Comparison of Volume-Controlled Ventilation (VCV) Mode and Pressure-Controlled Ventilation (PCV) Mode in Patients Undergoing Lumbar Spine Surgery in the Prone Position

Abstract

Abstract Background The prone position is commonly required to enable surgical access during lumbar spine surgery. When a patient moves into the prone position, inferior vena cava obstruction causes reduced venous return and increase thoracic pressure results in reduced left ventricular compliance, leading to a decreased cardiac index (CI). Aim of the Work The aim of this study, we will compare the effects of the VCV and PCV on peak airway pressure (P peak), ETCO2 as a primary outcome ABG, SPO2, and hemodynamics as MAP, HR and as a secondary outcome in the prone position. Patients and Methods This prospective, single blinded study included 60 patients who assigned randomly into two equal groups: group A: patients on volume-controlled ventilation mode VCV and group B: patients on pressure-controlled ventilation mode PCV. Results Baseline characteristics (age, sex, BMI, ASA physical status, duration of anesthesia and surgery) were insignificantly different between both groups. Heart rate and MAP at supine and prone positions at all time measurements were insignificantly different between both groups. P peak and SpO2 at supine and prone positions at all time measurements were insignificantly different between both groups. Respiratory rate and ETCO2 at supine and prone positions at all time measurements were insignificantly different between both groups. Conclusion No significant difference between two modes of ventilation VCV and PCV in patients undergoing lumbar spine surgery in the prone position as regard P peak, ETCO2, SPO2, and hemodynamics.