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Sade LE, Colak A, Sezgin A, Donal E, Butcher SC, Pirat B, Eroglu S, Ozdemir H, Muderrisoglu H. Right ventricular adaptation and subclinical damage by echocardiography in heart transplantation recipients: insights from myocardial work index. Eur Heart J 2022. [DOI: 10.1093/eurheartj/ehac544.116] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Abstract
Aim
Right ventricular (RV) dysfunction is an important cause of graft failure after heart transplantation (HTx) and a challenge for echocardiographic evaluation. We sought to evaluate the accuracy of the most novel echocardiographic tools for the assessment of RV remodelling and function in asymptomatic HTx recipients with and without rejection.
Methods
All patients underwent right heart catheterization with biopsy, cardiac magnetic resonance (CMR) and echocardiography in a row within the same day while fasting, irrespective of symptoms, as part of institutional follow up protocol dedicated to HTx recipients. Invasively measured systolic pulmonary artery pressure was used to calculate RV myocardial work index (MWI) from strain-pressure loops by using the custom software (EchoPAC BT204, Horten, Norway). Event timings were determined from pulmonic and tricuspid valve opening and closures. With the aim to generate full bull's eye map by automated function imaging, we computed RV LS data from the apical 4-chamber view 3 times, from 3 consecutive cycles substituting apical LV views. Other indices of RV function were measured according to the EACVI 2015 recommendations for chamber quantification. RV volumes and ejection fraction (EF) were quantified by CMR. Echocardiographic measurements were compared with CMR derived RV EF and biopsy findings as the reference for microstructural changes. We also evaluated by echocardiography organ donors as healthy controls.
Results
Sixty-one fully matching studies (echo, CMR, catheter, biopsy) were analyzed. Tricuspid systolic annular velocity (S'), peak systolic excursion (TAPSE) and longitudinal strain (LS) were significantly lower in healthy HTx recipients as compared to controls (p<0.001 for all). Whereas, RV volumes, EF and fractional area change (FAC) were not different between HTx recipients and healthy controls (Figure 1, EDV:end-diastolic volume). In the overall HTx recipients, only FAC (r=0.51, p<0.001) but not S', TAPSE, LS or MWI correlated with CMR derived EF. Biopsy defined subclinical rejections however were nicely mirrored by LS, and MWI (Figure 2), whereas other indices failed to reflect microstructural changes. In addition, MWI had higher accuracy than LS to discriminate biopsy findings. RV volumes, EF, FAC as well as TAPSE, S' were insensitive to subclinical myocardial damage.
Conclusion
RV adaptation in healthy HTx recipients is characterized by decreased longitudinal function but preserved overall RVFAC, EF, and volumes. MWI seems to be more reliable than other echocardiographic parameters to track subclinical RV myocardial damage due to rejection, while the RV EF remains preserved.
Funding Acknowledgement
Type of funding sources: None.
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Affiliation(s)
- L E Sade
- Upmc University of Pittsburgh Medical Center , Pittsburgh , United States of America
| | - A Colak
- Baskent University, Faculty of Medicine , Ankara , Turkey
| | - A Sezgin
- Baskent University, Faculty of Medicine , Ankara , Turkey
| | - E Donal
- University of Rennes 1, Cardiology , Rennes , France
| | - S C Butcher
- Leiden University Medical Center, Cardiology , Leiden , The Netherlands
| | - B Pirat
- Baskent University, Faculty of Medicine , Ankara , Turkey
| | - S Eroglu
- Baskent University, Faculty of Medicine , Ankara , Turkey
| | - H Ozdemir
- Baskent University, Faculty of Medicine , Ankara , Turkey
| | - H Muderrisoglu
- Baskent University, Faculty of Medicine , Ankara , Turkey
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2
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Sade LE, Colak A, Duzgun SA, Hazirolan T, Sezgin A, Ozdemir H, Eroglu S, Pirat B, Muderrisoglu H. T1 mapping of the right ventricle in heart transplant recipients: how does it correlate with endomyocardial biopsy findings? Eur Heart J 2022. [DOI: 10.1093/eurheartj/ehac544.1024] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Abstract
Aim
Noninvasive detection of cardiac allograft rejection is highly desirable. We sought to assess how right ventricular (RV) T1 mapping correlates with endomyocardial biopsy findings.
Methods
All patients underwent right heart catheterization with biopsy and cardiac magnetic resonance (CMR) irrespective of symptoms, as part of the institutional registry protocol dedicated to heart transplant (HTx) recipients. CMR studies were performed using a 1.5 T scanner and analyses by using a commercially available software (CMR42, Circle CVI, Calgary, Canada). Endocardial and epicardial borders were drawn on end-systolic and end-diastolic phases for ventricular function analysis. For T1 measurements, region of interests located at the RV free-wall were drawn manually on midventricular short-axis slices avoiding blood pool and epicardial fat. Extracellular volume (ECV) was calculated as ECV = (1 − hematocrit) × (ΔR1 myocardium/ΔR blood), where R1 = 1/T1. Late gadolinium enhancement (LGE) images were also obtained using a phase-sensitive inversion recovery segmented gradient echo sequence. Hyperenhancement was assessed semi-quantitatively as segmental (2–3 cm) or diffuse (>3 cm). Allograft rejection was determined based on the severity of inflammatory infiltrates and myocyte damage on pathological specimens according to the standardized International Society for Heart and Lung Transplantation (ISHLT) nomenclature.
Results
In all, 61 paired studies were evaluated. None of the patients had heart failure symptoms. We defined 3 subgroups: Group I; never rejected (n=23), group II; biopsy remarkable for rejection (n=19) and group III; history of past rejection(s) (n=19). RV volumes and ejection fraction (EF) did not differ between the groups. However, rejections were nicely mirrored by T1 time and particularly by ECV. Of note, T1 time and ECV improved but not completely normalized after resolution of rejection. Overall, T1 time (cut off 1060ms) and ECV (cut off 35%) were sensitive (84%, both) and had high negative predictive values (88% and 87%, respectively) but not specific (43% and 52% respectively) for discriminating rejection related subclinical RV damage. Their specificity slightly improved to 52 and 61% respectively, if patients with previous rejection were excluded (Figure 1). LGE did not discriminate rejection.
Conclusion
RV volumes and EF are insensitive to detect allograft rejection. Native T1 time and ECV of the RV, as a means of extracellular expansion, likely reflect interstitial fibrosis, oedema, and inflammation that are typical for, but not limited to allograft rejection. Hence, these parameters can help to exclude rejection but have limited standalone value for making the nonivasive diagnosis due to their low specificity. These results cannot be extrapolated to the left ventricle.
Funding Acknowledgement
Type of funding sources: Private hospital(s). Main funding source(s): University of Baskent
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Affiliation(s)
- L E Sade
- Upmc University of Pittsburgh Medical Center , Pittsburgh , United States of America
| | - A Colak
- Baskent University, Faculty of Medicine , Ankara , Turkey
| | - S A Duzgun
- Hacettepe University, Radiology , Ankara , Turkey
| | - T Hazirolan
- Hacettepe University, Radiology , Ankara , Turkey
| | - A Sezgin
- Baskent University, Faculty of Medicine , Ankara , Turkey
| | - H Ozdemir
- Baskent University, Faculty of Medicine , Ankara , Turkey
| | - S Eroglu
- Baskent University, Faculty of Medicine , Ankara , Turkey
| | - B Pirat
- Baskent University, Faculty of Medicine , Ankara , Turkey
| | - H Muderrisoglu
- Baskent University, Faculty of Medicine , Ankara , Turkey
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Yaşar H, Colak A, Demirpence M, Girgin E, Aslan F, Taylan A, Ceylan C. DO ANDROGENS PREDICT CARDIOVASCULAR RISK INCLUDING CARDIOTROPHIN-1 LEVELS in PATIENTS WITH OBESE and LEAN POLYCYSTIC OVARY SYNDROME. Acta Endocrinol (Buchar) 2022; 18:466-473. [PMID: 37152878 PMCID: PMC10162820 DOI: 10.4183/aeb.2022.466] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/09/2023]
Abstract
Introduction We aimed to investigate Cardiotrophin-1 (CT-1) levels along with other markers of cardiovascular disease and the association of androgen levels with these parameters in both lean and overweight or obese PCOS patients. Material and Methods The study included 90 overweight or obese PCOS patients with metabolic syndrome (MS) and 80 lean PCOS patients without MS. The control group consisted of 140 healthy females. Anthropometric measurements, plasma glucose, insulin, lipid and hormone profile, homocysteine, hs-CRP, CT-1 levels and carotid-IMT were evaluated in all study subjects. Results Fasting insulin, HOMA values were significantly higher in obese PCOS patients. Total testosteron levels were higher in both PCOS groups with respect to both controls. Serum homocysteine, hs-CRP, CT-1 and carotid-IMT values were significantly higher in both PCOS groups compared to controls (p=0.001, pCIMT: 0.005). CT-1 was positively correlated with insulin, HOMA, total testosterone, homocysteine, hs-CRP and carotid IMT. After multiple regression analysis, CT-1 was significantly positively correlated with total testosterone, hs-CRP and carotid IMT. Conclusions CT-1 was associated with other cardiovascular risk markers and its use as a cardiovascular risk marker might be suggested. Cardiovascular risk was increased even in lean PCOS patients without MS and it might be associated with elevated androgen levels.
