Bahadır Kartal

Dr. Bahadır Kartal


Research Focus & Metrics

Academic Career Length

5Years (2022-Present)

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

Representative Publications

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17 December 2025 in Medicina
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EAErtuğrul Gazi Alkurt
Ertuğrul Gazi Alkurt
MAMert Yigit Akdogan
Mert Yigit Akdogan
MTMehmet Berksun Tutan
Mehmet Berksun Tutan
BKBahadır Kartal
Bahadır Kartal
VTVeysel Barış Turhan
Veysel Barış Turhan
Background and Objectives: Anastomotic leakage (AL) is a major complication following sphincter-preserving surgeries for left-sided colorectal cancer. In this study, we aimed to evaluate the association between circular stapler diameter and the risk of AL. As a secondary objective, we investigated whether preoperative serum protein levels were associated with leakage development. Materials and Methods: We conducted a retrospective case–control study including 99 patients who underwent elective colorectal surgery with stapled anastomosis for left-sided colorectal cancer between January 2020 and May 2024. A total of 99 patients were included (60.6% male), with a mean age of 66.1 ± 10.7 years. The patients were categorized into small (≤29 mm) and large (≥30 mm) stapler groups. Demographic, clinical, and laboratory variables were collected. Anastomotic leakage was defined as an International Study Group of Rectal Cancer (ISREC) Grade B or C leak requiring intervention. Univariate analyses and multivariate logistic regression analyses were performed, and results were reported as odds ratios (ORs) with 95% confidence intervals (CIs). A STROBE-compliant flow diagram was prepared. Results: Anastomotic leakage occurred in 10 patients (10.1%), and leakage rates were not significantly different between stapler-size groups (≤29 mm: 10.9% vs. ≥30 mm: 7.5%, p = 0.365). In multivariate analysis, stapler size was not independently associated with leakage (OR 1.68, 95% CI 0.40–6.97, p = 0.480). Lower preoperative serum protein levels were identified as the only independent predictor of leakage (OR 0.28, 95% CI 0.10–0.74, p = 0.011). Postoperative hospital stay was significantly longer for patients with leakage (median 17 vs. 7 days, p < 0.001). Conclusions: We found no significant associations between circular stapler diameter and anastomotic leakage in left-sided colorectal cancer surgery. Conversely, low serum protein levels were independently associated with increased leakage risk, highlighting the importance of preoperative nutritional assessment. Given the retrospective design, small number of leakage cases, and unmeasured confounders, these findings should be interpreted with caution. Further multicenter, prospective studies should be conducted to clarify the influence of stapler size and patient-related factors on anastomotic outcomes.

1 May 2022
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Journal Article
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BKBahadır Kartal
Bahadır Kartal
ADAhmet Cem Dural
Ahmet Cem Dural
HAHusnu Aydin
Husnu Aydin
NSNuri Alper Sahbaz
Nuri Alper Sahbaz
DGDeniz Guzey
Deniz Guzey
MKMehmet Karabulut
Mehmet Karabulut

