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ALKAN, ALPAY

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ALPAY
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Author: ARALAŞMAK, AYŞE × Has files: true ×

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Now showing 1 - 10 of 10
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    PublicationOpen Access
    MRI and MR Spectroscopy Features of Heat Stroke: A Case Report
    (2018-07-01) Yilmaz, TEMEL FATİH; Aralasmak, AYŞE; Toprak, HÜSEYİN; GULER, Serhat; Tüzün, Umit; Alkan, ALPAY; YILMAZ, TEMEL FATİH; ARALAŞMAK, AYŞE; TOPRAK, HÜSEYİN; ALKAN, ALPAY
    Heat stroke is the outcome of over heat stress that results in multiorgan dysfunction with a tendency for central nervous system damage. Brain is very sensitive to hyperthermia, especially the cerebellum that has selective vulnerability to heat stroke. There is complex interaction between heat cytotoxicity, coagulation disorder, cytotoxine - mediated systemic inflammatory response causing multiorgan failure, metabolic derangement, and circulatory insufficiency. We reviewed the literature and discussed brain MRI and MR spectroscopy findings of heat stroke, detailed the pathophysiology underlying brain involvement and proposed excitotoxic injury as an alternative mechanism of brain damage in heat stroke.
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    PublicationOpen Access
    The Effect of Obesity on Brain Diffusion Alteration in Patients with Obstructive Sleep Apnea
    (2014-01-01) KILICARSLAN, Rukiye; Alkan, ALPAY; Sharifov, RASUL; Akkoyunlu, MUHAMMED EMİN; Aralasmak, AYŞE; KOCER, Abdulkadir; KART, Levent; ALKAN, ALPAY; SHARIFOV, RASUL; AKKOYUNLU, MUHAMMED EMİN; ARALAŞMAK, AYŞE
    Purpose: We investigated diffusion alterations in specific regions of the brain in morbid obese, obese, and nonobese OSA patients and searched whether there is a correlation between BMI and ADC values. Materials and methods: DWIs of 65 patients with OSA were evaluated. The patients were classified according to BMI as morbid obese (n = 16), obese (n = 27), and nonobese (control, n = 22) groups. ADC measurements were performed from 24 different regions of the brain in each patient. The relationship of BMI with ADC values was searched. Results: The ADC values in hypothalamus, insular cortex, parietal cortex, caudate nucleus, frontal white matter, and posterior limb of internal capsule were all increased in obese patients (n = 43) compared to control group. The ADC values of midbrain, hypothalamus, orbitofrontal cortex, and parietal cortex were significantly increased in morbid obese compared to obese patients. In obese patients, the degree of BMI was positively correlated with ADC values of orbitofrontal cortex, parietal cortex, and hypothalamus. Conclusion: We observed increasing brain vasogenic edema with increasing BMI, suggesting that the main reason of brain diffusion alteration in patients with OSA could be obesity related.
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    PublicationOpen Access
    Brain Diffusion Changes in Obstructive Sleep Apnoea Syndrome
    (2013-01-01) Akkoyunlu, MUHAMMED EMİN; Kart, Levent; KILICARSLAN, Rukiye; Bayram, MEHMET; Aralasmak, AYŞE; Sharifov, RASUL; Alkan, ALPAY; AKKOYUNLU, MUHAMMED EMİN; BAYRAM, MEHMET; ARALAŞMAK, AYŞE; SHARIFOV, RASUL; ALKAN, ALPAY
    Background: Obstructive sleep apnoea syndrome (OSAS) is a disorder characterized by repeated apnoeic episodes during sleep. Neurocognitive changes secondary to OSAS are likely to occur due to hypoxia in certain brain locations. Advances in magnetic resonance imaging technology, such as diffusion-weighted imaging (DWI), enable non-invasive and accurate identification of OSAS-induced changes. Objective: We aimed to use DWI to investigate changes in the brain secondary to hypoxia in OSAS. Methods: Eighty-eight patients underwent polysomnography and were classified as non-OSAS, mild-moderate OSAS and severe OSAS sufferers. DWI was used to evaluate 14 areas of the brain, and apparent diffusion coefficients (ADCs) were calculated. We investigated whether there were differences in the ADC values in specific areas of the brain between the non-OSAS and OSAS patients. Results: We measured the ADC values of the 68 newly diagnosed OSAS patients (21 mild, 15 moderate and 32 severe) and of 20 healthy controls. There were significant increases in the ADC values in the hippocampus, amygdala and putamen in OSAS patients. Compared to thenon-OSAS subjects, the ADC values of the putamen in severe OSAS patients, those of the hippocampus in moderate or severe OSAS patients and those of the amygdala in moderate OSAS patients were significantly increased. A negative correlation between the lowest oxygen saturation during sleep and the ADC values of the hippocampus and amygdala was found. Conclusions: Increased ADC levels in the hippocampus, amygdala and putamen in OSAS patients indicate hypoxia and likely cause vasogenic oedema in specific regions of the brain.
