Importance of Tachycardia Cycle Length for Differentiating Typical Atrial Flutter from Scar-Related in Adult Congenital Heart Disease

作者：Uhm Jae Sun; Mun Hee Sun; Wi Jin; Shim Jaemin; Hwang Hye Jin; Sung Jung Hoon; Kim Jong Youn; Pak Hui Nam; Lee Moon Hyoung; Joung Boyoung^*

来源：Pacing and Clinical Electrophysiology, 2012, 35(11): 1338-1347.

DOI：10.1111/j.1540-8159.2012.03494.x

• atrial flutter
• cavotricuspid isthmus
• congenital heart disease
• intraatrial reentrant tachycardia
• scar-related

Background: Radiofrequency catheter ablation (RFCA) for intraatrial reentrant tachycardia (IART) in congenital heart disease (CHD) remains difficult.
Methods: Thirty-four consecutive adult patients (age, 37.6 +/- 12.8 years; male, 21) with previously repaired CHD and IART underwent an electrophysiological study and RFCA. CHD included atrial septal defect (ASD, n = 14), tetralogy of Fallot (n = 11), ventricular septal defect (n = 4), pulmonary atresia (n = 2), atrioventricular septal defect (n = 1), transposition of the great arteries (n = 1), and double-outlet right ventricle (n = 1).
Results: Duration of CHD repair to IART onset was 19.1 +/- 8.5 years. Thirty and four patients had single- and double-loop reentrant tachycardia, respectively. Among the total of 38 IARTs, which were mapped, 22 (57.9%) and 13 (34.2%) IARTs were cavotricuspid isthmus (CTI)-dependent atrial flutter (AFL) and scar-related AFL, respectively. Typical AFL electrocardiography findings including definite sawtooth appearance in inferior leads and positive F wave in lead V1 were observed in only 12 of 21 patients (57.1%) with CTI-dependent AFL. CTI-dependent AFL had a significantly longer tachycardia cycle length (TCL) than scar-related AFL (267.6 +/- 34.4 ms and 235.9 +/- 37.0 ms, respectively; P = 0.031). TCL > 250 ms had 79% sensitivity as the cutoff value for differentiating CTI-dependent from scar-related AFL. The acute success rates of RFCA in CTI-dependent and scar-related AFLs were 85.7% and 90.0%, respectively. The recurrence rates in CTI-dependent and scar-related AFLs were 11.1% and 11.1%, respectively, during a follow-up of 21.2 +/- 28.3 months.
Conclusions: CTI-dependent AFL was the most common IART in adult patients with repaired CHD and was easily manageable by RFCA. TCL might help to differentiate CTI-dependent AFL from other IARTs. (PACE 2012;35:13381347)

• 出版日期2012-11