Oguz KARAHAN

Prof. Dr. Oguz KARAHAN

orcid

Research Focus & Metrics

Academic Career Length

17Years (2010-Present)

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

Representative Publications

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1 June 2016 in The American Journal of Emergency Medicine
Verified
Journal Article
Closed access
OKOguz KARAHAN
Oguz KARAHAN
HAHalit Acet
Halit Acet
FEFaruk Ertaş
Faruk Ertaş
OTOrhan Tezcan
Orhan Tezcan
AÇAhmet Çalişkan
Ahmet Çalişkan
CYCelal Yavuz
Celal Yavuz

12 February 2014 in Vascular
Verified
Journal Article
Closed access
SDSinan Demirtas
Sinan Demirtas
OKOguz KARAHAN
Oguz KARAHAN
SYSuleyman Yazici
Suleyman Yazici
OGOrkut Guclu
Orkut Guclu
ACAhmet Caliskan
Ahmet Caliskan
BMBinali Mavitas
Binali Mavitas
The aim of the present study is to evaluate whether blood count parameters differ according to the stages of Fontaine’s classification and to investigate the relationship between hemogram parameters and the severity of the disease. Eighty-two peripheral arterial disease patients were examined prospectively. Patients were classified according to the Fontaine classification system. Fifty newly diagnosed patients were included in the study. The neutrophil-to-lymphocyte ratio, mean platelet volume, and red blood cell distribution width values were recorded. Mean neutrophil-to-lymphocyte ratio values were found to be 3.31 ± 1.1% in Stage I, 3.11 ± 1.3% in Stage II, and 3.48 ± 1.1% in Stage III (p > 0.05). Mean platelet volume values were found to be 7.8 ± 0.6 fl (Stage I), 8.2 ± 1.0 fl (Stage II), and 9.0 ± 0.9 fl (Stage III) (p < 0.05). Red blood cell distribution width values were found to be 13.6 ± 1.0% in Stage I, 14.8 ± 1.7% in Stage II, and 15.4 ± 2.3% in Stage III, being significantly different among all three stages (p < 0.05). Both red blood cell distribution width and mean platelet volume are found to be associated with the severity of atherosclerotic disease in patients with peripheral arterial disease. This finding hypothesizes that complete blood counting parameters may serve as a beneficial and cost-effective method for monitoring atherosclerotic peripheral disease.

1 January 2013 in Surgical Neurology International
Verified
Journal Article
Open access
OKOguz KARAHAN
Oguz KARAHAN
CYCelal Yavuz
Celal Yavuz
SDSinan Demirtas
Sinan Demirtas
ACAhmet Caliskan
Ahmet Caliskan
KKKaan Kamasak
Kaan Kamasak
BMBinali Mavitas
Binali Mavitas
Ventricular shunts are used to drain cerebrospinal fluid into extra-cranial spaces. Ventriculoatrial (VA) shunts are provided to transfer cerebrospinal fluid from the cerebral ventricle into the right atrium of the heart. A single center experience of indications, procedure, and clinical outcomes in VA shunt was presented in current study. VA shunts were applied in 10 patients who had repeated previous shunt dysfunction or infection. The reasons, clinical findings, replacement methods, and postoperative clinical follow-ups and outcomes were recorded retrospectively. There were seven female (70%) and three (30%) male patients; their ages ranged from 5 to 13 years (mean ± SD; 8.5 ± 2.6 years). Shunt re-placement reasons were as follows: Shunt occlusion in five patients, intraperitoneal infection in four patients and a distal catheter was kinked and knotted in one patient. Postoperative early complications were seen in one patient as early catheter thrombosis and catheter revision were applied. Late complications were seen in two patients as follows: Catheter infection and infective endocarditis occurred in one patient and pulmonary thrombus occurred in one other patient. There was not any catheter-related mortality observed at the one year follow-up period. VA shunts may be an option for cerebrospinal fluid drainage at necessary conditions. However, sterilization and general training on asepsy and antisepsy are the most important determinants affecting the clinical outcome due to the cardio systemic relationship.

