Effects Of Smartcare And Other Mechanical Ventilation Models On Respiratory Mechanic Parameters In Chronic Obstructive Pulmonary Diseases

Objectives (1).To compare the respiratory mechanics of intermittent positive pressure ventilation(IPPV),biphasic-positive airway pressure(BIPAP) and autoflow by analysis parameters of Flow-volume curves , time capnogram and volumetric capnography. (2). To evaluate the effects of pressure ramp slop values on respiratory mechanics and inspiration termination criteria during pressure support ventilation(PSV).(3).To assess the respiratory mechanic of PSV with and without automatic tube compensation in ventilating patients with COPD . (4). To compare the outcome of the Smartcare and spontaneous breathing trails (SBT) for weaning patients with COPD.Methods (1). 21 patients with COPD were treated with IPPV ,BIPAP and autoflow.Parameters of resoiratory mechanics were recorded.(2).19 patients with COPD were treated with PSV . Parameters of resoiratory mechanics were recorded. (3). 38 patients with COPD were weaned with Smartcare and SBT.Results (1)The intrinsic positive end-expiratory pressure (PEEPi) in COPD is associated with the angle of peak expiratory flow and the end flow of expiratory. (2). BIPAP and autoflow can decrease the tracheal air pressure,improve the dynamic compliance of lung and increase the dead space .(3).The rapid of pressurization may decrease the inspiratory effort during pressure support ventilation in COPD patients. (4)The pressure ramp slop values has no effects on inspiration termination criteria during PSV. (5) PSV and ATC may increase the numbers of no-effective trigger and the numbers of high volume limited warning. (6)The Smartcare is better than SBT in weaning COPD men within 7 days.