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Dive into the research topics where Mehmet Karatas is active.

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Featured researches published by Mehmet Karatas.


International Journal of Neuroscience | 2004

Personality, depression, and anxiety as risk factors for chronic migraine.

Basak Karakurum; Özlem Soylu; Mehmet Karatas; Semih Giray; Meliha Tan; Zülfikar Arlier; Sibel Benli

This article evaluated risk factors such as personality, depression, and anxiety in relation to migraine transformation in Turkish patients. Thirty-seven patients with chronic migraine and 50 patients with episodic migraine were investigated. The scores for hysteria, hypochondriasis, psychasthenia, depression, and social introversion were all significantly higher in the chronic-migraine group than the episodic-migraine group. Seventy-four percent of the chronic-migraine group and 26% of the episodic-migraine group had depression. Eighty percent of the chronic-migraine group and 36% of the episodic-migraine group had anxiety. The results suggest that depression, anxiety, and personality characteristics such as hysteria, hypochondriasis, psychasthenia, depression, and social introversion may be associated with chronic migraine in Turkish patients.


Headache | 2006

Is low blood magnesium level associated with hemodialysis headache

Başak Karakurum Göksel; Dilek Torun; Sibel Karaca; Mehmet Karatas; Meliha Tan; Nurzen Sezgin; Sibel Benli; Siren Sezer; Nurhan Ozdemir

Objective.—The aim of this study was to evaluate the prevalence, demographic, clinical features, and possible risk factors for hemodialysis headache (HDH).


Headache | 2007

Heart rate recovery in migraine and tension-type headache.

Deniz Yerdelen; Tayfun Acil; Başak Karakurum Göksel; Mehmet Karatas

Objective.— There are reports proposing that migraine and tension‐type headache (TTH) may affect the autonomic nervous system (ANS). Abnormalities in both sympathetic and parasympathetic nervous system have been suggested in migraineurs. However, in TTH, reports on the ANS function are limited and only associated with sympathetic system. Techniques for evaluating parasympathetic activity are more limited when compared with sympathetic function. Hence, the aim of the study was to measure heart rate recovery (HRR), an index of vagal activity, in migraine, TTH, and control subjects.


The journal of the Turkish Society of Algology | 2014

Use of complementary and alternative medicine by a sample of Turkish primary headache patients.

Başak Karakurum Göksel; Ozlem Coskun; Serap Üçler; Mehmet Karatas; Aynur Özge; Seçil Özkan

OBJECTIVE Complementary and alternative medicine (CAM) is increasingly being used as adjunctive treatment in primary headache syndromes in many countries. In the Turkish population, no epidemiologic data have been reported about awareness and usage of these treatments in patients with headache. METHODS One hundred and ten primary headache patients attending three headache clinics completed a questionnaire regarding their headaches, the known modalities and the use and effect of CAM procedures for their headaches. RESULTS The mean age of the patients was 34.7±9.6 years (32.8-36.5). Almost two-thirds of patients had completed high school and university, and one-third of patients were housewives. Migraine without aura (45.5%) was the most frequently diagnosed type of headache followed by migraine with aura (19.1%) and tension-type headache (18.2%). In 43.6% of the patients, headache frequency was 5-10 per month. The most frequently known CAM modalities were massage (74.5%), acupuncture (44.5%), yoga (31.8%), exercise (28.2%), psychotherapy (25.5%), and rosemary (23.6%). The most frequently used CAM treatments were massage (51%) and exercise (11%). Only massage was reported to be beneficial in one-third of the primary headache patients; the other modalities were not. CONCLUSION Our findings suggest that the subgroup of primary headache patients in Turkey seek and use alternative treatments, frequently in combination with standard treatments. Neurologists should become more knowledgeable regarding CAM therapies; further randomized and controlled clinical researches with large sample sizes are needed.


