the effective refractory period ( erp ) of the atrial myocardium , the atrial fibrillation threshold ( aft ) and the atrial fibrillation rate ( afr ) were measured repeatedly before and during the intravenous infusion of calcium at the rates of 0.025 , 0.050 and 0.100 mmol . kg-1 . min-1 in dogs whose heart was , in addition , submitted to a cholinergic influence .
C0027061
myocardium
C0018787
heart