Comparative Study of Volume Controlled Ventilation Mode (VCV) and Pressure Controlled Ventilation Mode (PCV) Intra Operatively in Patient Undergoing Coronary Artery Bypass Graft Surgery (original) (raw)

Introduction: Despite numerous advances in anaesthesia, surgical techniques, and postoperative care for coronary artery bypass graft (CABG) surgery, postoperative pulmonary complications still account for postoperative morbidity. Primary aim of the study was to compare two modes of ventilation on gas exchange in form of PaO2/FiO2 ratio in intraoperative period at time of expected significant respiratory alterations during CABG surgery. We compared VCV and PCV mode intra operatively as both ventilation modes are standard of care. It was also intended to compare effects of these modes on lungs to diagnose significant respiratory changes with Chest X ray findings, and postoperative length of ICU stay. Material and methods: 60 patients posted for elective coronary artery bypass graft surgery (CABG) were divided into two groups. Group 1 (VCV group) and group 2(PCV) group divided by sequentially numbered opaque sealed envelope method. Baseline PaO2/FiO2 was observed before induction, half hour after induction, post cardiopulmonary bypass (CPB) and at the end of surgery noted. Postoperative chest x ray findings, length of postoperative ICU stay also compared within two groups. Results: In terms of demographic data both modes were comparable. After comparing both the modes it was observed that PaO2/FiO2 ratio was better in PCV group half hour after induction and after CPB the end of surgery while no significant difference between two modes on postoperative ray changes and length of ICU stay. Conclusion: Both the modes of ventilation can be used for CABG surgery with CPB which are standard of care where PCV mode offers better oxygenation in terms of PaO2/FiO2 at the end of the surgery after CPB.