Colloids versus crystalloids for fluid resuscitation in critically ill patients.
BACKGROUND
Colloid solutions are widely used in fluid resuscitation of critically ill patients. There are several choices of colloid and there is ongoing debate about the relative effectiveness of colloids compared to crystalloid fluids.


OBJECTIVE
To assess the effects on mortality of colloids compared to crystalloids for fluid resuscitation in critically ill patients.


METHODS
We searched the Injuries Group specialised register, Cochrane Controlled Trials Register, MEDLINE, EMBASE and BIDS Index to Scientific and Technical Proceedings, and checked reference lists of trials and review articles.


METHODS
All randomised and quasi-randomised trials of colloids compared to crystalloids, in patients requiring volume replacement. Cross-over trials and trials in pregnant women and neonates were excluded.


METHODS
Two reviewers independently extracted data and rated quality of allocation concealment. Trials with a 'double-intervention', such as those comparing colloid in hypertonic crystalloid to isotonic crystalloid, were analysed separately. The analysis was stratified according to colloid type and quality of allocation concealment.


RESULTS
Colloids compared to crystalloidsAlbumin or plasma protein fraction. Nineteen trials reported data on mortality, including a total of 7576 patients. The pooled relative risk (RR) from these trials was 1.02 (95% confidence interval [95% CI] 0.93 to 1.11). When the trial with poor quality allocation concealment was excluded, pooled RR was 1.01 (95% CI 0.92 to 1.10). Hydroxyethyl starch. Ten trials compared hydroxyethyl starch with crystalloids, including a total of 374 randomised participants. The pooled RR was 1.16 (95% CI 0.68 to 1.96). Modified gelatin. Seven trials compared modified gelatin with crystalloid, including a total of 346 randomised participants. The pooled RR was 0.54 (95% CI 0.16 to 1.85). Dextran. Nine trials compared dextran with a crystalloid, including a total of 834 randomised participants. The pooled relative risk was RR 1.24 (95% CI 0.94 to 1.65). Colloids in hypertonic crystalloid compared to isotonic crystalloidEight trials compared dextran in hypertonic crystalloid with isotonic crystalloid, including 1283 randomised participants. Pooled RR was 0.88 (95% CI 0.74 to 1.05).


CONCLUSIONS
There is no evidence from randomised controlled trials that resuscitation with colloids reduces the risk of death, compared to resuscitation with crystalloids, in patients with trauma, burns or following surgery. As colloids are not associated with an improvement in survival, and as they are more expensive than crystalloids, it is hard to see how their continued use in these patients can be justified outside the context of randomised controlled trials.
Roberts
I
I
Alderson
P
P
Bunn
F
F
Chinnock
P
P
Ker
K
K
Schierhout
G
G
D003102:Colloids / Q000627:therapeutic use*; D016638:Critical Illness / Q000628:therapy*; D005440:Fluid Therapy / Q000379:methods*; D006801:Humans; D010952:Plasma Substitutes / Q000627:therapeutic use*; D016032:Randomized Controlled Trials as Topic; D015532:Rehydration Solutions; D012151:Resuscitation / Q000379:methods
D003102:Colloids; D010952:Plasma Substitutes; D015532:Rehydration Solutions