[Relation between the surface ECG and the bundle of His electrogram in 200 patients]

Area of Science:

• Cardiology
• Electrophysiology
• Cardiac Conduction System

Context:

• Assessing the correlation between surface electrocardiogram (ECG) findings and His bundle electrograms.
• Evaluating 200 patients (130 men, 70 women) with various conduction disorders.
• Investigating cardiac conduction during spontaneous rhythm and atrial stimulation.

Purpose:

• To determine the diagnostic significance of His bundle electrography for prognostically unfavorable intra- and infraHisal conduction disorders.
• To identify specific surface ECG patterns indicative of His bundle pathology.
• To establish the utility of invasive electrophysiological testing in cases of syncope.

Summary:

• Specific surface ECG findings, including complete right bundle branch block with hemiblocks, complete left bundle branch block, and certain atrioventricular blocks, are associated with His bundle pathology.
• Electrophysiological study of the His bundle is vital for detecting intra- and infraHisal conduction abnormalities.
• Normal-appearing surface ECGs can mask significant His-Purkinje system damage, underscoring the need for invasive testing in specific clinical scenarios.

Impact:

• Highlights the limitations of surface ECG in diagnosing subtle His bundle conduction disorders.
• Emphasizes the prognostic value of His bundle electrography in identifying high-risk patients.
• Justifies the use of invasive electrophysiological testing for unexplained syncope, improving diagnostic accuracy and patient management.