Snoring and Sleep Apnea — MCQs
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What is the minimum duration of apnea that defines Obstructive Sleep Apnea Syndrome (OSAS)?
Systemic effects of obstructive sleep apnea syndrome (OSAS) include all of the following except?
Airway noise originating in the nose, nasopharynx, and oropharynx is known as?
Which of the following conditions is treated by laser-assisted uvulopalatoplasty?
Muller's maneuver is used for what purpose?
Snoring and Sleep Apnea Indian Medical PG Practice Questions and MCQs
Question 11: What is the minimum duration of apnea that defines Obstructive Sleep Apnea Syndrome (OSAS)?
- A. Greater than 10 seconds (Correct Answer)
- B. Greater than 20 seconds
- C. Greater than 30 seconds
- D. Greater than 60 seconds
Explanation: **Explanation:** **1. Understanding the Correct Answer (A):** In clinical sleep medicine, an **apnea** is defined as the complete cessation of airflow through the nose and mouth for a duration of **10 seconds or more**. For a diagnosis of Obstructive Sleep Apnea Syndrome (OSAS), these episodes must occur repeatedly during sleep, typically associated with a drop in oxygen saturation ($SaO_2$) or an arousal from sleep. The 10-second threshold is the standardized international criterion used in Polysomnography (the gold standard investigation) to calculate the Apnea-Hypopnea Index (AHI). **2. Why Other Options are Incorrect:** * **Options B, C, and D:** While an apneic episode can certainly last 20, 30, or even 60 seconds (often seen in severe OSAS), these are not the *minimum* criteria for definition. Using these higher thresholds would fail to diagnose a significant majority of patients suffering from clinically relevant sleep-disordered breathing. **3. NEET-PG High-Yield Clinical Pearls:** * **Hypopnea:** Defined as a reduction in airflow (30-50%) for $\geq$ 10 seconds associated with oxygen desaturation ($\geq$ 3-4%) or arousal. * **AHI (Apnea-Hypopnea Index):** The number of apneas and hypopneas per hour of sleep. * Mild: 5–15 events/hr * Moderate: 15–30 events/hr * Severe: > 30 events/hr * **Gold Standard Treatment:** Continuous Positive Airway Pressure (**CPAP**). * **Most Common Site of Obstruction:** Retropalatal region (Oropharynx). * **Muller’s Maneuver:** A clinical test used to identify the site of collapse in the upper airway.
Question 12: Systemic effects of obstructive sleep apnea syndrome (OSAS) include all of the following except?
- A. Hypertension
- B. Cor pulmonale
- C. Aortic aneurysm (Correct Answer)
- D. Cardiac arrhythmia
Explanation: **Explanation:** Obstructive Sleep Apnea Syndrome (OSAS) is characterized by repetitive episodes of upper airway obstruction during sleep, leading to intermittent hypoxia, hypercapnia, and increased negative intrathoracic pressure. These physiological stressors trigger a cascade of systemic complications, primarily involving the cardiovascular and pulmonary systems. **Why Aortic Aneurysm is the Correct Answer:** While OSAS is a significant risk factor for various cardiovascular diseases, it is **not** a direct systemic effect or a recognized causative factor for **Aortic Aneurysm**. Aortic aneurysms are typically associated with atherosclerosis, cystic medial necrosis, Marfan syndrome, or chronic uncontrolled hypertension. While OSAS can worsen hypertension, it does not directly lead to the structural weakening of the aortic wall required for aneurysm formation. **Analysis of Incorrect Options:** * **Hypertension:** This is the most common systemic effect. Intermittent hypoxia triggers the sympathetic nervous system, leading to persistent elevation in blood pressure (often "non-dipping" nocturnal patterns). * **Cor Pulmonale:** Chronic nocturnal hypoxia leads to pulmonary vasoconstriction (Euler-Liljestrand reflex). Over time, this results in pulmonary hypertension and subsequent right ventricular failure (Cor Pulmonale). * **Cardiac Arrhythmia:** Fluctuations in autonomic tone and hypoxia predispose patients to arrhythmias, most commonly bradycardia, atrial fibrillation, and premature ventricular contractions. **High-Yield Clinical Pearls for NEET-PG:** * **Gold Standard Investigation:** Polysomnography (Sleep Study). * **Diagnosis:** Apnea-Hypopnea Index (AHI) > 5 per hour with symptoms, or > 15 per hour regardless of symptoms. * **Treatment of Choice:** CPAP (Continuous Positive Airway Pressure). * **Surgical Procedure:** Uvulopalatopharyngoplasty (UPPP) is the most common surgery, but success rates vary.
