Fig. 2
a Right atrial and upper ventricular septum of a perfused rabbit heart. CSO coronary sinus ostium, KT Koch’s triangle, PB penetrating bundle, TV tricuspid valve. b 64-channel Intellamap Orion basket catheter (Boston Scientific, Marlborough, MA), which was placed in the LV endocardium. c 8 × 8 MappingLab electrode array placed over the region of HB