Critical Isthmus Identification in Macro-Re-Entrant Atrial Tachycardia With Epicardial Conduction by Peak Frequency Mapping. - Kawafuji S; Yamaji H; Yamaoka R; Eda K; Shigyo K; Akiyama A; Kayama M; Sano M; Higashiya S; Kubo M; Murakami T; Kusachi S (JACC. Case reports, 2026)