# Analysis of 4 Cases of Left Bundle Branch Block With Ventricular Preexcitation

## TL;DR

This paper describes four cases where ventricular preexcitation coexists with left bundle branch block, highlighting differences based on accessory pathway location.

## Contribution

The study provides new clinical insights into electrocardiographic patterns of WPW with LBBB based on real patient cases.

## Key findings

- Right-sided accessory pathways were observed in one case, while left-sided pathways were found in three cases.
- Electrocardiographic features varied depending on the location of the accessory pathway.
- Intermittent WPW was confirmed in all four cases.

## Abstract

This paper reports 4 cases of ventricular preexcitation (WPW) accompanied by left bundle branch block (LBBB). WPW appeared intermittently in all cases: Case 1 involved a right‐sided accessory pathway, while Cases 2–4 involved left‐sided accessory pathways. The electrocardiographic characteristics of both right‐sided and left‐sided accessory pathways coexisting with LBBB are discussed.