Hypopnea is defined as?: (A) > 10% reduction in airflow for at least 10 seconds with > 1% desaturation on arousal, (B) > 20% reduction in airflow for at least 10 seconds with > 2% desaturation on arousal, (C) > 30% reduction in airflow for at least 10 seconds with > 3% desaturation on arousal, (D) > 40% reduction in airflow for at least 10 seconds with > 4% desaturation on arousal
Answer is C. Hypopnea is defined as > 30% reduction in airflow for at least 10 seconds with > 3% desaturation on arousal.