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Updated: Feb 16, 2026

Induction and Assessment of Ischemia-reperfusion Injury in Langendorff-perfused Rat Hearts
Published on: July 27, 2015
Repolarization in perfused myocardium predicts reperfusion ventricular tachyarrhythmias
Olesya G Bernikova1, Ksenia A Sedova2, Natalia V Arteyeva3
1Laboratory of Cardiac Physiology, Institute of Physiology, Komi Science Center, Ural Branch, Russian Academy of Sciences, Pervomayskaya st., 50, Syktyvkar, Russia; Department of Therapy, Medical Institute of Pitirim Sorokin Syktyvkar State University, Oktyabrskiy pr., 55, Syktyvkar, Russia.
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.
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