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Parahisian pacing: technique, utility, and pitfalls
Seth H Sheldon1, Hung-Kei Li, Samuel J Asirvatham
1Division of Cardiovascular Diseases, Department of Internal Medicine, Mayo Clinic College of Medicine, 200 First Street SW, Rochester, MN, 55905, USA.
Summary
Parahisian pacing is a valuable electrophysiology technique that helps differentiate accessory pathways from atrioventricular nodal conduction. This method aids in identifying various complex accessory pathway types and conduction patterns.
Area of Science:
- Electrophysiology
- Cardiology
- Cardiac Electrophysiology
Background:
- Identifying the mechanism of retrograde ventriculoatrial conduction is crucial in electrophysiology (EP) studies.
- Distinguishing between atrioventricular (AV) nodal pathways and accessory pathways is essential for patient management.
Purpose of the Study:
- To highlight the utility of parahisian pacing in the EP laboratory.
- To explain the nuanced interpretations of parahisian pacing for diagnosing various accessory pathway behaviors.
Main Methods:
- Parahisian pacing involves varying pacing output without changing catheter or electrode position or pacing cycle length.
- This technique is specifically designed to differentiate septal accessory pathways from AV nodal conduction.
Main Results:
- Parahisian pacing can reliably distinguish between AV nodal and accessory pathway conduction.
- The maneuver also aids in identifying free-wall accessory pathways, intermittently conducting pathways, and multiple accessory pathways.
Conclusions:
- Parahisian pacing is an important technique for diagnosing complex retrograde conduction patterns.
- Understanding uncommon findings during parahisian pacing enhances diagnostic accuracy in electrophysiology.
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