# Right Bundle Branch Block and Rehospitalization in Patients With Heart Failure

## TL;DR

This study shows that right bundle branch block is linked to a higher risk of rehospitalization in heart failure patients.

## Contribution

It identifies pure right bundle branch block as an independent risk factor for heart failure rehospitalization.

## Key findings

- Pure RBBB was independently associated with heart failure rehospitalization.
- LBBB was also linked to a higher risk of rehospitalization.
- RBBB risk remained significant after adjusting for confounders.

## Abstract

Objective: The most important aspect of managing heart failure (HF) is preventing rehospitalization. Bundle branch block (BBB), particularly left BBB (LBBB), has been a known risk factor for worsening prognosis, whereas no such consideration has been made for right BBB (RBBB). However, recent research has shown that RBBB was associated with increased mortality. This study evaluated the effects of RBBB on prognosis, especially rehospitalization, in patients with HF.

Materials: This study included 698 patients admitted for HF. Those who died in the hospital (n = 31) and dropped out during observation (n = 143) were excluded. After one year of observation, the patients were divided into a control group (n = 361) and a major adverse cardiovascular event (MACE) group (n = 163). After further excluding according to electrocardiography findings, patients were categorized as having no BBB (n = 307), pure RBBB (n = 37), and LBBB (n = 56), and then the characteristics, clinical data, and prognosis of the remaining patients were evaluated.

Results: Patients were compared to no BBB, pure RBBB, and LBBB was associated with a risk for HF rehospitalization (p = 0.007). Furthermore, pure RBBB was independently associated with HF rehospitalization even after adjusting for confounders (hazard ratio: 2.40 (95% confidence interval: 1.26-4.58; p = 0.008).

Conclusion: Pure RBBB was independently associated with HF rehospitalization, highlighting the need for vigilance against the risk of HF rehospitalization among those with pure RBBB.