Single-loop incisional atrial tachycardia encircling the entire right atrium: Where is the critical isthmus?

Okada, Masato; Tanaka, Kõji; Tanaka, Nobuaki; Hirao, Yuko; Yoshimoto, Issei; Inoue, Koichi

doi:10.1016/j.hrcr.2020.12.003

Cited by 1 publication

(2 citation statements)

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“…In this study, we evaluated only 12 STA‐AT, so further types of AT circuits may exist. Complex STA‐AT circuits have been recently reported 15,16 . In those cases, lateral incision for tricuspid valve procedures modified septal scar related AT.…”

Section: Limitationsmentioning

confidence: 99%

“…Complex STA-AT circuits have been recently reported. 15,16 In those cases, lateral incision for tricuspid valve procedures modified septal scar related AT. Even in these complex circuits, evaluating activation in the region of the incision line and residual intra-right atrial conduction should lead to accurate identification of the circuit and help in selection of the optimal ablation site.…”

Section: Limitationsmentioning

confidence: 99%

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Treatment of atrial tachycardia arising after superior transseptal approach mitral valve surgery: Insights from ultra‐high‐density mapping to prevent atrioventricular block

Hara

Kusa

Miwa

et al. 2022

Pacing Clinical Electrophis

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Introduction Mitral valve surgery employing a superior transseptal approach (STA) is associated with arrhythmogenicity and intra‐atrial conduction delay, despite being optimal for visualization of the surgical field. It is sometimes difficult to treat atrial tachycardias (AT) that arise after STA. To investigate AT circuits that arise after STA in detail in order to identify the optimal ablation line, using ultra‐high‐resolution mapping (UHRM). Methods We retrospectively analyzed 12 AT from 10 patients (median age 70 years, nine males) who had undergone STA surgery. The tachycardias were mapped using the Rhythmia mapping system (Boston Scientific, Natick, Massachusetts). Results The 12 STA‐related AT (STA‐AT) circuits were classifiable as follows according to location of the optimal ablation line: (1) peri‐septal incision STA‐AT (n = 3), (2) cavotricuspid isthmus (CTI) dependent STA‐AT (n = 7), and (3) biatrial tachycardia (n = 2). Radiofrequency (RF) application terminated 11 of the 12 STA‐AT. We found that difference in STA‐AT circuit type was due to characteristics of the septal incision line made for STA. UHRM was important in identifying optimal ablation sites that did not create additional conduction disturbances in the right atrium (RA). Conclusions ATs after STA involve complex arrhythmia circuits due to multiple and long incision lines in the RA. Accurate understanding of the arrhythmia circuit and sinus conduction in the RA after STA is recommended for treating post‐surgical tachycardia in a minimally invasive manner.

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Section: Limitationsmentioning

confidence: 99%

Section: Limitationsmentioning

confidence: 99%