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Emergency and Acute Medicine – Sleep Apnea
Sleep apnea is a disorder characterized by repeated cessation of breathing during sleep, defined as apneic episodes lasting more than 10 seconds and often associated with brief arousals or oxygen desaturation greater than 3%. It is strongly associated with obesity, male sex over 40 years of age, upper airway abnormalities, hypothyroidism, smoking, and alcohol or sedative use. Sleep apnea is linked to serious comorbidities including cardiac dysrhythmias (especially atrial fibrillation), heart failure, myocardial infarction, stroke, hypertension, and increased risk of motor vehicle accidents.
Epidemiologically, sleep apnea affects approximately 9% of middle-aged men and 4% of middle-aged women, with up to 80% of moderate-to-severe cases remaining undiagnosed. There are three main types: obstructive sleep apnea (most common, ~84%), caused by upper airway collapse despite respiratory effort; central sleep apnea (~0.4%), due to lack of respiratory drive; and complex sleep apnea (~15%), which combines features of both.
Patients commonly present with excessive daytime sleepiness, loud snoring, irritability, poor concentration, depression, and decreased libido. Often, a bed partner reports witnessed apneic episodes. Physical findings may include obesity, hypertension, hypoxemia, large neck circumference, craniofacial abnormalities, macroglossia, enlarged tonsils, and signs of pulmonary hypertension such as elevated jugular venous pressure.
Initial evaluation in the emergency setting includes pulse oximetry, ECG, and chest radiography. Arterial blood gas (ABG) analysis is the best test to demonstrate hypercarbia and hypoxemia. However, definitive diagnosis requires polysomnography, which identifies more than five apneic episodes per hour and is typically arranged outside the ED.
Management in the emergency setting focuses on airway stabilization. Basic measures include chin lift or jaw thrust, supplemental oxygen, and airway adjuncts such as oral or nasal airways. Bag-valve-mask ventilation may be challenging and often requires a two-person technique. Continuous positive airway pressure (CPAP) is the standard treatment, acting as a pneumatic splint to maintain airway patency. BiPAP may be used in patients requiring higher pressures or with coexisting respiratory conditions.
Airway management can be particularly difficult in these patients due to anatomical factors such as excess pharyngeal tissue and higher Mallampati scores. Clinicians should prepare for difficult intubation, have alternative airway devices available (e.g., laryngeal mask airway, bougie), and be ready for surgical airway if needed. Sedatives should be avoided whenever possible, as they worsen airway obstruction.
Long-term management emphasizes CPAP compliance and weight loss, which significantly reduce blood pressure, metabolic complications, and cardiovascular risk. Dental devices and surgical options may be considered but are less predictable. Patients should be referred to primary care or a pulmonologist for further evaluation and management, and cardiology referral is appropriate if complications such as heart failure or arrhythmias are present.
Patients may be discharged if they maintain adequate oxygenation (>85%) with available home support and have low risk of deterioration. Admission is required for ventilatory failure, need for intubation, or hemodynamic instability. Key points include recognizing the increased risk of cardiovascular disease, avoiding sedatives, anticipating difficult airway management, and reinforcing the importance of CPAP adherence.
Sleep apnea is a disorder characterized by repeated cessation of breathing during sleep, defined as apneic episodes lasting more than 10 seconds and often associated with brief arousals or oxygen desaturation greater than 3%. It is strongly associated with obesity, male sex over 40 years of age, upper airway abnormalities, hypothyroidism, smoking, and alcohol or sedative use. Sleep apnea is linked to serious comorbidities including cardiac dysrhythmias (especially atrial fibrillation), heart failure, myocardial infarction, stroke, hypertension, and increased risk of motor vehicle accidents.
Epidemiologically, sleep apnea affects approximately 9% of middle-aged men and 4% of middle-aged women, with up to 80% of moderate-to-severe cases remaining undiagnosed. There are three main types: obstructive sleep apnea (most common, ~84%), caused by upper airway collapse despite respiratory effort; central sleep apnea (~0.4%), due to lack of respiratory drive; and complex sleep apnea (~15%), which combines features of both.
Patients commonly present with excessive daytime sleepiness, loud snoring, irritability, poor concentration, depression, and decreased libido. Often, a bed partner reports witnessed apneic episodes. Physical findings may include obesity, hypertension, hypoxemia, large neck circumference, craniofacial abnormalities, macroglossia, enlarged tonsils, and signs of pulmonary hypertension such as elevated jugular venous pressure.
Initial evaluation in the emergency setting includes pulse oximetry, ECG, and chest radiography. Arterial blood gas (ABG) analysis is the best test to demonstrate hypercarbia and hypoxemia. However, definitive diagnosis requires polysomnography, which identifies more than five apneic episodes per hour and is typically arranged outside the ED.
Management in the emergency setting focuses on airway stabilization. Basic measures include chin lift or jaw thrust, supplemental oxygen, and airway adjuncts such as oral or nasal airways. Bag-valve-mask ventilation may be challenging and often requires a two-person technique. Continuous positive airway pressure (CPAP) is the standard treatment, acting as a pneumatic splint to maintain airway patency. BiPAP may be used in patients requiring higher pressures or with coexisting respiratory conditions.
Airway management can be particularly difficult in these patients due to anatomical factors such as excess pharyngeal tissue and higher Mallampati scores. Clinicians should prepare for difficult intubation, have alternative airway devices available (e.g., laryngeal mask airway, bougie), and be ready for surgical airway if needed. Sedatives should be avoided whenever possible, as they worsen airway obstruction.
Long-term management emphasizes CPAP compliance and weight loss, which significantly reduce blood pressure, metabolic complications, and cardiovascular risk. Dental devices and surgical options may be considered but are less predictable. Patients should be referred to primary care or a pulmonologist for further evaluation and management, and cardiology referral is appropriate if complications such as heart failure or arrhythmias are present.
Patients may be discharged if they maintain adequate oxygenation (>85%) with available home support and have low risk of deterioration. Admission is required for ventilatory failure, need for intubation, or hemodynamic instability. Key points include recognizing the increased risk of cardiovascular disease, avoiding sedatives, anticipating difficult airway management, and reinforcing the importance of CPAP adherence.
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