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Accuracy of ECG Chest Electrode Placements by Paramedics; an observational study

By Pete Gregory, Stephen Lodge, Tim Kilner, Suzy Paget

Posted 03 Jul 2019
medRxiv DOI: 10.1101/19001321

BackgroundThe use of the 12-lead ECG is common in UK paramedic practice but its value depends upon accurate placement of the ECG-electrodes. Several studies have shown widespread variation in the placement of chest electrodes by other health professionals but no studies have addressed the accuracy of paramedics. The main objective of this study was to ascertain the accuracy of the chest lead placements by registered paramedics. MethodsRegistered paramedics who attended the Emergency Services Show in Birmingham in September 2018 were invited to participate in this observational study. Participants were asked to place the chest electrodes on a male model in accordance with their current practice. Correct positioning was determined against the Society for Cardiological Science & Technologys Clinical Guidelines for recording a standard 12-lead electrocardiogram (2017) with a tolerance of 19mm being deemed acceptable based upon previous studies. Results52 eligible participants completed the study. Measurement of electrode placement in the craniocaudal and mediolateral planes showed a high level of inaccuracy with 3/52 (5.8%) participants able to accurately place all chest leads. In leads V1 - V3, the majority of incorrect placements were related to vertical displacement with most participants able to identify the correct horizontal position. In V4, the tendency was to place the lead too low and to the left of the pre-determined position whilst V5 tended to be below the expected positioning but in the correct horizontal alignment. There was a less defined pattern of error in V6 although vertical displacement was more likely than horizontal displacement. ConclusionsOur study identified a high level of variation in the placement of chest ECG electrodes which could alter the morphology of the ECG. From a patient safety perspective, we would advocate that paramedics leave the chest electrodes in situ to allow hospital staff to assess the accuracy of the placements. Key messagesWhat is already known on this subject O_LIThe recording of a prehospital ECG has become increasingly common in sophisticated Emergency Medical Services across the world C_LIO_LIThe accuracy of precordial ECG electrode placement has been studied with other health professionals and has highlighted varying degrees of accuracy. C_LIO_LIInaccurate electrode placement can lead to aberrant ECG readings and application of unnecessary treatment or the withholding of indicated treatment C_LI What this study adds O_LIIn this observational cohort study, we found significant variation in the placement of the precordial ECG electrodes by UK registered paramedics C_LIO_LIWe recommend that paramedics leave the prehospital ECG electrodes in situ to allow hospital staff to assess the accuracy of the placements. C_LI

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