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Letters
February 4, 2004

Mechanisms and Treatment of Obstructive Sleep Apnea

Author Affiliations
 

Letters Section Editor: Stephen J. Lurie, MD, PhD, Senior Editor.

JAMA. 2004;291(5):557. doi:10.1001/jama.291.5.557-a

To the Editor: Dr Shamsuzzaman and colleagues1 concluded that obstructive sleep apnea (OSA), which is often undiagnosed, can worsen cardiac and vascular disease. They also suggested that untreated OSA may decrease the effectiveness of conventional therapeutic strategies. Although the authors discussed several possible mechanisms that may occur during sleep, they did not address the effects of OSA on pulmonary hypertension and the right ventricle during wakefulness. Sanner et al,2 for instance, concluded that OSA can cause mild pulmonary hypertension even in the absence of pulmonary disease, which, in patients with normal left ventricular function, is strongly related to severity of OSA. In another study, Sanner et al3 reported that 18% of patients with OSA had impaired right ventricular ejection fraction, and that 95% of these patients had clinical signs or symptoms of mild right ventricular failure. Marrone and Bonsignore4 found that mild pulmonary hypertension may be present at rest in fewer than 50% of patients with OSA. Patients with OSA and pulmonary hypertension are more likely to have daytime hypoxemia and hypercapnia than are patients without pulmonary hypertension.5

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