• Steven G Schauer, Michael D April, Allyson A Arana, Brit J Long, and Joseph K Maddry.
• Uniformed Services University of the Health Sciences, Bethesda, Maryland, USA; Departments of Anesthesiology and Emergency Medicine, University of Colorado School of Medicine, Aurora, Colorado, USA; Center for Combat and Battlefield (COMBAT) Research, University of Colorado School of Medicine, Aurora, Colorado, USA. Electronic address: steven.g.schauer.mil@health.mil.
• Am J Emerg Med. 2023 Nov 1; 73: 234.e3234.e7234.e3-234.e7.

IntroductionKetamine administration in patients experiencing or at risk for hypotension is common based upon the presumption of this agent's favorable hemodynamic profile. The Compensatory Reserve Measurement (CRM) is a novel algorithm that accurately tracks systemic adequacy for delivery of oxygen (DO2) to the tissues. We present a case series of trauma patients receiving ketamine with CRM measurements to offer insight into the DO2 during resuscitation.MethodsWe captured vital signs along with analog arterial waveform data from trauma patients meeting major activation criteria using a prospective study design. Study team members tracked interventions and vital signs including systolic blood pressure (SBP), mean arterial pressure (MAP), and heart rate (HR) throughout their emergency department stay.ResultsOur study included 8 patients who received ketamine for intubation or analgesia (20-300 mg) and had adequate data for analysis. Most were male (88%) with a median age of 28. The most common mechanisms of injury were motor vehicle collisions (MVCs) (38%) and gunshot wounds (38%). After ketamine administration SBP, MAP, and HR all increased while the CRM exhibited minimal change.ConclusionsSBP, MAP, and HR generally appeared to increase while the CRM remained unchanged. Our findings suggest that while standard vital sign measurements appear to increase, ketamine may not improve delivery of oxygen to the tissues. This warrants further study to better understand the effects of ketamine on hemodynamics.Published by Elsevier Inc.

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