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Accuracy of a novel ultrasound technique for confirmation of endotracheal intubation by expert and novice emergency physicians.
West J Emerg Med. 2014 Nov; 15(7):834-9.WJ

Abstract

INTRODUCTION

Recent research has investigated the use of ultrasound (US) for confirming endotracheal tube (ETT) placement with varying techniques, accuracies, and challenges. Our objective was to evaluate the accuracy of a novel, simplified, four-step (4S) technique.

METHODS

We conducted a blinded, randomized trial of the 4S technique utilizing an adult human cadaver model. ETT placement was randomized to tracheal or esophageal location. Three US experts and 45 emergency medicine residents (EMR) performed a total of 150 scans. The primary outcome was the overall sensitivity and specificity of both experts and EMRs to detect location of ETT placement. Secondary outcomes included a priori subgroup comparison of experts and EMRs for thin and obese cadavers, time to detection, and level of operator confidence.

RESULTS

Experts had a sensitivity of 100% (95% CI = 72% to 100%) and specificity of 100% (95% CI = 77% to 100%) on thin, and a sensitivity of 93% (95% CI = 66% to 100%) and specificity of 100% (95% CI = 75% to 100%) on obese cadavers. EMRs had a sensitivity of 91% (95% CI = 69% to 98%) and of specificity 96% (95% CI = 76% to 100%) on thin, and a sensitivity of 100% (95% CI = 82% to 100%) specificity of 48% (95% CI = 27% to 69%) on obese cadavers. The overall mean time to detection was 17 seconds (95% CI = 13 seconds to 20 seconds, range: 2 to 63 seconds) for US experts and 29 seconds (95% CI = 25 seconds to 33 seconds; range: 6 to 120 seconds) for EMRs. There was a statistically significant decrease in the specificity of this technique on obese cadavers when comparing the EMRs and experts, as well as an increased overall time to detection among the EMRs.

CONCLUSION

The simplified 4S technique was accurate and rapid for US experts. Among novices, the 4S technique was accurate in thin, but appears less accurate in obese cadavers. Further studies will determine optimal teaching time and accuracy in emergency department patients.

Authors+Show Affiliations

Cook County Hospital, Chicago, Illinois.Cook County Hospital, Chicago, Illinois.Cook County Hospital, Chicago, Illinois.Cook County Hospital, Chicago, Illinois.Cook County Hospital, Chicago, Illinois.Cook County Hospital, Chicago, Illinois.Cook County Hospital, Chicago, Illinois.Cook County Hospital, Chicago, Illinois.

Pub Type(s)

Journal Article
Randomized Controlled Trial

Language

eng

PubMed ID

25493129

Citation

Gottlieb, Michael, et al. "Accuracy of a Novel Ultrasound Technique for Confirmation of Endotracheal Intubation By Expert and Novice Emergency Physicians." The Western Journal of Emergency Medicine, vol. 15, no. 7, 2014, pp. 834-9.
Gottlieb M, Bailitz JM, Christian E, et al. Accuracy of a novel ultrasound technique for confirmation of endotracheal intubation by expert and novice emergency physicians. West J Emerg Med. 2014;15(7):834-9.
Gottlieb, M., Bailitz, J. M., Christian, E., Russell, F. M., Ehrman, R. R., Khishfe, B., Kogan, A., & Ross, C. (2014). Accuracy of a novel ultrasound technique for confirmation of endotracheal intubation by expert and novice emergency physicians. The Western Journal of Emergency Medicine, 15(7), 834-9. https://doi.org/10.5811/westjem.22550.9.22550
Gottlieb M, et al. Accuracy of a Novel Ultrasound Technique for Confirmation of Endotracheal Intubation By Expert and Novice Emergency Physicians. West J Emerg Med. 2014;15(7):834-9. PubMed PMID: 25493129.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Accuracy of a novel ultrasound technique for confirmation of endotracheal intubation by expert and novice emergency physicians. AU - Gottlieb,Michael, AU - Bailitz,John M, AU - Christian,Errick, AU - Russell,Frances M, AU - Ehrman,Robert R, AU - Khishfe,Basem, AU - Kogan,Alexander, AU - Ross,Christopher, Y1 - 2014/11/24/ PY - 2014/05/09/received PY - 2014/08/07/revised PY - 2014/09/08/accepted PY - 2014/12/11/entrez PY - 2014/12/11/pubmed PY - 2015/8/19/medline SP - 834 EP - 9 JF - The western journal of emergency medicine JO - West J Emerg Med VL - 15 IS - 7 N2 - INTRODUCTION: Recent research has investigated the use of ultrasound (US) for confirming endotracheal tube (ETT) placement with varying techniques, accuracies, and challenges. Our objective was to evaluate the accuracy of a novel, simplified, four-step (4S) technique. METHODS: We conducted a blinded, randomized trial of the 4S technique utilizing an adult human cadaver model. ETT placement was randomized to tracheal or esophageal location. Three US experts and 45 emergency medicine residents (EMR) performed a total of 150 scans. The primary outcome was the overall sensitivity and specificity of both experts and EMRs to detect location of ETT placement. Secondary outcomes included a priori subgroup comparison of experts and EMRs for thin and obese cadavers, time to detection, and level of operator confidence. RESULTS: Experts had a sensitivity of 100% (95% CI = 72% to 100%) and specificity of 100% (95% CI = 77% to 100%) on thin, and a sensitivity of 93% (95% CI = 66% to 100%) and specificity of 100% (95% CI = 75% to 100%) on obese cadavers. EMRs had a sensitivity of 91% (95% CI = 69% to 98%) and of specificity 96% (95% CI = 76% to 100%) on thin, and a sensitivity of 100% (95% CI = 82% to 100%) specificity of 48% (95% CI = 27% to 69%) on obese cadavers. The overall mean time to detection was 17 seconds (95% CI = 13 seconds to 20 seconds, range: 2 to 63 seconds) for US experts and 29 seconds (95% CI = 25 seconds to 33 seconds; range: 6 to 120 seconds) for EMRs. There was a statistically significant decrease in the specificity of this technique on obese cadavers when comparing the EMRs and experts, as well as an increased overall time to detection among the EMRs. CONCLUSION: The simplified 4S technique was accurate and rapid for US experts. Among novices, the 4S technique was accurate in thin, but appears less accurate in obese cadavers. Further studies will determine optimal teaching time and accuracy in emergency department patients. SN - 1936-9018 UR - https://www.unboundmedicine.com/medline/citation/25493129/Accuracy_of_a_novel_ultrasound_technique_for_confirmation_of_endotracheal_intubation_by_expert_and_novice_emergency_physicians_ L2 - http://escholarship.org/uc/item/4v07265p DB - PRIME DP - Unbound Medicine ER -