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A Research Method For Detecting Transient Myocardial Ischemia In Patients With Suspected Acute Coronary Syndrome Using Continuous ST-segment Analysis
18:11

A Research Method For Detecting Transient Myocardial Ischemia In Patients With Suspected Acute Coronary Syndrome Using Continuous ST-segment Analysis

Published on: December 28, 2012

Risk stratification in patients with unstable angina using absolute serial changes of 3 high-sensitive troponin

Tobias Reichlin1, Raphael Twerenbold, Claudia Maushart

  • 1Department of Cardiology, University Hospital Basel, Basel, Switzerland.

American Heart Journal
|March 5, 2013
PubMed

Insights

Most unstable angina (UA) patients show no significant high-sensitivity cardiac troponin (hs-cTn) changes. However, UA patients with hs-cTn changes face a worse prognosis, indicating potential myocardial necrosis.

Area of Science:

  • Cardiology
  • Biomarker Research
  • Emergency Medicine

Background:

  • Unstable angina (UA) diagnosis and its association with myocardial necrosis remain unclear.
  • High-sensitivity cardiac troponin (hs-cTn) assays are crucial for detecting myocardial injury.
  • This study investigates hs-cTn patterns in UA compared to acute myocardial infarction (AMI) and noncardiac chest pain (NCCP).

Purpose of the Study:

  • To determine if unstable angina (UA) is associated with previously undetected low-level myocardial necrosis.
  • To compare myocardial necrosis patterns in UA, AMI, and NCCP using three hs-cTn assays.
  • To assess the prognostic significance of hs-cTn changes in UA patients.

Main Methods:

  • A multicenter study enrolled 842 patients with acute chest pain.
  • Three hs-cTn assays (Roche hs-cTnT, Beckman Coulter hs-cTnI, Siemens hs-cTnI) were used.
  • hs-cTn levels were measured at presentation and at 1, 2, 3, and 6 hours; final diagnoses were adjudicated.

Main Results:

  • A ≥2 ng/L hs-cTn change within 1 hour was observed in 26-32% of UA patients, versus 91-96% in AMI and 12-23% in NCCP.
  • This hs-cTn change in UA was linked to increased 30-day and 2-year risks of death or recurrent AMI.
  • P-values indicate significant differences between UA and AMI, but not between UA and NCCP for hs-cTn changes.

Conclusions:

  • Most unstable angina (UA) patients do not exhibit significant high-sensitivity cardiac troponin (hs-cTn) level changes.
  • A minority of UA patients with hs-cTn changes experience significantly worse short- and long-term outcomes.
  • These findings suggest that hs-cTn changes in UA may indicate a higher risk of adverse events.
Abstract

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