Person: NAS, ÖMER FATİH
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NAS
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ÖMER FATİH
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Publication Diagnostic utility of superb microvascular imaging in depiction of corkscrew collaterals in Buerger's disease(Wiley, 2020-05-27) Nas, Ömer Fatih; Kandemirli, Sedat Giray; Erdemli Gürsel, Başak; Bilgin, Cem; Korkmaz, Barış; Yolgösteren, Atıf; İnecikli, Mehmet Fatih; NAS, ÖMER FATİH; Kandemirli, Sedat Giray; ERDEMLİ GÜRSEL, BAŞAK; BİLGİN, CEM; KORKMAZ, BARIŞ; YOLGÖSTEREN, ATIF; İNECİKLİ, MEHMET FATİH; Bursa Uludağ Üniversitesi/Tıp Fakültesi/Radyoloji Anabilim Dalı.; Bursa Uludağ Üniversitesi/Tıp Fakültesi/Kalp ve Damar Cerrahisi Anabilim Dalı.; 0000-0002-4467-3915; AAG-2372-2021; HHS-7433-2022; AAK-5124-2020; AAG-8561-2021; AAH-6568-2021; A-1409-2017; FHT-9776-2022Purpose To evaluate the corkscrew collaterals in Buerger's disease by superb microvascular imaging (SMI) and power Doppler ultrasonography (PDU). Methods We evaluated with SMI and PDU 14 patients with Buerger's disease in whom corkscrew collaterals had been identified on digital subtraction angiography (DSA). Corkscrew collaterals were classified on DSA and PDU based on their size and morphology. Results A total of 17 vascular regions of collateral vessel formation were assessed. Based on DSA classification, there were three cases of type I collaterals (arterial diameter of >2 mm with large helical pattern), seven cases of type III collaterals (arterial diameter of 1-1.5 mm with small helical pattern), and seven cases of type IV collaterals (arterial diameter of <1 mm with tiny helical pattern). On PDU, all type I collaterals on DSA appeared as "large snake" images, all type III collaterals on DSA appeared as "small snake" images, and all type IV collaterals on DSA appeared as dots. SMI imaging, both in color and monochrome mode, provided superior demonstration of the continuity of the vessel of large or small "snake" images. In cases appearing as dot pattern on PDU, color SMI was able to show continuity of the flow signal as a helical pattern. Discussion SMI is a promising new Doppler imaging technique that is superior to conventional power Doppler imaging in depiction and identification of corkscrew collaterals in Buerger's disease.Publication Direct aspiration thrombectomy experience with the SOFIA 6F catheter in acute ischemic stroke(Springer, 2021-01-19) Bilgin, Cem; Durmuş, Yavuz; Haki, Cemile; Nas, Ömer Fatih; Hakyemez, Bahattin; NAS, ÖMER FATİH; HAKYEMEZ, BAHATTİN; Uludağ Üniversitesi/Tıp Fakültesi/Radyoloji Anabilim Dalı; 0000-0002-3425-0740; AAG-8561-2021; AAI-2318-2021Introduction As the SOFIA (Soft torqueable catheter Optimized For Intracranial Access) 6F catheter has a large luminal diameter, it can be used as an aspiration catheter. Furthermore, it may function as an intermediate catheter when a stent retriever is required. Purpose We aimed to evaluate the usefulness of the SOFIA 6F catheter in mechanical thrombectomy with the direct aspiration first pass technique.Method Patients who had undergone mechanical thrombectomy (September 2017-January 2019) using the SOFIA 6F catheter in two centers were retrospectively analyzed. We used the thrombolysis in cerebral infarction (TICI) scale to evaluate the success of recanalization. National Institutes of Health Stroke Scale scores on admission and discharge were used together with the modified Rankin Scale (mRS) scores at 90 days.Results In 132 (89.1%) of the 148 cases, the thrombus was in the anterior system. The SOFIA 6F catheter reached the thrombus site in 130 (87.8%) cases. The rate of successful recanalization (TICI >= 2b) was 89.1%. The targeted clinical outcome (mRS score <= 2 at 90th days) was achieved in 49.3% of cases. Symptomatic intracranial hemorrhage occurred in 5.4%. The rate of emboli to new vascular territories was 5.4%. Mortality was 14.1%.Conclusion In the majority of our cases, the SOFIA 6F catheter provided effective and rapid recanalization with aspiration thrombectomy.Publication Demonstration of corkscrew collaterals in