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Experimental ablation study using a new long linear probe in isolated porcine hearts
E Shimoike1, N Ueda, T Maruyama
1First Department of Internal Medicine, Kyushu University School of Medicine, Japan.
Japanese Heart Journal
|July 27, 1999
Summary
A novel linear probe effectively creates transmural cardiac lesions using radiofrequency energy. Lesion size increases with power, contact pressure, and duration, offering potential for atrial fibrillation surgery.
Area of Science:
- Cardiac Electrophysiology
- Minimally Invasive Surgical Techniques
Background:
- Atrial fibrillation management often requires surgical ablation.
- Current techniques may have limitations in creating precise, linear lesions.
Purpose of the Study:
- To evaluate a novel custom-made linear probe for creating long, transmural cardiac lesions.
- To assess the impact of radiofrequency energy parameters on lesion characteristics.
Main Methods:
- Radiofrequency (RF) energy was applied using a 25-mm linear probe in 90 isolated porcine hearts.
- Parameters varied independently: energy power, contact pressure, and duration.
- Lesion dimensions (length, width, transmurality) were measured.
Main Results:
- All 90 lesions were transmural and well-demarcated.
- Lesion length and width significantly increased with higher power, contact pressure, and duration.
- Maximum lesion width achieved was 3.7 mm, with no observed overheating.
Conclusions:
- The novel linear probe is effective for creating transmural linear cardiac lesions.
- This technique shows promise for improving the maze surgical procedure for atrial fibrillation.