Wos İndeksli Açık & Kapalı Erişimli Yayınlar

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Author: search.filters.author.Ozyer, Umut

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    Long-term results of endovascular treatment for arteriovenous dialysis access thrombosis in 143 patients: A single center experience
    (2019) Yilmazsoy, Yunus; Ozyer, Umut; 31379248
    Objective: This study aimed to determine the long-term patency duration and rate of thrombosis of autologous arteriovenous fistulas and synthetic grafts treated with endovascular methods in a large patient population. Methods: A total of 144 arteriovenous accesses (37 radiocephalic, 51 brachiobasilic, 41 brachiocephalic, and 15 femorofemoral) from 143 patients were included in the study. A total of 304 endovascular thrombolytic treatment procedures were performed for 94 (65%) arteriovenous fistula and 50 (35%) arteriovenous graft accesses. Results: The procedural technical success rate was 98.7%. The mean follow-up duration was 32.5 (range, 3-132 months). The primary patency rates for arteriovenous fistulas and arteriovenous grafts were 78% and 78% at 6 months, 66% and 63% at 1 year, and 45% and 0% at 36 months, respectively. The assisted primary patency rates for arteriovenous fistulas and arteriovenous grafts were 82% and 84% at 6 months, 71% and 69% at 1 year, 51% and 29% at 36 months, and 30% and 1% at 60 months, respectively. The secondary patency rates for arteriovenous fistulas and arteriovenous grafts were 94% and 93% at 6 months, 85% and 85% at 1 year, 58% and 59% at 36 months, and 47% and 48% at 60 months, respectively. Conclusion: Although the primary patency durations for arteriovenous fistulas were better after endovascular thrombolytic treatment than those for arteriovenous grafts, the long-term outcomes of assisted primary and secondary patency durations after repeated procedures were similar for both types of arteriovenous accesses.
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    Treatment with ultrasound guided percutaneous cholecystostomy in acute cholecystitis: 10-year a single-center experience
    (2017) Ozyer, Umut; Yildirim, Muge; Yildirim, Utku Mahir; 0000-0002-4300-009X; AAK-9071-2021; AAK-9071-2021
    Purpose: Evaluating the technical success, clinical outcomes and safety of ultrasound-guided percutaneous cholecystostomy (PC) in patients with acute cholecystitis. Material and Methods: Medical records of patients diagnosed as acute cholecystitis and treated with PC from year 2000 to 2011 were retrospectively examined. ASA scores, leukocyte counts, gall stone presence, bile cultures, additional interventions, interval surgery, procedure-related complications and mortality were reviewed. Results: PC catheters were placed in 127 patients (72 male, 55 female) aged from 31 to 100 years. Technical success of the procedure was 100%. Clinical success was obtained in 86% of the patients. No procedure related mortality or early major complications were observed. Minor complication rate was 7% (9/127) and late major complication rate was 3% (4/127). Thirty day in-hospital mortality rate was 8% (10/127). Six patients died after interval cholecystectomy and 4 patients died before the operation. PC served as a definitive treatment in 74% (17/23) of the patients with acalculous cholecystitis. Fifty-eight percent (31/53) of the patients with acute calculous cholecystitis were treated only with percutaneous cholecystostomy and only 10% (3/31) had recurrent cholecystitis in follow up. Conclusion: PC can be preferred over primary cholecystectomy in acute cholecystitis patients. The procedure has high technical success, high clinical response and low complication rates. It can also serve as a definitive treatment option in patients with high surgical risk.
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    Endovascular Management of Surgically Uncontrolled Hemorrhage Following Post-Radical Nephrectomy: A Case Report
    (2018) Dirim, Ayhan; Ozyer, Umut; 0000-0002-4300-009X; AAK-9071-2021
    We present an isolated right lumbar arterial hemorrhage following right radical nephrectomy. Surgical re-exploration was unsuccessful therefore active bleeding was diagnosed and treated with endovascular approach.
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    Lomber spinal anjiyolipom: a case report
    (2018) Rahatli, Feride Kural; Ozyer, Umut; 0000-0002-4300-009X; 0000-0002-4226-4034; AAK-9071-2021; AAL-9808-2021
    Lumbar spinal angiolipomas are rarely seen tumors which present with progressive spinal cord and/or root compression symptoms. Definitive diagnosis with magnetic resonance imaging (MRI) is possible because of their unique signal characteristics. However, probable misdiagnosis is likely due to the infrequency of these tumors. This article reports the case of a 53-year old woman with progressively worsening low back and hip pain in last 6 months. MRI demonstrated a sharply demarcated extradural mass which was hyperintense to cerebrospinal fluid and hypointense to epidural fat on T1-weighted images. The signal was suppressed in fatsaturated images and the mass showed diffuse enhancement after contrast administration.