Impact of obstructive ventilatory impairment on intraoperative bleeding during laparoscopic hepatectomy.

Abstract

An animal model of laparoscopic hepatectomy showed that bleeding from the hepatic vein is influenced by airway pressure. However, there are little research reports on how airway pressure leads to risks in clinical practice. The main objective of this study was to investigate the impact of preoperative forced expiratory volume % in 1s (FEV1.0%) on intraoperative blood loss in laparoscopic hepatectomy. All patients who underwent pure laparoscopic or open hepatectomy from April 2011 to July 2020 were classified into two groups by preoperative spirometry: those with obstructive ventilatory impairment (obstructive group; FEV1.0% < 70%) and those with normal respiratory function (ormal group; FEV1.0% ≥ 70%). Massive blood loss was defined as 400mL for laparoscopic hepatectomy. In total, 247 and 445 patients underwent pure laparoscopic and open hepatectomy, respectively. Regarding laparoscopic hepatectomy group, blood loss was significantly greater in the obstructive group (122 vs. 100mL, P = 0.042). Multivariate analysis revealed that high IWATE criteria which classify the surgical difficulty of laparoscopic hepatectomy (≥ 7, odds ratio (OR): 4.50, P = 0.004) and low preoperative FEV1.0% (< 70%, OR: 2.28, P = 0.043) were independent risk factors for blood loss during laparoscopic hepatectomy. In contrast, FEV1.0% did not affect the blood loss (522 vs. 605mL, P = 0.113) during open hepatectomy. Obstructive ventilatory impairment (low FEV1.0%) may affect the amount of bleeding during laparoscopic hepatectomy.