Figure 6c. Percutaneous cryoablation in atrial fibrillation. (a) The cardiac catheter is inserted via the femoral vein and guided to the heart. (b) The catheter is inserted through the septum and into the left atrium. (c) The catheter enters the left upper pulmonary vein. (d) The cryoablation catheter is shown below the mapping Lasso catheter.