31 August 2023 in Cureus
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BKBahadır Kartal
Bahadır Kartal
ISIbrahim Tayfun Sahiner Sr.
Ibrahim Tayfun Sahiner Sr.
Introduction Irritable bowel syndrome (IBS) is a common functional gastrointestinal disorder characterized by persistent abdominal pain and variable bowel patterns, impacting individuals' quality of life. Despite its functional nature, recent research has indicated the role of inflammatory processes in IBS development. This study aims to investigate the potential diagnostic value of routine blood parameters and their relationship with IBS. Methods In this retrospective analysis, patients diagnosed with IBS based on the ROME IV criteria were identified from the outpatient clinic of Hitit University Erol Olçok Teaching and Research Hospital between January 1, 2023, and May 1, 2023. Exclusion criteria encompassed specific medical conditions, psychiatric disorders, and organic bowel pathologies. A cohort of 100 IBS patients and 100 healthy controls were included for comparison. Comprehensive blood data, including neutrophil count, lymphocyte count, hemoglobin level, red cell distribution width (RDW), mean corpuscular volume (MCV), mean platelet volume (MPV), and platelet count, were collected. Statistical analyses were conducted using SPSS for Windows version 26.0 (IBM Corp., Armonk, NY). Descriptive statistics, Pearson's or Spearman's correlation coefficients, Mann-Whitney U test, and Chi-square test were used to analyze data. Results The study cohort consisted of 70 men (35%) and 130 women (65%). The average age was 51.65 ± 14.64 years (52 years). The mean neutrophil count was 4.6 ± 1.5 (4.29) in the control group and 4.7 ± 2.03 (4.12) in the IBS group. The mean lymphocyte count was 2.3 ± 0.86 (2.21) in the control group and 2.3 ± 0.82 (2.23) in the IBS group, indicating no statistically significant difference (p = 0.732). The mean RDW was measured as 13.62 ± 1.07 (13.4) in the control group and 13.68 ± 1.18 (13.55) in the IBS group, again demonstrating no significant difference (p = 0.915). Mean MCV and MPV values showed no substantial variation between the control and IBS groups (p = 0.649 and p = 0.406, respectively). Conclusion While this study did not yield statistically robust outcomes, it underscores the potential of utilizing neutrophil-to-lymphocyte ratio (NLR), RDW, and MPV as adjunctive diagnostic markers for IBS. These routine and cost-effective parameters could enhance the diagnostic process, especially in cases with suspected IBS. Continued research is essential to unravel their complete diagnostic potential and clinical applicability.

27 March 2025 in Medicina
Verified
Journal Article
Open access
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VTVeysel Barış Turhan
Veysel Barış Turhan
OKOnur Karacif
Onur Karacif
MTMehmet Berksun Tutan
Mehmet Berksun Tutan
BKBahadır Kartal
Bahadır Kartal
FŞFatih Şahin
Fatih Şahin
EAErtuğrul Gazi Alkurt
Ertuğrul Gazi Alkurt
Background and Objectives: Anastomotic leakage (AL) is a major complication of colorectal surgery (CRS), increasing morbidity, mortality, and healthcare costs. While several AL risk factors have been identified, the role of aortic calcification (AC) remains unclear. As a marker of systemic atherosclerosis, AC may impair tissue perfusion and anastomotic healing. Additionally, tumor factors (TNM stage, histology, and localization) and patient comorbidities (hypertension, cardiovascular disease, and neoadjuvant therapy) may contribute to AL risk. This study evaluates the association between preoperative AC and AL incidence while considering additional risk factors. Materials and Methods: This retrospective cohort study included 151 patients undergoing CRS from January 2020 to October 2023. Preoperative CT scans classified AC into Stage 0 (none), Stage 1 (50%) of the aortic circumference. Data on demographics, tumor characteristics, neoadjuvant therapy, and comorbidities were collected. AL risk factors were analyzed using univariate and multivariate logistic regression. Results: AL occurred in 5.96% (9/151) of patients. AL incidence was significantly higher in patients with >50% AC (44.47% vs. 11.27%, p = 0.012). Multivariate analysis confirmed AC as an independent AL predictor (OR = 10.38, 95% CI: 1.243–92.118, p = 0.032). Rectal tumor localization (p = 0.038), hypertension (p = 0.027), cardiovascular disease (p = 0.014), and neoadjuvant therapy (p = 0.045) were also associated with increased AL risk. Conclusions: Severe AC is an independent predictor of AL in CRS. Additionally, rectal tumors, hypertension, cardiovascular disease, and neoadjuvant therapy contribute to AL risk. Preoperative vascular assessments and comprehensive risk stratification models may help identify high-risk patients and guide perioperative management strategies to reduce AL incidence.

