Use of troponin T and creatine kinase-MB subunit levels for risk stratification of emergency department patients with possible myocardial ischemia

Annals of Emergency Medicine
G B GreenG D Kelen

Abstract

To evaluate and compare the utility of measurement of troponin T and the creatine kinase MB subunit (CK-MB) for risk stratification of ED patients with possible myocardial ischemia. Prospective observational study of ED patients with symptoms of possible myocardial ischemia with early, single sample serologic testing for cardiac troponin T and CK-MB using an identity-unlinked process. Chart review (ED, inpatient, outpatient), and telephone and mail surveys identified adverse events (AEs) during the 14 days following enrollment. AEs recorded included death, respiratory or cardiac arrest, myocardial infarction (MI), atrial and ventricular arrhythmias, pulmonary edema, conduction disturbances, and recurrent angina. Measures of the predictive ability for AEs were calculated for troponin T, CK-MB, and a combined troponin T/CK-MB index (defined as positive if either troponin T or CK-MB levels exceeded threshold values). Among 292 study patients, 45 (15.4%) experienced at least one AE, including seven deaths and 12 MIs. The troponin T result was positive in 34 patients, and the CK-MB result was positive in 15 patients; 6 patients had positive results for both markers and 43 patients had a positive combined troponin T/CK-MB index. Odds...Continue Reading

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