contractilityheart blockbradycardiatachycardiadigitoxinchronotropyinotropic agentsrepolarizationdepolarisationpacemakersa nodeatrial fibrillationheart disordersfunctions of the heartstructures of the heartlimb leadschest leadsechocardiogramelectrocardiogramheart
contractilityheart blockbradycardiatachycardiadigitoxinchronotropyinotropic agentsrepolarizationdepolarisationpacemakersa nodeatrial fibrillationheart disordersfunctions of the heartstructures of the heartlimb leadschest leadsechocardiogramelectrocardiogramheart