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Affiliation(s)
- H.Y. Yaşar
- Endocrinology, Tepecik Research and Training Hospital, Turkey
| | - A. Colak
- Biochemistry, Tepecik Research and Training Hospital, Turkey
| | - M. Demirpence
- Endocrinology, Tepecik Research and Training Hospital, Turkey
| | - E. Girgin
- Biochemistry, Tepecik Research and Training Hospital, Turkey
| | - F.D. Aslan
- Biochemistry, Tepecik Research and Training Hospital, Turkey
| | - A. Taylan
- Rheumatology, Tepecik Research and Training Hospital, Turkey
| | - C. Ceylan
- Hematology,Tepecik Research and Training Hospital, Turkey
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4
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Ayazoglu Demir E, Colak A, Celik Uzuner S, Bekircan O. Cytotoxic effect of a 3-(4-chlorophenyl)-5-(4-methoxybenzyl)-4H-1,2,4-triazole derivative compound in human melanoma cells. ijbch 2021. [DOI: 10.26577/ijbch.2021.v14.i1.015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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5
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Dokuzparmak C, Colak A, Kolcuoglu Y, Akatin MY, Ertunga NS, Tuncay FO. Development of Some Properties of a Thermophilic Recombinant Glucose Isomerase by Mutation. APPL BIOCHEM MICRO+ 2020. [DOI: 10.1134/s0003683820020052] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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6
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Turgut D, Colak A, Koksal Cevher S, Coskun Yenigun E, Dede F. SUN-381 GLOMERULAR AREA İN PRİMARY GLOMERULAR DİSEASES. Kidney Int Rep 2020. [DOI: 10.1016/j.ekir.2020.02.920] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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7
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Sade LE, Keskin S, Colak A, Ciftci O, Can U, Kibaroglu S, Yuce D, Ozin B, Muderrisoglu H. P1797 Left atrial mechanics in patients with stoke: Implications for emprical anticoagulation. Eur Heart J Cardiovasc Imaging 2020. [DOI: 10.1093/ehjci/jez319.1152] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Abstract
Purpose
Detection of atrial fibrillation (AF) after stroke impacts patient management. However, detection of AF is difficult due to its paroxsysmal nature. We sought to test the hypothesis that echocardiographic quantification left atrial (LA) mechanics in patients with stoke can be an imaging biomarker to predict AF.
Methods
We enrolled prospectively and consecutively 131 patients in normal sinus rhythm with a new diagnosis of ischemic stroke. All patients underwent 48-hour Holter monitorization, transthoracic echocardiography with saline injection in addition to routine work-up of stroke evaluation. Two-dimensional and Doppler studies, together with most up-to-date LA quantification tools were performed including 3-dimensional LA phasic volumes (maxiumum and minimum LA Volume index - LAVImax, LAVImin) and LA strain quantification (average strain from apical 4- and 2-chamber during reservoir (Ss) and contraction (Sa) phases). Patients were followed-up and underwent second 48-hour Holter monitorization 6-12 months later if no etiologic cause was found. Any AF episode lasting >30 seconds was considered significant parosysmal AF.
Results
In 49 patients, causes other than AF were identified (Noncryptogenic). In 43 patients no discernable cause was found (NoAF Cryptogenic). Paroxysmal AF episodes lasting longer than 30 sec were documented in 27 patients at first 48-hour Holter and in 12 patients during follow-up (9.2 ± 3.1 months) either by second 48-hour Holter monitorization or clinically (AF cryptogenic). LAVImax and LAVImin were significantly increased, Ss and Sa were significantly reduced in patients with AF as compared to No AF and Noncryptogenic groups (Table). LA volumes and strain measures predicted AF development independently of CHA2DS2-VASc score. Better discrimination between No AF and AF groups was obtained after second Holter monitorization that enabled detection of more cases with paroxysmal AF (Figure).
Conclusions
Our findings underscore the value of echocardiographic assessment of LA function as a marker of AF development and for selection of patients who could benefit from empiric anticoagulation.
Noncryptogenic AF cryptogenic No AF cryptogenic 3D LAVI max (ml/m²) 30.1 ± 9,4 38.1 ± 12.7 28.9 ± 9.2 3D LAVI min (ml/m²) 13.9 ± 7.5 20.7 ± 10.7 13.4 ± 5.3 3D LA EF (%) 55.5 ± 9.4 50.0 ± 10.5 53.8 ± 10.0 Ss (%) 17.4 ± 8.5 12.7 ± 5.3 17.5 ± 8.5 Sa (%) 12.7 ± 6.3 9.0 ± 5.0 12.8 ± 6.3 CHA2DS2-VASc 4.0 ± 1.6 5.0 ± 1.6 3.9 ± 1.5
Abstract P1797 Figure.
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Affiliation(s)
- L E Sade
- Baskent University, Faculty of Medicine, Ankara, Turkey
| | - S Keskin
- Baskent University, Faculty of Medicine, Ankara, Turkey
| | - A Colak
- Baskent University, Faculty of Medicine, Ankara, Turkey
| | - O Ciftci
- Baskent University, Faculty of Medicine, Ankara, Turkey
| | - U Can
- Baskent University, Neurology, Ankara, Turkey
| | - S Kibaroglu
- Baskent University, Neurology, Ankara, Turkey
| | - D Yuce
- Hacettepe University, Ankara, Turkey
| | - B Ozin
- Hacettepe University, Ankara, Turkey
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8
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Isbilen-Basok B, Karakoyun I, Arslan F, Colak A. An atypical preanalytical error in urinalysis. Clin Chim Acta 2019. [DOI: 10.1016/j.cca.2019.03.502] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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9
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Demirpence M, Guler A, Yilmaz H, Sayin A, Pekcevik Y, Turkon H, Colak A, Ari EM, Aslanipour B, Kocabas GU, Calan M. Is elevated urotensin II level a predictor for increased cardiovascular risk in subjects with acromegaly? J Endocrinol Invest 2019; 42:207-215. [PMID: 29804270 DOI: 10.1007/s40618-018-0905-1] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/31/2017] [Accepted: 05/18/2018] [Indexed: 02/07/2023]
Abstract
PURPOSE Acromegaly is a rare disorder existed in the result of overproduction of growth hormone (GH). The disorder is associated with increased cardiovascular risk factors and metabolic abnormalities. Urotensin II (UII), a secreted vasoactive peptide hormone, belonging somatostatin superfamily, plays an essential role in atherosclerosis and glucose metabolism. The aim of this study was to ascertain whether circulating UII levels are altered in subjects with acromegaly, and to describe the relationship between UII and hormonal or cardiometabolic parameters. METHODS This cross-sectional study included 41 subjects with active acromegaly, 28 subjects with controlled acromegaly, and 37 age- and BMI-matched controls without acromegaly. Hormonal and metabolic features of the subjects as well as carotid intima media thickness (cIMT) and epicardial fat thickness (EFT) were defined. Circulation of UII levels was determined via ELISA. RESULTS Both active and controlled acromegalic subjects showed a significant elevation of circulating levels of UII with respect to controls. There was no remarkable difference in circulating levels of UII between active and controlled acromegalic groups. Both cIMT and EFT were remarkably increased in acromegaly subjects comparing to controls. UII positively correlated with cIMT, EFT, BMI, and HOMA-IR. There was no correlation between UII and GH, insulin-like growth factor-1. According to the results obtained from regression models, UII levels independently predicted cIMT and EFT. CONCLUSION Elevated UII levels are associated with severity of cardiovascular risk factors including cIMT and EFT in acromegalic subjects.
