Use of High-Sensitivity Cardiac Troponin for the Exclusion of Inducible Myocardial Ischemia: A Cohort Study.

Abstract

Background:

Many patients with coronary artery disease (CAD) are routinely referred for surveillance stress testing despite recommendations against it.

Objective:

To determine whether low levels of resting high-sensitivity cardiac troponin I (hs-cTnI) can identify persons without inducible myocardial ischemia.

Design:

Observational study.

Setting:

A university-affiliated hospital network.

Patients:

Persons with stable CAD: 589 in the derivation group and 118 in the validation cohort.

Measurements:

Presence of inducible myocardial ischemia was determined by myocardial perfusion imaging with technetium-99m single-photon emission computed tomography during either treadmill or pharmacologic stress testing. Resting plasma hs-cTnI was measured within 1 week of the stress test, and the negative predictive value (NPV) for inducible ischemia was calculated. The derivation cohort was followed for 3 years for incident cardiovascular death and myocardial infarction.

Results:

In the derivation cohort, 10 of 101 patients with an hs-cTnI level below 2.5 pg/mL had inducible myocardial ischemia (NPV, 90% [95% CI, 83% to 95%]) and 3 of 101 had inducible ischemia involving at least 10% of the myocardium (NPV, 97% [CI, 92% to 99%]). In the validation cohort, 4 of 32 patients with an hs-cTnI level below 2.5 pg/mL had inducible ischemia (NPV, 88% [CI, 71% to 96%]) and 2 of 32 had ischemia of 10% or greater (NPV, 94% [CI, 79% to 99%]). After a median follow-up of 3 years in the derivation cohort, no adverse events occurred in patients with an hs-cTnI level below 2.5 pg/mL, compared with 33 (7%) cardiovascular deaths or incident myocardial infarctions among those with an hs-cTnI level of 2.5 pg/mL or greater.

Limitation:

The data may not be applicable to a population without known CAD or to persons with unstable angina, and the modest sample sizes warrant further validation in a larger cohort.

Conclusion:

Very low hs-cTnI levels may be useful in excluding inducible myocardial ischemia in patients with stable CAD.

Primary Funding Source:

National Institutes of Health.

• Authors: Muhammad Hammadah, Jeong Hwan Kim, Ayman Samman Tahhan, Bryan Kindya, Chang Liu, Yi-An Ko, Ibhar Al Mheid, Kobina Wilmot, Ronnie Ramadan, Ayman Alkhoder, Fahad Choudhary, Mohamad Mazen Gafeer, Naser Abdelhadi, Pratik Pimple, Pratik Sandesara, Bruno B Lima, Amit J Shah, Laura Ward, Michael Kutner, J Douglas Bremner, David S Sheps, Paolo Raggi, Laurence S Sperling, Viola Vaccarino, Arshed A Quyyumi
• Journal: Annals of internal medicine (Ann Intern Med) Vol. 169 Issue 11 Pg. 751-760 (12 04 2018) ISSN: 1539-3704 [Electronic] United States
• PMID: 30398528 (Publication Type: Journal Article, Observational Study, Research Support, N.I.H., Extramural)

Chemical References

• Biomarkers
• Radiopharmaceuticals
• Troponin I
• Technetium

Topics

• Aged
• Biomarkers (blood)
• Exercise Test
• Female
• Follow-Up Studies
• Humans
• Male
• Middle Aged
• Myocardial Ischemia (diagnosis, diagnostic imaging)
• Myocardial Perfusion Imaging
• Predictive Value of Tests
• Radiopharmaceuticals
• Technetium
• Tomography, Emission-Computed, Single-Photon
• Troponin I (blood)