buerger's disease by superb microvascular imaging(Elsevier, 2019-09-01) Kandemirli, Sedat Giray; Gürsel, Başak Erdemli; ERDEMLİ GÜRSEL, BAŞAK; Yolgösteren, Atıf; YOLGÖSTEREN, ATIF; Nas, Ömer Fatih; NAS, ÖMER FATİH; Bursa Uludağ Üniversitesi/Tıp Fakültesi; 0000-0002-4467-3915; AAH-6568-2021; AAG-8561-2021; AAG-2372-2021Publication An assessment of slap type 5 lesions using proton density oblique sagittal imaging in magnetic resonance arthrography(Sage Publications, 2021-12-10) Öngen, Gökhan; Gökalp, Gökhan; Nas, Ömer Fatih; ÖNGEN, GÖKHAN; GÖKALP, GÖKHAN; NAS, ÖMER FATİH; Bursa Uludağ Üniversitesi/Tıp Fakültesi/Radyoloji Anabilim Dalı.; 0000-0002-3682-2474; FQR-8472-2022; GMO-0473-2022; AAG-8561-2021Background Bankart lesions accompany superior labrum anteroposterior (SLAP) lesions; these are called SLAP type 5. Purpose To compare SLAP type 5 lesions using routine magnetic resonance arthrography (MRA) and thin-slice oblique sagittal proton density (PDW) sequences and correlation operation results. Material and Methods In total, 181 patients were admitted with shoulder instability. The study was completed with 44 patients. The presence or absence of isolated Bankart and SLAP type 5 lesions in routine MRA and PDW oblique sagittal images were evaluated separately. Absence of rupture scored 0 points, suspected ruptures scored 1 point, and apparent ruptures scored 2 points. The two scores were compared with the shoulder arthroscopy findings. Results According to the findings in the shoulder arthroscopy, 40 patients had Bankart lesions and 17 patients had accompanying SLAP type 5 lesions. To detect a Bankart lesion, there was no significant difference between routine MRA sequences and PDW oblique sagittal images (P = 0.061). Routine MRA sensitivity was 95%, specificity 25%, positive predictive value (PPV) 92%, negative predictive value (NPV) 33%, while for PDW oblique sagittal images, sensitivity was 75%, specificity 100%, PPV 100%, and NPV 28.5%. In 8/17 type 5 SLAP lesions, routine MRA detected sensitivity 47%, specificity 92.6%, PPV 80%, and NPV 73.5%; in 14/17 SLAP type 5 lesions, PDW oblique sagittal images detected sensitivity 82%, specificity 100%, PPV 100%, and NPV 90% (P = 0.015). Conclusion The PDW oblique sagittal images may play a significant role in assessing the anterior and superior extent of the tears.Publication Right- versus left-sided approach for transhepatic tunneled catheter placement: Is there a difference?(Springer, 2021-04-08) Nas, Ömer F.; Candan, Selman; Öztepe, Muhammed F.; Kandemirli, Sedat G.; Bilgin, Cem; İnecikli, Mehmet F.; Özkaya, Güven; Gökalp, Gökhan; Öngen, Gökhan; Erdoğan, Cüneyt; NAS, ÖMER FATİH; CANDAN, SELMAN; Öztepe, Muhammed F.; İNECİKLİ, MEHMET FATİH; ÖZKAYA, GÜVEN; GÖKALP, GÖKHAN; ÖNGEN, GÖKHAN; Bursa Uludağ Üniversitesi/Tıp Fakültesi/Radyoloji Anabilim Dalı.; Bursa Uludağ Üniversitesi/Sağlık Bilimleri Enstitüsünde/Biyoistatistik Bilim Dalı.; 0000-0003-0297-846X; 0000-0002-3682-2474; AAK-5124-2020; HHS-7433-2022; GVS-7682-2022; AAG-8561-2021; DLB-1623-2022; IVU-2672-2023; GMO-0473-2022; FQR-8472-2022Objective We aimed to compare the technical difficulties, complications, long-term efficacy, and risks between right- and left-sided approach transhepatic tunneled catheterization. Methods We retrospectively evaluated transhepatic tunneled catheter placement cases in our institution between May 2012 and November 2019. Demographic and procedural parameters were recorded. Statistical tests were used to compare the complication rates of right- and left-sided approach. Furthermore, Cox regression analyses were used to investigate the relationship between functional catheter days and included parameters. Results A total of 83 procedures were performed in 46 patients, with a female to male ratio of 1.88 and a mean age of 55.5 +/- 18.2 years. Indication for catheter placement was chronic renal insufficiency and loss of central venous access through traditional routes in all cases. Median functional catheter durations were 28 days (1-382) and 55.5 days (1-780) for right-sided and left-sided access, respectively. Complication rates were similar for