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Affiliation(s)
- M Demirpence
- Division of Endocrinology and Metabolism, Department of Internal Medicine, Izmir Tepecik Training and Research Hospital, Tepecik, 35120, Izmir, Turkey
| | - A Guler
- Department of Family Physician, Izmir Bozyaka Training and Research Hospital, Bozyaka, 35170, Izmir, Turkey
| | - H Yilmaz
- Division of Endocrinology and Metabolism, Department of Internal Medicine, Izmir Tepecik Training and Research Hospital, Tepecik, 35120, Izmir, Turkey
| | - A Sayin
- Department of Cardiology, Izmir Tepecik Research and Training Hospital, Tepecik, 35120, Izmir, Turkey
| | - Y Pekcevik
- Department of Radiology, Izmir Tepecik Training and Research Hospital, Tepecik, 35120, Izmir, Turkey
| | - H Turkon
- Department of Medical Biochemistry, Faculty of Medicine, Canakkale Onsekiz Mart University, 17120, Canakkale, Turkey
| | - A Colak
- Department of Clinical Biochemistry, Izmir Tepecik Training and Research Hospital, Tepecik, 35120, Izmir, Turkey
| | - E M Ari
- Department of Clinical Biochemistry, Izmir Tepecik Training and Research Hospital, Tepecik, 35120, Izmir, Turkey
| | - B Aslanipour
- Department of Bioengineering, Faculty of Engineering, Ege University, Bornova, 35100, Izmir, Turkey
| | - G U Kocabas
- Division of Endocrinology and Metabolism, Department of Internal Medicine, Izmir Bozyaka Training and Research Hospital, Bozyaka, 35170, Izmir, Turkey
| | - M Calan
- Division of Endocrinology and Metabolism, Department of Internal Medicine, Izmir Bozyaka Training and Research Hospital, Bozyaka, 35170, Izmir, Turkey.
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10
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Sade LE, Colak A, Ciftci O, Can U, Kibaroglu S, Ozin B, Muderrisoglu H. P851Left atrial mechanics predict atrial fibrillation in patients after cryptogenic stroke. Eur Heart J 2018. [DOI: 10.1093/eurheartj/ehy564.p851] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Affiliation(s)
- L E Sade
- Baskent University, Faculty of Medicine, Ankara, Turkey
| | - A Colak
- Baskent University, Faculty of Medicine, Ankara, Turkey
| | - O Ciftci
- Baskent University, Faculty of Medicine, Ankara, Turkey
| | - U Can
- Baskent University, Faculty of Medicine, Ankara, Turkey
| | - S Kibaroglu
- Baskent University, Faculty of Medicine, Ankara, Turkey
| | - B Ozin
- Baskent University, Faculty of Medicine, Ankara, Turkey
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11
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Ocek L, Tarhan H, Uludağ Fİ, Sarıteke A, Köse C, Colak A, Zorlu F, Zorlu Y. Evaluation of sex hormones and sperm parameters in male epileptic patients. Acta Neurol Scand 2018; 137:409-416. [PMID: 29315457 DOI: 10.1111/ane.12892] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/11/2017] [Indexed: 11/30/2022]
Abstract
OBJECTIVES The aim of this study was to investigate the effect of carbamazepine (CBZ) and sodium valproate (VPA) monotherapy on sexual functions, sex hormones, and semen analysis and quality in male patients with epilepsy. METHODS A total of 59 male patients with epilepsy, of which 30 were on VPA monotherapy and 29 were on CBZ monotherapy, were included in the study between January 2015 and March 2016. A control group was established with 30 healthy males. Luteinizing hormone (LH), follicle-stimulating hormone (FSH), prolactin (PRL), free testosterone (fT), estradiol (E2), sex hormone-binding globulin (SHBG) levels and bioactive testosterone (BAT)/bioactive estradiol (BAE), and BAT/LH ratio were studied in groups. All groups received semen analysis and International Index of Erectile Function Scale (IIEF-5) test for erectile dysfunction. RESULTS E2 and DHEAS levels were higher in VPA and CBZ groups compared to control group (P < .001, P = .014). The decrease in fT levels in the VPA group was statistically significant (P = .038). No significant difference was detected in levels of SHBG, LH, and FSH (P > .05). BAT/BAE ratios were low both in VPA and CBZ groups (P < .001; P < .001), while BAT/LH ratios were low only in CBZ group (P = .033). In semen analysis, semen volume and number of normal sperms were found to be significantly lower in patients receiving antiepileptic drugs compared to control group (P < .05). There were no differences between the groups in rates of abnormal sperm morphology. IIEF-5 scores were found to be significantly lower in VPA and CBZ groups (P < .001). CONCLUSION VPA or CBZ therapy may lead to dysregulation of sex hormones, sexual dysfunction, and alterations in semen analysis in male patients with epilepsy. This must be considered for the selection of antiepileptic drugs in young male patients.
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Affiliation(s)
- L. Ocek
- Department of Neurology; Usak University Education and Research Hospital; Usak Turkey
| | - H. Tarhan
- Department of Urology; Sitki Kocaman University; Mugla Turkey
| | - F. İ. Uludağ
- Department of Neurology; University of Health Sciences Tepecik Education and Research Hospital; Izmir Turkey
| | - A. Sarıteke
- Department of Neurology; University of Health Sciences Tepecik Education and Research Hospital; Izmir Turkey
| | - C. Köse
- Department of IVF Unit; University of Health Sciences Tepecik Education and Research Hospital; Izmir Turkey
| | - A. Colak
- Department of Medical Biochemistry; University of Health Sciences Tepecik Education and Research Hospital; Izmir Turkey
| | - F. Zorlu
- Department of Urology; University of Health Sciences Tepecik Education and Research Hospital; Izmir Turkey
| | - Y. Zorlu
- Department of Neurology; University of Health Sciences Tepecik Education and Research Hospital; Izmir Turkey
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12
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Kaya S, Merhan O, Kacar C, Colak A, Bozukluhan K. Determination of ceruloplasmin, some other acute phase proteins, and biochemical parameters in cows with endometritis. Vet World 2016; 9:1056-1062. [PMID: 27847413 PMCID: PMC5104712 DOI: 10.14202/vetworld.2016.1056-1062] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2016] [Accepted: 08/22/2016] [Indexed: 11/18/2022] Open
Abstract
Aim: The aim of this study is to determine serum ceruloplasmin levels in cows with endometritis of varying degrees of severity and to establish whether or not there is a correlation between acute phase protein (APP) levels and biochemical parameters. Material and Methods: The study was conducted with 100 Brown Swiss cows (3-8 years of age) on days 28-32 postpartum. Cows were divided into endometritis (mild, moderate, and severe endometriosis) and healthy groups based on ultrasonography, vaginoscopy, and cytological examination. Blood samples were collected from all cows. Levels of haptoglobin (Hp), serum amyloid A (SAA), ceruloplasmin, albumin, and some biochemical parameters were analyzed. Results: Hp, SAA, and ceruloplasmin levels were higher in cows with endometritis than in healthy cows (p=0.001), and the levels of these APPs increased as endometritis became more severe (p=0.001). Some significant correlations were found between APPs and the biochemical parameters that were analyzed. In conclusion, it was determined that ceruloplasmin levels increase significantly in the presence of endometritis and proportionate to the severity of endometritis. A significant correlation was found between ceruloplasmin levels and Hp and SAA levels. Conclusion: It was concluded that ceruloplasmin levels can be used in the diagnosis of endometritis as an alternative to Hp and SAA levels.
