Clinically contextualised ECG interpretation: the impact of prior clinical exposure and case vignettes on ECG diagnostic accuracy.

BACKGROUND: ECGs are often taught without clinical context. However, in the clinical setting, ECGs are rarely interpreted without knowing the clinical presentation. We aimed to determine whether ECG diagnostic accuracy was influenced by knowledge of the clinical context and/or prior clinical exposure to the ECG diagnosis. METHODS: Fourth- (junior) and sixth-year (senior) medical students, as well as medical residents were invited to complete two multiple-choice question (MCQ) tests and a survey. Test 1 comprised 25 ECGs without case vignettes. Test 2, completed immediately thereafter, comprised the same 25 ECGs and MCQs, but with case vignettes for each ECG. Subsequently, participants indicated in the survey when last, during prior clinical clerkships, they have seen each of the 25 conditions tested. Eligible participants completed both tests and survey. We estimated that a minimum sample size of 165 participants would provide 80% power to detect a mean difference of 7% in test scores, considering a type 1 error of 5%. RESULTS: This study comprised 176 participants (67 [38.1%] junior students, 55 [31.3%] senior students, 54 [30.7%] residents). Prior ECG exposure depended on their level of training, i.e., junior students were exposed to 52% of the conditions tested, senior students 63.4% and residents 96.9%. Overall, there was a marginal improvement in ECG diagnostic accuracy when the clinical context was known (Cohen's d = 0.35, p < 0.001). Gains in diagnostic accuracy were more pronounced amongst residents (Cohen's d = 0.59, p < 0.001), than senior (Cohen's d = 0.38, p < 0.001) or junior students (Cohen's d = 0.29, p < 0.001). All participants were more likely to make a correct ECG diagnosis if they reported having seen the condition during prior clinical training, whether they were provided with a case vignette (odds ratio [OR] 1.46, 95% confidence interval [CI] 1.24-1.71) or not (OR 1.58, 95% CI 1.35-1.84). CONCLUSION: ECG interpretation using clinical vignettes devoid of real patient experiences does not appear to have as great an impact on ECG diagnostic accuracy as prior clinical exposure. However, exposure to ECGs during clinical training is largely opportunistic and haphazard. ECG training should therefore not rely on experiential learning alone, but instead be supplemented by other formal methods of instruction.

Determining electrocardiography training priorities for medical students using a modified Delphi method.

BACKGROUND: Although electrocardiography is considered a core learning outcome for medical students, there is currently little curricular guidance for undergraduate ECG training. Owing to the absence of expert consensus on undergraduate ECG teaching, curricular content is subject to individual opinion. The aim of this modified Delphi study was to establish expert consensus amongst content and context experts on an ECG curriculum for medical students. METHODS: The Delphi technique, an established method of obtaining consensus, was used to develop an undergraduate ECG curriculum. Specialists involved in ECG teaching were invited to complete three rounds of online surveys. An undergraduate ECG curriculum was formulated from the topics of ECG instruction for which consensus (i.e. ≥75% agreement) was achieved. RESULTS: The panellists (n = 131) had a wide range of expertise (42.8% Internal Medicine, 22.9% Cardiology, 16% Family Medicine, 13.7% Emergency Medicine and 4.6% Health Professions Education). Topics that reached consensus to be included in the undergraduate ECG curriculum were classified under technical aspects of performing ECGs, basic ECG analysis, recognition of the normal ECG and abnormal rhythms and waveforms and using electrocardiography as part of a clinical diagnosis. This study emphasises that ECG teaching should be framed within the clinical context. Course conveners should not overload students with complex and voluminous content, but rather focus on commonly encountered and life-threatening conditions, where accurate diagnosis impacts on patient outcome. A list of 23 "must know" ECG diagnoses is therefore proposed. CONCLUSION: A multidisciplinary expert panel reached consensus on the ECG training priorities for medical students.

Effectiveness of blended learning versus lectures alone on ECG analysis and interpretation by medical students.

BACKGROUND: Most medical students lack confidence and are unable to accurately interpret ECGs. Thus, better methods of ECG instruction are being sought. Current literature indicates that the use of e-learning for ECG analysis and interpretation skills (ECG competence) is not superior to lecture-based teaching. We aimed to assess whether blended learning (lectures supplemented with the use of a web application) resulted in better acquisition and retention of ECG competence in medical students, compared to conventional teaching (lectures alone). METHODS: Two cohorts of fourth-year medical students were studied prospectively. The conventional teaching cohort (n = 67) attended 4 hours of interactive lectures, covering the basic principles of Electrocardiography, waveform abnormalities and arrhythmias. In addition to attending the same lectures, the blended learning cohort (n = 64) used a web application that facilitated deliberate practice of systematic ECG analysis and interpretation, with immediate feedback. All participants completed three tests: pre-intervention (assessing baseline ECG competence at start of clinical clerkship), immediate post-intervention (assessing acquisition of ECG competence at end of six-week clinical clerkship) and delayed post-intervention (assessing retention of ECG competence 6 months after clinical clerkship, without any further ECG training). Diagnostic accuracy and uncertainty were assessed in each test. RESULTS: The pre-intervention test scores were similar for blended learning and conventional teaching cohorts (mean 31.02 ± 13.19% versus 31.23 ± 11.52% respectively, p = 0.917). While all students demonstrated meaningful improvement in ECG competence after teaching, blended learning was associated with significantly better scores, compared to conventional teaching, in immediate (75.27 ± 16.22% vs 50.27 ± 17.10%, p <  0.001; Cohen's d = 1.58), and delayed post-intervention tests (57.70 ± 18.54% vs 37.63 ± 16.35%, p <  0.001; Cohen's d = 1.25). Although diagnostic uncertainty decreased after ECG training in both cohorts, blended learning was associated with better confidence in ECG analysis and interpretation. CONCLUSION: Blended learning achieved significantly better levels of ECG competence and confidence amongst medical students than conventional ECG teaching did. Although medical students underwent significant attrition of ECG competence without ongoing training, blended learning also resulted in better retention of ECG competence than conventional teaching. Web applications encouraging a stepwise approach to ECG analysis and enabling deliberate practice with feedback may, therefore, be a useful adjunct to lectures for teaching Electrocardiography.

