Browsing by Author "Oguzkurt, L."

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    Central venous occlusion in hemodialysis access: Comparison between percutaneous transluminal angioplasty alone and nitinol or stainless-steel stent placement
    (2019) Gur, S.; Oguzkurt, L.; Gedikoglu, M.; 30952526
    Purpose: The purpose of this study was to compare the primary and secondary patency rates occlusion; of percutaneous transluminal angioplasty (PTA) atone with those of metallic stent placement Angioplasty; in patients with hemodialysis access and central venous occlusion (CVO) and to compare the Hemodiatysis; respective effects of nitinol and stainless-steel stents on patency. Materials and methods: A total of 150 consecutive patients with hemodialysis access who under-went endovascular treatment for symptomatic CVO with ipsilateral functioning hemodialysis access were evaluated. There were 67 men and 83 women with a mean age of 56.2 +/- 15.2 (SD) years (range: 15-86 years). The primary endovascular treatment of CVO was PTA alone. Stent placement either with nitinol or stainless-steel stents was performed as a bailout procedure. The results were analyzed on a per patient basis. Results: Technical success was achieved in 141/150 patients (94%). Of the 141 patients, 109 (77%) underwent PTA alone and 32 (23%) underwent stent placement. The mean number of interventions in the stent group [4.3 +/- 2.5 (SD)] was significantly higher than that in the PTA alone group [2.6 +/- 2.8 (SD)] (P=0.002). The primary patency rates at 12, 24, and 60 months for the stent group (58.7%, 41.9%, and 27.9%, respectively) were significantly higher than those in the PTA alone group (42.4%, 36.3%, and 20.2%, respectively) (P=0.036). Secondary patency rates at 12, 24, and 60 months for the stent group (87.6%, 80.7%, and 50.3%, respectively) were significantly greater than those in the PTA alone group (68.4%, 56%, and 38.6%, respectively) (P = 0.046). Furthermore, the primary patency rates at 6 and 12 months in the nitinol stent group (89% and 80.9%, respectively) were significantly greater than those in the stainless-steel stent group (78.8% and 38.4%, respectively) (P= 0.007). The secondary patency rates at 6, 12 and 24 months for the nitinol stent group (92.8%, 87.7% and 65.8%, respectively) were significantly greater than those in the stainless-steel stent group (85.7%, 76.2% and 65.3%, respectively) (P=0.011). Conclusion: Although PTA alone is an effective interventional treatment strategy of CVO in short term, stent placement yields greater primary and secondary patency rates in the long-term. But the mean number of interventions per vein after stenting is significantly higher. Close follow-up and multiple re-interventions are necessary to ensure long-term patency. (C) 2019 Societe francaise de radiologie. Published by Elsevier Masson SAS. All rights reserved.
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    Risk Factors Associated with Recanalization of Incompetent Saphenous Veins Treated with Radiofrequency Ablation Catheter
    (2017) Nayman, A.; Yildiz, I.; Koca, N.; Deniz, S.; Koplay, M.; Oguzkurt, L.; 27373341
    Purpose: The purpose of this study was to determine the occlusion rate of incompetent great saphenous veins (GSVs) and small saphenous veins (SSVs) treated with radiofrequency ablation (RFA) and individualize variables associated with recanalization. Materials and methods: A retrospective review of 311 veins (256 GSVs and 55 SSVs) in 211 patients [177 women, 34 men; mean age, 45 years +/- 12 (SD) (range: 18-75 years)] with incompetent GSVs and/or SSVs who were treated using new-generation RFA catheters was performed. The clinical results, occlusion rates, and variables associated with recanalization for the incompetent GSVs and SSVs were analyzed. Results: No major complications were observed in the study population. Ten months after RFA, the occlusion rate was 89% (227/256) for GSVs and 91% (50/55) for SSVs. An increased pre-procedure diameter of the incompetent GSVs was associated with a higher rate of recanalization (OR: 0.825; 95% CI: 0.715-0.952) (P < 0.05). No significant differences in age, gender, and side of treated veins were found between patients with recanalization of treated veins and those without recanalization. Conclusion: Our results show that pre-procedure diameter of the GSV is the single risk factor for recanalization after RFA. (C) 2016 Editions francaises de radiologie. Published by Elsevier Masson SAS. All rights reserved.