1 February 2023 in Journal of Surgery and Medicine
Verified
Journal Article
Open access
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EAErtuğrul Gazi Alkurt
Ertuğrul Gazi Alkurt
BKBahadır Kartal
Bahadır Kartal
MTMehmet Berksun Tutan
Mehmet Berksun Tutan
ALAzmi LALE
Azmi LALE
EAErhan Aygen
Erhan Aygen
Background/Aim: Lymphovascular and perineural invasion (LVI and PNI, respectively) are associated with poor prognosis in various cancers. We sought to identify clinical variables associated with LVI and PNI in colorectal cancer (CRC) and their effects on survival. Methods: Our study design is consistent with a retrospective cohort study. Data from 237 patients with documented LVI or PNI who underwent surgery for colorectal cancer between 2017 and 2021 were retrospectively reviewed. Demographic characteristics, surgery and pathology reports, disease-free and overall survival (DFS and OS, respectively) of the patients were examined. Results: When the DFS duration of the patients were evaluated, The mean DFS of the LVI-negative group was 27.4 (15.09) months, and the mean of the LVI-positive patients was 20.45 (13) months. DFS was longer in the LVI-negative group (P<0.001). DFS was 52.26 (1.89) months in PNI-negative patients and 34.29 (2.71) months in PNI-positive patients. DFS expectation of PNI-positive patients was approximately 18 months less than that of negative patients (P<0.001). When the patients were evaluated in terms of OS duration, no significant difference was observed in LVI-negative and -positive patient groups, while the estimated OS duration was 52.29 (1.84) months in PNI-negative patients, and 40.10 (2.49) months in PNI-positive patients. OS was 12 months shorter in PNI-negative patients (P<0.001). Conclusion: The use of PNI and LVI together was found to have a significant impact on the survival rates of patients with colorectal cancer. Documenting LVI and PNI status in biopsy specimens can aid in the management, prognosis, and decision-making for treating colorectal tumors. function ready(callback){ // in case the document is already rendered if (document.readyState!='loading') callback(); // modern browsers else if (document.addEventListener) document.addEventListener('DOMContentLoaded', callback); // IE <= 8 else document.attachEvent('onreadystatechange', function(){ if (document.readyState=='complete') callback(); }); } ready(function(){ var abstract = document.getElementById("abstract"); //declare your possible strings in vars let st = innerHTML; st = st.replace(//g,""); st = st.replace(/<\/p>/g,""); st = st.replace(//g,""); st = st.replace(/<\/strong>/g,""); st = st.replace(/ /g,""); let title = "Background/Aim:"; if(st.includes(title)){ st = st.replace(title, ""+title+" "); } else{ title = "Aim:"; st = st.replace(title, ""+title+""); } let titles = ["Methods:", "Conclusion:", "Results:"]; titles.forEach((title, ndx) => { //console.log(title); st = st.replace(title, " "+title+""); }); //console.log(st); innerHTML = ''+st+''; }); Downloads Download data is not yet available. 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Prognostic factors in colorectal cancer. College of American Pathologists Consensus Statement 1999. Arch Pathol Lab Med. 2000 Jul;124(7):979-94. DOI: https://doi.org/10.5858/2000-124-0979-PFICC Liebig C, Ayala G, Wilks J, Verstovsek G, Liu H, Agarwal N, et al. Perineural invasion is an independent predictor of outcome in colorectal cancer. J Clin Oncol. 2009; 27(31): 5131 DOI: https://doi.org/10.1200/JCO.2009.22.4949 Harris EI, Lewin DN, Wang HL, Lauwers GY, Srivastava A, Shyr Y, et al. Lymphovascular invasion in colorectal cancer: an interobserver variability study. Am J Surg Pathol.2008;32:1816–21. DOI: https://doi.org/10.1097/PAS.0b013e3181816083 Yuan H, Dong Q, Zheng B, Hu X, Xu JB, Tu S. Lymphovascular invasion is a high risk factor for stage I/II colorectal cancer: a systematic review and meta-analysis. Oncotarget 2017;8:46565–79. DOI: https://doi.org/10.18632/oncotarget.15425 Lim SB, Yu CS, Jang SJ, Kim TW, Kim JH, Kim JC. Prognostic significance of lymphovascular invasion in sporadic colorectal cancer. Dis Colon Rectum.2010;53:377–84. DOI: https://doi.org/10.1007/DCR.0b013e3181cf8ae5 Beard CJ, Chen MH, Cote K. Loffredo M, Renshaw AA, Hurwitz M, et al. Perineural invasion is associated with increased relapse after external beam radiotherapy for men with low-risk prostate cancer and may be a marker for occult, high-grade cancer. Int J Radiat Oncol Biol Phys. 2004;58:19–24. DOI: https://doi.org/10.1016/S0360-3016(03)01433-0 Harnden P, Shelley MD, Clements H, Coles B, Tyndale‐Biscoe RS, Naylor B, et al. The prognostic significance of perineural invasion in prostatic cancer biopsies: a systematic review. Cancer-Am Cancer Soc. 2007;109:13–24. DOI: https://doi.org/10.1002/cncr.22388 Mendenhall WM, Amdur RJ, Hinerman RW, Werning JW, Malyapa RS, Villaret, et al. Skin cancer of the head and neck with perineural invasion. Am J Clin Oncol. 