Comparison of End Tidal Carbon Dioxide Level along the Time of Surgery between Pressure Support Ventilation versus Spontaneous Ventilation in General Anesthesia under Laryngeal Mask Airway in Breast Surgery: A Randomized Controlled Trial
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Abstract
Introduction: Laryngeal mask airway (LMA) can be ventilated with various modes. The most popular mode is spontaneous ventilation (SV). Nonetheless, pressure support ventilation (PSV) showed lower level of end tidal carbon dioxide in the previous studies. Objectives: To compare the level of end tidal carbon dioxide along the time of surgery between PSV and SV group. Methods: We enrolled 38 patients who scheduled for breast surgery underwent general anesthesia with LMA-Proseal™ in this randomized controlled trial. The patients were allocated in two groups, group P for PSV and group S for SV. Then, respiratory and hemodynamic parameters were recorded. Results: End tidal carbon dioxide along duration of surgery was not different in both groups. The peak inspiratory pressure (PIP) minus positive end expiratory pressure (PEEP) in group P was lower than group S (13.32±3.51 versus 18.89±6.33 cmH2 O; P = 0.002). Conclusion: Pressure support ventilation during general anesthesia under LMA-ProSeal™ in breast surgery appears to be as effective as spontaneous ventilation in gas exchange.
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