Incidence, predictive factors, and prognostic value of myocardial injury following uncomplicated transcatheter aortic valve implantation.

OBJECTIVES

This study sought to: 1) determine the incidence, degree, and timing of the rise in serum cardiac markers of myocardial injury associated with uncomplicated transcatheter aortic valve implantation (TAVI); and 2) evaluate the predictive factors and prognostic value of myocardial injury associated with TAVI.

BACKGROUND

Very few data exist on the occurrence and clinical relevance of myocardial injury during TAVI procedures.

METHODS

A total of 101 patients who underwent successful TAVI (transfemoral [TF] approach, n = 38; transapical [TA] approach, n = 63) were included. Creatine kinase-MB (CK-MB) and cardiac troponin T (cTnT) levels were determined at baseline and at 6 to 12, 24, 48, and 72 h following TAVI.

RESULTS

TAVI was associated with some degree of myocardial injury in 99% of the patients (TF: 97%, TA: 100%) as determined by a rise in cTnT (maximal value, 0.48 μg/l, interquartile range [IQR]: 0.24 to 0.82 μg/l) and in 77% of the patients (TF: 47%, TA: 95%) as determined by a rise in CK-MB (maximal value, 18.6 μg/l; IQR: 11.0 to 27.4 μg/l). TA approach and baseline renal dysfunction were associated with a higher increase in biomarkers of myocardial injury (p < 0.01 for both). A larger myocardial injury was associated with a smaller improvement of left ventricular ejection fraction (LVEF) (p < 0.01). The degree of rise in cTnT was an independent predictor of cardiac mortality at 9 ± 10 months of follow-up (hazard ratio: 1.14 per each increase of 0.1 μg/l, 95% confidence interval: 1.02 to 1.28, p = 0.028).

CONCLUSIONS

TAVI was systematically associated with some degree of myocardial injury, with TA approach and baseline renal dysfunction determining a higher increase in biomarkers of myocardial injury. A greater degree of myocardial injury was associated with less improvement in LVEF and a higher cardiac mortality at follow-up.