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Affiliation(s)
- S Kaya
- Department of Obstetrics and Gynecology, Faculty of Veterinary Medicine, University of Kafkas, Kars, Turkey
| | - O Merhan
- Department of Biochemistry, Faculty of Veterinary Medicine, University of Kafkas, Kars, Turkey
| | - C Kacar
- Department of Obstetrics and Gynecology, Faculty of Veterinary Medicine, University of Kafkas, Kars, Turkey
| | - A Colak
- Department of Obstetrics and Gynecology, Faculty of Veterinary Medicine, University of Ataturk, Erzurum, Turkey
| | - K Bozukluhan
- Department of Veterinary Health, Kars School of Higher Vocational Education, University of Kafkas, Kars, Turkey
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13
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Demirpence M, Yasar HY, Colak A, Akinci B, Yener S, Toprak B, Karademirci I. MEAN PLATELET VOLUME AND PLATELET FUNCTION ANALYSIS IN ACROMEGALIC PATIENTS BEFORE AND AFTER TREATMENT. Acta Endocrinol (Buchar) 2016; 12:401-406. [PMID: 31149122 DOI: 10.4183/aeb.2016.401] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Objective Mean platelet volume (MPV) and platelet function analysis have been studied before in acromegaly, but the effect of treatment on both parameters has not been evaluated. We aimed to investigate MPV and platelet function analysis in acromegalic patients after six-months of treatment. Methods Forty patients with active acromegaly and 36 healthy subjects were included in the study. Plasma glucose and lipids, fibrinogen, GH, IGF-1 levels, MPV and platelet function analysis were measured. All patients with acromegaly were re-evaluated six months after treatment. Results Fasting blood glucose (FBG), GH, IGF-1, fibrinogen levels and MPV values were significantly higher in acromegalic group compared with the control. Platelet function was enhanced significantly (pcol-ADP: 0.002, pcolepinephrine: 0.002). After 6 months of treatment FBG, serum GH, IGF-1, fibrinogen and MPV decreased and collagen/ADP- and collagen/epinephrine-closure times (CT) were increased. Acromegalic patients that were in remission with long-acting SSA after surgery had significantly higher fibrinogen levels and MPV and decreased collagen/epinephrine-CT with respect to the controls (pfibrinogen: 0.001, pMPV: 0.026, pcol-epinephrine: 0.037). Conclusion Acromegaly was associated with increased MPV and enhanced platelet activity. Although growth hormone hypersecretion was controlled by surgery and medical treatment, these parameters did not improve - indicating a still increased risk for cardiovascular events.
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Affiliation(s)
- M Demirpence
- Tepecik Research and Training Hospital, Dept. of Endocrinology, Izmir, Turkey
| | - H Y Yasar
- Tepecik Research and Training Hospital, Dept. of Endocrinology, Izmir, Turkey
| | - A Colak
- Tepecik Research and Training Hospital, Dept. of Biochemistry, Izmir, Turkey
| | - B Akinci
- Dokuz Eylul University Hospital, Dept. of Endocrinology, Aydin, Turkey
| | - S Yener
- Dokuz Eylul University Hospital, Dept. of Endocrinology, Aydin, Turkey
| | - B Toprak
- Tepecik Research and Training Hospital, Dept. of Biochemistry, Izmir, Turkey
| | - I Karademirci
- Tepecik Research and Training Hospital, Dept. of Biochemistry, Izmir, Turkey
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Turkon H, Yalcın H, Toprak B, Demirpençe M, Yaşar HY, Colak A. Correlation between Bethatrophin and 25(OH)D Concentrations in a Group of Subjects With Normal and Impaired Glucose Metabolism. Exp Clin Endocrinol Diabetes 2016; 125:147-150. [PMID: 26910534 DOI: 10.1055/s-0042-101791] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
Aim: Inducing beta cell replication is a potential therapeutic approach for the treatment of diabetes mellitus. Recently betatrophin was suggested as a novel stimulator of beta cell proliferation in mice but its role in humans remains to be established. We aimed to investigate betatrophin concentration and its association with metabolic parameters in a group of individuals with normal glucose tolerance, pre-diabetes and diabetes mellitus who had not been previously treated. Methods: A total of 72 subjects were recruited for this cross sectional study: 23 subjects with normal glucose tolerance (NGT), 22 subjects with prediabetes, and 27 subjects with diabetes mellitus (DM). Circulating betatrophin concentration, 75 g oral glucose tolerance test, fasting insulin, glycosylated hemoglobin, 25hydroxy vitamin D and HOMA IR were measured. Results: The difference in betatrophin values did not reach statistical significance between the 3 groups [NGT:206 (176-297)pg/mL, Prediabetes:232 (181-254)pg/mL, DM:245 (205-526)pg/mL, p=0.078]. Betatrophin was negatively significantly correlated with BMI and positively significantly correlated with 25(OH)vitD (p=0.043 and p=0.001 respectively). Multivariate linear regression showed that 25(OH) vitD (β=0.440 p=0.001) and fasting glucose (β=0.003 p=0.038) were variables associated with betatrophin concentration (R2=0.251). Conclusions: In a group of subjects ranging from those with normal glucose tolerance to newly diagnosed diabetes, we found that 25(OH)D and fasting glucose were factors associated with serum betatrophin concentration.
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Affiliation(s)
- H Turkon
- Department of Medical Biochemistry, Çanakkale Onsekiz Mart University, Faculty of Medicine, Çanakkale, Turkey
| | - H Yalcın
- Department of Clinical Biochemistry, Tepecik Teaching and Research Hospital, Izmir, Turkey
| | - B Toprak
- Department of Clinical Biochemistry, Silopi State Hospital, Sırnak, Turkey
| | - M Demirpençe
- Department of Endocrinology, Tepecik Teaching and Research Hospital Izmir, Turkey
| | - H Y Yaşar
- Department of Endocrinology, Tepecik Teaching and Research Hospital Izmir, Turkey
| | - A Colak
- Department of Clinical Biochemistry, Tepecik Teaching and Research Hospital, Izmir, Turkey
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Colak A, Yılmaz H, Temel Y, Demirpence M, Simsek N, Karademirci İ, Bozkurt U, Yasar E. Coagulation parameters and platelet function analysis in patients with acromegaly. J Endocrinol Invest 2016; 39:97-101. [PMID: 26048595 DOI: 10.1007/s40618-015-0300-0] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/25/2015] [Accepted: 04/24/2015] [Indexed: 10/23/2022]
Abstract
OBJECTIVE Acromegaly is associated with increased cardiovascular morbidity and mortality. The data about the evaluation of coagulation and fibrinolysis in acromegalic patients are very limited and to our knowledge, platelet function analysis has never been investigated. So, we aimed to investigate the levels of protein C, protein S, fibrinogen, antithrombin 3 and platelet function analysis in patients with acromegaly. METHODS Thirty-nine patients with active acromegaly and 35 healthy subjects were included in the study. Plasma glucose and lipid profile, fibrinogen levels, GH and IGF-1 levels and protein C, protein S and antithrombin III activities were measured in all study subjects. Also, platelet function analysis was evaluated with collagen/ADP and collagen-epinephrine-closure times. RESULTS Demographic characteristics of the patient and the control were similar. As expected, fasting blood glucose levels and serum GH and IGF-1 levels were significantly higher in the patient group compared with the control group (pglc: 0.002, pGH: 0.006, pIGF-1: 0.001, respectively). But lipid parameters were similar between the two groups. While serum fibrinogen and antithrombin III levels were found to be significantly higher in acromegaly group (p fibrinogen: 0.005 and pantithrombin III: 0.001), protein S and protein C activity values were significantly lower in the patient group (p protein S: 0.001, p protein C: 0.001). Also significantly enhanced platelet function (measured by collagen/ADP- and collagen/epinephrine-closure times) was demonstrated in acromegaly (p col-ADP: 0.002, p col-epinephrine: 0.002). The results did not change, when we excluded six patients with type 2 diabetes in the acromegaly group. There was a negative correlation between serum GH levels and protein S (r: -0.25, p: 0.04)) and protein C (r: -0.26, p: 0.04) values. Likewise, there was a negative correlation between IGF-1 levels and protein C values (r: -0.39, p: 0.002), protein S values (r: -0.39, p: 0.001), collagen/ADP-closure times (r: -0.28, p: 0.02) and collagen/epinephrine-closure times (r:-0.26, p: 0.04). Also, we observed a positive correlation between IGF-1 levels and fibrinogen levels (r: 0.31, p: 0.01). CONCLUSION Acromegaly was found to be associated with increased tendency to coagulation and enhanced platelet activity. This hypercoagulable state might increase the risk for cardiovascular and cerebrovascular events in acromegaly.