both sides. There was no difference between primary and revision procedures in terms of safety and efficacy outcomes. In univariate Cox regression analysis, gender was the only variable which was found to be statistically significant (HR = 2.014 (1.004-4.038)) for functional catheter days. In multivariate Cox regression model, gender and access side were included which failed to reach statistical significance. Conclusions In our study, both right- and left-sided approaches provided similar safety and efficacy outcomes, suggesting that both techniques can be employed based on physician's preference.Publication Tunneled peritoneal catheter placement in palliation of malignant ascites: A study with two different types of catheters(Hindawi, 2019-05-15) Kaya, Ahmet; Nas, Ömer F.; Erdoğan, Cüneyt; NAS, ÖMER FATİH; Bursa Uludağ Üniversitesi/Tıp Fakültesi/Radyoloji Anabilim Dalı.; AAG-8561-2021Objective(s). Malignant ascites (MA) is abnormal accumulation of fluid in the peritoneal cavity and has negative effects on the quality of life. The purpose of this retrospective study is to explore feasibility, safety and efficacy of tunneled peritoneal catheter placement using both peritoneal dialysis and hemodialysis catheters in the palliation of MA. Methods. Between October 2013-June 2016, thirty patients with resistent MA underwent tunneled peritoneal catheterisation in our interventional radiology department. Tunneled peritoneal catheter (TPC) was placed in 22 (n=22/30; %73) patients, tunneled hemodialysis catheter (THC) was placed in 8 patients (n=8/30; %27). Routine visits were scheduled for months 1, 3, 6, 9, and 12 of the catheterization, and the records were evaluated retrospectively. Results. The overall duration of catheterization varied from 2 to 334 days (mean 66.4 +/- 68.5, median: 57 days). Catheters remained intact in 29 patients (96.7%) until the endpoint. There was one (3.3%) malfunctioning catheter among both groups. Overall, four patients developed infection, which were classified into major (n=2/30, %6.7) and minor (n=2/30, %6.7) complications according to SIR criteria. Conclusion. Tunneled peritoneal catheterization using both TPCs and THCs provided a safe method with relatively high patency, and low infection and systemic complication rates in the palliation of MA.Publication Endovascular treatment modalities for basilar artery fenestration aneurysms: Experience of two centers and literature review(Tübitak Bilimsel ve Teknolojik Araştırma Kurumu, 2021-01-01) Korkmaz, Mehmet; Çınar, Celal; Nas, Ömer Fatih; Hakyemez, Bahattin; Oran, İsmail; NAS, ÖMER FATİH; HAKYEMEZ, BAHATTİN; Bursa Uludağ Üniversitesi/Tıp Fakültesi/Radyoloji Anabilim Dalı; 0000-0002-3425-0740; AAI-2318-2021; AAG-8561-2021Background/aim: The aim of this study is to present our experience on various endovascular treatment modalities of basilar fenestration aneurysms and reviewing our findings together with literature data. Materials and methods: A total of 26 basilar artery fenestration (BAF) aneurysms in 24 patients were endovascularly treated in two different neurointerventional radiology clinics. All patients had been evaluated with computed tomography (CT), CT angiography, and digital subtraction angiography before the procedure. Results: Aneurysms of all patients were successfully occluded (technical success rate 100%). Procedure-related complications were seen in two patients. Our comprehensive literature research revealed that studies related with the topic are composed mostly of case reports. In the literature, a total of 113 BAF aneurysms of 101 patients had been treated endovascularly in 46 studies between 1993 and 2019. Success rate of the treatment was reported as 97%, clinical success rate as 91%, and complication rate as 8.8%, while these rates are 100%, 92%, and 7.6% in our study, respectively. Conclusion: Although the number of cases is low in our study, to our knowledge, it is the widest series in the literature until today. Our results demonstrate that BAF aneurysms can be treated successfully and safely with different endovascular techniques, with more stent use in recent years.