Keywords: جریان ورودی گذرا; AKAP; A-kinase anchor protein; Ang II; angiotensin II; AP; action potential; APD; action potential duration; BH4; tetrahydrobiopterin; cAMP; cyclic adenosine monophosphate; CaM; calmodulin; CaMKII; Ca/calmodulin-dependent protein kinase II; CaMKIIδC; cyt