New-onset left bundle branch block in patients with idiopathic dilated cardiomyopathy was a strong independent predictor of all-cause mortality (HR 3.18; 95% CI 1.90-5.31; P<0.001).
Cohort (n=608)
Does new-onset LBBB predict all-cause mortality in patients with idiopathic dilated cardiomyopathy?
New-onset LBBB is a strong, independent predictor of long-term mortality in patients with idiopathic dilated cardiomyopathy, suggesting a need for aggressive management such as early CRT/ICD therapy.
Effect estimate: HR 3.18 (95% CI 1.90-5.31)
Absolute Event Rate: 49% vs 25%
p-value: p=<0.001
AIMS: Left bundle branch block (LBBB) is commonly associated with heart failure. We evaluated the prevalence, incidence, and impact of LBBB on long-term outcome in young patients with heart failure affected by idiopathic dilated cardiomyopathy (DCM). METHODS AND RESULTS: We included 608 patients with DCM from the Heart Muscle Disease Registry of Trieste in this retrospective analysis. At baseline electrocardiogram (ECG), 189 patients (31.1%) had LBBB. The patients with baseline LBBB had a significantly higher mortality rate than the patients without LBBB (38.6 vs. 27.9%, P = 0.002) at the univariate analysis. After a multiple covariate adjustment, the baseline LBBB was not associated with a significantly increased risk of death hazard ratio (HR) 1.27, 95% confidence interval (CI): 0.88-1.81, P = 0.2. Forty-seven (11.2%) patients without LBBB at baseline ECG developed LBBB during follow-up. Among these, the mortality rate was 49 vs. 25% in patients without new-onset LBBB (P = 0.001). New-onset LBBB was a strong and independent predictor of all-cause mortality (HR 3.18, 95% CI: 1.90-5.31, P < 0.001) at multivariate analysis. CONCLUSION: After correcting for potential confounders, new-onset LBBB was found to be associated with an increased risk of all-cause mortality. The management of patients with new-onset LBBB may need to be more aggressive, possibly including early cardiac resynchronization therapy/implantable cardioverter-defibrillator therapy.
Aleksova et al. (Tue,) conducted a cohort in Idiopathic dilated cardiomyopathy (DCM) with heart failure (n=608). New-onset left bundle branch block (LBBB) vs. No new-onset LBBB was evaluated on All-cause mortality (HR 3.18, 95% CI 1.90-5.31, p=<0.001). New-onset left bundle branch block in patients with idiopathic dilated cardiomyopathy was a strong independent predictor of all-cause mortality (HR 3.18; 95% CI 1.90-5.31; P<0.001).