of partial or complete upper airway collapse during sleep. The correct answer is **Protruding jaw (Prognathism)** because it actually increases the dimensions of the oropharyngeal airway, making OSA less likely. **Why "Protruding Jaw" is the correct answer:** In contrast to a protruding jaw, the anatomical risk factor for OSA is **Retrognathism** (a recessed jaw) or **Micrognathism** (an abnormally small jaw). These conditions displace the tongue posteriorly, narrowing the posterior airway space and increasing the likelihood of collapse during muscle relaxation in sleep. **Analysis of Incorrect Options:** * **Obesity (Option B):** This is the most significant reversible risk factor. Excess fat deposition in the soft tissues of the neck (parapharyngeal fat) increases external pressure on the airway and reduces lung volume. * **Male Gender (Option C):** Men are 2–3 times more likely to have OSA than pre-menopausal women. This is attributed to differences in fat distribution (android pattern) and the protective effect of progesterone on upper airway dilator muscles in women. * **Acromegaly (Option A):** This endocrine disorder causes macroglossia (enlarged tongue) and soft tissue hypertrophy of the pharyngeal walls, significantly narrowing the airway lumen. **High-Yield Clinical Pearls for NEET-PG:** * **Gold Standard Investigation:** Overnight Polysomnography (Sleep Study). * **Diagnosis:** Apnea-Hypopnea Index (AHI) ≥ 5 events/hour with symptoms, or AHI ≥ 15 events/hour regardless of symptoms. * **Gold Standard Treatment:** Continuous Positive Airway Pressure (CPAP). * **Muller’s Maneuver:** A clinical test using flexible endoscopy to identify the specific site of airway collapse.
Question 8: A 36-year-old obese man with hypertension and snoring, who is a known smoker, has 5 apnea/hypopnea episodes per hour on a sleep test. He was prescribed antihypertensives and advised to quit smoking. What is the next line of management?
- A. Uvulopalatopharyngeoplasty
- B. Weight reduction and diet plan (Correct Answer)
- C. Nasal CPAP
- D. Mandibular repositioning sling
Explanation: ### Explanation The patient presents with symptoms suggestive of Obstructive Sleep Apnea (OSA), but his polysomnography shows an **Apnea-Hypopnea Index (AHI) of 5**. According to the American Academy of Sleep Medicine (AASM) guidelines, an AHI of 5–15 is classified as **Mild OSA**. **1. Why "Weight reduction and diet plan" is correct:** For mild OSA, conservative management is the first-line approach. Obesity is the most significant reversible risk factor for OSA as it leads to fat deposition in the parapharyngeal space, narrowing the airway. Weight loss reduces the collapse of the upper airway and can significantly lower the AHI, often curative in mild cases. Since the patient is obese and has mild symptoms, lifestyle modification is the most appropriate next step. **2. Why other options are incorrect:** * **Nasal CPAP:** This is the "Gold Standard" for **Moderate to Severe OSA** (AHI >15) or mild OSA with significant comorbidities/daytime sleepiness. It is not the immediate next step for a patient with an AHI of 5 who hasn't tried lifestyle changes. * **Uvulopalatopharyngeoplasty (UPPP):** This is a surgical intervention reserved for patients with anatomical obstruction who fail CPAP therapy. It is not a first-line treatment. * **Mandibular repositioning sling:** These oral appliances are alternatives for mild-to-moderate OSA in patients who are not obese or those who cannot tolerate CPAP, but they follow lifestyle modifications. **Clinical Pearls for NEET-PG:** * **AHI Grading:** Mild (5–15), Moderate (15–30), Severe (>30). * **Gold Standard Diagnosis:** Overnight Polysomnography (Level 1 study). * **Gold Standard Treatment:** CPAP (Continuous Positive Airway Pressure). * **Friedman Tongue Position:** Used to predict the success of UPPP surgery. * **Müller’s Maneuver:** Used during endoscopy to identify the site of airway collapse.
