Person: NAS, ÖMER FATİH
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NAS
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ÖMER FATİH
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Publication The association between the CT severity index and the pulmonary artery area in COVID-19 pneumonia(Sage Publications Ltd, 2022-01-24) Ongen, Gökhan; Gökalp, Gökhan; Nas, Ömer Fatih; Özpar, Rıfat; Candan, Selman; ÖNGEN, GÖKHAN; GÖKALP, GÖKHAN; NAS, ÖMER FATİH; ÖZPAR, RİFAT; Tıp Fakültesi; Radyoloji Ana Bilim Dalı; 0000-0001-6649-9287; FQR-8472-2022; GMO-0473-2022; AAG-8561-2021; AAH-5062-2021Background The pulmonary artery area (PAA) is a valuable non-invasive method for the diagnosis of pulmonary hypertension. Purpose To compare the change in PAA in patients with COVID-19 with the computed tomography (CT) severity index using follow-up imaging. Material and Methods A total of 81 patients who were followed up and underwent CT assessment more than once at our hospital's pandemic department were evaluated retrospectively. Patients with progression were separated into three groups: progression ranging from mild-to-mild infiltration (Group A, CT severity index of 0-2); progression from mild to severe infiltration (Group B, CT severity index of 0-2 to 3-5); and progression from severe-to-severe infiltration (Group C, CT severity index of 3-5). The PAAs were calculated separately. Results The mean age was 56 +/- 12 years. In terms of those patients showing progression in the CT images, the number of patients in Groups A, B, and C was 29, 40, and 12 in the right lung; 32, 45, and 4 in the left lung; 23, 45, and 13 on both lungs, respectively. There was no significant difference between the main, right, and left PAAs in Group A (P > 0.05). In Group B, there were significant increases in the areas of the main, right, and left PAAs (P < 0.05). There were also significant increases in the areas of the right and main pulmonary arteries in Group C (P < 0.05). Conclusion PAAs increase as disease involvement advances in cases with COVID-19 pneumonia, which is thought to be correlated with progression.Publication Evaluation of recurrent vertebral hydatid cyst with computed tomography myelography in a case with spinal instrumentation(Elsevier Science, 2015-11-01) Sanal, Bekir; Nas, Ömer Fatih; Büyükkaya, Ramazan; Hacıkurt, Kadir; Hakyemez, Bahattin; NAS, ÖMER FATİH; Hacıkurt, Kadir; HAKYEMEZ, BAHATTİN; Tıp Fakültesi; Radyoloji Ana Bilim Dalı; AAG-8561-2021; AAI-2318-2021; EWW-9360-2022Publication Rare use of twin solitaire® stents in the double waffle-cone technique for endovascular treatment of a wide-necked bifurcation aneurysm(Sage, 2015-04-01) Nas, Ömer Fatih; Kaçar, Emre; Kaya, Ahmet; Erdoğan, Cüneyt; Hakyemez, Bahattin; NAS, ÖMER FATİH; KAYA, AHMET TUFAN; Erdoğan, Cüneyt; HAKYEMEZ, BAHATTİN; Tıp Fakültesi; Radyoloji Ana Bilim Dalı; 0000-0002-8813-6513; 0000-0002-3425-0740; AAI-2318-2021; AAS-5392-2021; AAG-8561-2021; COE-1124-2022Endovascular treatment of wide-necked bifurcation aneurysms may be challenging. The waffle-cone technique can be used in these aneurysms in case of acute angulation between parent artery and distal artery of the aneurysm. Solitaire (R) stent (Ev3, Irvine, CA, USA) has the significant advantage of mitigating the potential complication risks. This study reports the second case in the literature in which endovascular treatment of a wide-necked bifurcation aneurysm with the double waffle-cone technique by using twin Solitaire (R) stents proved to be successful.Publication 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; Tıp Fakültesi; Radyoloji Ana Bilim 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 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; Tıp Fakültesi; 0000-0002-4467-3915; AAH-6568-2021; AAG-8561-2021; AAG-2372-2021Publication 