Classification of ventricular pre-excitation. Vectorcardiographic study

Area of Science:

• Cardiology
• Electrophysiology

Background:

• Ventricular pre-excitation, a condition where electrical impulses bypass normal pathways, is often classified using Rosenbaum's criteria.
• The current classification relies on specific electrocardiographic findings, but its basis and reliability are debated.

Purpose of the Study:

• To evaluate the validity and empirical nature of Rosenbaum's classification for ventricular pre-excitation.
• To investigate the relationship between pre-excitation patterns and associated cardiac conditions like bundle-branch block.

Main Methods:

• Analysis of 45 cases of ventricular pre-excitation, classifying them based on Rosenbaum's criteria.
• Recording and analysis of vectorcardiograms from 29 patients to assess delta and QRS vector characteristics.
• Review of existing literature on the association of pre-excitation and bundle-branch block.

Main Results:

• 19 cases classified as Type A, 20 as Type B, and 6 as intermediate.
• Vectorcardiograms revealed a continuous range of values, suggesting arbitrary quantitative data in classification.
• Associated right bundle-branch block was noted in three patients, with literature review failing to establish a rational basis for classification.

Conclusions:

• Rosenbaum's classification of ventricular pre-excitation is empirical and its validity is questioned.
• The continuous nature of electrophysiological findings challenges the distinct categories of the current classification system.
• Further research is needed to establish a more robust and rational basis for classifying ventricular pre-excitation.