Oguzhan Ozsay

Dr. Oguzhan Ozsay

orcid

Research Focus & Metrics

Academic Career Length

8Years (2019-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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1 February 2021 in Sao Paulo Medical Journal
Verified
Journal Article
Open access
PDF file
ITIsmail Alper Tarim
Ismail Alper Tarim
MDMurat Derebey
Murat Derebey
GÖGökhan Selçuk Özbalci
Gökhan Selçuk Özbalci
OOOguzhan Ozsay
Oguzhan Ozsay
MYMahmut Arif Yüksek
Mahmut Arif Yüksek
MBMahmut Başoğlu
Mahmut Başoğlu
BACKGROUND: The COVID-19 pandemic has affected healthcare systems worldwide. The effect of the pandemic on emergency general surgery patients remains unknown. OBJECTIVE: To reveal the effects of the COVID-19 pandemic on mortality and morbidity among emergency general surgery cases. DESIGN AND SETTING: Data on patients who were admitted to the emergency department of a tertiary hospital in Samsun, Turkey, and had consultations at the general surgery clinic were analyzed retrospectively. METHODS: Our study included comparative analysis on two groups of patients who received emergency general surgery consultations in our hospital: during the COVID-19 pandemic period (Group 2); and on the same dates one year previously (Group 1). RESULTS: There were 195 patients in Group 1 and 132 in Group 2 (P < 0.001). While 113 (58%) of the patients in Group 1 were women, only 58 (44%) were women in Group 2 (P = 0.013). Considering all types of diagnosis, there was no significant difference between the two groups (P = 0.261). The rates of abscess and delayed abdominal emergency diseases were higher in Group 2: one case (0.5%) versus ten cases (8%); P < 0.001. The morbidity rate was higher in Group 2 than in Group 1: three cases (1.5%) versus nine cases (7%); P = 0.016. CONCLUSIONS: The COVID-19 pandemic has decreased the number of unnecessary nonemergency admissions to the emergency department, but has not delayed patients’ urgent consultations. The pandemic has led surgeons to deal with more complicated cases and greater numbers of complications.

12 September 2021 in Transplant International
Verified
Journal Article
Closed access
PDF file
SYSezai Yilmaz
Sezai Yilmaz
Sami AkbulutSami Akbulut
Sami Akbulut
SUSertac Usta
Sertac Usta
OOOguzhan Ozsay
Oguzhan Ozsay
TSTEVFIK TOLGA SAHIN
TEVFIK TOLGA SAHIN
MHMURAT HARPUTLUOGLU
MURAT HARPUTLUOGLU
This study aimed to demonstrate the efficacy of our dignostic and therapeutic management algorithm and catheter-assisted (percutaneous transhepatic biliary tract drainage [PTBD] or transanastomotic feeding tube) hepaticojejunostomy (HJ) procedures in living liver donors (LLDs) with biliary complications. Living donor hepatectomy (LDH) was performed between September 2005 and April 2021 in 2489 LLDs. Biliary complications developed in 220 LLDs (8.8%), 136 of which were male, and the median age was 29 (interquartile range [IQR]: 12) years. Endoscopic sphincterotomy ± stenting was performed in 132 LLDs, which was unsuccessful in 9 LLDs and required HJ. Overall, 142 LLDs underwent interventional radiologic procedures. Fifteen LLDs with biliary complications underwent HJ (PTBD catheter=6 and transanastomotic feeding tube=9) at a median of 44 days (IQR: 82). Following HJ, 14 LLDs did not have any complications throughout the median follow-up period of 1619 days (IQR: 1454). However, percutaneous dilation for HJ anastomotic stricture was performed in one patient. Biliary complications are very common following LDH; therefore, surgeons in the field should have a low threshold to perform HJ for biliary complications that persist after other treatments. Our catheter-assisted HJ techniques demonstrated a high success rate and aided HJ in a hostile abdomen during revisional surgery.