International Journal of Neuroscience | 2008

“Unertan Syndrome” in two Turkish Families in Relation to Devolution and Emergence of Homo Erectus: Neurological Examination, MRI, and pet Scans

Uner Tan; Sadrettin Pence; Mustafa Yilmaz; Ayhan Ozkur; Si˙bel Karaca; Meli˙ha Tan; Mehmet Karatas

“Unertan syndrome” consists of two main symptoms: quadrupedal gait and primitive cognitive abilities including language and conscious experience. To assess the central mechanisms involved in this syndrome, the authors performed MRI and PET scans on affected and unaffected individuals from both families. All affected individuals were also subjected to neurological examination. To assess the integrity of the peripheral and central vestibular system, Baranys caloric test was applied to the affected individuals. Brain MRI and PET scans were performed on normal subjects (n = 7) and patients (n = 7). Right- and left-cerebral and cerebellar areas, including the vermial and callosal areas, were measured on the MRI scans using a computer cursor. Quadrupedal gait, mental retardation, dysartric speech, nystagmus, severe truncal ataxia, hyperreflexia, astasia, and abasia were observed in the affected individuals from both families. Cerebellum and vermis were atrophic in the MRI and PET scans of the first family. In contrast, the brain MRI seemed to be normal in the MRI and PET scans of affected individuals from the second family. The caloric test revealed central vestibular damage in patients from the first family and peripheral vestibular damage in patients from the second family. The results suggest that “Unertan syndrome,” discovered in two unrelated families, may be caused by peripheral or central vestibular damage resulting from different genetic defects. Cerebellar hypoplasia may not be a prerequisite for the emergence of this syndrome. Primitive mental abilities may be explained by damage within the vestibulo-cerebellar system, whereas the quadrupedal gait may be due to a genetic defect within the higher brain centers that suppress the atavistic brain networks controlling quadrupedal gait and helped in the emergence of the habitual bipedal gait during human evolution. This retarded development of human locomotion—devolution—may illuminate the brain mechanisms responsible for the transition from quadrupedality to bipedality in human evolution.


Scandinavian Journal of Infectious Diseases | 2006

Abducens nerve palsy and optic neuritis as initial manifestation in brucellosis

Başak Karakurum Göksel; Deniz Yerdelen; Mehmet Karatas; Aysel Pelit; Y.Ziya Demiroglu; Osman Kizilkilic; Meliha Tan; Okan Toygar

Cranial nerve involvement in brucellosis is rare. We present a case of brucellosis presenting with optic neuritis and abducens nerve palsy on the left side. Cerebrospinal fluid findings indicated Brucella meningitis with high protein count, low sugar level and pleocystosis. In addition, Brucella agglutination test (Wright test) was found to be 1/128 in cerebrospinal fluid. Serum agglutination test for Brucella was also positive at 1/1280. This case was diagnosed as brucellosis involving optic and abducens nerves. The patient was treated by ceftriaxone (intravenous), rifampicin (orally) and doxycycline (orally). Two months later the patients vision acuity in the left eye had moderately improved and the patients left abducens palsy had almost disappeared. In conclusion, cranial nerve involvement in brucellosis can have good prognosis if anti-Brucella treatment is undertaken early.


American Journal of Emergency Medicine | 2016

Monocyte to high-density lipoprotein ratio as a new prognostic marker in patients with STEMI undergoing primary percutaneous coronary intervention

Mehmet Karatas; Yiğit Çanga; Kazım Serhan Özcan; Göktürk İpek; Barış Güngör; Tolga Onuk; Gündüz Durmuş; Ahmet Öz; Mehmet Ali Karaca; Osman Bolca

BACKGROUND Monocyte count to high-density lipoprotein ratio (MHR) has recently emerged as an indicator of inflammation and oxidative stress in the literature. We aimed to investigate the prognostic value of MHR in patients with ST-segment elevation myocardial infarction treated with primary percutaneous coronary intervention (PCI). METHODS A total of 513 patients who were hospitalized with diagnosis of acute ST-segment elevation myocardial infarction and treated with primary PCI were retrospectively enrolled in the study. Demographic and clinical data, admission laboratory parameters, and MHR values were recorded. Inhospital major adverse cardiac events (MACE) and mortality were reported as the clinical outcomes. RESULTS Twenty-six patients (5%) died, and MACE was observed in 86 patients (17%) during hospital follow-up. Patients were categorized in 3 groups according to tertiles of admission MHR. The rates of inhospital mortality and MACE were significantly higher in tertile 3 group compared to tertile 1 group (10% vs 1%, 27% vs 11%; P < .01 and P < .01). In multivariate regression analysis, age, sex, presence of Killip 3 or 4, left ventricular ejection fraction, troponin I, C-reactive protein, and increased MHR levels (odds ratio, 1.03; 95% confidence interval, 1.01-1.05; P < .01) independently predicted inhospital mortality; age, presence of Killip 3 or 4, troponin I, and increased MHR levels (odds ratio, 1.02; 95% confidence interval, 1.01-1.04; P < .01) independently predicted MACE. CONCLUSION Admission MHR values were found to be independently correlated with inhospital MACE and mortality after primary PCI.


