Du Gres 1989.

Methods	Randomised controlled trial Blinding not mentioned No loss to follow‐up
Participants	30 patients post cardiac surgery. Patients were included if they were haemodynamically stable, were without serious 'rhythm' problems, had MAP < 90 mmHg, mean pulmonary artery pressure < 20 mmHg and CVP < 10 mmHg. Patients excluded if they needed blood transfusion, had a haematocrit < 28% or Hb < 9 g/100 mL
Interventions	1) 4% HA (n = 15) 2) Haemaccel (n = 15)
Outcomes	Haemodynamic parameters
Notes	Follow‐up 4 hours
Risk of bias
Bias	Authors' judgement	Support for judgement
Allocation concealment (selection bias)	Unclear risk	Unclear. No information given on method of randomisation