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; Tıp Fakültesi; Radyoloji Ana Bilim 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 Rare use of Atrieve Vascular Snare™ for percutaneous transcatheter retrieval of central venous port catheter fragments(Elsevier Masson, 2015-11-01) Nas, O. F.; Kaçar, E.; Doğan, N.; Atasoy, M. M.; Erdoğan, C.; NAS, ÖMER FATİH; Erdoğan, Cüneyt; Tıp Fakültesi; Radyoloji Ana Bilim Dalı; AAG-8561-2021; COE-1124-2022Central venous port catheters and peripherally inserted central catheters (PICC lines) are implanted in the central venous system usually for administration of chemotherapeutic agents and parenteral nutrition [1,2]. Long-term use of these catheters may cause such complications as occlusion, thrombosis, infection, fracture and intravascular dislocation of the catheter [2,3]. The incidence of intravascular dislocation of port catheters is rare( 0-3.1%) [1,3]. Fragments of a fractured port catheter might migrate towards the heart or pulmonary artery and cause embolization in the distal region of the organ resulting in mortality [1,4]. Therefore, port catheter fragments must be retrieved as soon as possible[ 1]. Percutaneous retrieval, removal by open thoracotomy and long-term anticoagulant therapy are the treatment options for fractured port catheters. Among these options, percutaneous transcatheter retrieval is usually a safe and effective method [1,5]. In this study, we report the retrieval of port catheter fragments extending from the superior vena cava to the right cardiac cavities using a three-loop 6F 12-20 mm snare( Atrieve Vascular Snare (TM); Angiotech, Gainesville, FL, United States) in two patients who complained of chest pain.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; Tıp Fakültesi; 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 Bilateral perirenal fluid accumulation associated with tetralogy of fallot(Modestum Ltd, 2017-01-01) Sağ, Saim; Nas, Ömer Fatih; Öztürk, Alper; Yeşilbursa, Dilek; Erdoğan, Cüneyt; Sağ, Saim; NAS, ÖMER FATİH; Öztürk, Alper; YEŞİLBURSA, DİLEK; Erdoğan, Cüneyt; Tıp Fakültesi; Radyoloji Ana Bilim Dalı; AAG-8561-2021; AAW-9185-2020; JKP-3323-2023; EHA-0046-2022; COE-1124-2022This report describes a case of spontaneously developing bilateral perirenal fluid accumulation in a patient under monitoring for tetralogy of Fallot. The causal pathophysiology of perirenal fluid accumulation in patients with tetralogy of Fallot is unidentified. As a result of comprehensive examinations we establish that perirenal fluid develops due to high hematocrit. Perirenal fluid did not relapse after repeated phlebotomy treatment. Our case is the first to describe the combination of tetralogy of Fallot and perirenal fluid accumulation in the literature.Publication Spontaneous occlusion of cerebral arteriovenous malformation following partial embolization with onyx(Sage Publications Inc, 2017-02-01) Nas, Ömer Fatih; Öztürk, Kerem; Gokalp, Gökhan; Hakyemez, Bahattin; NAS, ÖMER FATİH; Öztürk, Kerem; GÖKALP, GÖKHAN; HAKYEMEZ, BAHATTİN; Tıp Fakültesi; Radyoloji Ana Bilim Dalı; 0000-0001-9664-2347; AAI-2336-2021; E-1228-2018; AAI-2318-2021; AAG-8561-2021Management options for brain arteriovenous malformations (AVMs) are surgery, radiosurgery, and endovascular embolization. The aim of partial embolization in endovascular treatment is to make total resection possible. However, increased risk of bleeding in partial embolization creates some controversies about treatment options. Spontaneous total occlusion of cerebral AVMs following partial obliteration with embolization agents is a rarely seen condition. We present a case with an AVM vanishing from right posterior cerebral artery which spontaneously occluded following partial embolization with Onyx liquid agent.
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