Publication date: Available online 10 January 2017
Source:Clinical Biochemistry
Author(s): Simon A. Mahler, Jason P. Stopyra, Fred S. Apple, Robert F. Riley, Gregory B. Russell, Brian C. Hiestand, James W. Hoekstra, Cedric W. Lefebvre, Bret A. Nicks, David M. Cline, Kim L. Askew, David M. Herrington, Gregory L. Burke, Chadwick D. Miller
ObjectivesThe HEART Pathway combines a decision aid and serial contemporary cardiac troponin I (cTnI) measures to achieve >99% sensitivity for major adverse cardiac events (MACE) at 30days and early discharge rates >20%. However, the impact of integrating high-sensitivity troponin (hs-cTn) measures into the HEART Pathway has yet to be determined. In this analysis we compare test characteristics of the HEART Pathway using hs-cTnI, hs-cTnT, or cTnI.Design & methodsA secondary analysis of participants enrolled in the HEART Pathway RCT was conducted. Each patient was risk stratified by the cTn-HEART Pathway (Siemens TnI-Ultra at 0- and 3-h) and a hs-cTn-HEART Pathway using hs-cTnI (Abbott) or hs-cTnT (Roche) at 3-h. The early discharge rate, sensitivity, specificity, and negative predictive value (NPV) for MACE (death, myocardial infarction, or coronary revascularization) at 30days were calculated.Resultshs-cTnI measures were available on 133 patients. MACE occurred in 11/133 (8%) of these patients. Test characteristics for the HEART Pathway using serial cTnI vs 3hour hs-cTnI were the same: sensitivity (100%, 95%CI: 72–100%), specificity (49%, 95%CI: 40–58%), NPV (100%, 95%CI: 94–100%), and early discharge rate (45%, 95%CI: 37–54%). The HEART Pathway using hs-cTnT missed one MACE event (myocardial infarction): sensitivity (91%, 95%CI: 59–100%), specificity (48%, 95%CI: 39–57%), NPV (98%, 95%CI: 91–100%), and early discharge rate (45%, 95%CI: 37–54%).ConclusionsThere was no difference in the test characteristics of the HEART Pathway whether using cTnI or hs-cTnI, with both achieving 100% sensitivity and NPV. Use of hs-cTnT with the HEART Pathway was associated with one missed MACE.
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