However, the increase in RV volumes with the BiPAP system compared with PSV could result from the increase in after load, a decrease in contractility, or both With respect to the similar RVPSP in both weaning modes, the higher volumes with the BiPAP system indicate a rightward shift of the pressure volume curve compared with […]
First, during PSV, the end-expiratory pressure remained constant at the PEEP of 5 cm H2O, but the BiPAP system switches between a low (Plo) and a high (Phi) airway pressure level of 5 and 10 cm H2O, respectively. Therefore spontaneous breathing with the BiPAP system was performed at two different pressure levels. Since the duration […]
In the present study, the BiPAP system and PSV were performed successfully during weaning from the respirator in 22 patients after coronary artery bypass grafting. The main finding was a small but significant increase in RVEDV and RVESV and a significant depression in RVEF, while RV afterload increased significantly with the BiPAP system compared with […]
After measurements of RVPSP, the catheter was pulled back. When the injectate port was at the level of the tricuspid valve, the curve changed from the ventricular to the atrial pressure curve. The catheter was then pulled back 1 cm and was fixed. Now the injectate port was in the correct position within the right […]
As described by Baum et al, the BiPAP system is a combination of controlled ventilation and spontaneous breathing that is unrestricted in each period of the respiratory cycle. In an adjustable time sequence determining the inspiration:expiration ratio of mechanical support, the BiPAP system circuit switches between a low (Plo) and a high (Phi) airway pressure […]
Patient Selection Following approval by the Humans Investigations Committee of Ulm University and after obtaining written informed consent, 22 patients scheduled for elective coronary artery bypass grafting were investigated. There were 20 men and 2 women with a mean age of 63 years (range, 51 to 72 years). Coronary artery abnormalities included stenosis of the […]
Changes in intrathoracic pressure caused by intermittent positive airway pressure as well as positive end-expiratory pressure (PEEP) may influence left and in particular right ventricular (RV) function. Differences not only in the level of PEEP” but also in the tidal volume, the inspiration:expiration ratio, and the mode of ventilation’ have been shown to result in […]