Aims: The relationship between bioelectrical impedance analysis (BIA) results and post-hepatectomy complications is unknown. This study aimed to identify the risk factors for post-hepatectomy complications from the BIA results.

Methods: This prospective, observational cohort study reviewed the data of patients who underwent hepatectomy between March 2018 and December 2022. The patients were matched using the following propensity score covariates: biliary enteric anastomosis and major hepatectomy. Risk factors for postoperative complications were investigated in a matched cohort.

Inclusion Criteria:

• clinical diagnosis of liver neoplasms

Exclusion Criteria:

• a body weight loss of >10% during the 6 months before surgery; the presence of distant metastases; or seriously impaired function of vital organs because of respiratory, renal, or heart disease

We prospectively reviewed consecutive patients who underwent hepatectomy at the Kochi Health Sciences Center. Patients who underwent hepatectomy, regardless of the underlying disease, between March 2018 and December 2022 were eligible for the study. Patients who did not undergo preoperative BIA were excluded. Those who underwent repeat hepatectomies were included; however, if they underwent more than two hepatectomies in the study period, only the clinical features during the first hepatectomy period were included and those during the second or third hepatectomy period were excluded.