The Effects Of Prone Positioning On Cardiovascular Function In Patients During General Anesthesia

Objective To determine the hemodynamic effect of the prone position in patients during general anesthesia.Methods Sixty patients with ASA grade Ⅰ～Ⅱ undergoing elective spine surgey were choosed. All patients use the same anesthesia method and the same ventilation parameters. Through the right internal jugular vein puncture, monitoring the central venous pressure(CVP) were monitored. Mean blood pressure(MAP), cardiac output (CO), cardic index (CI), stroke volume (SV), stroke volume index (SVI), stroke volume variation(SVV), systemic vascular resistance(SVR), systemic vascular resistance index(SVRI) were monitored by FloTrac/Vigileo syetem.5minutes After induction and5,10,15minutes after prone position, the above data were collected.Results Compared with supine position, at each time point after prone position, the patient’s heart rate(HR), pulse oxygen saturation(spo2), partial pressure of carbon dioxide in end-expiratory gas (PETCO2) had no significant change (p>0.05);5、10and15minutes after prone position, patient’s systolic blood pressure (SBP)、 diastolic blood pressure (DBP)、mean arterial pressure (MBP) decreased,,the difference was statistically significant(p<0.05).Patient’s SBP、DBP、 MBP picked up slightly at10and15minutes after prone position than that at5minutes after prone position; Central venous pressure were increased after prone position, the difference was statistically significant(p<0.05); stroke volume variation was increased, the difference was statistically significant(p<0.05); the cardiac output (CO), cardic index (CI), stroke volume (SV), stroke volume index (SVI) decreased significantly after prone position(P<0.05), while systemic vascular resistance(SVR) and systemic vascular resistance index increased significantly after prone position(P<0.05).Conclusion We conclude that the prone position causes significant hemodynamic changes in mechanical ventilated patients with general anesthesia.