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Physician perception of exercise electrocardiography as a prognostic test after acute myocardial infarction
M Bobbio1, A Deorsola, G Pistis
1Cattedra di Cardiologia, Università di Torino, Italy.
Insights
Cardiologists accurately estimated patient prognosis after acute myocardial infarction (AMI). However, their risk assessments were less precise for high-risk cases, and management decisions poorly aligned with these risk evaluations.
Area of Science:
- Cardiology
- Clinical Medicine
- Diagnostic Testing
Background:
- Exercise electrocardiography is a key tool for assessing prognosis after acute myocardial infarction (AMI).
- Physician interpretation of diagnostic test results significantly impacts patient management and outcomes.
Purpose of the Study:
- To evaluate how cardiologists interpret exercise electrocardiography results for prognosis after AMI.
- To compare physician risk estimates with literature-derived data and Bayes' theorem calculations.
- To assess the correlation between risk assessment and subsequent clinical management decisions.
Main Methods:
- 29 board-certified cardiologists reviewed a case history of a 50-year-old man with uncomplicated AMI.
- Physicians estimated 1-year mortality risk, test sensitivity/specificity, and risk with positive/negative results.
- Bayes' theorem was used to calculate risks, which were compared to physician estimates.
Main Results:
- Physician risk estimates closely matched literature-derived data.
- Estimated risks were more accurate for negative test results than positive ones.
- Management decisions (e.g., coronary angiography) showed poor correlation with physician-estimated risks.
Conclusions:
- Cardiologists demonstrate accurate, albeit less precise for high-risk, prognostic estimation post-AMI using exercise ECG.
- A significant disconnect exists between risk assessment and clinical decision-making in post-AMI management.
- Further research may be needed to align diagnostic interpretation with optimal therapeutic strategies.
Abstract:
To determine how physicians interpret exercise electrocardiography with respect to prognosis after acute myocardial infarction (AMI), 29 cardiologists (all board certified) were presented a case history of a 50-year-old man with an uncomplicated AMI and asked to estimate the patient's risk of dying over the next year, the sensitivity and specificity of exercise electrocardiography with respect to 1-year mortality, and the patient's risk of dying given a positive and a negative test result. Each set of physician estimates did not differ from those derived from a review of the medical literature (difference not significant for each). Risk after the test was also calculated using the Bayes' theorem. Calculated versus estimated risks were compared after a negative (7 +/- 9 vs 11 +/- 11%) and a positive (27 +/- 22 vs 17 +/- 15%, differences not significant) test result. Estimated risks were more accurate for a negative result than for a positive one (89 +/- 10 vs 83 +/- 12%, p less than 0.001). Given a positive test result, 57% of the physicians recommended coronary angiography. However, their estimates of risk (30 +/- 23%) were not significantly different from the estimates of those physicians (14%) who recommended additional noninvasive testing (19 +/- 4%) or those (29%) who recommended medical therapy (28 +/- 26%) (difference not significant). Thus, cardiologists accurately estimated prognosis following AMI, but they were less accurate in assessing high risk than low risk, and their management decisions correlated poorly with their risk assessments.