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Angioscopic valvulotomy: evaluation of a new miniaturized prototype
M C Dalsing1, A M DeSanto, D A Heimansohn
1Department of Surgery, Indiana University Medical Center, Indianapolis 46202.
Summary
A new angioscopic valvulotomy device effectively cuts vein valve leaflets but requires more operative time and may cause more trauma than the standard Mills technique. Further study is needed to assess risk versus benefit for in situ bypass procedures.
Area of Science:
- Vascular Surgery
- Minimally Invasive Procedures
- Surgical Instrumentation
Background:
- Venous valvulotomy is crucial for in situ arterial bypass procedures.
- Standard techniques involve blind leaflet incision.
- A novel angioscopically-guided instrument offers direct visualization during valvulotomy.
Purpose of the Study:
- To compare the efficacy and safety of a new angioscopically-directed valvulotome with the standard Mills valvulotome.
- To evaluate operative time, technical difficulty, and histological outcomes.
- To assess venous patency and intraluminal trauma.
Main Methods:
- Comparison of angioscopic valvulotomy versus Mills valvulotome in 18 mongrel dogs.
- Valvulotomy performed on femoral veins under direct vision (angioscope) or blindly (Mills).
- Assessment via venography, gross examination, and histological analysis at various time points.
Main Results:
- Both techniques successfully incised valve leaflets.
- Angioscopic valvulotomy took significantly longer (8.0 min vs 0.8 min; P < .001).
- The Mills technique resulted in more histologically normal veins (14/18 vs 8/18; P < .05), suggesting less trauma.
Conclusions:
- The angioscopically-directed device is effective for venous valvulotomy.
- It is more technically demanding and potentially more traumatic than the Mills technique.
- While not more thrombogenic, the degree of intraluminal trauma requires further evaluation before widespread adoption.