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Interpreting comparative died of wounds rates as a quality benchmark of combat casualty care

Patel, Shimul MD; Rasmussen, Todd E. MD; Gifford, Shaun M. MD; Apodaca, Amy N. MS; Eastridge, Brian J. MD; Blackbourne, Lorne H. MD

Journal of Trauma and Acute Care Surgery: August 2012 - Volume 73 - Issue 2 - p S60–S63
doi: 10.1097/TA.0b013e31826061b4
Clinical Research

BACKGROUND: The died of wounds (DOW) rate is cited as a measure of combat casualty care effectiveness without the context of injury severity or insight into lethality of the battlefield. The objective of this study was to characterize injury severity and other factors related to variations in the DOW rate.

METHODS: The highest monthly DOW (HDOW) and lowest monthly DOW (LDOW) rates from 2004 to 2008 were identified from analysis and casualty report databases and used to direct a search of the Joint Theater Trauma Registry. Casualties from the HDOW and LDOW were combined into cohorts, and injury data were analyzed and compared.

RESULTS: The HDOW rates were 13.4%, 11.6%, and 12.8% (mean, 12.6%), and the LDOW rates were 1.3%, 2.0%, and 2.7% (mean, 2.0%) (p < 0.0001). The HDOW (n = 541) and LDOW (n = 349) groups sustained a total of 1,154 wounds. Injury Severity Score was greater in the HDOW than the LDOW group (mean [SD], 11.1 [0.53] vs. 9.4 [0.58]; p = 0.03) as was the percentage of patients with Injury Severity Score of more than 25 (HDOW, 12% vs. LDOW, 7.7%; p = 0.04). Excluding minor injuries (Abbreviated Injury Scale score of 1), there was a greater percentage of chest injuries in the HDOW compared with the LDOW group (16.5% vs. 11.2%, p = 0.03). Explosive mechanisms were more commonly the cause of injury in the HDOW group (58.7% vs. 49.7%; p = 0.007), which also had a higher percentage of Marine Corps personnel (p = 0.02).

CONCLUSION: This study provides novel data demonstrating that the died of wounds rate ranges significantly throughout the course of combat. Discernible differences in injury severity, wounding patterns, and even service affiliation exist within this variation. For accuracy, the died of wounds rate should be cited only in the context of associated injury patterns, injury severity, and mechanisms of injury. Without this context, DOW should not be used as a comparative medical metric.

LEVEL OF EVIDENCE: Prognostic study, level III.

From the US Army Institute for Surgical Research, Brooke Army Medical Center, Fort Sam Houston, Texas.

This study was presented as an oral plenary session paper at the Advanced Technology Applications for Combat Casualty Care Conference in Fort Lauderdale, Florida, August 15–18, 2011.

The views and opinions expressed in this article are those of the authors and do not reflect the official policy or position of the US Air Force, US Army, US Navy, US Department of Defense, or the US Government.

Address for reprints: Todd E. Rasmussen, MD, US Institute of Surgical Research, Fort Sam Houston, Texas; email: todd.rasmussen@amedd.army.mil.

© 2012 Lippincott Williams & Wilkins, Inc.