Necdet Yaşar

Dr. Necdet Yaşar

orcid

Research Focus & Metrics

Academic Career Length

12Years (2015-Present)

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

Representative Publications

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12 September 2017 in Molecules
Verified
Journal Article
Open access
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NYNecdet Yaşar
Necdet Yaşar
BBBartu Badak
Bartu Badak
ACAğgül Canik
Ağgül Canik
SBSema Şanal Baş
Sema Şanal Baş
SUSema Uslu
Sema Uslu
EAErsin Ateş
Ersin Ateş
Disruption of nocturnal sleep in an intensive care unit may remarkably affect production of melatonin, which is also known to have anti-inflammatory properties. In the present study, we aimed to investigate the effect of sleep quality on melatonin levels and inflammation after surgery. Thus, we compared the patients, who were screened in the side-rooms where the lights were dimmed and noise levels were reduced, with the patients who received usual care. Preoperative and postoperative urine 6-sulphatoxymelatonin, serum interleukin-1 (IL-1), interleukin-6 (IL-6), and c-reactive protein (CRP) levels were measured and data on sleep quality was collected using the Richards–Campbell Sleep Questionnaire. Postoperative CRP and IL-6 levels were greater in the control group than in the experimental group, whereas postoperative 24 h melatonin levels were greater than preoperative levels and the difference was steeper in the experimental group in concordance with sleep quality scores. Thus, the regulation of light and noise in ICUs may help the recovery after major surgeries in patients, potentially by increasing melatonin production, which has anti-inflammatory properties.

28 September 2018 in Turkish Journal of Surgery
Verified
Journal Article
Open access
SYSinan Yol
Sinan Yol
EPErdal Polat
Erdal Polat
MDMustafa Duman
Mustafa Duman
OUOrhan Uzun
Orhan Uzun
NYNecdet Yaşar
Necdet Yaşar
SKSibel Kayahan
Sibel Kayahan
Extragastrointestinal stromal tumors that arise in the pancreas are extremely rare and managing them can be difficult, particularly if located in the head of pancreas. This case report aims to contribute to the existing data in the literature regarding extragastrointestinal stromal tumors with rare and unusual locations. We present a 56-year-old man who presented with recurrent mild right upper quadrant abdominal pain. Abdominal computed tomography and magnetic resonance imaging revealed a mass lesion with a diameter of 10 cm localized in the head of pancreas. Pancreaticoduodenectomy with complete tumor excision was performed. He was discharged on the postoperative day 14. Only 15 extragastrointestinal stromal tumors cases have been reported. Of these 15 cases, tumors were located in the head of pancreas in six cases. Here we report the seventh case of pancreatic extragastrointestinal stromal tumor arising in the head of pancreas and also the largest of these seven tumors.

30 August 2021 in TURKISH JOURNAL OF MEDICAL SCIENCES
Verified
Journal Article
Open access
MKMuhammed Kandemi̇r
Muhammed Kandemi̇r
NYNecdet Yaşar
Necdet Yaşar
MÖMete Özkurt
Mete Özkurt
RÖRumeysa Özyurt
Rumeysa Özyurt
NANuriye Ezgi Bektur Aykanat
Nuriye Ezgi Bektur Aykanat
NENilüfer Erkasap
Nilüfer Erkasap
Even though interleukin-1 receptor antagonist, IL-1Ra, is used in certain inflammatory diseases, its effect on ischemia-reperfusion injury is a current research topic. We aimed to investigate the protective effects of anakinra, an IL-1Ra, on the I/R induced intestinal injury. The rat model of intestinal ischemia-reperfusion was induced. Rats were randomized into four groups: (group 1) control group, (group 2) I/R group, (group 3 and 4) treatment groups (50mg/kg and 100mg/kg, respectively). Gene expressions of Caspase-3, TNF-?, IL-1?, IL-6, and apoptotic cells in tissue samples were evaluated by PCR and TUNEL methods, respectively. Plasma levels of SOD, CAT, and MDA were studied by the ELISA method and tissue samples were examined histopathologically as well. Anakinra inhibited the expression of IL-1?, IL-6, and TNF-? and decreased the SOD, CAT, and MDA caused by ischemia-reperfusion injury in both treatment groups. Caspase-3 expression and TUNEL-positive cell number in treatment groups as well were less. Histopathologically, anakinra better preserved the villous structure of the small intestine at a dose of 100 mg/kg than 50 mg/kg. Anakinra decreased the intestinal damage caused by ischemia-reperfusion and a dose of 100mg/kg was found to be histopathologically more effective.

