Methods Impedance Pneumoplethysmogram(IPG) and Impedance respirogram(IRG) were detected in 64 cases of patients with PHD,and investigate DMF rheogram positive rate,also analysed various parameters of IPG in positive and negative groups.

• 方法对64例肺心病患者进行呼吸阻抗图和肺阻抗图检测，分组统计膈肌疲劳图形阳性率；并对阳性组和阴性组进行肺阻抗图各参数比较。