Endothelin receptor--a blockade decreases ventricular arrhythmias after myocardial infarction in rats (Journal article)
Baltogiannis, G. G./ Tsalikakis, D. G./ Mitsi, A. C./ Hatzistergos, K. E./ Elaiopoulos, D./ Fotiadis, D. I./ Kyriakides, Z. S./ Kolettis, T. M.
OBJECTIVE: Endothelin-1 (ET-1) production increases during acute myocardial infarction (MI) and may contribute to the genesis of ventricular tachycardia (VT) and ventricular fibrillation (VF). However, the antiarrhythmic effects of ET-1 receptor blockade, examined shortly after MI, have been debated. In the present study, we examined the effects of such treatment on VT/VF during the first 24 h post-MI. METHODS: Thirty-five Wistar rats (223+/-22 g) were randomly allocated to either the ET-1 receptor-A (ETA) antagonist BQ-123 (0.4 mg/kg, BQ-123 group, n=17), or normal saline (control group, n=18) and were subjected to coronary artery ligation. A single-lead electrocardiogram was continuously recorded for 24 h post-MI, using an implanted telemetry system, and episodes of VT/VF were analyzed. Monophasic action potential (MAP) recordings were obtained from the left (LV) and right (RV) ventricular epicardium at baseline, 5 min after treatment and 24 h post-MI. RESULTS: There were 15.94+/-19.35 episodes/h/rat of VT/VF in the control group and 1.66+/-2.22 in the BQ-123 group (p=0.010), resulting in a lower (p=0.030) arrhythmic mortality in treated animals. The mean episode duration was 7.40+/-7.16 s for the control group and 2.30+/-1.37 s for the BQ-123 group (p=0.011). The maximum decrease in VT/VF was observed during the 1st, 5th and 6th hours post-MI. In the control group, LV MAP duration increased 24 h post-MI, displaying an increased beat-to-beat variation, but remained unchanged in the BQ-123 group. CONCLUSION: Acute ETA blockade reduces the incidence of VT/V F during the first 24-h post-MI in the rat, through a decrease in the dispersion of repolarization.
|Institution and School/Department of submitter:||Πανεπιστήμιο Ιωαννίνων. Σχολή Επιστημών Υγείας. Τμήμα Ιατρικής|
|Keywords:||Action Potentials/drug effects,Animals,Arrhythmias, Cardiac/*drug therapy/etiology/physiopathology,Electrocardiography, Ambulatory,Female,Myocardial Infarction/complications/*drug therapy/physiopathology,Peptides, Cyclic/*therapeutic use,Random Allocation,Rats,Rats, Wistar,Receptor, Endothelin A/*antagonists & inhibitors,Tachycardia, Ventricular/drug therapy/physiopathology,Telemetry/methods,Ventricular Fibrillation/drug therapy/physiopathology|
|Appears in Collections:||Άρθρα σε επιστημονικά περιοδικά ( Ανοικτά)|
Files in This Item:
|Baltogiannis-2005-Endothelin receptor-.pdf||245.54 kB||Adobe PDF||View/Open Request a copy|
Please use this identifier to cite or link to this item:This item is a favorite for 0 people.
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.