Meta-analysis of high- versus low-chloride content in perioperative and critical care fluid resuscitation

M L Krajewski, K Raghunathan, S M Paluszkiewicz, C R Schermer, A D Shaw, M L Krajewski, K Raghunathan, S M Paluszkiewicz, C R Schermer, A D Shaw

Abstract

Background: The objective of this systematic review and meta-analysis was to assess the relationship between the chloride content of intravenous resuscitation fluids and patient outcomes in the perioperative or intensive care setting.

Methods: Systematic searches were performed of PubMed/MEDLINE, Embase and Cochrane Library (CENTRAL) databases in accordance with PRISMA guidelines. Randomized clinical trials, controlled clinical trials and observational studies were included if they compared outcomes in acutely ill or surgical patients receiving either high-chloride (ion concentration greater than 111 mmol/l up to and including 154 mmol/l) or lower-chloride (concentration 111 mmol/l or less) crystalloids for resuscitation. Endpoints examined were mortality, measures of kidney function, serum chloride, hyperchloraemia/metabolic acidosis, blood transfusion volume, mechanical ventilation time, and length of hospital and intensive care unit stay. Risk ratios (RRs), mean differences (MDs) or standardized mean differences (SMDs) and confidence intervals were calculated using fixed-effect modelling.

Results: The search identified 21 studies involving 6253 patients. High-chloride fluids did not affect mortality but were associated with a significantly higher risk of acute kidney injury (RR 1.64, 95 per cent c.i. 1.27 to 2.13; P < 0.001) and hyperchloraemia/metabolic acidosis (RR 2.87, 1.95 to 4.21; P < 0.001). High-chloride fluids were also associated with greater serum chloride (MD 3.70 (95 per cent c.i. 3.36 to 4.04) mmol/l; P < 0.001), blood transfusion volume (SMD 0.35, 0.07 to 0.63; P = 0.014) and mechanical ventilation time (SMD 0.15, 0.08 to 0.23; P < 0.001). Sensitivity analyses excluding heavily weighted studies resulted in non-statistically significant effects for acute kidney injury and mechanical ventilation time.

Conclusion: A weak but significant association between higher chloride content fluids and unfavourable outcomes was found, but mortality was unaffected by chloride content.

© 2014 The Authors. BJS published by John Wiley & Sons Ltd on behalf of BJS Society Ltd.

Figures

Fig 1
Fig 1
PRISMA flow diagram showing study selection. RCT, randomized controlled trial; CCT, controlled clinical trial
Fig 2
Fig 2
Forest plot illustrating mortality risk following volume resuscitation with high-chloride versus low-chloride intravenous fluids. Where necessary, mortality incidence was derived from reported survival. A Mantel–Haenszel fixed-effect model was used for meta-analysis. Risk ratios are shown with 95 per cent c.i. RCT, randomized controlled trial; CCT, controlled clinical trial
Fig 3
Fig 3
Forest plot illustrating acute kidney injury (AKI)/renal failure risk following volume resuscitation with high-chloride versus low-chloride intravenous fluids. A Mantel–Haenszel fixed-effect model was used for meta-analysis. Risk ratios are shown with 95 per cent c.i. RCT, randomized controlled trial; CCT, controlled clinical trial
Fig 4
Fig 4
Forest plot illustrating hyperchloraemia/metabolic acidosis risk following volume resuscitation with high-chloride versus low-chloride intravenous fluids. A Mantel–Haenszel fixed-effect model was used for meta-analysis. Risk ratios are shown with 95 per cent c.i. RCT, randomized controlled trial; CCT, controlled clinical trial
Fig 5
Fig 5
Forest plot illustrating mean(s.d.) blood transfusion volume following volume resuscitation with high-chloride versus low-chloride intravenous fluids. All included studies reporting this endpoint were randomized controlled trials. An inverse-variance fixed-effect model was used for meta-analysis. Standardized mean differences (SMDs) are shown with 95 per cent c.i.

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