Ridge-related reentry: A variant of perimitral atrial tachycardia

Seiji Takatsuki, Kotaro Fukumoto, Osamu Igawa, Takehiro Kimura, Nobuhiro Nishiyama, Yoshiyasu Aizawa, Yoko Tanimoto, Kojiro Tanimoto, Shunichiro Miyoshi, Keiichi Fukuda

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)


Ridge-Related Reentry Introduction The ridge between the left pulmonary veins (PV) and the left atrial appendage composes part of the lateral mitral isthmus (LMI). Following circumferential PV isolation and LMI linear ablation for the treatment of atrial fibrillation (AF), a critical pathway might develop over the ridge leading to a ridge-related reentry (RRR). Methods and Results Out of 61 patients who underwent circumferential PV isolation appended by LMI ablation, 5 patients developed RRR. The diagnosis of RRR was based on (1) macro-reentrant atrial tachycardia involving the septum, anterior and inferior wall of the left atrium; (2) slow conduction along the ridge; (3) wide-split double potentials in the ventricular aspect of the LMI were identified with the coronary sinus (CS) electrodes. RRR was investigated with electroanatomical mapping and entrainment mapping and catheter ablation was carried out in all patients. The mean cycle length (CL) of RRR was 312 ± 82 milliseconds and the PPIs at the left atrial septum, inferior and anterior wall during RRR were 10 ± 6, 12 ± 8, 9 ± 5 milliseconds longer than the RRR CL. The interval of the double potentials recorded in the CS electrodes crossing the LMI was 164 ± 38 milliseconds during RRR and the PPI on the LMI near the mitral annulus was 57 ± 10 milliseconds longer than the RRR CL. Catheter ablation was performed anatomically by targeting the ridge and successfully terminated RRR. Conclusion After circumferential PV isolation and ablation for LMI in patients with AF, RRR can develop by utilizing the surviving myocardial tissue of the ridge as a critical pathway.

Original languageEnglish
Pages (from-to)781-787
Number of pages7
JournalJournal of Cardiovascular Electrophysiology
Issue number7
Publication statusPublished - 2013 Jul


  • atrial fibrillation
  • catheter ablation
  • left atrial flutter
  • left atrial tachycardia
  • pulmonary vein isolation

ASJC Scopus subject areas

  • Cardiology and Cardiovascular Medicine
  • Physiology (medical)


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