Browsing by Author "Ozyer, Umut"

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    Diagnosis and Treatment of Takayasu Arteritis in Turkey: A Single Center Results
    (2015) Akay, Tankut; Harman, Ali; Yucel, Eftal; Ozyer, Umut; Gultekin, Bahadir; 0000-0002-4300-009X; 0000-0002-7386-7110; AAK-9071-2021; ABA-7388-2021; K-9824-2013
    Background: This study aims to evaluate clinical, laboratory, and radiological features as well as the surgical and endovascular procedure outcomes of patients with Takayasu arteritis in our hospital. Methods: Hospital records of 38 patients who were followed with the diagnosis of Takayasu arteritis between April 2002 and January 2014 were retrospectively evaluated. Records included the clinical history of Takayasu arteritis, comorbid diseases, laboratory and angiographic findings at the time of diagnosis, and mode of treatment. Results: The female/male ratio was 3.75:1. According to angiographic classification; 11 patients were type 1, three patients were type 2a, three patients were type 2b, four patients were type 3, six patients were type 4, and 11 patients were type 5. Eighteen of 38 patients were administered endovascular or surgical intervention (8 surgeries and 10 endovascular procedures). There was no early mortality. Conclusion: Demographic and angiographic features of our patients were similar to those of Japan and Mediterranean populations. The long-term follow-up of endovascular procedure success, and the management of restenosis may be among challenges to be faced in the future. Bypass surgery remains the gold standard for achieving long-term patency. Endovascular treatment may provide short-term symptom relief in patients who are not suitable for surgical treatment.
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    Endovascular Management of Arterial Complications Following Renal Transplant Biopsy
    (2018) Ozyer, Umut; Harman, Ali; Soy, Ebru H. Ayvazoglu; Aytekin, Cuneyt; Boyvat, Fatih; Haberal, Mehmet; 0000-0002-4300-009X; 0000-0002-7386-7110; 0000-0002-0993-9917; 0000-0002-3462-7632; AAK-9071-2021; K-9824-2013; AAC-5566-2019; F-4230-2011; AAJ-8097-2021
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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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    Fluoroscopically Guided Retrograde Double-J Stent Removal in Renal Transplant Patients
    (2018) Aytekin, Cuneyt; Harman, Ali; Ozyer, Umut; Akdur, Aydincan; Boyvat, Fatih; Haberal, Mehmet; 0000-0002-7386-7110; 0000-0002-4300-009X; 0000-0002-8726-3369; 0000-0002-3462-7632; K-9824-2013; AAK-9071-2021; AAA-3068-2021; F-4230-2011; AAJ-8097-2021
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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.
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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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    Percutaneous Biopsy of Hepatocellular Cancer Using Coaxial Needle System and Track Cauterization to Prevent Bleeding and Seeding
    (2018) Boyvat, Fatih; Haberal, Mehmet; Harman, Ali; Akdur, Aydincan; Ozyer, Umut; Selcuk, Haldun; Moray, Gokhan; 0000-0002-3462-7632; 0000-0002-7386-7110; 0000-0002-8726-3369; 0000-0002-4300-009X; 0000-0002-8445-6413; 0000-0003-2498-7287; F-4230-2011; AAJ-8097-2021; K-9824-2013; AAA-3068-2021; AAK-9071-2021; AAJ-6976-2021; AAE-1041-2021
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    Percutaneous Ultrasound Guided Biliary Interventions After Pediatric Liver Transplantation Using Fine Needle and 0.014 Inch Guide-Wire
    (2016) Boyvat, Fatih; Harman, Ali; Soy, Ebru H. Ayvazoglu; Ozyer, Umut; Kirnap, Mahir; Moray, Gokhan; Haberal, Mehmet; https://orcid.org/0000-0002-7386-7110; https://orcid.org/0000-0002-0993-9917; https://orcid.org/0000-0002-4300-009X; https://orcid.org/0000-0003-2498-7287; https://orcid.org/0000-0002-3462-7632; F-4230-2011; K-9824-2013; AAC-5566-2019; AAK-9071-2021; AAH-9198-2019; AAE-1041-2021; AAJ-8097-2021
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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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    Ultrasound-Guided Brachiocephalic Vein Catheterization in Infants Weighing Less than Five Kilograms
    (2015) Aytekin, Cuneyt; Ozyer, Umut; Harman, Ali; Boyvat, Fatih; 0000-0002-4300-009X; 0000-0002-7386-7110; 0000-0001-5134-168X; 26044899; F-4230-2011; AAK-9071-2021; K-9824-2013
    Purpose: To describe our experience with the use of ultrasound-guided supraclavicular brachiocephalic vein approach for central vein catheterization in infants weighing less than 5 kg. Methods: A retrospective review was performed for infants who underwent ultrasound-guided central vein catheterization from January 2012 to November 2014. Infants weighing less than 5 kg with supraclavicular brachiocephalic vein access were included in the study. Indications for central venous access, venous access side, catheter type and complications were evaluated. Results: Thirty-four catheterizations in 34 infants weighing from 1.5 to 4.9 kg (median 3.48 kg) were included in the study (aged 11 days to 7 months and 10 days, weight range 1.5 to 4.9 kg). Technical success rate was 97% (33 of 34 infants). No technical or clinical major complications were observed. Conclusions: Ultrasound-guided supraclavicular brachiocephalic vein access is a favorable alternative for central venous catheterization in low-weight infants with regard to high technical success rate and absence of major complications.