Question 13: Airway noise originating in the nose, nasopharynx, and oropharynx is known as?
- A. Stridor
- B. Stertor (Correct Answer)
- C. Both of the above
- D. None of the above
Explanation: **Explanation:** The correct answer is **Stertor**. This question tests the ability to differentiate between various types of noisy breathing based on the anatomical site of obstruction. **1. Why Stertor is Correct:** Stertor is defined as a heavy, snoring-type sound produced by vibrations in the **upper airway**—specifically the nose, nasopharynx, and oropharynx. It occurs due to obstruction or narrowing above the level of the larynx. Common causes include adenoid hypertrophy, tonsillar enlargement, or a peritonsillar abscess (Quinsy). Because it originates in the pharyngeal spaces, it is often described as "muffled" or "gurgling" (e.g., the "hot potato voice" in Quinsy). **2. Why the other options are incorrect:** * **Stridor:** This is a high-pitched, musical sound resulting from turbulent airflow through a narrowed **larynx or trachea**. Unlike stertor, stridor is associated with the lower part of the upper respiratory tract. It is further classified into: * *Inspiratory:* Supraglottic/Glottic (e.g., Laryngomalacia). * *Expiratory:* Tracheal/Bronchial (e.g., Foreign body). * *Biphasic:* Subglottic (e.g., Subglottic stenosis). * **Both/None:** These are incorrect because the anatomical distinction between pharyngeal (stertor) and laryngeal/tracheal (stridor) sounds is a fundamental principle in ENT diagnosis. **Clinical Pearls for NEET-PG:** * **Laryngomalacia** is the most common cause of congenital inspiratory stridor. * **Stertor** is the hallmark of snoring and Obstructive Sleep Apnea (OSA). * **Wheezing** is a polyphonic sound originating from the lower airways (bronchi/bronchioles), typically heard during expiration in conditions like asthma. * **Key distinction:** Stertor = "Snore-like" (Pharynx); Stridor = "High-pitched/Musical" (Larynx/Trachea).
Question 14: Which of the following conditions is treated by laser-assisted uvulopalatoplasty?
- A. Stammering
- B. Pharyngotonsillitis
- C. Snoring (Correct Answer)
- D. Cleft palate
Explanation: ***Snoring*** - **Laser-assisted uvulopalatoplasty (LAUP)** is a surgical procedure used to **reduce or eliminate snoring** by reshaping the uvula and soft palate. - This procedure helps to open the airway by removing excess tissue, thereby reducing vibrations that cause snoring. *Stammering* - Stammering, or stuttering, is a **speech disorder** characterized by repetitions or prolongations of sounds, syllables, or words. - Its treatment typically involves **speech therapy** and behavioral interventions, not surgical procedures like LAUP. *Pharyngotonsillitis* - Pharyngotonsillitis is an inflammation of the **pharynx and tonsils**, commonly caused by bacterial or viral infections. - Treatment usually involves **antibiotics** for bacterial infections or supportive care for viral infections, and in severe recurrent cases, a **tonsillectomy** may be performed, not LAUP. *Cleft palate* - A cleft palate is a birth defect where the roof of the mouth does not form completely, resulting in an **opening that can extend to the nasal cavity**. - Its treatment involves **reconstructive surgery** to close the opening, often performed in infancy, which is distinct from LAUP.
Question 15: Muller's maneuver is used for what purpose?
- A. To find degree of obstruction in sleep disordered breathing (Correct Answer)
- B. To find out opening of mouth
- C. To remove laryngeal foreign body
- D. To remove foreign body from ear
Explanation: ***To find degree of obstruction in sleep disordered breathing*** - **Muller's maneuver** involves a forced inspiratory effort against a closed glottis, leading to negative pharyngeal pressure. - This maneuver helps to diagnose and localize sites of **upper airway obstruction** during sleep, particularly in conditions like **obstructive sleep apnea (OSA)**. *To find out opening of mouth* - The opening of the mouth is assessed via direct observation or measurement of **interincisal distance**, not by Muller's maneuver. - This assessment is typically done to evaluate conditions like **trismus** or temporomandibular joint (TMJ) disorders. *To remove laryngeal foreign body* - **Laryngeal foreign bodies** are typically removed using direct laryngoscopy and forceps or, in cases of complete obstruction, the **Heimlich maneuver**. - Muller's maneuver would not be effective or safe for removing a foreign body. *To remove foreign body from ear* - Foreign bodies in the ear are removed using specialized instruments like **forceps**, **suction**, or **irrigation** by a healthcare professional. - Muller's maneuver is an airway assessment technique and has no role in ear foreign body removal.
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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