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Deprecated: Implicit conversion from float 229.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Surgery 2016 ; 159 (3): 947-59 Nephropedia Template TP
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Helicopter Transport Improves Survival Following Injury in the Absence of a Time Saving Advantage #MMPMID26603848
Surgery 2016[Mar]; 159 (3): 947-59 PMID26603848show ga
Background: Although survival benefits have been shown at the population level, it remains unclear what drives the outcome benefits for helicopter emergency medical services (HEMS) in trauma. While speed is often cited as the vital factor of HEMS, we hypothesized a survival benefit would exist in the absence of a time-savings over ground emergency medical services (GEMS). The objective was to examine the association of survival with HEMS compared to GEMS transport across similar prehospital transport times (PHTT). Methods: Retrospective cohort of scene HEMS and GEMS transports in the NTDB (2007?2012). Propensity score matching was used to match HEMS and GEMS subjects on the likelihood of HEMS transport. Subjects were stratified by PHTT in 5min increments. Conditional logistic regression determined the association of HEMS with survival across PHTT strata controlling for confounders. Transport distance was estimated from PHTT and average HEMS/GEMS transport speeds. Results: There were 155,691 HEMS/GEMS pairs matched. HEMS had a survival benefit over GEMS for PHTT between 6 and 30min. This benefit ranged from a 46% increase in odds of survival between 26?30min (AOR 1.46; 95%CI 1.11?1.93, p<0.01) to an 80% increase in odds of survival between 16?20min (AOR 1.80; 95%CI 1.52?2.03, p<0.01). This PHTT window corresponds to estimated transport distance between 14.3?71.3mi for HEMS and 3.3?16.6mi for GEMS. Conclusions: When stratified by PHTT, HEMS had a survival benefit concentrated in a window between 6?30min. Since there was no time-savings advantage for HEMS, these findings may reflect care delivered by HEMS providers.