1 September 2016 in Blood Coagulation & Fibrinolysis
Verified
Journal Article
Closed access
OKOguz KARAHAN
Oguz KARAHAN
CYCelal Yavuz
Celal Yavuz
NKNazim Kankilic
Nazim Kankilic
SDSinan Demirtas
Sinan Demirtas
OTOrhan Tezcan
Orhan Tezcan
BMBinali Mavitas
Binali Mavitas
Chronic venous insufficiency (CVI) is a progressive inflammatory disease. Because of its inflammatory nature, several circulating markers were investigated for predicting disease progression. We aimed to investigate simple inflammatory blood markers as predictors of clinical class and disease severity in patients with CVI. Eighty patients with CVI were divided into three groups according to clinical class (grade 1, 2 and 3) and score of disease severity (mild, moderate and severe). The basic inflammatory blood markers [neutrophil, lymphocyte, mean platelet volume (MPV), white blood cell (WBC), platelet, albumin, D-dimer, fibrinogen, fibrinogen to albumin ratio, and neutrophil to lymphocyte ratio] were investigated in each group. Serum neutrophil, lymphocyte, MPV, platelet count, D-dimer and neutrophil to lymphocyte ratio levels were similar among the groups (P > 0.05). Although the serum WBC levels were significant in the clinical severity groups (P < 0.05), it was useless to separate each severity class. However, albumin, fibrinogen and the fibrinogen to albumin ratio were significant predictors of clinical class and disease severity. Especially, the fibrinogen to albumin ratio was detected as an independent indicator for a clinical class and disease severity with high sensitivity and specificity (75% sensitivity and 87.5% specificity for clinical class and 90% sensitivity and 88.3% specificity for disease severity). Serum fibrinogen and albumin levels can be useful parameters to determine clinical class and disease severity in patients with CVI. Moreover, the fibrinogen to albumin ratio is a more sensitive and specific predictor of the progression of CVI.

5 October 2020 in International Wound Journal
Verified
Journal Article
Open access
PDF file
AGAnıl GÜLCÜ
Anıl GÜLCÜ
MEMustafa Etli
Mustafa Etli
OKOguz KARAHAN
Oguz KARAHAN
AAAhmet Asan
Ahmet Asan
Diabetic foot is challenging progressive disease which requires multisystemic control. Neuropathy, arteriopathy, and cellular responses should treated collaboratively. Despite all medical advances, diabetic foot can highly resulted with amputation and also re‐amputation can be required because of failed wound healing. In this study, we aimed to investigate the relation between blood parameters and amputation events. Diabetic 323 patients include to the study who referred to orthopaedic clinic for amputation. Amputation levels (amputation levels phalanx, metatarsal, lisfranc, syme, below knee, knee‐disarticulation, above‐knee amputation) and re‐amputations recorded and compared with routine blood parameters. Re‐amputation was observed at 69 patients. The significant difference detected between lower albumin, higher HbA1c, higher CRP levels (P < 0.05) in regards to gross amputation levels, and increased wound depth. Furthermore, lower albumin levels and higher levels of WBC, HbA1c, CRP, and Creatinine were detected in re‐amputation levels. Especially, HbA1c, CRP, and Creatinine levels were found as upper bound of reference line for re‐amputation. The statistically optimal HbA1c cutoff point for diabetes was ≥7.05%, with a sensitivity of 86% and a specificity of 59%. In according to our results, simple blood parameters can be useful for observing the progress of amputation in diabetic foot. Particularly, lower albumin, and higher HbA1c, CRP, and Creatinine levels detected as related with poor prognosis. Besides, screening of HbA1c level seems to be highly sensitive for detecting of re‐amputation possibility.

12 November 2013 in Journal of Thrombosis and Thrombolysis
Verified
Journal Article
Closed access
PDF file
ACAhmet Caliskan
Ahmet Caliskan
CYCelal Yavuz
Celal Yavuz
OKOguz KARAHAN
Oguz KARAHAN
SYSuleyman Yazici
Suleyman Yazici
OGOrkut Guclu
Orkut Guclu
BMBinali Mavitas
Binali Mavitas