Question 9: The Epworth Sleepiness Scale is used for assessing:
- A. Body mass index
- B. Vital capacity in postoperative patients
- C. Sleep apnea (Correct Answer)
- D. Risk of embolism in perioperative patients
Explanation: **Explanation:** The **Epworth Sleepiness Scale (ESS)** is a validated, self-administered questionnaire used to measure a patient’s general level of **daytime sleepiness**. It is a crucial screening tool for **Obstructive Sleep Apnea (OSA)** and other sleep disorders like narcolepsy. 1. **Why Sleep Apnea is correct:** Patients with OSA experience fragmented sleep due to repetitive airway collapse and hypoxia. This leads to excessive daytime sleepiness (EDS). The ESS asks patients to rate their likelihood of falling asleep in eight different sedentary situations (e.g., watching TV, sitting in a car). A score **>10** is considered indicative of pathological sleepiness, warranting further investigation via Polysomnography (the gold standard). 2. **Why other options are incorrect:** * **Body Mass Index (BMI):** While high BMI is a major risk factor for OSA, it is a physical measurement ($kg/m^2$), not a scale assessed by the ESS. * **Vital Capacity:** This is measured using bedside spirometry to assess respiratory reserve, not sleepiness. * **Risk of Embolism:** This is typically assessed using the **Wells’ Criteria** or **Caprini Score**, which evaluate clinical risk factors for DVT and PE. **High-Yield Clinical Pearls for NEET-PG:** * **Gold Standard Investigation for OSA:** Polysomnography (Sleep Study). * **Apnea-Hypopnea Index (AHI):** Diagnostic if $\geq 5$ events/hour with symptoms, or $\geq 15$ events/hour regardless of symptoms. * **Müller’s Maneuver:** Used during endoscopy to identify the site of airway collapse. * **Treatment of Choice:** CPAP (Continuous Positive Airway Pressure). * **STOP-BANG Questionnaire:** Another high-yield screening tool for OSA risk.
Question 10: Apnea, with reference to sleep apnea, is defined as breathing pauses lasting for a minimum of how many seconds?
- A. 5 seconds
- B. 7 seconds
- C. 8 seconds
- D. 10 seconds (Correct Answer)
Explanation: **Explanation:** **1. Why the correct answer is right:** In the context of sleep medicine and ENT, **Apnea** is clinically defined as the complete cessation of airflow through the nose and mouth lasting for at least **10 seconds**. This duration is significant because it is typically the minimum time required to cause a measurable drop in blood oxygen saturation ($SaO_2$) or to trigger an arousal from sleep, disrupting the sleep architecture. This definition is standardized by the American Academy of Sleep Medicine (AASM) for calculating the Apnea-Hypopnea Index (AHI). **2. Why the incorrect options are wrong:** * **Options A, B, and C (5, 7, and 8 seconds):** While pauses in breathing of this duration can occur during sleep, they do not meet the diagnostic threshold for clinical apnea in adults. Shorter pauses are often considered physiological or "sub-clinical" and are not counted when diagnosing Obstructive Sleep Apnea (OSA). **3. Clinical Pearls & High-Yield Facts for NEET-PG:** * **Hypopnea:** Defined as a reduction in airflow (at least 30%) for $\geq$ 10 seconds, associated with $\geq$ 3-4% desaturation or arousal. * **Apnea-Hypopnea Index (AHI):** The total number of apneas and hypopneas per hour of sleep. * *Mild:* 5–15 * *Moderate:* 15–30 * *Severe:* > 30 * **Gold Standard Investigation:** Overnight Polysomnography (Sleep Study). * **Gold Standard Treatment:** CPAP (Continuous Positive Airway Pressure). * **Surgical Procedure of Choice:** Uvulopalatopharyngoplasty (UPPP), though success rates vary. * **Müller’s Maneuver:** A clinical test (flexible endoscopy while the patient inhales against a closed nose/mouth) used to identify the site of airway collapse.
Practice by Chapter
Pathophysiology of Sleep-Disordered Breathing
Practice Questions
Clinical Evaluation of Sleep Apnea
Practice Questions
Polysomnography
Practice Questions
Continuous Positive Airway Pressure
Practice Questions
Oral Appliances
Practice Questions
Uvulopalatopharyngoplasty
Practice Questions
Other Surgical Procedures for OSA
Practice Questions
Pediatric Obstructive Sleep Apnea
Practice Questions
Upper Airway Stimulation Therapy
Practice Questions
Complications of Sleep Apnea
Practice Questions
Outcomes Assessment in Sleep Surgery
Practice Questions
Multidisciplinary Management of Sleep Disorders
Practice Questions
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