Yahya ATAYAN

Dr. Yahya ATAYAN

orcid

Research Focus & Metrics

Academic Career Length

11Years (2016-Present)

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

Representative Publications

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21 July 2016 in Case Reports in Gastrointestinal Medicine
Verified
Journal Article
Open access
PDF file
YAYahya ATAYAN
Yahya ATAYAN
YCYasir Furkan Cagin
Yasir Furkan Cagin
MEMehmet Ali Erdogan
Mehmet Ali Erdogan
YBYılmaz Bilgic
Yılmaz Bilgic
RBRemzi Bestas
Remzi Bestas
YSYüksel Seckin
Yüksel Seckin
Background. Foreign bodies in the gastrointestinal tract are important morbid and mortal clinical conditions. Particularly, emergency treatment is required for cutting and drilling bodies. The majority of ingested foreign bodies (80–90%) leave gastrointestinal tract without creating problems. In 10–20% of cases, intervention is absolutely required. Less than 1% of cases need surgery. In this paper, we present a schizophrenia patient who swallowed multiple lighters.Case. A 21-year-old male schizophrenic patient who uses psychotic drugs presented to the emergency department with the complaints of abdominal pain, severe vomiting, and inability to swallow for a week. His physical examination revealed epigastric tenderness. A plain radiograph of the abdomen revealed multiple tiny metallic densities. Gastroscopy was performed. The lighters were not allowing the passage, and some of them had penetrated the gastric mucosa, and bezoars were observed. One lighter was extracted with the help of the polypectomy snare. Other lighters as a bezoar were removed by surgery.Conclusion. Excessive vomiting of swallowed foreign bodies in the etiology of psychotic patients should be kept in mind. Endoscopic therapy can be performed in the early stages in these patients, but in the late stage surgery is inevitable.

15 September 2020 in Turkish Journal of Gastroenterology
Verified
Journal Article
Closed access
MEMehmet Ali Erdogan
Mehmet Ali Erdogan
YCYasir Furkan Cagin
Yasir Furkan Cagin
YAYahya ATAYAN
Yahya ATAYAN
YBYılmaz Bilgiç
Yılmaz Bilgiç
OYOğuzhan Yıldırım
Oğuzhan Yıldırım
MHMURAT HARPUTLUOGLU
MURAT HARPUTLUOGLU
Background/Aims: Although living donor liver transplantation (LDLT) has been accepted as a primary treatment for adults with end-stage liver disease, concerns about donor health have been emerged. As LDLT is technically complex, it creates perioperative morbidity and mortality risk in donors. Biliary complications such as stricture and leakage are seen most frequently in donors after liver transplantation. While some of these complications get treated with conservative approach, endoscopic, surgical, and percutaneous interventions may be required in some others. We aimed to present endoscopic retrograde cholangiography (ERC) results in donors who developed biliary complications after LDLT. Materials and Methods: Between June 2010 and January 2018, a total of 1521 donors (1291 right lobe grafts, 230 left lobe grafts) of patients who underwent LDLT, were retrospectively reviewed. 63 donors who underwent ERC due to biliary complication, were included in the study. Results: Biliary stricture was found in 1.6% (25/1521), biliary leakage in 2.1% (33/1521), and stricture and leakage together in 0.3% (5/1521) donors. Our endoscopic success rates in patients with biliary leakage, biliary stricture, and stricture and leakage were 85% (28/33), 92% (23/25), and 80% (4/5), respectively. Surgical treatment was performed on 12.6% (8/63) donors who failed ERC. Conclusion: We found that ERC is a successful treatment for post-LDLT donors who have biliary complications.

