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Nancy Collop

All articles by Nancy Collop

Pulmonary Medicine

Central Sleep Apnea Syndrome (Idiopathic CSA, Cheyne-Stokes Respiration, CSA due to a drug or substance, High-altitude Periodic breathing, CSA due to a medical condition other than Cheyne-Stokes)

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What every physician needs to know: A Central Sleep Apnea (CSA) is defined as a cessation of breathing of at least ten seconds duration in the absence of a ventilatory drive. This is in contrast with Obstructive Sleep Apnea, where the ventilatory drive persists but airflow ceases because of the obstruction of the upper airway.…

Pulmonary Medicine

Obesity-Hypoventilation Syndrome

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What every physician needs to know: Obesity hypoventilation syndrome (OHS) is an acquired disorder characterized by the development of awake hypoventilation (paCO2>45mmHg) in individuals with a BMI above 30 kg/m2. Although obesity is a major criterion defining this syndrome, only some obese patients develop it. Before making the diagnosis, it is essential to rule out…

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