Affordable Access

Publisher Website

Hydralazine inhibits ventricular tachyarrhythmias in an acquired long QT rabbit model

Elsevier B.V.
DOI: 10.1016/j.joa.2013.06.002
  • Hydralazine
  • Ventricular Tachycardia
  • Early After Depolarization
  • Medicine


Abstract Background Some cardioactive vasodilating agents inhibit ventricular tachyarrhythmias (VT) associated with acquired long QT syndrome (LQT). We tested whether a vasodilator without direct cardiac effect can eliminate abnormal repolarization-related VT. Methods The effect of hydralazine on the occurrence of VT was assessed in a methoxamine-sensitized rabbit model of acquired LQT. To verify that VTs in this animal model are triggered by early afterdepolarization (EAD), monophasic action potential (MAP) on the left ventricular surface was recorded in open-chest rabbits. Results In control rabbits, combined administration of methoxamine and nifekalant frequently induced VTs (16/20, 80%). In contrast, VT occurred only in 2 out of 14 rabbits treated with hydralazine (14.3%, P<0.0001 vs. control). After the treatment, blood pressure was lower in the hydralazine group than in the control group (systolic pressure, 146±19 vs. 165±16mmHg, P<0.0001; diastolic pressure, 54±10 vs. 101±11mmHg, P<0.0001). EAD-like hump was less frequently detected in hydralazine-treated rabbits (2/10) than in saline-treated rabbits (9/10, P<0.005). Presence of a hump was significantly related to the appearance of VTs (P<0.05). Conclusion Hydralazine inhibited VT in a rabbit LQT model. Vasodilation may have a therapeutic effect on abnormal repolarization-related VT.

There are no comments yet on this publication. Be the first to share your thoughts.


Seen <100 times

More articles like this

Deep anesthesia suppresses ventricular tachyarrhyt...

on Circulation journal : official... 2011

Dexmedetomidine and clonidine inhibit ventricular...

on Circulation journal : official... 2012

Ventricular tachyarrhythmias complicating the idio...

on Journal of Electrocardiology January 1984

Ventricular tachyarrhythmias in the long QT syndro...

on The Medical clinics of North A... September 1984
More articles like this..