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Narrowing of the superior vena cava–right atrium junction during radiofrequency catheter ablation for inappropriate sinus tachycardia: analysis with intracardiac echocardiography

^a Clinical Electrophysiology Laboratory of the Allegheny University Hospitals, MCP and Hahnemann Divisions, Philadelphia, Pennsylvania, USA

View larger version (112K): [in a new window]   Figure 1 Narrowing of the SVC-RA junction with RF delivery. The ICE images are 10° oblique cross-sectional views oriented such that the ultrasound transducer is in the center of the image, posterior and superior structures are at the top of the image, anterior and inferior structures at the bottom and right-sided (lateral) structures to the viewer’s right. The arrows refer to the SVC-RA junction at the level of the superior lateral crista terminalis. In the left frame, the SVC-RA junction is shown at baseline (arrows). After RF delivery to the lateral crista terminalis (right frame), circumferential tissue swelling was noted, with a 40% reduction in the SVC-RA junction. The open arrowhead demonstrates a crater at RF lesion site. Ao, aorta; c, catheter; RPA, right pulmonary artery; RAA, right atrial appendage; SVC, superior vena cava.