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About

Koichi Maruyama is an anesthesiologist and clinical researcher whose work centers on optimizing mechanical ventilation strategies for patients undergoing robot-assisted laparoscopic surgery. His primary research focus is the development and evaluation of inverse ratio ventilation (IRV) techniques—specifically pressure-controlled and volume-targeted modes—to improve lung function during pneumoperitoneum and steep Trendelenburg positioning. Maruyama’s key contributions include demonstrating that expiratory flow-initiated pressure-controlled inverse ratio ventilation (EF-initiated PC-IRV) can reduce physiological dead space and enhance lung protection compared to conventional volume-controlled ventilation. His 2018 study on PC-IRV’s effect on dead space during robot-assisted radical prostatectomy, cited 9 times, laid the groundwork for subsequent randomized trials. With a total of 20 citations across his most-cited works, Maruyama has systematically explored how inverse I:E ratios impact functional residual capacity, auto-PEEP, and ventilation-perfusion mismatch, particularly in obese patients. His 2022 investigation into volume-targeted PC-IRV further advanced understanding of how to maintain lung volumes under surgical stress. Maruyama’s work is notable for its translational relevance, directly informing clinical protocols to reduce postoperative pulmonary complications in minimally invasive surgery.