2007;30:93–96. DOI: https://doi.org/10.1097/01.coc.0000251224.16075.60 Peng J, Lu JJ, Zhu J, Xu Y, Lu H, Lian P, Cai G, Cai S. Prediction of treatment outcome by CD44v6 after total mesorectal excision in locally advanced rectal cancer. Cancer J. 2008 Jan-Feb;14(1):54-61. doi: 10.1097/PPO.0b013e3181629a67. PMID: 18303484 DOI: https://doi.org/10.1097/PPO.0b013e3181629a67 Matsushima T, Mori M, Kido A, Adachi Y, Sugimachi K. Preoperative estimation of neural invasion in rectal carcinoma. Oncol Rep. 1998; 5(1):73-9. DOI: https://doi.org/10.3892/or.5.1.73 Knijn N, Mogk SC, Teerenstra S, Simmer F, Nagtegaal ID. Perineural Invasion is a Strong Prognostic Factor in Colorectal Cancer: A Systematic Review. Am J Surg Pathol. 2016 Jan;40(1):103-12. DOI: https://doi.org/10.1097/PAS.0000000000000518 Sun Q, Liu T, Liu P, Luo J, Zhang N, et al. Perineural and lymphovascular invasion predicts for poor prognosis in locally advanced rectal cancer after neoadjuvant chemoradiotherapy and surgery. J Cancer. 2019 May 21;10(10):2243-9. DOI: https://doi.org/10.7150/jca.31473 Hoda SA, Hoda RS, Merlin S, Shamonki J, Rivera M. Issues relating to lymphovascular invasion in breast carcinoma. Adv Anat Pathol. 2006;13:308–15. DOI: https://doi.org/10.1097/01.pap.0000213048.69564.26 Lim TY, Pavlidis P, Gulati S, Pirani T, Samaan M, Chung-Faye G, et al. Vedolizumab in Inflammatory Bowel Disease Associated with Autoimmune Liver Disease Pre- and Postliver Transplantation: A Case Series. Inflamm Bowel Dis. 2016;22:39–40. DOI: https://doi.org/10.1097/MIB.0000000000000906 Huh JW, Lee JH, Kim HR, Kim YJ. Prognostic significance of lymphovascular or perineural invasion in patients with locally advanced colorectal cancer. Am J Surg. 2013;206:758–763 DOI: https://doi.org/10.1016/j.amjsurg.2013.02.010 Zhong JW, Yang SX, Chen RP, Zhou YH, Ye MS, Miao L, et al. Prognostic Value of Lymphovascular Invasion in Patients with Stage III Colorectal Cancer: A Retrospective Study. Med Sci Monit. 2019;25:6043–50. DOI: https://doi.org/10.12659/MSM.918133 Yüksel C, Çulcu S, Gojayev A, Demirci S, Ünal A. E. Prognostic Value of Lymphovascular and Perineural Invasion in Colon Cancer. Acta Oncologica Turcica, 2021;54(2):166-74. DOI: https://doi.org/10.5505/aot.2021.23540 Sibio S, Di Giorgio A, D'Ugo S, Palmieri G, Cinelli L, Formica V, et al. Histotype influences emergency presentation and prognosis in colon cancer surgery. Langenbecks Arch Surg. 2019 Nov;404(7):841-51. DOI: https://doi.org/10.1007/s00423-019-01826-6 Nakamura Y, Hokuto D, Koyama F, Matsuo Y, Nomi T, Yoshikawa T, et al. The Prognosis and Recurrence Pattern of Right- and Left-Sided Colon Cancer in Stage II, Stage III, and Liver Metastasis After Curative Resection. Ann Coloproctol. 2021 Oct;37(5):326-36. DOI: https://doi.org/10.3393/ac.2020.09.14 Osterman E, Mezheyeuski A, Sjöblom T, Glimelius B. Beyond the NCCN Risk Factors in Colon Cancer: An Evaluation in a Swedish Population-Based Cohort. Ann Surg Oncol. 2020 Apr;27(4):1036-45. DOI: https://doi.org/10.1245/s10434-019-08148-3 Zhang C, Yin S, Tan Y, Huang J, Wang P, Hou W, et al. Patient Selection for Adjuvant Chemotherapy in High-Risk Stage II Colon Cancer: A Systematic Review and Meta-Analysis. Am J Clin Oncol. 2020 Apr;43(4):279-87. DOI: https://doi.org/10.1097/COC.0000000000000663 <!-- .main_entry --> Downloads PDF 148 273 Published 2023-02-03 Issue Vol. 7 No. 2 (2023): 138-143 Section Research Article How to Cite 1. Alkurt EG, Kartal B, Tutan MB, Lale A, Aygen E. Prognostic value of lymphovascular and perineural invasion in colorectal cancer: Lymphovascular and perineural invasion in colorectal cancer. J Surg Med [Internet]. 2023 Feb. 3 [cited 2023 Dec. 5];7(2):138-43. Available from: https://jsurgmed.com/article/view/7561 More Citation Formats ACM ACS APA ABNT Chicago Harvard IEEE MLA Turabian Vancouver Download Citation Endnote/Zotero/Mendeley (RIS) BibTeX License Copyright (c) 2023 Ertuğrul Gazi Alkurt, Bahadır Kartal, Mehmet Berksun Tutan; Azmi Lale; Erhan Aygen This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License. Citations <!-- AddThis Button BEGIN --> <!-- AddThis Button END --> #7561 <!-- .entry_details -->

