Validation of a 0/2-Hour Point-Of-Care High Sensitivity Troponin Algorithm: A Multisite US Study

Area of Science:

• Cardiology
• Emergency Medicine
• Clinical Diagnostics

Background:

• Point-of-care (POC) testing offers rapid results in emergency settings.
• High-sensitivity troponin I (hs-cTnI) assays are crucial for diagnosing myocardial infarction (MI).
• An existing 0/2-hour algorithm developed in Australia requires validation in diverse U.S. populations.

Purpose of the Study:

• To validate and optimize the performance of the Australian 0/2-hour hs-cTnI algorithm in a multi-site U.S. Emergency Department (ED) cohort.
• To assess the diagnostic accuracy, specifically negative predictive value (NPV) and positive predictive value (PPV), of the algorithm.
• To enhance algorithm efficacy in classifying patients for rapid rule-out or rule-in of MI.

Main Methods:

• Prospective cohort study conducted across three U.S. EDs.
• Adult patients without STEMI undergoing hs-cTnI testing were enrolled.
• Simultaneous POC i-STAT 1 and central laboratory hs-cTnI measurements were performed; MI was adjudicated by experts.

Main Results:

• The original algorithm showed 54.8% efficacy with an NPV of 99.4% and PPV of 62.7%.
• An optimized algorithm increased efficacy to 60.0%, maintaining an NPV of 99.4% and improving PPV to 74.4%.
• The optimized algorithm effectively classified patients, aiding in the rapid assessment of index MI.

Conclusions:

• The original and optimized 0/2-hour algorithms for i-STAT POC hs-cTnI assays demonstrate high NPV and efficacy in U.S. ED settings.
• Algorithm optimization enhances diagnostic utility for MI assessment in emergency care.
• These findings support the use of the validated 0/2-hour algorithm for efficient POC troponin testing.