What is the clinical evidence from this study?

Study design: Review. Population: Abnormal conduction-induced cardiomyopathy. Intervention: Abnormal conduction (LBBB, RV pacing, pre-excitation).

What question did this study set out to answer?

The study aims to update the understanding of abnormal conduction-induced cardiomyopathy and its implications for diagnosis and treatment.

June 13, 2026Open Access

Abnormal Conduction-Induced Cardiomyopathy

Key Result

Abnormal conduction, such as left bundle branch block and pre-excitation, can induce reversible cardiomyopathies that improve with appropriate diagnosis and treatment.

Key Points

The study aims to update the understanding of abnormal conduction-induced cardiomyopathy and its implications for diagnosis and treatment.
Reviewed mechanisms, prevalence, incidence, and risk factors of abnormal conduction-induced cardiomyopathy.
Examined diagnosis approaches including cardiac imaging to identify ventricular dyssynchrony.
Highlighted management strategies for improving left ventricular ejection fraction (LVEF).
Abnormal conduction patterns identified via increased QRS duration indicate potential reversibility of cardiomyopathy.
Timely intervention can improve LVEF, functional class, and reduce overall morbidity and mortality.
Insights into LBBB and pre-excitation as treatable causes of cardiomyopathy were emphasized.

PICO

Population

Abnormal conduction-induced cardiomyopathy

Exposure / Comparator

Abnormal conduction (LBBB, RV pacing, pre-excitation)

Abstract

Nonischemic cardiomyopathies are a frequent occurrence. The understanding of the mechanism(s) and triggers of these cardiomyopathies have led to improvement and even recovery of LV function. While chronic right ventricular pacing-induced cardiomyopathy has been recognized for many years, left bundle branch block (LBBB) and pre-excitation have been recently identified as potential reversible causes of cardiomyopathy. These cardiomyopathies share a similar abnormal ventricular propagation that can be recognized by a wide QRS duration with LBBB pattern and thus we coin the term “abnormal conduction-induced cardiomyopathies”. Such abnormal propagation results in an abnormal contractility that can only be recognized by cardiac imaging as ventricular dyssynchrony. Appropriate diagnosis and treatment will not only lead to improved LVEF and functional class but may also reduce morbidity and mortality. This manuscript presents an update of the mechanisms, prevalence, incidence, risk factors, as well as their diagnosis and management, while highlighting current gaps of knowledge.

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