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Affiliation(s)
- A Colak
- Department of Biochemistry, Tepecik Research and Training Hospital, Izmir, Turkey
| | - H Yılmaz
- Department of Endocrinology, Tepecik Research and Training Hospital, Izmir, Turkey.
| | - Y Temel
- Department of Biochemistry, Tepecik Research and Training Hospital, Izmir, Turkey
| | - M Demirpence
- Department of Endocrinology, Tepecik Research and Training Hospital, Izmir, Turkey
| | - N Simsek
- Department of Biochemistry, Tepecik Research and Training Hospital, Izmir, Turkey
| | - İ Karademirci
- Department of Biochemistry, Tepecik Research and Training Hospital, Izmir, Turkey
| | - U Bozkurt
- Department of Biochemistry, Tepecik Research and Training Hospital, Izmir, Turkey
| | - E Yasar
- Department of Anaesthesiology, Bozyaka Research and Training Hospital, Izmir, Turkey
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Polat B, Cengiz M, Cannazik O, Colak A, Oruc E, Altun S, Salar S, Bastan A. Endometrial echotexture variables in postpartum cows with subclinical endometritis. Anim Reprod Sci 2015; 155:50-5. [PMID: 25721562 DOI: 10.1016/j.anireprosci.2015.01.015] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2014] [Revised: 01/24/2015] [Accepted: 01/30/2015] [Indexed: 11/29/2022]
Abstract
The aim of this study was to evaluate endometrial echotexture changes on ultrasonographic digital images during subclinical endometritis using a computer-assisted image analysis program. Endometrial samples were collected from 140 Brown Swiss cows (days in milk = 35 ± 3) using a cytobrush method and classified as having a non-inflamed uterus (n = 66) and uterus with acute (n = 42), subacute (n = 21), and chronic (n = 11) inflammations. The mean cellular infiltration density was 0%, 31 ± 5%, 37 ± 6%, and 16 ± 8% for cows with non-inflamed uterus and cows with acute, subacute, and chronic uterine inflammations (P < 0.0001). As the cell infiltration density increased, both cervical diameter and mean gray level did not change. There were a liner decrease in homogeneity and a linear increase in contrast in response to increased cellular infiltration density. The sensitivity and specificity were 79.73% and 46.97% for the homogeneity value and 59.46% and 69.70% for the contrast value, respectively. In conclusion, monitoring endometrial echotexture alterations, especially homogeneity and contrast, changed depending on the cellular density and inflammation status and may be potential diagnostic markers for subclinical endometritis in cows.
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Affiliation(s)
- B Polat
- Department of Obstetrics Gynecology, Faculty of Veterinary Medicine, Atatürk University, 25240 Erzurum, Turkey.
| | - M Cengiz
- Department of Obstetrics Gynecology, Faculty of Veterinary Medicine, Atatürk University, 25240 Erzurum, Turkey
| | - O Cannazik
- Department of Obstetrics Gynecology, Faculty of Veterinary Medicine, Atatürk University, 25240 Erzurum, Turkey
| | - A Colak
- Department of Obstetrics Gynecology, Faculty of Veterinary Medicine, Atatürk University, 25240 Erzurum, Turkey
| | - E Oruc
- Department of Pathology, Faculty of Veterinary Medicine, Atatürk University, 25240 Erzurum, Turkey
| | - S Altun
- Department of Pathology, Faculty of Veterinary Medicine, Atatürk University, 25240 Erzurum, Turkey
| | - S Salar
- Department of Obstetrics & Gynecology, Faculty of Veterinary Medicine, Ankara University, 06110 Ankara, Turkey
| | - A Bastan
- Department of Obstetrics & Gynecology, Faculty of Veterinary Medicine, Ankara University, 06110 Ankara, Turkey
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Dikmen ZG, Colak A, Dogan P, Tuncer S, Akbiyik F. Diagnostic performances of CA125, HE4, and ROMA index in ovarian cancer. EUR J GYNAECOL ONCOL 2015; 36:457-462. [PMID: 26390703] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
PURPOSE OF INVESTIGATION HE4 (human epididymis protein 4) is suggested to be used as a potential new biomarker to identify ovarian malignancies from benign adnexal masses. The aim of this study was to evaluate HE4, in comparison with CA125 and Risk of Ovarian Malignancy Algorithm (ROMA) index in benign gynecological diseases and ovarian cancer, and additionally to determine the reference range for HE4 in healthy Turkish women. MATERIALS AND METHODS CA125 and HE4 serum levels were determined in 96 patients with benign gynecological diseases, 47 patients with ovarian cancer and 106 healthy women using a specific analyzer. CA125 and HE4 cut-offs were 35 U/ml and 70 pmol/L, respectively. RESULTS HE4 had significantly higher concentrations in ovarian cancer than benign gynecologic disorders (p < 0.005). Tumor marker sensitivity in ovarian cancer was 78% for HE4, 63% for CA125, and 88% for ROMA index at 95% specificity. A significantly higher area under the Receiver operator characteristic (ROC) curve was obtained with HE4 and ROMA index than CA125 in the differential diagnosis of benign gynecological diseases versus ovarian cancer (0.929, 0.955, and 0.781, respectively). Reference limits for serum HE4 in healthy Turkish women was determined as 28.9-62.4 pmol/L for pre-menopausal and 23.7-152.4 pmol/L for postmenopausal women. CONCLUSIONS In the diagnosis of ovarian cancer, HE4 had higher sensitivity, as a single tumor marker. The sensitivity of HE4 and ROMA index in postmenopausal women was higher than premenopausal women for detecting ovarian cancer.
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Konak L, Kolcuoğlu Y, Ozbek E, Colak A, Ergenoglu B. Purification and characterization of an extremely stable glucose isomerase from Geobacillus thermodenitrificans TH2. Prikl Biokhim Mikrobiol 2014; 50:34-38. [PMID: 25272749] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
The D-glucose/D-xylose isomerase was purified from a thermophilic bacterium, Geobacillus thermodenitrificans TH2, by precipitating with heat shock and using Q-Sepharose ion exchange column chromatography, and then characterized. The purified enzyme had a single band having molecular weight of 49 kDa on SDS-PAGE. In the presence of D-glucose as a substrate, the optimum temperature and pH of the enzyme were found to be 80 degrees C and 7.5, respectively. The purified xylose isomerase of G. thermodenitrificans TH2 was extremely stable at pH 7.5 after 96 h incubation at 4 degrees C and 50 degrees C. When the thermal stability profile was analyzed, it was determined that the purified enzyme was extremely stable during incubation periods of 4 months and 4 days at 4 degrees C and 50 degrees C, respectively. The K(m) and V(max) values of the purified xylose isomerase from G. thermodenitrificans TH2 were calculated as 32 mM and 4.68 micromol/min per mg of protein, respectively. Additionally, it was detected that some metal ions affected the enzyme activity at different ratios. The enzyme was active and stable at high temperatures and nearly neutral pHs which are desirable for the usage in the food and ethanol industry.