Angiology | 2016

CHA2DS2-VASc Score is a Predictor of No-Reflow in Patients With ST-Segment Elevation Myocardial Infarction Who Underwent Primary Percutaneous Intervention.

Göktürk İpek; Tolga Onuk; Mehmet Karatas; Barış Güngör; Altug Osken; Muhammed Keskin; Ahmet Öz; Ozan Tanik; Mert İlker Hayıroğlu; Hale Yilmaz Yaka; Recep Ozturk; Osman Bolca

Thrombosis and distal embolization play crucial role in the etiology of no-reflow. CHA2DS2-VASc score is used to estimate the risk of thromboembolism in patients with atrial fibrillation. We tested the hypothesis that CHA2DS2-VASc can predict no-reflow among patients who underwent primary percutaneous coronary intervention (PCI). A total number of 2375 consecutive patients with ST-segment elevation myocardial infarction were assessed for the study. Patients were divided into 2 groups as no-reflow (n = 111) and control (n = 1670) groups according to post-PCI no-reflow status. CHA2DS2-VASc scores were calculated for all patients. CHA2DS2-VASc scores were significantly higher in the no-reflow group compared to the control group. After a multivariate regression analysis, CHA2DS2-VASc score remained as an independent predictor (odds ratio: 1.58, 95% confidence interval: 1.33-1,88, P < .001) of no-reflow. Receiver–operating characteristics analysis revealed the cutoff value of CHA2DS2-VASc score ≥2 as a predictor of no-reflow with a sensitivity of 66% and a specificity of 59%. Moreover, in-hospital mortality was also associated with significantly higher CHA2DS2-VASc scores. In conclusion, CHA2DS2-VASc score is associated with higher risk of no-reflow and in-hospital mortality rates in patients who underwent primary PCI.


Annals of Noninvasive Electrocardiology | 2016

Prognostic Value of QRS Fragmentation in Patients with Acute Myocardial Infarction: A Meta-Analysis

Baris Gungor; Kazım Serhan Özcan; Mehmet Karatas; İrfan Şahin; Recep Öztürk; Osman Bolca

Fragmented QRS has emerged as a novel electrocardiographic parameter associated with adverse clinical events in various diseases. The aim of this study was to investigate the association of fQRS with in‐hospital and long‐term cardiovascular events in patients with ST‐segment elevation myocardial infarction (STEMI) and non‐ST segment elevation myocardial infarction (NSTEMI).


Coronary Artery Disease | 2016

Association of admission serum laboratory parameters with new-onset atrial fibrillation after a primary percutaneous coronary intervention.

Mehmet Karatas; Yiğit Çanga; Göktürk İpek; Kazım Serhan Özcan; Barış Güngör; Gündüz Durmuş; Tolga Onuk; Ahmet Öz; Bariş Şimşek; Osman Bolca

ObjectivesNew-onset atrial fibrillation (NOAF) during hospitalization is considered a frequent complication associated with worse outcomes in the setting of ST-segment elevation myocardial infarction (STEMI). We aimed to investigate the association of admission serum laboratory parameters, neutrophil to lymphocyte ratio (NLR), and monocyte to high-density lipoprotein ratio (MHR) with NOAF in STEMI patients treated with a primary percutaneous coronary intervention (PCI). Patients and methodsA total of 621 patients who were hospitalized with a diagnosis of STEMI and treated with primary PCI were retrospectively enrolled in the study. NOAF during index hospitalization and overall mortality were reported as the clinical outcomes. ResultsIn our study population, 40 (6.4%) patients developed NOAF during index hospitalization. Monocyte counts, mean platelet volume (MPV), red cell distribution width (RDW), NLR, MHR, C-reactive protein (CRP), creatinine, glucose, and uric acid levels were higher in the NOAF+ group compared with the NOAF− group. In multivariate regression analysis, age, left-ventricular ejection fraction, left atrial volumes, admission heart rate, multivessel disease, increased levels of CRP, MPV, RDW, uric acid, NLR, and MHR independently predicted NOAF. In addition, NOAF was found to be an independent predictor of overall mortality in the study population. ConclusionFor the first time in the literature, admission serum levels of MPV, RDW, uric acid, NLR, and MHR were found to be correlated independently with NOAF after primary PCI.

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Göktürk İpek

Brigham and Women's Hospital

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Tolga Onuk

Zonguldak Karaelmas University

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Semih Giray

University of Gaziantep

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