15 February 2022 in Turkish Journal of Gastroenterology
Verified
Journal Article
Closed access
OOOguzhan Ozsay
Oguzhan Ozsay
MAMehmet Can Aydın
Mehmet Can Aydın
Background: Surgeons continue to be concerned about complications after pancreaticoduodenectomy, especially postoperative pancreatic fistula. Among the factors that cause postoperative pancreatic fistula, the pancreaticojejunostomy technique has stood out in recent studies. In this study, we aimed to compare the surgical outcomes, especially POPF, of the modified Blumgart and the traditional anastomosis techniques in patients who underwent pancreaticoduodenectomy. Methods: A total of 144 patients who underwent pancreaticoduodenectomy were divided into 2 groups according to the performed pancreaticojejunostomy technique (modified Blumgart anastomosis, n = 91 and traditional anastomosis, n = 53). Preoperative clinicodemographic data, perioperative findings, and postoperative results were compared between the groups. Additionally, factors associated with clinically relevant postoperative pancreatic fistula were analyzed. Results: The modified Blumgart anastomosis group had lower clinically relevant postoperative pancreatic fistula rate than traditional anastomosis group (n = 8 (8.8%) versus n = 14 (26.4%), P = .005). On the contrary, the biochemical leakage rate was higher in the modified Blumgart anastomosis group (n = 30 (33%) versus n = 9 (17%), P = .037). While postoperative pancreatic fistula-related reoperation rate was lower (n = 2 (2.2%) versus n = 7 (13.2%), P = .013), the length of hospital stay was also shorter (11 days (5-47 days) versus 21 days (6-46 days), P < .001) in the modified Blumgart anastomosis group. Univariate and multivariate analyses revealed that modified Blumgart anastomosis was an independent and negative predictive factor for clinically relevant postoperative pancreatic fistula (odds ratio = 0.274, 95% confidence interval = 0.103-0.728, P = .009). Conclusion: Compared to the traditional anastomosis, modified Blumgart anastomosis decreases the rate of transition from biochemical leakage to clinically relevant postoperative pancreatic fistula and postoperative pancreatic fistula-related reoperation and also shortens the length of hospital stay. In addition, modified Blumgart anastomosis is an independent and negative predictive factor for the development of clinically relevant postoperative pancreatic fistula.

14 July 2021 in International Journal Of Clinical Practice
Verified
Journal Article
Closed access
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YUYasemin Burcu Ustun
Yasemin Burcu Ustun
EKErsin Koksal
Ersin Koksal
ETEsra Turunc
Esra Turunc
OKOZGUR KOMURCU
OZGUR KOMURCU
Burhan DostBurhan Dost
Burhan Dost
KKKagan Karabulut
Kagan Karabulut
Background Dexmedetomidine is a potent and highly selective alpha-2 adrenoceptor agonist with sympatholytic, sedative, anxiolytic and analgesic properties. The aim of this study is to determine the effect of a dexmedetomidine infusion in liver transplant recipients in the early postoperative period on early and smooth extubation. Methods We performed a retrospective chart review of 21 patients undergoing liver transplantation between December 1, 2018 and February 31, 2020. Patients were divided into the dexmedetomidine and midazolam groups. The primary outcome was the extubation time. Secondary outcomes were mean arterial pressure and heart rate before and after extubation. The collected data included the patients’ age, gender, surgery time, Model for End-stage Liver Disease score, cold ischemia time, blood transfusion amount and extubation visual analogue scale (VAS) scores. Results Extubation time was significantly shorter in the dexmedetomidine group than in the midazolam group (median [minimum-maximum], 4 [0-6], 8 [4-13] hours, respectively, P = .000). Extubation VAS scores were statistically significantly lower in dexmedetomidine group (P = .000). Mean arterial pressure values before and after extubation were significantly higher in patients' midazolam group than the dexmedetomidine group (P = .003, P = .005, respectively). Conclusions Dexmedetomidine infusions provided early and smooth extubation with stable haemodynamics in our patients.

