Body Surface Potential Mapping during Ventricular Depolarization in Athletes with Prolonged PQ Interval after
Natalya I Ivonina1, Alexey G Ivonin1, Irina M Roshchevskaya1
1Department of Comparative Cardiology - Komi Science Centre of the Ural Branch of the Russian Academy of Sciences, Syktyvkar - Federação Russa.
Arquivos Brasileiros De Cardiologia
|March 7, 2024
Summary
Athletes with prolonged PQ intervals show distinct ventricular depolarization patterns on body surface potential mapping (BSPM). Exercise normalizes some of these differences, suggesting altered intraventricular conduction in these athletes.
Area of Science:
- Cardiology
- Electrophysiology
- Sports Medicine
Background:
- Prolonged PQ interval indicates atrioventricular conduction delay.
- This delay may be linked to intraventricular impulse spreading abnormalities.
Purpose of the Study:
- To evaluate ventricular depolarization using body surface potential mapping (BSPM).
- To compare athletes with prolonged PQ intervals versus normal PQ intervals at rest and after exercise.
Main Methods:
- Inclusion of 7 cross-country skiers with prolonged PQ intervals (>200 ms) and 7 with normal PQ intervals (<200 ms).
- Body surface potential mapping (BSPM) with 64 unipolar torso leads performed before and after exercise.
- Analysis of body surface equipotential maps during ventricular depolarization.
Main Results:
- Prolonged-PQ athletes exhibited delayed cardiac potential stabilization and later "saddle" potential formation at rest.
- Post-exercise, Prolonged-PQ athletes showed shortened stabilization periods and earlier "saddle" phenomenon, approaching Normal-PQ values.
- Ventricular depolarization duration and first inversion decreased post-exercise in Prolonged-PQ athletes, matching Normal-PQ values, while the second inversion remained longer.
Conclusions:
- Significant temporal differences in ventricular depolarization exist between Prolonged-PQ and Normal-PQ athletes.
- These differences, assessed by BSPM, are present both at rest and after exercise.
- Exercise influences the temporal characteristics of ventricular depolarization in athletes with prolonged PQ intervals.
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