Single Troponin Measurement to Rule Out Myocardial Infarction: JACC Review Topic of the Week

Area of Science:

• Cardiology
• Biomarker Analysis

Background:

• Acute myocardial infarction diagnosis relies on serial cardiac troponin measurements.
• High-sensitivity cardiac troponin (hs-cTn) assays offer improved diagnostic capabilities.
• The
• single-sample rule-out
• strategy aims to streamline diagnosis using hs-cTn.

Purpose of the Study:

• To evaluate the efficacy of the single-sample rule-out strategy for acute myocardial infarction.
• To determine the proportion of patients eligible for early triage using this method.
• To assess the impact of different hs-cTn thresholds on patient selection.

Main Methods:

• Analysis of observational and randomized studies investigating hs-cTn rule-out protocols.
• Comparison of different hs-cTn concentration thresholds (assay limit of detection vs. higher values).
• Evaluation of clinical sensitivity and negative predictive value for acute myocardial infarction exclusion.

Main Results:

• The single-sample rule-out strategy demonstrates high clinical sensitivity and negative predictive value for excluding acute myocardial infarction.
• Utilizing higher hs-cTn concentrations allows for the triage of a greater proportion of low-risk patients (at least 30%).
• The optimal hs-cTn threshold for rule-out varies by assay and regulatory considerations.

Conclusions:

• The single-sample rule-out strategy is a validated approach for excluding acute myocardial infarction in select patients.
• This strategy can significantly reduce unnecessary diagnostic procedures and hospital stays for low-risk individuals.
• Caution is advised in specific populations, including older patients, women, and those with cardiac comorbidities.