Intramyocardial conduction velocity being a factor determining the amplitude of the QRS complex of the electrocardiogram.
D000818:Animals; D001001:Anura; D002738:Chloroquine / Q000494:pharmacology; D004562:Electrocardiography; D006329:Heart Conduction System / Q000187:drug effects / Q000502:physiology*
D002738:Chloroquine