Body Surface Potential Mapping during Ventricular Depolarization in Athletes with Prolonged PQ Interval after Exercise.

Autor:	Ivonina NI; Department of Comparative Cardiology - Komi Science Centre of the Ural Branch of the Russian Academy of Sciences, Syktyvkar - Federação Russa., Ivonin AG; Department of Comparative Cardiology - Komi Science Centre of the Ural Branch of the Russian Academy of Sciences, Syktyvkar - Federação Russa., Roshchevskaya IM; Department of Comparative Cardiology - Komi Science Centre of the Ural Branch of the Russian Academy of Sciences, Syktyvkar - Federação Russa.
Jazyk:	Portuguese; English
Zdroj:	Arquivos brasileiros de cardiologia [Arq Bras Cardiol] 2024 Mar 04; Vol. 121 (1), pp. e20230179. Date of Electronic Publication: 2024 Mar 04 (Print Publication: 2024).
DOI:	10.36660/abc.20230179
Abstrakt:	Background: Prolongation of the PQ interval, generally associated with an atrioventricular conduction delay, may be related to changes in intraventricular impulse spreading. Objective: To assess, using body surface potential mapping (BSPM), the process of ventricular depolarization in athletes with prolonged PQ intervals at rest and after exercise. Methods: The study included 7 cross-country skiers with a PQ interval of more than 200 ms (Prolonged-PQ group) and 7 with a PQ interval of less than 200 ms (Normal-PQ group). The BSPM from 64 unipolar torso leads was performed before (Pre-Ex) and after the bicycle exercise test (Post-Ex). Body surface equipotential maps were analyzed during ventricular depolarization. The significance level was 5%. Results: Compared to Normal-PQ athletes, the first and second periods of the stable position of cardiac potentials on the torso surface were longer, and the formation of the "saddle" potential distribution occurred later, at Pre-Ex, in Prolonged-PQ athletes. At Post-Ex, the Prolonged-PQ group showed a shortening of the first and second periods of stable potential distributions and a decrease in appearance time of the "saddle" phenomenon relative to Pre-Ex (to the values near to those of the Normal-PQ group). Additionally, at Post-Ex, the first inversion of potential distributions and the total duration of ventricular depolarization in Prolonged-PQ athletes decreased compared to Pre-Ex and with similar values in Normal-PQ athletes. Compared to Normal-PQ athletes, the second inversion was longer at Pre-Ex and Post-Ex in Prolonged-PQ athletes. Conclusion: Prolonged-PQ athletes had significant differences in the temporal characteristics of BSPM during ventricular depolarization both at rest and after exercise as compared to Normal-PQ athletes.
Databáze:	MEDLINE
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