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Glasgow Coma Scale Scoring is Often Inaccurate

Published online by Cambridge University Press:  09 December 2014

Bryan E. Bledsoe ,
Michael J. Casey ,
Jay Feldman ,
Larry Johnson ,
Scott Diel ,
Wes Forred  and
Codee Gorman
Bryan E. Bledsoe*
Affiliation:
Department of Emergency Medicine and Department of Trauma Surgery, University of Nevada School of Medicine, Las Vegas, NevadaUSA MedicWest Ambulance/American Medical Response, Las Vegas, NevadaUSA
Michael J. Casey
Affiliation:
Department of Emergency Medicine and Department of Trauma Surgery, University of Nevada School of Medicine, Las Vegas, NevadaUSA
Jay Feldman
Affiliation:
Department of Emergency Medicine and Department of Trauma Surgery, University of Nevada School of Medicine, Las Vegas, NevadaUSA
Larry Johnson
Affiliation:
Department of Emergency Medicine and Department of Trauma Surgery, University of Nevada School of Medicine, Las Vegas, NevadaUSA MedicWest Ambulance/American Medical Response, Las Vegas, NevadaUSA
Scott Diel
Affiliation:
MedicWest Ambulance/American Medical Response, Las Vegas, NevadaUSA
Wes Forred
Affiliation:
Department of Emergency Medicine and Department of Trauma Surgery, University of Nevada School of Medicine, Las Vegas, NevadaUSA
Codee Gorman
Affiliation:
Department of Emergency Medicine and Department of Trauma Surgery, University of Nevada School of Medicine, Las Vegas, NevadaUSA
*
Correspondence: Bryan E. Bledsoe, DO Department of Emergency Medicine University of Nevada School of Medicine 901 Ranch Lane, Suite 135 Las Vegas, Nevada 89106 USA E-mail [email protected]
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Abstract

Introduction

The Glasgow Coma Scale (GCS) is widely applied in the emergency setting; it is used to guide trauma triage and for the application of essential interventions such as endotracheal intubation. However, inter-rater reliability of GCS scoring has been shown to be low for inexperienced users, especially for the motor component. Concerns regarding the accuracy and validity of GCS scoring between various types of emergency care providers have been expressed.

Hypothesis/Problem

The objective of this study was to determine the degree of accuracy of GCS scoring between various emergency care providers within a modern Emergency Medical Services (EMS) system.

Methods

This was a prospective observational study of the accuracy of GCS scoring using a convenience sample of various types of emergency medical providers using standardized video vignettes. Ten video vignettes using adults were prepared and scored by two board-certified neurologists. Inter-rater reliability was excellent (Cohen's κ = 1). Subjects viewed the video and then scored each scenario. The scoring of subjects was compared to expert scoring of the two board-certified neurologists.

Results

A total of 217 emergency providers watched 10 video vignettes and provided 2,084 observations of GCS scoring. Overall total GCS scoring accuracy was 33.1% (95% CI, 30.2-36.0). The highest accuracy was observed on the verbal component of the GCS (69.2%; 95% CI, 67.8-70.4). The eye-opening component was the second most accurate (61.2%; 95% CI, 59.5-62.9). The least accurate component was the motor component (59.8%; 95% CI, 58.1-61.5). A small number of subjects (9.2%) assigned GCS scores that do not exist in the GCS scoring system.

Conclusions

Glasgow Coma Scale scoring should not be considered accurate. A more simplified scoring system should be developed and validated.

BledsoeBE, CaseyMJ, FeldmanJ, JohnsonL, DielS, ForredW, GormanC. Glasgow Coma Scale Scoring is Often Inaccurate. Prehosp Disaster Med. 2015;30(1):1-8.

Keywords

emergency careEmergency Medical ServicesGlasgow Coma Scoretrauma care
Type
Original Research
Information
Prehospital and Disaster Medicine , Volume 30 , Issue 1 , February 2015 , pp. 46 - 53
Copyright
Copyright © World Association for Disaster and Emergency Medicine 2014 

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Footnotes

Conflicts of interest: none

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