Effect of different pneumoperitoneum pressure on respiratory function of the patients undergoing laparoscopic surgery

Objective To discuss the effect of different pneumoperitoneum pressure on respiratory function of the patients undergoing laparoscopic surgery.Methods Sixty ASA I-Ⅱ patients scheduled for elective laparoscopic surgery were divided randomly into two groups(groupⅠand groupⅡ)with 30patients in each group.Pneumoperitoneum pressure of groupⅠ was set at 1.33-1.55kPa during operation,and that of groupⅡ was set at 1.06-1.20kPa.Respiratory parameters after general anaesthesia with tracheal intubation were set as follows:tidal volume was 10mL/kg,respiratory rate was 13times per minute,and inspiratory-expiratory ratio(I∶E)was 1∶2.Respectively at four time points:before insufflation(T0),10min after insufflation(T1),20min after insufflation(T2),and 10min after deflation(T3),we collected respiratory parameters(Pmax,Pmean),detected PaO2,PaCO2volumes in arterial blood and central venous blood through experimental verification.We counted intrapulmonary shunt(Qs/Qt),counted dynamic lung compliance through airway pressure.At last we comprehensively evaluated the data above.Results Pmax,Pmean,PaCO2and Qs/Qt at T1and T2were higher significantly than the data at T0(P0.05),and PaO2and Cdyn at T1and T2were lower significantly than the data at T0(P0.05).The change range between T0and T1,T2of groupⅠwas higher significantly than that of groupⅡ(P0.05).Conclusion Low pneumoperitoneum pressure in laparoscopic surgery has little effect on patients' respiratory system when the visual field of surgical procedure is satisfied.