Repolarization in perfused myocardium predicts reperfusion ventricular tachyarrhythmias.

Repolarization in perfused myocardium predicts reperfusion ventricular tachyarrhythmias.

J Electrocardiol. 2017 Dec 06;:

Authors: Bernikova OG, Sedova KA, Arteyeva NV, Ovechkin AO, Kharin SN, Shmakov DN, Azarov JE

Abstract
BACKGROUND: Aim of the study was to find out which myocardial repolarization parameters predict reperfusion ventricular tachycardia and fibrillation (VT/VF) and determine how these parameters express in ECG.
METHODS: Coronary occlusion and reperfusion (30/30min) was induced in 24 cats. Local activation and end of repolarization times (RT) were measured in 88 intramyocardial leads. Computer simulations of precordial electrograms were performed.
RESULTS: Reperfusion VT/VF developed in 10 animals. Arrhythmia-susceptible animals had longer RTs in perfused areas [183(177;202) vs 154(140;170) ms in susceptible and resistant animals, respectively, P<0.05]. In logistic regression analysis, VT/VFs were associated with prolonged RTs in the perfused area (OR 1.068; 95% CI 1.012-1.128; P=0.017). Simulations demonstrated that prolonged repolarization in the perfused/border zone caused precordial terminal T-wave inversion.
CONCLUSIONS: The reperfusion VT/VFs were independently predicted by the longer RT in the perfused zone, which was reflected in the terminal negative phase of the electrocardiographic T-wave.

PMID: 29274899 [PubMed - as supplied by publisher]

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