Ventricular Repolarization Pattern and Ischemic Arrhythmia Susceptibility at Different Follow-Ups of Diabetes Mellitus

Kód výsledku v IS VaVaI

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Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Ventricular Repolarization Pattern and Ischemic Arrhythmia Susceptibility at Different Follow-Ups of Diabetes Mellitus

Popis výsledku v původním jazyce

The ventricular distributions of activation-repolarization intervals (ARIs) were determined in control and diabetic (DM) rabbits (alloxan model, 1 and 2 months). In DM (1 month), the epicardial ARIs were prolonged heterogeneously, being longer on the right than on the left ventricle (LV) and on the LV apex than on the LV base. In DM (2 months), the ARIs lengthened ubiquitously. Coronary occlusion led to the repolarization shortening and repolarization dispersion increase in the control and DM (2 months) groups. However, the repolarization dispersion did not increase in the DM (1 month) rabbits since the ARIs shortened predominantly in the areas where they were prolonged in the preischemic conditions. The ventricular tachyarrhythmias were induced more frequently in the DM (2 months) group as compared to the DM (1 month), whereas the latter did not differ from the controls. The DM-related precordial T wave flattening was associated with the apicobasal repolarization gradient changes. Thus, the enhanced arrhythmogenicity in DM was associated with the pattern of the overall prolongation of repolarization observed at the 2 months but not 1 month follow-up, which predisposed to the increase of repolarization dispersion under myocardial ischemia.

Název v anglickém jazyce

Ventricular Repolarization Pattern and Ischemic Arrhythmia Susceptibility at Different Follow-Ups of Diabetes Mellitus

Popis výsledku anglicky

The ventricular distributions of activation-repolarization intervals (ARIs) were determined in control and diabetic (DM) rabbits (alloxan model, 1 and 2 months). In DM (1 month), the epicardial ARIs were prolonged heterogeneously, being longer on the right than on the left ventricle (LV) and on the LV apex than on the LV base. In DM (2 months), the ARIs lengthened ubiquitously. Coronary occlusion led to the repolarization shortening and repolarization dispersion increase in the control and DM (2 months) groups. However, the repolarization dispersion did not increase in the DM (1 month) rabbits since the ARIs shortened predominantly in the areas where they were prolonged in the preischemic conditions. The ventricular tachyarrhythmias were induced more frequently in the DM (2 months) group as compared to the DM (1 month), whereas the latter did not differ from the controls. The DM-related precordial T wave flattening was associated with the apicobasal repolarization gradient changes. Thus, the enhanced arrhythmogenicity in DM was associated with the pattern of the overall prolongation of repolarization observed at the 2 months but not 1 month follow-up, which predisposed to the increase of repolarization dispersion under myocardial ischemia.

Druh

O - Ostatní výsledky

CEP obor

ED - Fyziologie

OECD FORD obor

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Projekt

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Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2015

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů