Anti-arrhythmic that exerts anti-fibrillatory efficacy via potential- & rate-dependent Nav1.5 (SCN5A) as well as atrial-selective Kv1.5 (KCNA5) blockade in vivo.
Vernakalant is a multiple ion channel blocker that exerts in vivo anti-fibrillatory (anti-arrhythmic) efficacy (ED50 = 1.5 μmol/kg/min iv. against ischemia-induced arrhythmias in rats) via atrial-selective Kv1.5 blockage (hKv1.5/rKv4.2/rKv4.3 IC50 = 13/38/30 μM at 1Hz & -80 to 60 mV in 200 (Kv1.5) or 400 (Kv4) msec) as well as potential- and rate-dependent Nav1.5 blockade (inward Na current INa IC50 = 9 μM/20 Hz & -80 mV, 31 μM/1Hz & -60 mV, 107 μM/1Hz & -120 mV using HEK hNav1.5 cells).
Journal of pharmacological sciences, 130(3), 170-176 (2016-04-02)
Electrical remodeling plays a pivotal role in maintaining the reentry during atrial fibrillation. In this study, we assessed influence of electrical remodeling on pharmacological manipulation of the atrial refractoriness in rabbits. We used an atrial electrical remodeling model of the
Journal of cardiovascular medicine (Hagerstown, Md.), 18(9), 663-668 (2017-07-12)
Current guidelines recommend vernakalant for pharmacologic cardioversion of recent-onset atrial fibrillation. However, this drug is not established as chronic therapy. In total, 15 rabbit hearts were Langendorff-perfused. A burst pacing protocol-induced atrial fibrillation in 7 of 15 hearts at baseline
Vernakalant inhibits several potassium currents and causes a rate- and voltage-dependent inhibition of the sodium current. The aim of this study was to evaluate the antiarrhythmic mechanism of vernakalant in normal and electrically remodeled atria. Fourteen goats were instrumented with
Circulation. Arrhythmia and electrophysiology, 10(10) (2017-10-12)
Evidence has emerged that small-conductance Ca2+-activated K+ (SK) channels constitute a new target for treatment of atrial fibrillation (AF). SK channels are predominantly expressed in the atria as compared with the ventricles. Various marketed antiarrhythmic drugs are limited by ventricular
Europace : European pacing, arrhythmias, and cardiac electrophysiology : journal of the working groups on cardiac pacing, arrhythmias, and cardiac cellular electrophysiology of the European Society of Cardiology, 19(5), 866-873 (2016-10-06)
The antiarrhythmic drug vernakalant exerts antiarrhythmic effects in atrial fibrillation. Recent experimental data suggest interactions with the late sodium current and antiarrhythmic effects in ventricular arrhythmias. We aimed at investigating whether treatment with vernakalant reduces polymorphic ventricular tachycardia (VT) in
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