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    PublicationOpen Access
    Relationships of DTI findings with neurocognitive dysfunction in children with Type 1 diabetes mellitus
    (2016-01-01T00:00:00Z) Toprak, Huseyin; Yetis, Huseyin; Alkan, Alpay; Filiz, Mekiya; Kurtcan, Serpil; Aralasmak, Ayse; Aksu, Mehmet S.; Cesur, Yasar; TOPRAK, HÜSEYİN; ALKAN, ALPAY; KURTCAN, SERPİL; ARALAŞMAK, AYŞE; CESUR, YAŞAR
    Objective: To determine whether there were diffusion tensor imaging (DTI) changes in the brain among children with Type 1 diabetes mellitus (DM) and investigate the correlation between the fractional anisotropy (FA) and apparent diffusion coefficient (ADC) values and neurocognitive functions.
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    PublicationOpen Access
    Severe Posterior Reversible Encephalopathy in Pheochromocytoma: Importance of Susceptibility-Weighted MRI
    (2013-09-01) SERTER, Asli; Alkan, ALPAY; Aralasmak, AYŞE; KOCAKOC, Ercan; ALKAN, ALPAY; ARALAŞMAK, AYŞE
    Pheochromocytoma is a rare cause of hypertension in children. Hypertension is one of the common reasons of posterior reversible encephalopathy. Intracerebral hemorrhage is a serious and unexpected complication of hypertensive encephalopathy due to pheochromocytoma, and very rarely seen in the childhood. Intracerebral hemorrhages should be searched if there are hypertensive reversible signal changes on the brain. Susceptibility weighted imaging (SWI) is a more sensitive method than conventional MRI when demonstrating cerebral microhemorrhagic foci. This is the first report of SWI findings on intracerebral hemorrhages in basal ganglia, brain stem and periventricular white matter due to hypertensive encephalopathy in a child with pheochromocytoma.
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    PublicationOpen Access
    Pontine bleeding following drainage of subdural hematoma in craniospinal hypotension
    (2018-02-01) YILMAZ, TEMEL FATİH; ARALAŞMAK, AYŞE; TOPRAK, HÜSEYİN; Kocaman, Gulsen; ALKAN, ALPAY; YILMAZ, TEMEL FATİH; ARALAŞMAK, AYŞE; TOPRAK, HÜSEYİN; ALKAN, ALPAY
    Objective: Breast cancer (BC) is the most common female malignancy in the world and Turkey. Its prevalence and mortality are surprisingly increasing at a rapid rate. The objective of this study was to determine the effectiveness of training sessions on women's knowledge of relevant risk factors of BC and screening methods, screening behaviors and health beliefs among of healthy women in Turkey. Materials and methods: In this study, in order to establish the efficiency of BC training, a semi-empirical single group pre-test & post-test research model was used. The data were collected by using a self-administered questionnaire and by using the Turkish version of Champion's health belief model scale (CHBMS). The pre-test was performed before the training and after one week of the training, post-test was performed with a questionnaire having the same content. Results: In total, 244 women participated in the study. The average age of the women was 39.44 (SD=1.06) years. The mean total knowledge score increased significantly (p<.001) from 9.05 in the pre-test to 16.53 in the post-test. The results showed that both mean knowledge scores and CHBMS subscales scores of the women were increased significantly (p<.001) from the pre-test to the post-test. In multiple linear regression analysis, BC screening knowledge of women with susceptibility, benefit, self-efficacy and health motivation subscales of CHBMS, breast self-examination (BSE) practice and self-efficacy were also significant in the post-test; in the pre- and post-tests, a significant relationship among the level of education of women, susceptibility and seriousness was found (p<.001). Conclusion: The study showed that the training program had profound effects on BC knowledge, screening behaviors and health beliefs of women.
