Hecht‐Dolnik 2009.

Methods	Randomised controlled trial. Block randomisation with 8 patients in each block. Attending intensivists were blinded to randomisation
Participants	156 patients undergoing off‐pump coronary artery bypass grafting. Exclusion criteria: history of cardiac surgery, primary bleeding disorders, end‐stage renal disease, and pregnant patients
Interventions	1) 6% HES (n = 78) 2) 5% HA (n = 78)
Outcomes	Death PRBC transfused Haemodynamic variables
Notes	4 patients excluded after randomisation because they were converted to on‐pump surgery
Risk of bias
Bias	Authors' judgement	Support for judgement
Allocation concealment (selection bias)	Low risk	Adequate. 'Sealed envelopes, attending anaesthetist opened the envelope linked to the patient's study number in the operating room when the procedure was underway'