6 October 2023 in Acta Chirurgica Belgica
Verified
Journal Article
Closed access
OOOguzhan Ozsay
Oguzhan Ozsay
MAMehmet Can Aydin
Mehmet Can Aydin
KKKagan Karabulut
Kagan Karabulut
MBMahmut Basoglu
Mahmut Basoglu
ODOsman Nuri Dilek
Osman Nuri Dilek
BackgroundSuperior mesenteric/portal vein reconstruction (SMPVR) thrombosis remains a challenging complication following pancreaticoduodenectomy concomitant with venous resection. In this context, we aimed to present our SMPVR experiences and identify potential clinicopathological factors that increased SMPVR thrombosis.MethodsA total of 33 patients who underwent SMPVR during pancreaticoduodenectomy were analyzed. Of these, 26 patients who experienced pancreatic head ductal adenocarcinoma met our inclusion criteria. Patients' data were compared as classified by SMPVR type and the development of SMPVR thrombosis. All interposition grafts were Dacron in this cohort.ResultsTypes of SMPVR included: tangential resection with primary repair (n = 12); segmental resection with splenic vein preservation and either primary anastomosis (n = 8) or 14 mm tubular Dacron grafting (n = 1); segmental resection with splenic vein division either 14 mm tubular Dacron grafting (n = 2) or 14/7 mm 'Y'-shaped Dacron grafting (n = 3). A total of four patients having 14/7 mm 'Y'-shaped (n = 3) and 14 mm tubular Dacron (n = 1) developed SMPVR thrombosis (p = .001). Dacron grafting (p = .001) and splenic vein division (p = .010) were associated with SMPVR thrombosis. The median time to detection of SMPVR thrombosis was 4.3 months (2.5-21.0 months). The median follow-up time was 12.2 months (3.0-45 months).ConclusionsDuring pancreaticoduodenectomy for pancreatic head ductal carcinoma, extended venous resection requiring SMPVR with 'Y'-shaped and use of Dacron interposition grafts appeared to be associated with the development of SMPVR thrombosis. This result warrants further investigations.

31 January 2025 in Turkish Journal of Gastroenterology
Verified
Journal Article
Open access
MAMehmet Can Aydin
Mehmet Can Aydin
OOOguzhan Ozsay
Oguzhan Ozsay
KKKagan Karabulut
Kagan Karabulut
RBRecep Bircan
Recep Bircan
FAFatih Atalay
Fatih Atalay
MOMehmet Batuhan Ors
Mehmet Batuhan Ors
Background/Aims: Postoperative pancreatic fistula (POPF), which is considered the most frightening complication after pancreatic oduodenectomy (PD), continues to be a serious problem even in experienced centers. In the present study, we aimed to determine the risk factors that increase the progression from biochemical leak (BL) to clinically relevant postoperative pancreatic fistula (CR-POPF) after PD. Materials and Methods: We retrospectively analyzed the data of 152 patients who underwent PD. A total of 71 patients who developed POPF were included in the study and divided into two groups: 52 patients remained in the BL stage and 19 patients progressed from BL to CR-POPF. The groups were compared in terms of preoperative data, perioperative findings, and postoperative results. Risk factors for progression from BL to CR-POPF were analyzed. Results: Preoperative prognostic nutritional index (PNI) was significantly lower in the CR-POPF group compared to the BL group (35.6 (30.1-47.9) vs 41.6 (33.5-58), P < .001). Receiver operating characteristic (ROC) curve analysis showed that the best cutoff of preoperative PNI value for predicting this progression was 38 (AUC = 0.835; 95% CI, 0.717-0.953; P = .001). While the progression rate was 58.3% in the group with PNI < 38, it was 10.6% with PNI ≥ 38. In univariate and multivariate analysis, preoperative PNI value was the only independent risk factor for progression from BL to CR-POPF after PD (OR, 15.428; 95% CI, 3.714-64.085; P < .01). Conclusion: Preoperative PNI value is an important parameter predicting the progression from BL to CR-POPF after PD. Cite this article as: Can Aydin M, Ozsay O, Karabulut K, Bircan R, Atalay F, Batuhan Ors M. Progression from biochemical leak to clinically relevant postoperative pancreatic fistula after pancreaticoduodenectomy. The key of the lock: prognostic nutritional index. Turk J Gastroenterol. 2025;36(2):100-106.