Clinical question: What is the diagnostic yield of performing routine stress testing in patients who have tested negative for acute coronary artery syndrome?
Bottom Line: Fewer than 1% of patients who present to the ER with acute chest pain and then undergo routine provocative cardiac testing after 2 sets of negative serum troponin results are likely to benefit from angioplasty (American Heart Association [AHA] class I or IIa). False-positive results will be common.(True positive rate 51.2%) (LOE = 2b)
Study Design: Cohort (retrospective)
Funding: Self-funded or unfunded
Setting: Emergency department
Synopsis: The AHA recommends provocative testing (eg, stress testing) in patients with acute chest pain who have negative biomarker results, with the idea that it will identify patients who may benefit from revascularization. The researchers conducting this study identified all patients (N = 4181) without previously identified coronary artery disease who presented to an emergency department over a 6-year period. All included patients had been ruled out for acute coronary syndrome and then had exercise stress testing (n = 512) or myocardial perfusion imaging (n = 3669) while still in the emergency department. Of these patients, 470 (11.2%) had inducible myocardial ischemia. Most were managed medically, but 26.2% of them were deemed to require coronary angiography to determine whether they had obstructive disease that would benefit from revascularization. Of this group, a total of 63 had obstructive disease, but only 28 patients had disease that would benefit from revascularization (AHA class I or IIa). As a result, the true positive rate was only 51.2% for patients undergoing provocative testing and subsequent angiography. Only 0.7% of patients who underwent provocative testing would have benefited from intervention, and an equal percentage had obstructive disease that would have been harmed by catheterization (eg, AHA class III).Allen F. Shaughnessy, PharmD, MMedEd
Professor of Family Medicine