• Patrick C Bonasso, Melvin S Dassinger, Brady McLaughlin, Jeffrey M Burford, and Kevin W Sexton.
• Department of Pediatric Surgery, University of Arkansas for Medical Sciences, 1 Children's Way, Little Rock, AR.
• Mil Med. 2019 Mar 1; 184 (Suppl 1): 318-321.

AbstractVital signs are included in the determination of shock secondary to hemorrhage; however, more granular predictors are needed. We hypothesized that fast Fourier transformation (FFT) would have a greater percent change after hemorrhage than heart rate (HR) or systolic blood pressure (SBP). Using a porcine model, nine 17 kg pigs were hemorrhaged 10% of their calculated blood volume. Peripheral venous pressure waveforms, HR and SBP were collected at baseline and after 10% blood loss. FFT was performed on the peripheral venous pressure waveforms and the peak between 1 and 3 hertz (f1) corresponded to HR. To normalize values for comparison, percent change was calculated for f1, SBP, and HR. The mean percent change for f1 was an 18.8% decrease; SBP was a 3.31% decrease; and HR was a 0.95% increase. Using analysis of variance, FFT at f1 demonstrates a statistically significant greater change than HR or SBP after loss of 10% of circulating blood volume (p = 0.0023). Further work is needed to determine if this could be used in field triage to guide resuscitation.© The Author 2019. Published by Oxford University Press [on behalf of Association of Military Surgeons of the United States].

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