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Konak L, Kolcuoğlu Y, Ozbek E, Colak A, Ergenoglu B. Purification and characterization of an extremely stable glucose isomerase from Geobacillus thermodenitrificans TH2. APPL BIOCHEM MICRO+ 2013. [DOI: 10.1134/s0003683814010062] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Sensoy B, Ozeke O, Canpolat U, Colak A, Grbovic E, Cay S, Topaloglu S, Aras D, Aydogdu S. Phase-4 paroxysmal atrioventricular block in sarcoidosis. Herz 2013; 40:321-4. [PMID: 24297398 DOI: 10.1007/s00059-013-4002-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2013] [Revised: 09/16/2013] [Accepted: 09/26/2013] [Indexed: 11/28/2022]
Affiliation(s)
- B Sensoy
- Department of Cardiology, Turkiye Yuksek Ihtisas Hospital, 06100, Ankara, Turkey
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Toprak B, Yalcın HZ, Colak A. Vitamin B12 and folate deficiency: should we use a different cutoff value for hematologic disorders? Int J Lab Hematol 2013; 36:409-14. [DOI: 10.1111/ijlh.12158] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2013] [Accepted: 09/12/2013] [Indexed: 12/21/2022]
Affiliation(s)
- B. Toprak
- Department of Clinical Biochemistry; Tepecik Training and Research Hospital; Izmir Turkey
| | - H. Z. Yalcın
- Department of Clinical Biochemistry; Tepecik Training and Research Hospital; Izmir Turkey
| | - A. Colak
- Department of Clinical Biochemistry; Tepecik Training and Research Hospital; Izmir Turkey
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Colak A, Akan G, Oncu F, Yanbay H, Acar S, Yesilbursa D, Turkcan S, Atalar F. 1508 – Association study of the dio2 gene as a susceptibility candidate for schizophrenia in the turkish population; a case-control study. Eur Psychiatry 2013. [DOI: 10.1016/s0924-9338(13)76526-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
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Akan G, Ozgen O, Colak A, Acar S, Oncu F, Yesilbursa D, Turkcan S, Atalar F. 1043 – Expression of obesity related genes and leptin serum levels are decreased in turkish schizophrenia patients, case-control study. Eur Psychiatry 2013. [DOI: 10.1016/s0924-9338(13)76166-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/26/2022] Open
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Affiliation(s)
- K Ahmad Saliba
- Department of Laboratory Medicine and Pathology, University of Alberta, Edmonton, Canada
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Agaoglu A, Schäfer-Somi S, Kaya D, Kucukaslan I, Emre B, Gultiken N, Mulazımoglu B, Colak A, Aslan S. The intravaginal application of misoprostol improves induction of abortion with aglepristone. Theriogenology 2011; 76:74-82. [DOI: 10.1016/j.theriogenology.2011.01.019] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2010] [Revised: 01/11/2011] [Accepted: 01/14/2011] [Indexed: 10/18/2022]
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Unlu Y, Colak A, Keskin O, Kaya U. PP-084: AORTO-BIAXILLARY BYPASS VIA MINI STERNOTOMY IN A PATIENT WITH TAKAYASU ARTERITIS. Int J Cardiol 2011. [DOI: 10.1016/s0167-5273(11)70346-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Unlu Y, Colak A, Calik E, Godekmerdan E, Tort M, Gundogdu F, Kocak H. PP-301: ACCESS SITE COMPLICATIONS AFTER PERCUTANEOUS CARDIAC INTERVENTIONS. Int J Cardiol 2011. [DOI: 10.1016/s0167-5273(11)70459-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Polat B, Colak A, Cengiz M, Yanmaz L, Oral H, Bastan A, Kaya S, Hayirli A. Sensitivity and specificity of infrared thermography in detection of subclinical mastitis in dairy cows. J Dairy Sci 2010; 93:3525-32. [DOI: 10.3168/jds.2009-2807] [Citation(s) in RCA: 79] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2009] [Accepted: 04/02/2010] [Indexed: 11/19/2022]
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Colak A, Antar V, Karaoğlan A, Akdemir O, Sahan E, Celik O, Sağmanligil A. Q-VD-OPh, a pancaspase inhibitor, reduces trauma-induced apoptosis and improves the recovery of hind-limb function in rats after spinal cord injury. Neurocirugia (Astur) 2009; 20:533-540. [PMID: 19967318] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
BACKGROUND Various caspases have been implicated in the development of secondary damage after spinal cord injury (SCI). Anticaspase therapy that targets only one caspase has been investigated in a variety of in vitro and in vivo studies. This study examined the neuroprotective effects of Q-VD-OPh, a pan-caspase inhibitor, in a rat model of SCI. METHODS Thirty Wistar albino rats were divided into 3 groups of 10 each: the sham-operated controls (group 1), the trauma-created controls (group 2), and the QVD- OPh-treated rats (group 3). An SCI (a trauma of 40 g-cm) was produced at the thoracic level (T8-T10) by the weight-drop technique. The response to injury and the neuroprotective effects of Q-VD-OPh were investigated by histopathologic examination and terminal deoxynucleotidyl transferase dUTP nick-end labeling (TUNEL) 24 hours and 5 days after trauma. The inclined plane technique of Rivlin and Tator and a modified version of Tarlov's grading scale were used to assess the functional status of the rats 24 hours, 3 days, and 5 days after injury. RESULTS Twenty-four hours after trauma, light microscopic examination of a specimen taken from group 2 rats revealed hemorrhage, necrosis, vascular thrombi, and edema. Group 3 tissue samples showed similar features at that time. Twenty-four hours after trauma, the mean apoptotic cell number was 4.47 +/- 0.35 cells in group 2 and 1.58 +/- 0.33 in group 3. Five days after injury, the mean apoptotic cell count was 4.35 +/- 0.47 in group 2 and 1.25 +/- 0.34 in group 3. Thus the number of TUNEL-positive cells in an injured spinal cord was greatly reduced by treatment with Q-VDOPh. The neurologic function scores (both the inclined plane performance and motor grading scores) were significantly better in the Q-VD-OPh-treated group than in the trauma-created control group. CONCLUSION The marked antiapoptotic properties of Q-VD-OPh due to the inhibition of all caspases render it a promising novel agent. A therapeutic strategy using Q-VD-OPh may eventually lead to the effective treatment of SCI in humans.
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Affiliation(s)
- A Colak
- Department of Neurosurgery, Maltepe University, School of Medicine, Istanbul, Turkey.
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Colak A, Soy O, Karaoglan A, Akdemir O, Kokturk S, Sagmanligil A, Tasyurekli M. Effects of GYKI 52466 on Early Vasospasm in Rats. ACTA ACUST UNITED AC 2009; 70:187-94. [DOI: 10.1055/s-0029-1202357] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Colak A, Kaya M, Karaoğlan A, Sağmanligil A, Akdemir O, Sahan E, Celik O. Calpain inhibitor AK 295 inhibits calpain-induced apoptosis and improves neurologic function after traumatic spinal cord injury in rats. Neurocirugia (Astur) 2009; 20:245-254. [PMID: 19575128] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
BACKGROUND An increase in the level of intracellular calcium activates the calcium-dependent neutral protease calpain, which in turn leads to cellular dysfunction and cell death after an insult to the central nervous system. In this study, we evaluated the effect of a calpain inhibitor, AK 295, on spinal cord structure, neurologic function, and apoptosis after spinal cord injury (SCI) in a murine model. METHODS Thirty albino Wistar rats were divided into 3 groups of 10 each: the sham-operated control group (group 1), the spinal cord trauma group (group 2), and the spinal cord trauma plus AK 295 treatment group (group 3). After having received a combination of ketamine 60 mg/kg and xylazine 9 mg/kg to induce anesthesia, the rats in groups 2 and 3 were subjected to thoracic trauma by the weight drop technique (40 g-cm). One hour after having been subjected to that trauma, the rats in groups 2 and 3 were treated with an intraperitoneal injection of either dimethyl sulfoxide 2 mg/kg or AK 295 2 mg/kg. The effects of the injury and the efficacy of AK 295 were determined by an assessment of the TUNEL technique and the results of examination with a light microscope. The neurologic performance of 5 rats from group 2 and 5 from group 3 was assessed by means of the inclined plane technique and the modified Tarlov's motor grading scale 1, 3, and 5 days after spinal cord trauma. FINDINGS Light-microscopic examination of spinal cord specimens from group 2 revealed hemorrhage, edema, necrosis, and vascular thrombi 24 hours after trauma. Similar (but less prominent) features were seen in specimens obtained from group 3 rats. Twenty-four hours after injury, the mean apoptotic cell numbers in groups 1 and 2 were zero and 4.57 +/- 0.37 cells, respectively. In group 3, the mean apoptotic cell number was 2.30 +/- 0.34 cells, a value significantly lower than that in group 2 (P < .05). Five days after trauma, the injured rats in group 2 demonstrated significant motor dysfunction (P < .05). In comparison, the motor scores exhibited by group 3 rats were markedly better (P < .05). CONCLUSIONS AK 295 inhibited apoptosis via calpaindependent pathways and provided neuroprotection and improved neurologic function in a rat model of SCI. To our knowledge, this is the first study to evaluate the use of AK 295, a calpain inhibitor, after SCI. Our data suggest that AK 295 might be a novel therapeutic compound for the neuroprotection of tissue and the recovery of function in patients with a SCI.
