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Effect of Spinal Immobilization on Heart Rate, Blood Pressure and Respiratory Rate

Published online by Cambridge University Press:  25 March 2013

Stevan R. Bruijns ,
Henry R. Guly  and
Lee A. Wallis
Stevan R. Bruijns*
Affiliation:
Division of Emergency Medicine, University of Cape Town, Cape Town, South Africa Department of Emergency Medicine, Derriford Hospital, Plymouth, United Kingdom
Henry R. Guly
Affiliation:
Department of Emergency Medicine, Derriford Hospital, Plymouth, United Kingdom
Lee A. Wallis
Affiliation:
Division of Emergency Medicine, University of Cape Town, Cape Town, South Africa
*
Correspondence: Stevan R. Bruijns, FCEM Emergency Department Derriford Hospital Plymouth, PL6 8RY, United Kingdom E-mail [email protected]
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Abstract

Introduction

Vital signs remain important clinical indicators in the management of trauma. Tissue injury and ischemia cause tachycardia and hypertension, which are mediated via the sympathetic nervous system (SNS). Spinal immobilization is known to cause discomfort, and it is not known how this might influence the SNS and contribute to abnormal vital signs.

Hypothesis

This study aimed to establish whether the pain and discomfort associated with spinal immobilization and the maneuvers commonly used in injured patients (eg, log roll) affect the Heart rate (HR), Systolic Blood Pressure (SBP) and Respiratory rate (RR). The null hypothesis was that there are no effects.

Methods

A prospective, unblinded, repeated-measure study of 53 healthy subjects was used to test the null hypothesis. Heart rate, BP and RR were measured at rest (five minutes), after spinal immobilization (10 minutes), following log roll, with partial immobilization (10 minutes) and again at rest (five minutes). A visual analog scale (VAS) for both pain and discomfort were also collected at each stage. Results were statistically compared.

Results

Pain VAS increased significantly during spinal immobilization (3.8 mm, P < .01). Discomfort VAS increased significantly during spinal immobilization, after log roll and during partial immobilization (17.7 mm, 5.8 mm and 8.9 mm, respectively; P < .001). Vital signs however, showed no clinically relevant changes.

Discussion

Spinal immobilization does not cause a change in vital signs despite a significant increase in pain and discomfort. Since no relationship appears to exist between immobilization and abnormal vital signs, abnormal vital signs in a clinical situation should not be considered to be the result of immobilization. Likewise, pain and discomfort in immobilized patients should not be disregarded due to lack of changes in vital signs.

BruijnsS, GulyH, WallisL. Effect of Spinal Immobilization on Heart Rate, Blood Pressure and Respiratory Rate. Prehosp Disaster Med. 2013;28(2):1-5.

Keywords

blood pressurediscomfortheart ratehemorrhagepainrespiratory ratespinal immobilizationtraumavital signs
Type
Original Research
Information
Prehospital and Disaster Medicine , Volume 28 , Issue 3 , June 2013 , pp. 210 - 214
Copyright
Copyright © World Association for Disaster and Emergency Medicine 2013 

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