Copyright © 2000 by the European Society of Cardiology.
Very early diagnosis and risk stratification of patients admitted with suspected acute myocardial infarction by the combined evaluation of a single serum value of cardiac troponin-T, myoglobin, and creatine kinase MBmass
a The Heart Center, H:S Rigshospitalet, Copenhagen University Hospital, Copenhagen, Denmark
b Division of Cardiology, Duke University, NC, U.S.A.
revised June 15, 1999; accepted June 16, 1999
Abstract
Aims The diagnostic and prognostic capacity of biochemical markers of acute myocardial infarction in the emergency department were evaluated in consecutive patients (n=155) with suspected acute myocardial infarction.
Methods and Results Serum myoglobin
110µg.l1and creatine kinase MBmass
5µg.l1had a high accuracy (0·770·85) (ns) for acute myocardial infarction diagnosis in patients presenting >2h after symptom onset. Troponin-T (
0·10µg.l1) had a lower accuracy (0·530·70) for acute myocardial infarction diagnosis, but was the most important 1-year prognostic marker (cardiac death or non-fatal acute myocardial infarction). In patients without ST elevation, combined analysis of two biochemical tests would accurately identify an additional 20% of acute myocardial infarction patients (predictive value of a positive test=0·82) and also identify those without acute myocardial infarction (predictive value of a negative test=0·80). One-year event-free survival was excellent (96%) for patients with two negative biochemical tests, intermediate (74%) for those with discordant tests, and only 53% for patients with two positive biochemical tests.
Conclusion Analysis of biochemical tests in the emergency department prior to hospital admission could accurately identify approximately 20% additional acute myocardial infarction patients. The prognosis of these patients is poor, and they may be a target for primary PTCA or new early initiated aggressive medical therapies.
Key Words: Myocardial infarction, diagnosis, prognosis, myoglobin, troponin-T, creatine kinase MBmass
f1 Correspondence: Birgit Jurlander, MD, PhD, Heart Center (B 2141), H:S Rigshospitalet, Copenhagen University Hospital, 9, Blegdamsvej, DK-2100 Copenhagen Ø, Denmark.
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