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Affiliation(s)
- A Colak
- Department of Neurosurgery, Maltepe University, School of Medicine, Istanbul, Turkey
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Colak A, Kaya M, Karaoglan A, Sagmanligil A, Akdemir O, Sahan E, Celik O. Calpain inhibitor AK 295 inhibits calpain-induced apoptosis and improves neurologic function after traumatic spinal cord injury in rats. Neurocirugia (Astur) 2009. [DOI: 10.4321/s1130-14732009000300002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Colak A, Polat B, Okumus Z, Kaya M, Yanmaz L, Hayirli A. Short Communication: Early Detection of Mastitis Using Infrared Thermography in Dairy Cows. J Dairy Sci 2008; 91:4244-8. [DOI: 10.3168/jds.2008-1258] [Citation(s) in RCA: 78] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Kutlay M, Colak A, Simsek H, Yildiz S, Topuz K, Kaya S, Cetinkal A, Demircan M. Antibiotic and hyperbaric oxygen therapy in the management of post-operative discitis. Undersea Hyperb Med 2008; 35:427-440. [PMID: 19175198] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
OBJECTIVE Despite the use of antibiotics, the management of postoperative discitis (POD) still presents a challenge. This study was designed to evaluate the effect of adjuvant hyperbaric oxygen (HBO2) therapy on the duration of antibiotic treatment. METHODS Between 1999 and 2004, 22 patients diagnosed with POD were treated with antibiotic and HBO2 therapy. There were 14 male (63.6%) and 8 female (36.3%) patients, and their mean age at the time of surgery was 45.4 years (range, 20-59 years). Diagnosis of a POD was established on the basis of clinical, laboratory, and radiographic findings. All patients were given a 4-week course of vancomycin (1g i.v. every 12 h). Additionally, patients received HBO2 (100% O2 at 2.4 ATA for 90 min) twice daily for the initial five consecutive days, and an additional treatment (100% O2 at 2.4 ATA for 90 min daily) was given for 25 days. The duration of follow-up was 24 months. RESULTS This treatment modality allowed infection control and healing for all 22 patients with 0% recurrence rate. HBO2 treatment was tolerated well. CONCLUSION This series represents the first reported group of POD patients treated with antibiotic and HBO2 therapy. Our preliminary results indicate that the length of time on antibiotic therapy can be shortened with the use of HBO2 as an adjunctive treatment. Erythrocyte sedimentation rates and serum C-reactive protein levels returned to the preoperative levels earlier (within 8-30 days after the initiation of treatment) and a reasonable length of immobility was obtained (mean 12.2 days). After completion of the one-month period of antibiotic and HBO2 therapy, patients were accepted disease-free regarding pain and mobility.
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Affiliation(s)
- M Kutlay
- GATA Military Medical Academy Haydarpaşa Training Hospital, Department of Neurosurgery, Istanbul, Turkey
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Sahin HS, Inal M, Alagol A, Colak A, Arar C, Basmergen T, Gunday I, Turan N. 788. The Effect of the Spinal Anesthesia on Pulmonary Function Tests in Chronic Obstructive Pulmonary Disease: Levobupivacaine Versus Bupivacaine. Reg Anesth Pain Med 2008. [DOI: 10.1136/rapm-00115550-200809001-00079] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Ayaz F, Demir O, Torun H, Kolcuoglu Y, Colak A. Characterization of polyphenoloxidase (PPO) and total phenolic contents in medlar (Mespilus germanica L.) fruit during ripening and over ripening. Food Chem 2008. [DOI: 10.1016/j.foodchem.2007.05.096] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Arar C, Colak A, Alagol A, Uzer SS, Ege T, Turan N, Duran E, Pamukcu Z. The use of esmolol and magnesium to prevent haemodynamic responses to extubation after coronary artery grafting. Eur J Anaesthesiol 2007; 24:826-31. [PMID: 17583595 DOI: 10.1017/s0265021507000865] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
BACKGROUND AND OBJECTIVE The haemodynamic responses during extubation can cause complications after open-heart surgery. In this study, we aimed to examine the effect of esmolol and magnesium before extubation on these haemodynamic responses. METHODS Following the approval of local Ethics Committee, 120 patients having coronary artery bypass grafting with extubation in the intensive care unit were included in the study. Patients were allocated to receive esmolol 1 mg kg-1 (group I, n = 40), magnesium 30 mg kg-1 (Group II, n = 40) or normal saline (Group III, n = 40). Study medication was administered as a 20-min infusion in a volume of 20 mL. Patients were extubated just after termination of the infusion. Heart rate, blood pressure and central venous pressure were recorded prior to drug administration, before extubation, during extubation and 1 min after extubation. RESULTS Heart rate was lower in Group I than in Groups II (P < 0.05) and III (P < 0.001) and lower in Group II than in Group III (P < 0.05) during extubation. It was also lower in Group I than in Group III (P < 0.05) after extubation. Systolic blood pressure was lower in Group I than in Groups II and III (P < 0.001) during extubation. Diastolic blood pressure was higher in Group III than in Groups I and II during extubation (P < 0.001) and after extubation (P < 0.05). Mean arterial pressure was lower in Group I than in Groups II and III (P < 0.001) during extubation, lower in Group II than in Group III (P < 0.05) during extubation and lower in Group I than in Group III (P < 0.05) after extubation. CONCLUSION We found that using esmolol before extubation following coronary artery bypass graft surgery prevents undesirable haemodynamic responses while magnesium reduces undesirable haemodynamic responses but does not prevent them.
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Affiliation(s)
- C Arar
- Trakya University Medical Faculty, Department of Anesthesiology, Edirne, Turkey
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Erkut B, Unlü Y, Kaygin MA, Colak A, Erdem AF. Iatrogenic vascular injury during to lumbar disc surgery. Acta Neurochir (Wien) 2007; 149:511-5; discussion 516. [PMID: 17387429 DOI: 10.1007/s00701-007-1132-2] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2006] [Accepted: 02/19/2007] [Indexed: 11/25/2022]
Abstract
We report two patients who sustained vascular injury while undergoing intervertebral disc surgery at the lumbar four and five level. Each patient suffered from massive bleeding and shock, urgent laparatomy was performed, and the vascular injuries were successfully primarily repaired. The experience prompted us to review reports in the literature since 1965 of vascular complications associated with surgical excision of hernia disc via a posterior approach. From our analysis, we highlight the clinical features and management, emphasising that rapid diagnosis and immediate intervention can result in a favourable outcome, as in our patients.
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Affiliation(s)
- B Erkut
- Department of Cardiovascular Surgery, Medical Faculty of Atatürk University, Erzurum, Turkey.
