Fig. 2From: Bipolar radiofrequency catheter ablation for refractory perimitral flutter: a case reportBipolar ablation of mitral isthmus. a Anterior–posterior fluoroscopic image of the catheter position. Ablation (Abl), return electrode (Ret) and lasso catheter is positioned at the LA endocardium, within the CS and at the left atrial appendage (LAA) respectively. b Electrograms at the successful bipolar ablation site. c Termination of the flutter by bipolar ablationBack to article page