14 October 2024 in Hitit Medical Journal
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Journal Article
Open access
BKBahadır Kartal
Bahadır Kartal
MTMehmet Berksun Tutan
Mehmet Berksun Tutan
FŞFatih Şahin
Fatih Şahin
EAErtuğrul Gazi Alkurt
Ertuğrul Gazi Alkurt
Objective: Gastric cancer surgery, including curative and palliative procedures, is crucial for managing gastric cancer. Accurate assessment of nutritional status is essential for risk stratification and improving patient outcomes. This retrospective study aims to identify the most reliable predictors of postoperative mortality by investigating the correlation between four nutritional scores and the mortality rate following gastric cancer surgery. Material and Method: This retrospective study evaluated 50 patients diagnosed with gastric adenocarcinoma and operated on at Hitit University Department of General Surgery between April 2021 and September 2023. Nutritional scores were calculated using albumin, cholesterol, neutrophil-to-lymphocyte ratio, and lymphocyte-to-monocyte ratio, along with mortality rates. Data collected included age, gender, operation type, laparoscopy usage, albumin, cholesterol, neutrophil-to-lymphocyte ratio, lymphocyte-to-monocyte ratio, mortality rates, and TNM stages. Nutritional scores were calculated, and their predictive accuracy for mortality was assessed using time-dependent Receiver Operating Characteristic curve analysis. Results: Significant differences in albumin levels, neutrophil-to-lymphocyte ratio, lymphocyte-to-monocyte ratio, and nutritional scores were found between deceased and surviving patients. Specifically, albumin levels were significantly lower in deceased patients (median = 3.5 mg/dL) compared to surviving patients (median = 4.1 mg/ dL, p=0.001). The median neutrophil-to-lymphocyte ratio was higher in deceased patients (p=0.005), and the median lymphocyte-to-monocyte ratio was lower in deceased patients (p=0.009). Among the scores, the Naples Prognostic Score was significantly associated with mortality but was outperformed by the Prognostic Nutritional Index. The Prognostic Nutritional Index had the highest predictive accuracy with an Area Under the curve of 0.792, a sensitivity of 76%, and a specificity of 86.2%, outperforming the others. Conclusion: Among the evaluated scores, the Prognostic Nutritional Index is the most effective predictor of prognosis. Its superior predictive accuracy suggests that the PNI can be utilized to enhance risk assessment and guide nutritional interventions in gastric cancer patients undergoing surgery.