(A) Sinoatrial node was identified by mapping the earliest activation site and epicardially via right atrial tenting. (B) It was marked with a blue marker. (C) The SVC was isolated using the clamp. (D) Lesions anchoring the venae cavae were made with the ablation probe. (E) Small bites from SVC to mid-RA with the clamp ablated the crista terminalis. (F) Two mid-crista lesions were made with the clamp. RA: right atrium; SVC: superior vena cava.