Prognostic Implications of the Admission Cardiac Troponin I Levels and Door-to-Balloon Time on Clinical Outcomes in Patients with ST-Segment Elevation Myocardial Infarction Undergoing Percutaneous Coronary Intervention.

Background: The prognostic implications of the admission cTnI level and D2B time combined on in-hospital and 1-year heart failure (HF) and mortality in STEMI patients undergoing a primary percutaneous coronary intervention (PCI) are remain uncertain.

Methods and results: We divided the consecutive 1485 STEMI patients who underwent PCI from January 2015 to October 2019 at our hospital into three groups based on their admission cTnI levels: normal group (<0.1 ng/mL), middle group (0.1 to less than 3 ng/mL), and high group (≥3 ng/mL) and into two groups by their D2B times: >90 min (>90-D2B) and ≤90 min (≤90-D2B). During the in-hospital and 1-year follow-up periods, the incidence of composite clinical events increased significantly with the increase in the admission cTnI level (p < 0.05). In-hospital, the composite rate of death and HF events was significantly higher in the >90-D2B group compared to the ≤90-D2B group (p = 0.006), but its influence disappeared in the 1-year follow-up (p > 0.05). A multivariable logistic analysis revealed that, in the ≤90-D2B group, with the exception of the cTnI ≥3 ng/mL patients, the cTnI level had no effect on in-hospital or 1-year outcomes; in >90-D2B group, cTnI ≥3ng/mL increased outcomes in both periods.

Conclusion: High cTnI levels (≥3 ng/mL) on admission are independent of the D2B time for predicting in-hospital and 1-year cardiac events in STEMI patients undergoing PCI.