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    PublicationOpen Access
    Craniocervical Dissections: Radiologic Findings, Pitfalls, Mimicking Diseases: A Pictorial Review
    (2018-01-01) MEHDI, Elnur; Aralasmak, AYŞE; Toprak, HÜSEYİN; Yildiz, Seyma; Kurtcan, SERPİL; Kolukisa, MEHMET; Asil, TALİP; Alkan, ALPAY; ARALAŞMAK, AYŞE; TOPRAK, HÜSEYİN; YILDIZ, ŞEYMA; KURTCAN, SERPİL; KOLUKISA, MEHMET; ASİL, TALIP; ALKAN, ALPAY
    Background: Craniocervical Dissections (CCD) are a crucial emergency state causing 20% of strokes in patients under the age of 45. Although DSA (digital substraction angiography) is regarded as the gold standard, noninvasive methods of CT, CTA and MRI, MRA are widely used for diagnosis. Aim: Our aim is to illustrate noninvasive imaging findings in CCD. Conclusion: Emphasizing on diagnostic pitfalls, limitations and mimicking diseases.
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    PublicationOpen Access
    Microstructural brain changes in acromegaly: quantitative analysis by diffusion tensor imaging
    (2014-06-01) KILICARSLAN, R.; ILHAN, M. M.; Alkan, ALPAY; ARALASMAK, AYŞE; AKKOYUNLU, M. E.; KART, L.; TASAN, ERTUĞRUL; İLHAN, MAHMUT MUZAFFER; ALKAN, ALPAY; ARALAŞMAK, AYŞE; TAŞAN, ERTUĞRUL
    Objective: We examined brain diffusion changes of patients with acromegaly. We searched whether there are differences in apparent diffusion coefficient (ADC) and fractional anisotropy (FA) values between remission and nonremission patients with acromegaly and investigated any effect of time of hormone exposure on diffusion metrics. Methods: The values of FA and ADC were calculated in a total of 35 patients with acromegaly and 28 control subjects. Patients were subdivided into remission and non-remission groups. We looked at brain FA and ADC differences among the groups and looked for any relation between the diffusion changes and time of hormone exposure among the patients with acromegaly. Results: We found decreased FA and increased ADC values in some of the growth hormone responsive areas. There were no significant brain diffusion changes between remission and non-remission groups. The most affected areas were the hypothalamus, parietal white matter and pre-motor cortex in patients with acromegaly. In terms of hormone exposure time among the patients with acromegaly, there was no effect of disease duration on brain microstructural changes. Conclusion: All patients with acromegaly showed increased brain diffusion with no relation to disease duration and treatment status. We suggested that in patients with acromegaly, brain damage had already occurred in the subclinical period before symptom onset. Advances in knowledge: This study contributes to the understanding of the mechanisms in acromegaly.
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    PublicationOpen Access
    Involvement of the corpus callosum splenium in a case with SSPE: magnetic resonance spectroscopy findings
    (2013-04-01) Alkan, ALPAY; Sharifov, RASUL; GULER, Serhat; Aralasmak, AYŞE; KOCER, Abdulkadir; YUKSEL, Adnan; ALKAN, ALPAY; SHARIFOV, RASUL; ARALAŞMAK, AYŞE
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    PublicationOpen Access
    Venous drainage patterns in carotid cavernous fistulas
    (2017-01-01) ARALAŞMAK, AYŞE; KARAALİ, KAMİL; ÖZDEMİR, HÜSEYİN; ALKAN, ALPAY; TOPRAK, HÜSEYİN; SİNDEL, TİMUR; ŞENOL, UTKU; ÇEVİKOL, CAN; ARALAŞMAK, AYŞE; TOPRAK, HÜSEYİN; ÖZDEMİR, HÜSEYIN; ALKAN, ALPAY
    Purpose. The carotid-cavernous fistula (CCF) is an abnormal arteriovenous communication and its drainage pathways may affect the clinic presentation and change treatment approach. We evaluated drainage patterns of CCFs by digital subtraction angiography (DSA) and categorized drainage pathways according to their types and etiology. Materials and Methods. Venous drainage patterns of 13 CCFs from 10 subjects were studied and categorized as anterior, posterior, superior, inferior, and contralateral on DSA. Drainage patterns were correlated to types and etiology of CCFs. Diagnosis of CCFs was first made by noninvasive imaging techniques. Results. On DSA, traumatic CCFs were usually high flow, direct type while spontaneous CCFs were usually slow flow, indirect type. Bilaterality and mixed types were observed among the indirect spontaneous CCFs. In all CCFs, anterior and inferior drainages were the most common. Contrary to the literature, posterior and superior drainages were noted only in high flow and long standing direct fistulas. Contralateral drainage was not observed in all, supporting plausible compartmentalization of cavernous sinuses. Conclusion. Types, etiology, and duration of the CCFs may affect their drainage patterns. DSA is valuable for categorization of CCFs and verification of drainage patterns. Drainage pathways may affect the clinic presentation and also change treatment approach.