cardiac action potential duration

Dofetilide (UK 68789) is a sulfonamide class III antiarrhythmic agent and potassium channel blocker. Dofetilide selectively blocks cardiac ion channels of the rapid component of the delayed rectifier potassium current Ikr. This antiarrhythmic agent prolongs cardiac action potential duration and effective refractory period due to delayed repolarization without affecting conduction velocity. This results in a normal sinus rhythm. Dofetilide is used in the treatment of atrial fibrillation and flutter.

1. Oxypeucedanin ((+-)-Oxypeucedanin) has novel anticancer effect, mediated via induction of G2-M cell cycle arrest and apoptosis in human prostate carcinoma DU145 cells. 2. Oxypeucedanin is a kind of open-channel blocker of the hKv1.5 channel and it prolongs the APD; therefore, it is an excellent candidate as an antiarrhythmic drug for atrial fibrillation.

Butoprozine exhibits various cardiac electrophysiological effects: it prolongs action potential duration, akin to the effect of amiodarone; it inhibits the plateau phase, similar to verapamil; and it reduces both amplitude and the maximum rate of depolarization.

Uridine triphosphate (UTP) is a purine nucleotide P2U receptor agonist with potential use in lung cancer treatment. By activating P2Y2 receptors, it enhances the proliferation of human cancerous ductal epithelial cells. Additionally, UTP induces fibrotic responses in cardiac fibroblasts through P2Y2 receptor activation and prolongs the action potential duration of guinea pig papillary muscles via the P2Y2 purinergic receptor.

BBR 2160 is a dihydropyridine derivative belonging to the group of the so-called tiampidine. BBR 2160 has calcium-antagonistic properties in cardiac tissue. Intracellular microelectrodes have been used to characterize the electrophysiological properties o

Carsatrin succinate is the salt form of Carsatin, a purinylpiperazine derivative used as a cardiotonic and antiarrhythmic. Carsatrin acts as positive inotropic agent that increases twitch tension and prolongs the action potential (AP) duration of ventricular muscle without affecting the Na+, K+-ATPase, adenylyl cyclase, phosphodiesterase isozymes, or cardiac myofilaments. Carsatrin's positive inotropic effect can be prevented by tetrodotoxin but not by the adrenergic antagonists timolol, yohimbine, or prazosin.

Carsatrin is purinylpiperazine derivative. as cardiotonic and antiarrhythmic. Carsatrin acts as positive inotropic agent that increases twitch tension and prolongs the action potential (AP) duration of ventricular muscle without affecting the Na+, K+-ATPase, adenylyl cyclase, phosphodiesterase isozymes, or cardiac myofilaments. Carsatrin's positive inotropic effect can be prevented by tetrodotoxin but not by the adrenergic antagonists timolol, yohimbine, or prazosin

E-4031 is a methanesulfonanilide class III antiarrhythmic agent that prolongs cardiac action potential duration by blocking ERG K+ channels (IC50 = 29 nM)