Validation of a noninvasive monitor to continuously trend individual responses to hypovolemia

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Abstract

Background. Humans are able to compensate for significant blood loss with little change in traditional vital signs, limiting early detection and intervention. We hypothesized that the Compensatory Reserve Index (CRI), a new hemodynamic parameter that trends changes in intravascular volume relative to the individual patient’s response to hypovolemia, would accurately trend each subject’s progression from normovolemia to decompensation (systolic blood pressure < 80) and back to normovolemia in humans. Methods. Men and women, ages 19 years to 36 years, underwent stepwise (~333mL aliquot) removal and replacement of 20% blood volume (men, 15 mL/kg; women, 13 mL/kg) via a large bore intravenous (i. v.) line. During each experiment, subjects were monitored with four CipherOx CRI Tablets. Withdrawn blood was reinfused at the end of each experiment. Results. Forty-two subjects (24 men; 18 women) were enrolled in the study, of which 32 completed the protocol. Seven subjects became symptomatic and collapsed (systolic blood pressure < 80), six never achieving maximum blood loss; each was rescued with a saline infusion followed by reinfusion of their stored blood. The mean CRI at baseline for all 42 subjects was 0.9 ± 0.04. The mean CRI for the 32 subjects while asymptomatic at maximum blood loss was 0.611 ± 0.028. For the asymptomatic subjects, the average blood loss volume was 1018 mL ± 286 mL. In comparison, the mean CRI at maximum blood loss for the seven subjects who collapsed was 0.15 ± 0.007 and their average blood loss volume was 860 ± 183 mL. Mean CRI after reinfusion of blood was 0.89 ± 0.02. In addition symptomatic subjects demonstrated three times larger average decrease in CRI per liter of blood removed, 0.85 versus 0.28 for asymptomatic subjects. Conclusion. CRI trends change in intravascular volume relative to an individual’s response to hypovolemia and is sensitive to the differing risks associated with individuals’ differing tolerance to volume loss. (J Trauma Acute Care Surg. 2017;83: S104–S111. DOI: 10.1097/TA.0000000000001511. Copyright © 2017 Wolters Kluwer Health, Inc. All rights reserved.) Level of evidence. Prognostic study, level II.

About the authors

Steven L. Moulton

University of Colorado; Flashback Technologies (S.L.M., J.M.), Inc.

Author for correspondence.
Email: steven.moulton@childrenscolorado.org

MD, FACS, FAAP, Director, Pediatric Trauma and Burns, The Children’s Hospital, Professor of Surgery, University of Colorado, School of Medicine

B-323 Children’s Hospital Colorado 13123 E. 16th Ave. Aurora, CO 80045

United States

Jane Mulligan

Flashback Technologies (S.L.M., J.M.), Inc.

Email: fake@neicon.ru

PhD

Boulder, Colorado

United States

Maria Antoinette Santoro

Duke University

Email: fake@neicon.ru

Department of Anesthesiology (M.A.S., K.B., G.Z.G., D.M.L.), School of Medicine

Durham, North Carolina

United States

Khanh Bui

Duke University

Email: fake@neicon.ru

Department of Anesthesiology (M.A.S., K.B., G.Z.G., D.M.L.), School of Medicine

Durham, North Carolina

United States

Gregory Z. Grudic

Duke University

Email: fake@neicon.ru

PhD, Department of Anesthesiology (M.A.S., K.B., G.Z.G., D.M.L.), School of Medicine

Durham, North Carolina

United States

David MacLeod

Duke University

Email: fake@neicon.ru

Department of Anesthesiology (M.A.S., K.B., G.Z.G., D.M.L.), School of Medicine

Durham, North Carolina

United States

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