QRS amplitude changes during heart filling and digitalization.
D000818:Animals; D006332:Cardiomegaly / Q000503:physiopathology*; D002415:Cats; D004077:Digoxin / Q000494:pharmacology*; D004562:Electrocardiography; D006321:Heart / Q000503:physiopathology*; D006329:Heart Conduction System / Q000187:drug effects; D006333:Heart Failure / Q000503:physiopathology*; D006801:Humans; D012965:Sodium Chloride / Q000494:pharmacology
D012965:Sodium Chloride; D004077:Digoxin