304 
SURGERY AND TRANSPLANTATION 
in 5, the craniovagal, caudovagal and recurrent 
cardiac nerve response each in one experiment. 
Ventricular Innervation 
Evaluation of ventricular sympathetic in- 
nervation reiterates previous studies which 
have demonstrated that these nerves enter 
the heart along the great vessels and through 
the VLCN which enters the heart at the left 
superior pulmonary vein (see DISCUSSION). 
Figure 6 demonstrates augmentation in con- 
tractility in RV sinus (RVS-F), the RV out- 
flow tract (RVO-F), the LV base (LVB) 
and the LV apex (LVA) during electrical stim- 
ulation of the left anterior ansa. These re- 
sponses continue to be observed after transec- 
tion of the entire atria, although rhythm shifts 
to AV junctional. However, following transec- 
tion of nerves along the pulmonary artery and 
aorta (column-PA and aorta), none of the re- 
sponses occur with neural stimulation. The 
sympathetic innervation to each of these areas 
of myocardium as well as to the AV node, there- 
LT. ANT. ANSA 
CONTROL ATRIA PA & AORTA 
LVB-F 
LVA-F 
BE(RV) 
W 
A. 
HR 171 
222 171 
200 166 
166 
Figure 6. — Regional Denervation of the Canine Heart. 
Lt. Anterior Ansa Stimulation 
RVS=rt. ventricular sinus contractile force 
BE (RA) = bipolar electrogram; rt. atrium 
RVO-F = rt. ventricular outflow tract contractile force 
RVmid-F = mid-portion rt. ventricle contractile force 
RA-Fr=rt. atrial contractile force 
LVB-F = lt. ventricular base contractile force 
LVA-F = It. ventricular apex contractile force 
BE (RV) =bipolar electrogram, rt. ventricle 
