Zusammenfassung
Purpose: Evaluation of the handling, technical success rate, and six-months patency rate of a new, premounted balloon-expandable stent in ostial renal artery stenoses. Material and Methods: in a prospective study, 27 ostial renal artery stenoses in 20 patients were primarily treated with the new "Renal Bridge Stent" (Medtronic AVE, Dusseldorf). All patients had a history of hypertension and 8 ...
Zusammenfassung
Purpose: Evaluation of the handling, technical success rate, and six-months patency rate of a new, premounted balloon-expandable stent in ostial renal artery stenoses. Material and Methods: in a prospective study, 27 ostial renal artery stenoses in 20 patients were primarily treated with the new "Renal Bridge Stent" (Medtronic AVE, Dusseldorf). All patients had a history of hypertension and 8 patients had renal dysfunction. The handling and visibility of the stent was scored on a three grade scale by the operators. Follow-up angiography including intra-arterial trans-stenotic pressure measurements was performed in 23 out of 27 stenoses (17 patients). Results: Handling and visibility were scored as good by all operators. 26 of 27 stenoses were treated with technical success by implantation of 28 stents. The mean degree of stenosis was reduced from 74.2% to less than 5%. At 6 months, 8 stents out of 23 (35%) showed a significant in-stent stenosis (stenosis degree > 50% and intra-arterial pressure gradient > 10 mmHg). The stenosis rates were 63% using 5-mm stents, 30% using 6-mm stents, and 0% using 7-mm stents. Conclusion: Endovascular treatment of ostial renal artery stenosis with the used stent is safe and effective. The new stent shows a good handling and visibility. The high rate of in-stent stenoses might be explained by the rigid follow-up protocol including angiography, trans-stenotic pressure measurements, and the high number of 5-mm vessels in our study.
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