Abstract Objective To evaluate the frequency, the change of sleep structure ,pulmonary function and respiratory muscle functions of overlap syndrome: a serious respiratory disease of sleep apnea syndrome (SAS) with...
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Abstract Objective To evaluate the frequency, the change of sleep structure ,pulmonary function and respiratory muscle functions of overlap syndrome: a serious respiratory disease of sleep apnea syndrome (SAS) with chronic obstructive pulmonary diseases (COPD), for the further study of clinical and experimental characteristics. Methods 44 consecutive, unselected SAS patients (39 males and 5 females) were analyzed. All received continuous and overnight polysomonography monitoring with HMS 5500 polysomnography system (Respironics Inc USA) in our sleep laboratory. A thorough and detailed collection of case history, physical examination, blood gas analysis and pulmonary functions, as well as respiratory muscle functions and right ventricular functions were taken before the polysomnographic examination. Results A chronic obstructive spirographic pattern, defined by a FEV1/VC ratio (60%,was observed in 16 of 44 SAS patients (36.3%, the overlap group). The overlap patients were older (62.6±12.5 vs 54.7±11.4 years) than the simple SAS patients. The number of heavy smokers in overlap group was more than that in simple SAS group (600±210 vs 550±127 cigarette year). There were signi ficant difference in FEV 1.0 % (58.70±4.76 vs 86.42±7.50%, P0.05), however, showed no significant difference between two groups, while the percentage of total sleep time/total recorded time (73.4±9.6 vs 87.6±8.8%, P<0.01), rapid eye movement sleep time/total sleep time (6.0±4.3 vs 8.9±5.8%, P<0.01) in the overlap g
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