June 1, 2003Journal of Cardiovascular Electrophysiology
Phased‐Array Intracardiac Echocardiography for Defining Cavotricuspid Isthmus Anatomy During Radiofrequency Ablation of Typical Atrial Flutter
Key result
Phased-array intracardiac echocardiography permitted real-time imaging of the cavotricuspid isthmus, revealing increased posterior thickness post-ablation (3.8 vs 2.7 mm; P=0.02).
Why the study?
Does phased-array intracardiac echocardiography accurately define cavotricuspid isthmus anatomy and monitor tissue changes during radiofrequency ablation of typical atrial flutter?
Population
15 patients (mean age 64 +/- 9 years) undergoing radiofrequency ablation of typical atrial flutter
Design
Case_series
Authors
Discussion
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Implication
Supports phased-array ICE for CTI visualization in AFL; hypothesis-generating, requiring validation before practice change.
Key Points
- The study aims to evaluate the effectiveness of phased-array intracardiac echocardiography in imaging the cavotricuspid isthmus during radiofrequency ablation of atrial flutter.
- Fifteen patients underwent phased-array intracardiac echocardiography before and after radiofrequency ablation.
- ICE parameters measured include CTI length, pouch depth, and CTI thickness pre and post RFA.
- Analysis of variance was used to assess differences in CTI thickness pre and post RFA.
- CTI length was measured at 35 +/- 6 mm at end-ventricular systole, reducing to 30 +/- 6 mm at end-ventricular diastole (P = 0.02).
- Post-RFA thickness for mid CTI was 3.8 +/- 0.8 mm (P = 0.05 vs pre); posterior CTI was 3.8 +/- 0.8 mm (P = 0.02 vs pre).
- ICE guided RFA away from unfavorable anatomical features, resulting in effective lesions and diffuse CTI swelling.
Study Design
Type
Observational (n=15)
Structured PICO
Does phased-array intracardiac echocardiography accurately define cavotricuspid isthmus anatomy and monitor tissue changes during radiofrequency ablation of typical atrial flutter?
P
Population
15 patients (mean age 64 years) undergoing radiofrequency ablation of typical atrial flutter.
E
Exposure
Phased-array intracardiac echocardiography (ICE) imaging (7.5-10 MHz) before and after radiofrequency ablation
O
Outcome
Cavotricuspid isthmus (CTI) length, extent of pouching, and thickness pre/post radiofrequency ablationsurrogate
Phased-array ICE provides real-time, high-resolution imaging of the cavotricuspid isthmus, revealing dynamic anatomical changes and post-ablation tissue swelling that may facilitate atrial flutter ablation.
Cite This Study
Morton et al. (2003) conducted an observational in Typical atrial flutter (n=15). Phased-array intracardiac echocardiography was evaluated on Cavotricuspid isthmus thickness pre and post radiofrequency ablation. Phased-array intracardiac echocardiography permitted real-time imaging of the cavotricuspid isthmus, revealing increased posterior thickness post-ablation (3.8 vs 2.7 mm; P=0.02).