Obstructive Sleep Apnea (OSA) - Pulmonary Disorders - Merck Manual Professional Edition
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During normal sleep, both airflow and heart rate remain steady, reflecting balanced autonomic control and a consistent oxygen supply. But during obstructive sleep apnea (OSA), airway collapse leads to: 👉 Interrupted nasal airflow: periods of apnea followed by gasping as breathing resumes 👉 Increased respiratory effort: chest and diaphragm working harder against obstruction 👉 Heart rhythm fluctuations: initial bradycardia during apnea, followed by a rebound tachycardia when airflow returns The
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Spirometry Simplified: Flow-Volume Loops You Must Know! Quick guide to Obstructive vs Restrictive patterns: 🟥 Obstructive Lung Disease (e.g., C.O.P.D.): F.E.V. one ↓↓↓ F.V.C. ↓ F.E.V. one / F.V.C. ratio
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