B Vojnar, A Holl, H C Dinges, T Keller, H Wulf, C Gaik
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引用次数: 0
Abstract
Aim: This cross-sectional study aimed to determine whether medical students with little to no ultrasound experience could correctly distinguish between 'pulsation present' and 'no pulsation present' after a short introductory video on the subject using ultrasound videos of the common carotid artery (CCA).
Methods: Ultrasound videos (B-mode, M-mode, and Color Doppler) of pulsatile (systolic blood pressure 70-80 mmHg) and non-pulsatile (cardiopulmonary bypass surgery, clamped aorta) CCA were created. These were demonstrated to the medical students for a period of ten seconds - corresponding to the duration of the manual pulse palpation during cardiopulmonary resuscitation (CPR). All participants viewed twenty of these videos in random order on a tablet and were asked to decide whether or not a CCA pulse was present.
Results: 432 participants completed the study in full on 20 cases, enabling a total of 8640 decisions on CCA pulse 'present' or 'not present' to be evaluated. M-mode: in 96 % (1244/1296) of the cases, the participants correctly identified the presence of pulsatile CCA. In the videos without pulsatile CCA, the correct decision 'no pulsation present' was made in 95 % (1231/1296) of the cases. B-mode: the decision 'pulsation present' was made correctly in 69 % (889/1296) of the cases, and in the remaining 31 % (407/1296) the option 'no pulsation present' was incorrectly chosen, although a video with CCA pulsation was shown. In contrast, the correct decision 'no pulsation present' was selected in 99 % of the cases (2142/2160). Color Doppler: CCA pulsation was correctly detected in 99.5 % (1290/1296) of the cases. In the videos without CCA pulsation, 99 % (1281/1296) of the videos were correctly evaluated as 'no pulsation present'.
Conclusion: Medical students seem to be able to detect the absence of a pulse with a high degree of accuracy using 2D ultrasound of the CCA in a controlled study setting, using different ultrasound modes. The results of this study suggest that a combination of Color Doppler and B-mode may be useful when evaluating the CCA during CPR to answer the question 'pulsation present' or 'no pulsation present'.
期刊介绍：
Resuscitation is a monthly international and interdisciplinary medical journal. The papers published deal with the aetiology, pathophysiology and prevention of cardiac arrest, resuscitation training, clinical resuscitation, and experimental resuscitation research, although papers relating to animal studies will be published only if they are of exceptional interest and related directly to clinical cardiopulmonary resuscitation. Papers relating to trauma are published occasionally but the majority of these concern traumatic cardiac arrest.
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