13 October 2025 in Journal of Clinical Medicine
Verified
Journal Article
Open access
PDF file
YAYahya ATAYAN
Yahya ATAYAN
SYServet Yolbas
Servet Yolbas
EBEmin Bodakci
Emin Bodakci
Background and Aim: Rheumatoid arthritis (RA) is a chronic inflammatory polyarthritis of unknown etiology that symmetrically involves the synovial joints and leads to erosive arthritis. However, when inflammation remains uncontrolled, it not only affects the joints but also increases the risk of various systemic complications, particularly cardiovascular diseases, osteoporosis, and malignancies such as lymphoma. Early initiation of disease-modifying antirheumatic drugs (DMARDs) has been shown to yield superior outcomes in terms of both clinical response and the prevention of joint damage. Nevertheless, the development of hepatotoxicity during treatment may necessitate dose adjustments or even modifications of the therapeutic protocol. Our aim in this study was to retrospectively evaluate the changes in liver enzyme levels in RA patients before and during treatment, especially in MTX and combination therapies using MTX, and to evaluate how these abnormalities affect treatment strategies. Materials and Methods/Results: Among the 33 patients included in this study, 15 exhibited elevated liver enzymes prior to treatment, whereas 18 developed hepatic enzyme abnormalities during therapy. Of the 12 patients receiving methotrexate (MTX) monotherapy and the 15 patients using MTX within a combination regimen, a total of 7 patients (21%) continued to present with elevated liver enzymes during follow-up. Among these, 5 patients (19%) were managed successfully by reducing the MTX dose, while MTX therapy had to be completely discontinued in 2 patients (7%). Notably, all 7 patients who required treatment modification due to persistent enzyme elevation belonged to the group with pre-existing liver enzyme abnormalities and were receiving MTX as part of a combination therapy regimen. Conclusions: These findings indicate that hepatotoxicity risk in RA patients can be effectively managed through close laboratory monitoring and timely dose reduction, with treatment discontinuation being required only in rare cases.

30 January 2026 in Turkish Journal of Gastroenterology
Verified
Journal Article
Open access
MKMuhammed Furkan Keser
Muhammed Furkan Keser
YAYahya ATAYAN
Yahya ATAYAN
MDMustafa Duru
Mustafa Duru
AÇAyşe Hafsa Çağın
Ayşe Hafsa Çağın
ZKZeynep Büşra Keser
Zeynep Büşra Keser
YCYasir Furkan Cagin
Yasir Furkan Cagin
Cite this article as: Keser MF, Atayan Y, Duru M, Çağın AH, Keser ZB, Çağın YF. Upadacitinib-induced sepsis resulting in death in crohn’s disease: The first reported case. Turk J Gastroenterol. Published online January 30, 2026. doi:10.5152/tjg.2026.25637.

17 September 2025
Verified
Book
Open access
PDF file
AMAlper Macif
Alper Macif
ABAhmed Ramiz Baykan
Ahmed Ramiz Baykan
GÇGökhan Çoban
Gökhan Çoban
SYSadik Yavuz
Sadik Yavuz
BBBas Bas
Bas Bas
BBBüşra Başkan
Büşra Başkan
1

23 August 2024 in Recent Trends in Pharmacology
Verified
Journal Article
Closed access
YCYasir Furkan Cagin
Yasir Furkan Cagin
IKİhsan Kulaksiz
İhsan Kulaksiz
NVNigar Vardı
Nigar Vardı
HPHakan Parlakpinar
Hakan Parlakpinar
Onural OzhanOnural Ozhan
Onural Ozhan
YAYahya ATAYAN
Yahya ATAYAN
Sepsis causes release of free oxygen radicals that destroy membrane integrity.We evaluated the antioxidant effects of parsley, Petroselinum crispum(Pc), which has been used therapeutically for centuries in Anatolia, using a rat model of sepsis caused by cecal ligation and puncture (CLP).Wistar albino rats were separated into four groups of eight: a sham group with incised and sutured abdomen, a Pc extract(PcE) group was given 2 g/kg parsley extract for 14 days by gastric gavage, a CLP group with sepsis caused by CLP and a PcE + CLP group given parsley extract for 14 days, then made septic by CLP. PcE is given for 14 days and then sepsis is performed by the CLP procedure. The groups were compared in terms of hemogram, biochemical and histological characteristics. It has been proven that the administration of PcE before CLP-induced sepsis increases neutrophil, PLT counts and TAS levels which decrease with sepsis and decreases biochemical changes (BUN, AST, ALT, LDH, TOS, OSI) which increase with sepsis, to have a protective effect on sepsis . In the PcE + CLP group, the severity of intestinal infiltration was decreased significantly compared to the CLP group; epithelial damage was similar to the CLP group. In the PcE + CLP group, the crypt and villus length was greater and the decrease in Paneth cell degranulation intensity was found to be more than for the CLP group; also, the morphology of the cells was similar to the Sham group. PcE exhibit potential for prophylaxis for sepsis.