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Concealed re-entry in the human heart
Insights
Concealed re-entry, a hidden cardiac impulse pathway, was studied in 49 patients. New patterns of concealed re-entry causing Wenckebach periodicity were identified, explaining complex heart rhythm disorders.
Area of Science:
- Cardiology
- Electrophysiology
Background:
- Concealed re-entry is an electrophysiologic event involving cardiac impulse pathways that are not directly detectable on the surface electrocardiogram.
- Understanding concealed re-entry is crucial for diagnosing and managing various cardiac arrhythmias.
Purpose of the Study:
- To investigate the mechanisms and electrophysiologic manifestations of concealed re-entry in human subjects.
- To document previously undescribed patterns of concealed re-entry and their role in cardiac impulse formation and conduction.
Main Methods:
- Analysis of human electrocardiograms (ECG) and intracardiac recordings from 49 patients.
- Identification of previously described and novel patterns of concealed re-entry.
- Evaluation of the impact of concealed re-entry on Wenckebach periodicity and supraventricular impulse conduction.
Main Results:
- Previously described patterns of concealed re-entry were confirmed in 49 patients.
- Novel manifestations of concealed re-entry were identified in seven patients, contributing to Wenckebach periodicity and "reversed" Wenckebach periods.
- Complete circus movement of supraventricular impulses was detected in five cases using intracardiac recordings and echo beat analysis.
Conclusions:
- Concealed re-entry is a significant electrophysiologic event with diverse manifestations in the human heart.
- This study identified new roles for concealed re-entry in the genesis of specific Wenckebach phenomena.
- Intracardiac recordings and detailed analysis are essential for detecting and understanding concealed re-entry and its clinical implications.
Abstract:
The mechanism and electrophysiologic manifestations of concealed re-entry were studied in human electrocardiograms and intracardiac recordings. Previously described patterns of concealed re-entry were documented in 49 patients. In seven cases concealed re-entry was involved in the genesis of Wenckebach periodicity and alternating Wenckebach periodicity in the AV node, and "reversed" Wenckebach periods in the His-Purkinje system. These manifestations of concealed re-entry were not described so far. In five cases re-entry was apparently concealed. Complete (but hidden) circus movement of the supraventricular impulses in these patients were detected by intracardiac recordings and by analysing the effects of echo beats on timing of the subsequent sinus beats. Concealed re-entry of the cardiac impulse is a well-documented electrophysiologic event which explains many common and peculiar manifestations of impulse formation and impulse conduction in the human heart.