OBEZ HASTALARDA LAPAROSKOPİK CERRAHİDE REKRUİTMENT MANEVRASI VE EŞİT ORANLI MEKANİK VENTİLASYON’UN (1:1) ETKİLERİNİN KARŞILAŞTIRILMASI

Abstract

In this study, we aimed to compare effects of Recruitment Maneuver and Equal Ratio (1:1) Mechanical Ventilation (ERMV), which are performed during laparoscopic bariatric surgery of obese patients under general anesthesia, on arterial blood gas, spirometry and hemodynamic parameters with routine ventilation technics and with each other. In this prospective study, 60 patients who had bariatric surgery with laparoscopic technics in general surgery clinics of Pamukkale University Medical Faculty Hospital, having ages between 18-65 years and BMI between 40-50, were randomly divided into 3 groups. [Group C (Control) n = 20, Group E (EOMV) n = 20, Group R (Recruitment) n = 20] Baseline ventilation was set to 8 mL/kg tidal volume (calculated in accordance with Adjusted Body Weight), 12 resp/min, PEEP of 5 cmH2O. The inspiratory pause and I/E were applied as 5% and 1:2 in Group C and R, 35% and 1:1 in Group E. In Group R, the recruitment maneuver was implemented in every 20 min starting immediately after intubation. Blood pressure, heart rate, SpO2, PetCO2, airway pressure, static compliance (with 20-minute intervals) and arterial blood gas (before preoperative induction [TP], 60th minutes [T60m], 100th minutes [T100m] after induction, postoperative 4th h [T4h] and 6th hr [T6h], in 5 different times) values were monitored. In comparison to preoperative values PaO2 rates in group C, E and R were 185.48%, 194.33% and 198.02% for T60m; 192.25%, 211.57% and 218.53% for T100m; changes in compliance rates based on T0m in T100m group were as 103.84%, 108.57% and 109.90%, respectively. According to these values, both methods have higher PaO2 than conventional methods with more pronounced values in recruitment group. In our study, using oxygenation and compliance as an indicator of atelectasis, recruitment and EOMV applications improved atelectasis. Moreover, presence of elevated PaO2 only in recruitment group have continued in 4th (116.32%) and 6th (115.04%) hours. Recruitment method has a greatest impact on hemodynamics with lowest hearth rate (HR) and arterial blood pressure values in all measurements. None of the groups needed vasopressors. No deterioration in pH and PaCO2 values was observed. No findings of barotrauma was observed in any case. With these results, we think that both EOMV and recruitment may be used with equal safety during laparoscopic surgery of obese patients. Use of combination of Inverse ratio mechanical ventilation, applied with optimized I/E and inspiratory pause for the case, PEEP and recruitment maneuver may lead to better results.