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(Circulation. 1999;99:E5.)
© 1999 American Heart Association, Inc.

Circulation Electronic Pages

Radiofrequency Ablation of Atrial Flutter

Etienne Delacretaz, MD, ; William G. Stevenson, MD, ; Gayle L. Winters, MD, ; Peter L. Friedman, MD, PhD,

From the Department of Medicine, Cardiovascular Division, and the Department of Pathology (G.L.W.), Brigham and Women's Hospital, Harvard Medical School, Boston, Mass.

Correspondence to W.G. Stevenson, MD, Cardiovascular Division, Brigham and Women's Hospital, 75 Francis St, Boston, MA 02115.

A33-year-old man with cardiac and pulmonary sarcoidosis developed ventricular tachycardia managed with an implantable cardioverter-defibrillator and amiodarone therapy. Subsequently, episodes of atrial flutter triggered spurious therapies from the implantable cardioverter-defibrillator, and the patient underwent electrophysiological evaluation. Common atrial flutter (caudocranial septal and counterclockwise right atrial activation) was induced, with a cycle length of 270 ms. Entrainment with a postpacing interval equal to the flutter cycle length was demonstrated in the right atrial inferior isthmus (Figure 1A), indicating that this region was part of the macroreentrant circuit. A steerable 7F quadripolar 4-mm-tip thermistor radiofrequency (RF) ablation catheter (EP Technologies, Inc) was used to make a line of RF lesions extending from the tricuspid annulus to the inferior vena cava until bidirectional isthmus conduction block could be demonstrated. Atrial flutter ended during RF current application (Figure 1B). Subsequently, there was no recurrence of atrial flutter. However, progressive heart failure and frequent episodes of ventricular tachycardia continued, and heart transplantation was performed 3 weeks after RF ablation of atrial flutter. The explanted heart was examined after removal. A diaphragmatic view of the heart illustrates the relationship of the right atrial inferior isthmus with the coronary vessels (Figure 2). A longitudinal section of the right AV groove is seen in Figure 3A. RF lesions extended to depths up to 2 mm, whereas the distance from the endocardial surface at the ablation site to the right coronary artery is 4 mm. Microscopically, the RF lesions were characterized by coagulation necrosis with . . . [Full Text of this Article]