comparison of the effect of pressure controlled ventilation and volume controlled ventilation on the degree of perioperative atelectasis in adults undergoing elective laparoscopic surgery under general anaesthesia using modified lung ultrasound score- a comparative randomised prospective observational trial

Perioperative atelectasis, a common complication of general anaesthesia, particularly in laparoscopic surgeries, was investigated in this study. the present study aimed to assess the impact of volume controlled ventilation (vcv) and pressure controlled ventilation (pcv) on perioperative atelectasis in individuals undergoing elective laparoscopic surgery under general anaesthesia (ga). in this comparative randomized prospective observational trial, thirty participants were assigned to each of the two groups. patients undergoing elective laparoscopic surgery under ga were randomly assigned to either the vcv or pcv group. the evaluation of perioperative atelectasis was conducted using the modified lung ultrasound score (lus). significant differences were observed between the pcv and vcv groups in preventing the development of atelectasis. notably, the mean difference in total lung ultrasonography scores at different time points was significant: pcv had a mean difference of 0.333 (p = 0.001), whereas vcv had a mean difference of 0.3333 (p = 0.001). moreover, both pcv and vcv showed statistically significant variations across different periods in comparing the median values of lus in dependent lung quadrants. in the pcv group, significant improvements in lung function were evident (p < 0.05). in the context of reducing perioperative atelectasis during laparoscopic surgery performed under general anaesthesia as evaluated by modified lung ultrasound scores, pcv emerges as the superior option compared to vcv.