Cumulative effect of complete left bundle-branch block and chronic atrial fibrillation on 1-year mortality and...

Area of Science:

• Cardiology
• Electrophysiology
• Heart Failure Research

Background:

• Prognostic factors in congestive heart failure (CHF) are crucial for patient management.
• Complete left bundle-branch block (LBBB) and atrial fibrillation (AF) individually impair left ventricular function in CHF.
• The combined impact of LBBB and AF on CHF mortality remains under-investigated.

Purpose of the Study:

• To investigate the independent and cumulative effect of co-existing LBBB and AF on mortality in CHF patients.
• To determine if this combination of electrical disturbances identifies a specific high-risk CHF population.

Main Methods:

• Analysis of the Italian Network on Congestive Heart Failure (IN-CHF) Registry data.
• Inclusion of 5517 patients with one-year follow-up data.
• Statistical analysis of hazard ratios (HR) and confidence intervals (CI) for mortality and hospitalization.

Main Results:

• 185 patients (3.3%) had both LBBB and AF.
• This combination was associated with increased 1-year all-cause mortality (HR: 1.88) and sudden death (HR: 1.89).
• Increased 1-year hospitalization rates were also observed (HR: 1.83).

Conclusions:

• The concurrent presence of LBBB and AF significantly increases mortality in CHF patients.
• This synergistic effect on mortality persists after adjusting for other clinical variables.
• LBBB and AF together identify a CHF subgroup with a substantially elevated risk of death.