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Am J Emerg Med. 2007 Oct;25(8):938-41.

Utility of Stewart's strong ion difference as a predictor of major injury after trauma in the ED.

Author information

1
Department of Emergency Medicine, SUNY Downstate and Kings County Hospital, Brooklyn, NY 11203, USA.

Abstract

INTRODUCTION:

Base deficit (BD) is a validated surrogate for lactate in injured patients and correlates with trauma severity. Stewart proposed a more comprehensive measure of acidosis based on the strong ion difference (SID) (SID = Na + K + Mg + Ca - CL - lactate [mEq/L]). We compared operating characteristics of BD, anion gap (AG), and SID in identifying major injury in emergency department (ED) trauma patients.

METHODS:

This was a retrospective review. Major injury was defined as Injury Severity Score > or =15, blood transfusions, or significant drop in hematocrit. Receiver operating characteristic curves compared BD, AG, and SID in differentiating major from minor injuries.

RESULTS:

The study included 1181 patients. Both BD and SID were significantly (P = .0001) different after major vs minor injury (mean difference, 3.40; 95% confidence interval, 2.70-4.00 and mean difference, 2.50; 95% confidence interval, 1.90-3.10, respectively). Receiver operating characteristic curves were minimally different from one another (P = .0035).

CONCLUSION:

Stewart's SID can identify major injury in the ED.

PMID:
17920981
DOI:
10.1016/j.ajem.2007.02.031
[Indexed for MEDLINE]

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