Key result
Exercise-induced ST elevation linked to ~140% higher risk of major cardiac events in NIDCM.
Why the study?
The clinical significance and prevalence of exercise-induced ST elevation in patients with non-ischemic dilated cardiomyopathy and narrow QRS complexes were unknown.
Does the presence of exercise-induced ST elevation predict major cardiac events in patients with non-ischemic dilated cardiomyopathy and narrow QRS complexes?
Cohort (n=360)
No
Does the presence of exercise-induced ST elevation predict major cardiac events in patients with non-ischemic dilated cardiomyopathy and narrow QRS complexes?
Exercise-induced ST elevation occurs in 14% of NIDCM patients with narrow QRS and serves as a strong independent predictor of death, transplantation, or LVAD implantation.
BACKGROUND: The clinical significance and prevalence of exercise-induced ST elevation (ESTE) in non-ischemic dilated cardiomyopathy (NIDCM) patients are unknown. METHODS AND RESULTS: We retrospectively examined 12-lead ECGs during cardiopulmonary exercise testing in 360 consecutive NIDCM patients (left ventricular ejection fraction (LVEF) <45%) with narrow QRS. ESTE was defined as ≥1.0mm ST (J-point) elevation compared with baseline. During long-term follow-up for major cardiac events (death, transplantation, or LV assist device implantation), ESTE was recognized in 50 patients (14%). They had much lower LVEF than patients without ESTE (20±7% vs. 27±7%, respectively, P<0.001), whereas the differences in peak VO2 (P=0.01) and VE/VCO2 slope (P=0.04) were relatively small. Major cardiac events occurred more frequently in patients with ESTE than in those without ESTE (39% vs. 12% at 48 months). Increased event rates were associated with low peak VO2 (<14ml·min(-1)·kg(-1)) in patients without ESTE (39% vs. 23%, P<0.05), but not in those with ESTE (50% vs. 62%, NS). Cox multivariate analysis revealed ESTE as the strongest independent prognosticator among exercise parameters (hazard ratio: 2.41 [95% confidence interval 1.03-5.63], P<0.05). CONCLUSIONS: A substantial number of NIDCM patients exhibit ESTE, which indicates a poor prognosis. Low peak VO2 and ESTE may reflect different aspects of the pathophysiological processes that deteriorate heart failure.
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Takahama et al. (2013) conducted a cohort in Non-ischemic dilated cardiomyopathy (n=360). Exercise-induced ST elevation (ESTE) vs. No exercise-induced ST elevation was evaluated on Major cardiac events (composite of cardiac death, heart transplantation, or LV assist device implantation) (HR 2.41, 95% CI 1.03-5.63, p=0.042). Exercise-induced ST elevation independently predicted major cardiac events in patients with non-ischemic dilated cardiomyopathy (HR 2.41).
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