CPAP Therapy Improves Obstructive Sleep Apnea and Insulin Resistance in Obese

Wednesday, June 15th, 2011 at 8:11 PM

Obstructive sleep apnea (OSA) is associated with obesity, insulin resistance (IR) and diabetes. Continuous positive airway pressure (CPAP) rapidly mitigates OSA in obese subjects but its metabolic effects are not well-characterized.

The researchers postulated that CPAP will decrease IR, ghrelin and resistin and increase adiponectin levels in this setting.

In a pre- and post-treatment, within-subject design, insulin and appetite-regulating hormones were assayed in 23 20 obese subjects with OSA before and after 6 months of CPAP use. Primary outcome measures included glucose, insulin, and IR levels.

Other measures included ghrelin, leptin, adiponectin and resistin levels. Body weight change were recorded and used to examine the lationship between glucose regulation and appetite-regulating hormones.

CPAP effectively improved hypoxia. However, subjects had increased insulin and IR. Fasting ghrelin decreased significantly while leptin, adiponectin and resistin remained unchanged. Forty percent of patients gained weight significantly. Changes in body weight directly correlated with changes in insulin and IR. Ghrelin changes inversely correlated with changes in IR but did not change as a function of weight.

Weight change rather than elimination of hypoxia modulated alterations in IR in obese patients with OSA during the first six months of CPAP therapy.

Author: Jose GarciaHossein SharafkhanehMax HirshkowitzRania ElkhatibAmir SharafkhanehCredits/Source: Respiratory Research 2011,
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