to facilitate the conduct of similar studies in smaller experimental animals , a cardiologic model with the rat is introduced that permits determination of in vivo cardiac contractility ( e.g. , left intraventricular pressure , dp/dt ) and excitability ( e.g. , atrioventricular node conductivity , his-purkinje system conduction time ) with subsequent biochemical analysis of the same heart .
C0004247
atrioventricular node
C0018787
heart