oxygen saturation and heart rhythm, as well as direct observation of patients during sleep.
The men were comparable in age, blood pressure and metabolic profiles, but the OSA patients had a higher bodymass index, though the difference was not statistically significant. The OSA patients also had more apoptotic cells circulating in their bloodstreams and had vasomotor dysfunction.
The OSA patients were given nasal CPAP treatment for eight weeks. Use of CPAP ranged from four to seven hours per night. At the end of the study, the patients vascular reactivity and circulating endothelial apoptotic cells were reevaluated and compared to the controls.
There were no significant differences in body measurements and metabolism in the men from baseline, but most of the patients who received CPAP had reduced circulating endothelial apoptotic cells and had marked improvements in brachial artery vascular reactivity.
The study had some limitations. Women were excluded to keep the study population homogeneous. Said Dr. El Sohl, a follow-up study would be required to look at this phenomenon in women and in particular the hormonal effect on apoptosis in OSA. The researchers did not perform a thorough assessment for excluding coronary disease.
More research is needed before these results can be applied clinically, according to Dr. El Sohl. While CPAP is currently used to treat OSA, looking for circulating apoptotic endothelial cells as a marker to fine-tune the therapy is one potential application. This may potentially reduce OSA patients risk of CVD. Dr. El Sohl mentioned that statins, angiotensin converting enzyme inhibitors, and vitamin C reduce enthothelial apoptosis, but it is not known if these agents could help patients with OSA.
According to Dr. El Sohl, further research will investigate if the improvements in vascular function correlate with actual improvements in the sleep patterns of patient
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