1 January 2017 in Turkish Journal of Trauma and Emergency Surgery
Verified
Journal Article
Open access
NYNecdet Yaşar
Necdet Yaşar
This study compared the predictive accuracy of four scoring systems, namely Acute Physiology and Chronic Health Evaluation II (APACHE II), Sequential Organ Failure Assessment (SOFA), Simplified Acute Physiology Score II (SAPS II), and Mortality in Emergency Department (MEDS), for estimating prognosis in patients with necrotizing fasciitis. Seventy-four patients who presented with necrotizing fasciitis were retrospectively examined. The ability of the scoring systems to predict mortality was assessed by comparing the estimated mortality rates in mortality groups (survivors/non-survivors), and mortality rates among survivors and non-survivors with an estimated mortality of >10%, 30%, and 50% in the scoring systems were compared in pairs. Estimated mortality rates in the survivor and non-survivor groups were different for all the scoring systems. The estimated mortality rates of APACHE II and SAPS II were much closer to the actual mortality rates than the other two scoring systems. When the predicted mortality rates were analyzed as limits for a mortality risk, the predicted mortality rate by APACHE II was superior to that by SAPS II. The studied scoring systems had significantly higher predicted mortality rates in non-survivors than in survivors; however, they all underestimated the mortality rate. APACHE II and SAPS II were relatively superior for estimating mortality in patients with necrotizing fasciitis. APACHE II rather than the other scoring systems should be currently used.

8 March 2024 in Colorectal Disease
Verified
Journal Article
Open access
NYNecdet Yaşar
Necdet Yaşar
WWWeam Waked
Weam Waked
ASAlessandro Sturiale
Alessandro Sturiale
BFBernardina Fabiani
Bernardina Fabiani
GNGabriele Naldini
Gabriele Naldini
Aim: The development of robotic assistance has made dissection and suturing in the deep pelvis much easier. The augmented quality of the images and the articulation of the robotic arms have also enabled a more precise dissection. The aim of this study is to present the data on robotic‐assisted ventral mesh rectopexy procedures in a university hospital and examine the literature in terms of mesh erosion.Method: The electronic databases Pubmed, Embase and Cochrane were searched. Studies from January 2004 until January 2023 in the English language were included. Studies which included fewer than 10 patients were excluded. Laparoscopic or robotic‐assisted ventral mesh rectopexies were included. Mesh erosion rates following laparoscopic or robotic‐assisted ventral mesh rectopexies were measured.Results: Overall, the systematic review presents 5911 patients from 43 studies who underwent laparoscopic ventral mesh rectopexy compared with 746 patients treated with robotic‐assisted ventral mesh rectopexy from six studies and our centre. Mesh erosion was rare in both groups; however, the prevalence was greater in the laparoscopy group (0.90% vs. 0.27%).Conclusion: The mesh erosion rates are very low with robotic‐assisted ventral mesh rectopexy. For precise results, more studies and experience in robotic surgery are required.

19 January 2024 in Medicine
Verified
Journal Article
Open access
NYNecdet Yaşar
Necdet Yaşar
EGElif Gundogdu
Elif Gundogdu
AYArda Sakir Yilmaz
Arda Sakir Yilmaz
BBBartu Badak
Bartu Badak
FBFatma Didem Bayav
Fatma Didem Bayav
SOSetenay Oner
Setenay Oner
Low anterior resection, performing total mesorectal excision with appropriate pelvic dissection to prevent local recurrence, is probably the most challenging type of surgery in colorectal surgery, especially in a narrow pelvis. In this study, we aimed to predict the operation difficulty of rectal cancer by comparing the operation time with 2D and 3D pelvimetry. Sixty-six patients who underwent total mesorectal excision after neoadjuvant chemoradiotherapy due to primary rectal cancer located in the middle and lower rectum (10 cm from the anus) were included in the study. Surgery notes were reviewed and data on demographic factors, tumor stage, duration of surgery, and types of surgery were collected, as well as pelvimetric parameters. All protocols had 2D T2-weighted sequences in 3 planes (axial, sagittal, and coronal). Pelvimetric measurements were made by measuring 8 pelvic lengths and 2 angles. Pelvis and tumor volume were measured by manual margin monitoring. In each slice, both pelvis and tumor boundaries were manually drawn individually in the sagittal plane. Pelvis and tumor volumes were calculated from the set of adjacent images by summing slice thickness and products of area measurements within the pelvis and tumor boundaries. In our results, no correlation was observed with operation time, including pelvic volume. Exception for this were interacetabular distance and tumor volume. In the regression test, the only parameter that correlated with the operation time was tumor volume. In conclusion, we believe that tumor volumetric calculations may be useful in predicting difficult distal rectal carcinoma surgeries.