Initial noninvasive testing strategies were associated with higher odds of cardiac catheterization and revascularization compared with no testing, without improving the 190-day MI rate of 0.33%.
Cohort (n=421,774)
Yes
Does initial noninvasive testing reduce the risk of acute myocardial infarction or affect downstream testing and interventions in emergency department patients with chest pain?
Deferral of early noninvasive testing appears reasonable in ED patients with chest pain, as initial testing increases downstream procedures without reducing the already very low risk of subsequent MI.
IMPORTANCE: Patients presenting to the emergency department (ED) with chest pain whose evaluation for ischemia demonstrates no abnormalities receive further functional or anatomical studies for coronary artery disease; however, comparative evidence for the various strategies is lacking and multiple testing options exist. OBJECTIVE: To compare chest pain evaluation pathways based on their association with downstream testing, interventions, and outcomes for patients in EDs. DESIGN, SETTING, AND PARTICIPANTS: Retrospective analysis of health insurance claims data for a national sample of privately insured patients from January 1 to December 31, 2011. Individuals with a primary or secondary diagnosis of chest pain in the ED were selected and classified into 1 of 5 testing strategies: no noninvasive testing, exercise electrocardiography, stress echocardiography, myocardial perfusion scintigraphy, or coronary computed tomography angiography. MAIN OUTCOMES AND MEASURES: The proportion of patients in each group who received a cardiac catheterization, coronary revascularization procedure, or future noninvasive test as well as those who were hospitalized for an acute myocardial infarction (MI) during 7 and 190 days of follow-up. RESULTS: In 2011, there were 693 212 ED visits with a primary or secondary diagnosis of chest pain, accounting for 9.2% of all ED encounters. After application of the inclusion and exclusion criteria, 421 774 patients were included in the final analysis; 293 788 individuals did not receive an initial noninvasive test and 127 986 did, representing 1.7% of all ED encounters. Overall, the percentage of patients hospitalized with an MI was very low during both 7 and 190 days of follow-up (0.11% and 0.33%, respectively). Patients who did not undergo initial noninvasive testing were no more likely to experience an MI than were those who did receive testing. Compared with no testing, exercise electrocardiography, myocardial perfusion scintigraphy, and coronary computed tomography angiography were associated with significantly higher odds of cardiac catheterization and revascularization procedures without a concomitant improvement in the odds of experiencing an MI. CONCLUSIONS AND RELEVANCE: Patients with chest pain evaluated in the ED who do not have an MI are at very low risk of experiencing an MI during short- and longer-term follow-up in a cohort of privately insured patients. This low risk does not appear to be affected by the initial testing strategy. Deferral of early noninvasive testing appears to be reasonable.
Foy et al. (Mon,) conducted a cohort in Chest pain (n=421,774). Noninvasive testing (exercise ECG, stress echocardiography, myocardial perfusion scintigraphy, or CCTA) vs. No noninvasive testing was evaluated on Cardiac catheterization, coronary revascularization procedure, future noninvasive test, or hospitalization for acute myocardial infarction. Initial noninvasive testing strategies were associated with higher odds of cardiac catheterization and revascularization compared with no testing, without improving the 190-day MI rate of 0.33%.