Key result
Isoproterenol effects on action potential duration and triggered activity in dogs with inherited arrhythmias are primarily due to abnormal beta1-adrenoceptor mediated signaling.
Why the study?
Does beta-adrenergic receptor subtype modulation affect action potential duration and triggered activity in the ventricular myocardium of dogs with inherited lethal ventricular arrhythmias?
Population
Anteroseptal left ventricular myocardium from 11 German shepherd dogs with inherited lethal ventricular…
Comparison
Isoproterenol (10-10 M), beta-1 blocker… vs Myocardium from unafflicted control dogs…
Design
Preclinical
Authors
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Highlights beta1 dominance in canine inherited arrhythmia models; leaves open human translation of subtype-selective modulation.
Does beta-adrenergic receptor subtype modulation affect action potential duration and triggered activity in the ventricular myocardium of dogs with inherited lethal ventricular arrhythmias?
In a canine model of inherited ventricular arrhythmias, isoproterenol-induced triggered activity is primarily mediated by abnormal beta-1 adrenergic signaling and modulated by beta-2 receptors.
Eugene A. Sosunov (2000) studied Inherited lethal ventricular arrhythmias (n=18). Isoproterenol and beta-adrenergic receptor modulators vs. Unafflicted age-matched German shepherd controls was evaluated on Action potential duration (APD) to 90% repolarization and triggered activity. Isoproterenol effects on action potential duration and triggered activity in dogs with inherited arrhythmias are primarily due to abnormal beta1-adrenoceptor mediated signaling.