Koo 2005.

Methods	Randomised clinical trial
Participants	Country: South Korea Number randomised: 50 Postrandomisation dropouts: not stated Revised sample size: 50 Average age: 53 years Women: 14 (28%) Number of cirrhotics: not stated Number of major liver resections: 38 (76%) Number of right hepatectomies: 27 (54%) Follow‐up (months): until discharge Further details of methods of liver resection Vascular occlusion: No vascular occlusion. Parenchymal transection: factor being randomised Fibrin glue: not stated Pharmacological methods: not stated Cardiopulmonary methods: not stated Autologous transfusion: not stated Inclusion criteria: adults scheduled for elective hepatectomy Exclusion criteria Known cardiopulmonary diseases Patients with dysphagia Hiatal hernia Oesophageal disease
Interventions	Participants were randomly assigned to 2 groups. Group 1: clamp‐crush method (n = 25) Group 2: cavitron ultrasonic surgical aspirator (n = 25)
Outcomes	The outcomes reported were: proportion of people with any adverse events, operative blood loss, and operating time
Notes	—
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	Comment: this information was not available.
Allocation concealment (selection bias)	Unclear risk	Quote: "Randomization was performed by opening a sealed envelope before induction of anaesthesia". Comment: further information on sealed envelope system were not available.
Blinding of participants and personnel (performance bias) All outcomes	Unclear risk	Comment: this information was not available.
Blinding of outcome assessment (detection bias) All outcomes	Unclear risk	Comment: this information was not available.
Incomplete outcome data (attrition bias) All outcomes	Unclear risk	Comment: this information was not available.
Selective reporting (reporting bias)	High risk	Comment: mortality and morbidity were not reported.
Vested interest bias	Unclear risk	Comment: this information was not available.
Other bias	Low risk	Comment: no other bias