 Three catheters were placed via the right femoral vein; 5-French catheters to the right ventricular apex and right atrial appendage; and a 6-French catheter to the His bundle. 
Three catheters were placed via the right femoral vein ; 5 - French catheters to the right ventricular apex and right atrial appendage ; and a 6 - French catheter to the His bundle .