Figure 1: Positive adenosine test
On administration of iv Adenosine, there is unmasking of antegrade pathway conduction indicating positive adenosine test (top panel). Return of preexcitation is transient and lasts only few seconds (bottom panel). From top to bottom, I, II and V2 represent leads I, II and V2 of 12 lead surface ECG. HRA represents distal bipole of right atrial catheter in right atrial appendage. His d represents distal bipole of quadripolar catheter in His bundle position. CS p represent proximal bipole of a decapolar catheter in coronary sinus.