Pre-University education curriculum reform and the generic learning skills of medical school entrants: Lessons learned from South Africa.

Background: Pre-university education curriculum changes may increase the skills and knowledge gap between secondary (high school) and tertiary (university) education that have been identified as having a major impact on the success of students from underresourced educational backgrounds. This study investigated the impact of extensive pre-university curriculum revision on the generic learning skills of entrants to South African medical schools, which admit students directly from high school. Methods: In this prospective study, students entering four medical schools during 2008-2011 were surveyed to determine their practice of and confidence in information handling, managing own learning, technical and numeracy skills, and computer, organizational, and presentation skills in the 12-month preceding entry. The 2008 entrants were the final cohort of the old secondary school curriculum. The mean levels of practice or confidence of entrants to the four medical schools, during 2008-2011, were compared using analysis of variance. The Bonferroni's test was used for further pair-wise comparison of cohorts of students either entering in different years or different institutions. Results: While entrants at the four medical schools did not demonstrate a consistent or sustained change in their practice of or confidence in each skill category over the period of study, there were some significant differences between entrants at the respective institutions. Furthermore, entrants to one medical school were consistently less confident of their skills, despite more practice. These findings are best accounted for by the long-standing history of inequitably resourced pre-university education in South Africa. Discussion: These findings highlight the need for close monitoring of the impact of pre-university education changes on the learning skill profiles of university entrants, in order to design effective university programs which enable students from diverse backgrounds to participate and adequately meet curricula demands.

Utility of mobile learning in Electrocardiography.

Aims: Mobile learning is attributed to the acquisition of knowledge derived from accessing information on a mobile device. Although increasingly implemented in medical education, research on its utility in Electrocardiography remains sparse. In this study, we explored the effect of mobile learning on the accuracy of electrocardiogram (ECG) analysis and interpretation. Methods and results: The study comprised 181 participants (77 fourth- and 69 sixth-year medical students, and 35 residents). Participants were randomized to analyse ECGs with a mobile learning strategy [either searching the Internet or using an ECG reference application (app)] or not. For each ECG, they provided their initial diagnosis, key supporting features, and final diagnosis consecutively. Two weeks later, they analysed the same ECGs, without access to any mobile device. ECG interpretation was more accurate when participants used the ECG app (56%), as compared to searching the Internet (50.3%) or neither (43.5%, P = 0.001). Importantly, mobile learning supported participants in revising their initial incorrect ECG diagnosis (ECG app 18.7%, Internet search 13.6%, no mobile device 8.4%, P < 0.001). However, whilst this was true for students, there was no significant difference amongst residents. Internet searches were only useful if participants identified the correct ECG features. The app was beneficial when participants searched by ECG features, but not by diagnosis. Using the ECG reference app required less time than searching the Internet (7:44 ± 4:13 vs. 9:14 ± 4:34, P < 0.001). Mobile learning gains were not sustained after 2 weeks. Conclusion: Whilst mobile learning contributes to increased ECG diagnostic accuracy, the benefits were not sustained over time.

Does multidisciplinary stroke care improve outcome in a secondary-level hospital in South Africa?

BACKGROUND AND PURPOSE: The improved outcome (survival and function) of stroke patients admitted to multidisciplinary stroke units (SU) in developed countries has not been replicated in developing countries in sub-Saharan Africa. This study documents the outcome of patients admitted to the first multidisciplinary SU opened at a secondary hospital in Cape Town, South Africa. METHODS: Patient outcomes including in-hospital mortality, resource utilization (length of hospital stay, CT brain scans performed, and tertiary hospital referral), and access to inpatient rehabilitation were recorded for all patients admitted to the hospital for 3 months before initiating multidisciplinary stroke care and for 3 months after implementing multidisciplinary stroke care. RESULTS: One hundred and ninety-five patients were studied; 101 of these were managed in the SU. Inpatient mortality decreased from 33% to 16% after initiating multidisciplinary stroke care (P=0.005). The length of hospital stay increased from a mean (SD, 95% CI) of 5.1 (6.5, 3.8-6.4) days to 6.8 (4.5, 5.9-7.6) days (P=0.01). Referral to inpatient rehabilitation increased from 5% to 19% (P=0.04) for those who survived to discharge. The number of CT brain scans performed and the number of referrals to the tertiary academic hospital did not increase significantly. CONCLUSIONS: Multidisciplinary stroke care was successfully implemented in a resource-constrained secondary-level hospital in South Africa and despite the limitations of the study, the significant reduction in inpatient mortality and increase in referral for inpatient rehabilitation would suggest an improvement in stroke care. Resource utilization in terms of length of hospital stay increased by a mean of 2 days but the number of CT brain scans performed and referral to a tertiary hospital did not increase significantly.