A comparison between frequency potentiation and postextrasystolic potentiation in vitro and in situ.
D000818:Animals; D005117:Cardiac Complexes, Premature / Q000503:physiopathology*; D005260:Female; D006168:Guinea Pigs; D006321:Heart / Q000503:physiopathology*; D006325:Heart Atria; D006439:Hemodynamics; D066298:In Vitro Techniques; D008297:Male; D009119:Muscle Contraction