Use of cardiac markers as assessed by outcomes analysis

Abstract

This article will describe the outcomes studies that have been performed or are needed in related to biochemical markers in coronary artery diseases (CAD). Studies in five major areas are reviewed: the need for emergency department (ED) chest pain centers and the role of cardiac markers; impact of cardiac marker testing frequency on length of stay (LOS); interpretation of cardiac troponins T and I for risk stratification of cardiac patients with unstable angina (UA); serum markers for determining the success of intravenous thrombolytic therapy following acute myocardial infarction (AMI), and its role in rescue percutaneous transluminal coronary angioplasty (PTCA); and need and criteria for implementation of new cardiac tests. Chest pain centers reduce unnecessary admissions and costs for AMI rule outs. Laboratories must perform testing on a stat basis for rapid rule out of AMI. Stat testing will also result in a reduction in hospital LOS for patients who rule in for AMI. For UA patients, studies are needed to determine how results of cardiac markers can be used to improve cardiac outcomes. Serial measurements of myoglobin offer the earliest discrimination for successful reperfusion, and should be used if rescue PTCA becomes important therapeutically. New markers for early diagnosis are needed to complement tests such as myoglobin and CK-MB isoforms. Markers that assess early pathophysiologic events of AMI such as inflammation, thrombosis, and pre-necrosis ischemia have the most promise.