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Quantitative Assessment of the Recovery Property of Atriofascicular/Atrioventricular‐Type Mahaim Fiber
Author(s) -
LEE PICHANG,
KANTER RONALD,
GOMEZMARIN ORLANDO,
WOLFF GRACE S.,
YOUNG MINGLON
Publication year - 2002
Publication title -
journal of cardiovascular electrophysiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.193
H-Index - 138
eISSN - 1540-8167
pISSN - 1045-3873
DOI - 10.1046/j.1540-8167.2002.00535.x
Subject(s) - medicine , fiber , node (physics) , cardiology , coupling (piping) , line (geometry) , atrioventricular node , mathematics , tachycardia , geometry , mechanical engineering , chemistry , structural engineering , organic chemistry , engineering
Recovery Property of Mahaim Fiber.Introduction: One of the characteristics of the Mahaim fiber is that it possesses a decremental property related to the slow rate of recovery of its excitability similar to that of AV node. The aim of this study was to evaluate the recovery property of the atriofascicular/atrioventricular‐type Mahaim fiber and compare it with that of the AV node. Methods and Results: Nine patients with a Mahaim fiber were studied; 8 of the patients had atriofascicular/atrioventricular‐type fiber. Different models were used to analyze the relationship between conduction time for the Mahaim fiber and the corresponding coupling intervals. The simplest model with the best fit was found to be the linear regression of the natural log of conduction time on corrected coupling intervals. The individual R 2 values ranged between 0.43 and 0.98 for the Mahaim fiber and between 0.79 and 0.98 for AV node. The final model chosen for the log transformed data for the Mahaim fiber and for the AV node was the line with parameter estimates defined as a weighted average, over patients, of the corresponding individual line parameters. The weight used for each parameter was the inverse of its variance. The slopes of the lines of the transformed data were not significantly different between the Mahaim fiber and the AV node. Thus, the best fitting curve for the recovery property of the AF‐type Mahaim fiber is a simple exponential curve similar to that of the AV node. Conclusion: The atriofascicular/atrioventricular‐type Mahaim fiber has a quantitative recovery property very similar to that of the AV node.