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Yanik FF, Kuşçu E, Eroğlu D, Kahraman I, Sürücü B, Colak A. Thecoma associated with pregnancy: a case report. EUR J GYNAECOL ONCOL 2007; 28:519-521. [PMID: 18179153] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Ovarian thecoma, which belongs to the group of sex-cord stromal tumors, is a relatively rare neoplasm. In this report we present a pregnant woman with a solid ovarian mass diagnosed during pregnancy and operated on at the 19th gestational week. At surgical exploration, torsion of the ovarian tumor was observed together with ascites and unilateral salpingo-oophorectomy was performed. Pathological examination revealed a luteinized thecoma. After the surgery, the pregnancy continued uneventfully until term.
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Affiliation(s)
- F F Yanik
- Department of Obstetrics and Gynecology, Division of Maternal-Fetal Medicine, Başkent University Faculty of Medicine, Ankara, Turkey
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Inal M, Colak A, Arar C, Gunday I. 742 A SUCCESFUL CONTINUOUS SPINAL ANESTHESIA IN A PATIENT WITH CONGESTIVE HEART FAILURE AND PULMONARY HYPERTENSION. Eur J Pain 2006. [DOI: 10.1016/s1090-3801(06)60745-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Soy O, Aslan O, Uzun H, Barut S, Iğdem AA, Belce A, Colak A. Time-level relationship for nitric oxide and the protective effects of aminoguanidine in experimental spinal cord injury. Acta Neurochir (Wien) 2004; 146:1329-35; discussion 1335-6. [PMID: 15309585 DOI: 10.1007/s00701-004-0343-z] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
BACKGROUND The secondary injury process following spinal cord trauma has been shown to involve different mechanisms such as excessive release of excitatory amino-acids, and induction of free radical induced lipid peroxidation. In this experimental study, the time-level relationship of the nitric oxide and the neuroprotective effects of aminoguanidine were investigated in a rat spinal cord trauma model. METHODS The experiments were performed on 63 Wistar albino rats divided into three groups; sham-operated control (Group 1), trauma created control (Group 2) and aminoguanidine group (Group 3). In groups 2 and 3, spinal cord trauma was produced at thoracic level by using weight the drop technique (at a severity of 50 gr-cm). After the trauma, the rats in Group 3, received an intraperitoneal injection of 100 mg/kg aminoquanidine twice a day for 3 days. The effects of the injury and the efficacy of aminoguanidine were determined based on biochemical parameters (lipid peroxidation and nitric oxide levels in tissue), and on light microscopy findings in cord tissue collected at different times post-injury. Biochemical parameters were performed one hour, three and five days after injury. Functional recovery was assessed at 3, and 5 days after cord trauma with the inclined-plane technique and Tarlov's motor grading scale. FINDINGS Although there was no statistically significant difference at the 1(st) hour, the values of the tissue nitric oxide in trauma created controls were 42% higher on the 3(rd) day and 40% higher on the 5(th) day when compared with those in sham controls. The levels of the tissue lipid peroxidation in trauma created controls were 88% higher at the 1(st) hour and 52.8% higher on the 5(th) day when compared with shame controls, but there was no meaningful difference on the 3(rd) day. In the trauma created control group, the mean motor function scores decreased to 1.16 +/- 0.40 and to 1 +/- 0 on the 3(rd) and 5(th) day, respectively. In this group the mean values of the inclined plane were 39.16 +/- 2.04 on the 3(rd) day and 37.91 +/- 1.02 on the 5(th) day. No statistically significant difference was observed in both tissue lipid peroxidation and nitric oxide levels for all time points between the aminoguanidine group and the sham-operated controls (p>0.01). The motor function scores were observed as 2.16 +/- 0.40 on the 3(rd) day and as 3 +/- 0 on the 5(th) day in aminoguanidine group. These values were significantly higher than the trauma created controls (p<0.01). Aminoguanidin treatment also improved the inclined plane performance of the rats; In this group, the mean values of the inclined plane scores were 44.58 +/- 2.92 and 52.91 +/- 1.88 on the 3(rd) and 5(th) days, respectively. These values were significantly higher than the trauma created controls (p<0.01). INTERPRETATION This study shows that the nitric oxide level does not increase in the spinal cord tissue during the first hour after the spinal cord trauma. It increases significantly in the spinal cord tissue not only three days but also five days following the trauma. Aminoguanidine treatment, which is started just after the trauma, can prevent both the nitric oxide production and lipid peroxidation in spinal cord tissue and it can improve the functional status of the animals. In this respect, aminoguanidine may have a potential role in the treatment of acute spinal cord injury.
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Affiliation(s)
- O Soy
- Department of Neurosurgery, Taksim Education and Research Hospital, Istanbul, Turkey
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Abstract
STUDY DESIGN Experimental animal model to assess ischemic spinal cord injury following occlusion of the thoraco-abdominal aorta. OBJECTIVES To measure whether melatonin administered to rabbits before and after occlusion exerts an effect on the repair of ischemia-reperfusion (IR) injury. SETTING Medical Biology Laboratory, Inonu University, Malatya, Turkey. METHODS Rabbits were divided into three IR treatment groups and one sham-operated (ShOp) control group. The three treatment groups had their infrarenal aorta temporarily occluded for 25 min, while the ShOp group had laparotomy without aortic occlusion. Melatonin was administered either 10 min before aortic occlusion or 10 min after the clamp was removed. Physiologic saline was administered to the control animals. After treatment, the animals were euthanized and lumbosacral spinal cord tissue was removed for the determination of relevant enzyme activities. RESULTS Malondialdehyde levels, indicating the extent of lipid peroxidation, were found to be significantly increased in the nonmelatonin treated (IR) group when compared to the ShOp group. Melatonin, whether given to pre- or post occlusion groups, suppressed malondialdehyde levels below that of the ShOp group. Catalase (CAT) and glutathione peroxidase (GSH-Px) enzyme activities were increased in the IR group compared to the ShOp group. Melatonin given preocclusion resulted in a significant decrease in both CAT and GSH-Px enzyme levels. The superoxide dismutase (SOD) enzyme activity was decreased in the ischemia-reperfusion treatment group. However, the melatonin treatment increased SOD enzyme activity to levels approximating that of the ShOp group. CONCLUSION To our knowledge, this is the first study that shows the effects of melatonin administered both pre- and postischemia on induced oxidative damage to injured spinal cords. Our data also expands on reports that melatonin administration may significantly reduce the incidence of spinal cord injury following temporary aortic occlusion.
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Affiliation(s)
- S F Erten
- Department of Neurosurgery, Faculty of Medicine, Inonu University, Malatya, Turkey
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Karamanlioğlu B, Arar C, Alagöl A, Colak A, Gemlik I, Süt N. Preoperative oral celecoxib versus preoperative oral rofecoxib for pain relief after thyroid surgery. Eur J Anaesthesiol 2003; 20:490-5. [PMID: 12803270 DOI: 10.1017/s0265021503000796] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
BACKGROUND AND OBJECTIVE The study compared the analgesic efficacy and safety of two preoperatively administered cyclo-oxygenase-2 inhibitors, celecoxib and rofecoxib. METHODS Ninety adult patients undergoing thyroid surgery were divided into three groups (each n = 30). They were given a single oral dose of placebo, celecoxib 200 mg or rofecoxib 50 mg 1 h before induction of anaesthesia. All patients received a standard anaesthetic. Intraoperative blood loss was measured. Pain scores, sedation scores, heart rate, mean arterial pressure and respiratory rate were noted at 0, 1, 2, 4, 6, 12 and 24 h postoperatively. Analgesic (meperidine) requirements and adverse effects were recorded during the first postoperative 24 h. RESULTS Compared with placebo, pain scores were significantly lower with rofecoxib at all time points (P < 0.05) and were significantly lower with celecoxib (P < 0.05) during the first 4 h. Pain scores were significantly lower with rofecoxib compared with celecoxib at 6, 12 and 24 h (P < 0.05). The average cumulative 24 h meperidine dose was significantly lower with both celecoxib (54.9 +/- 34.4mg) and rofecoxib (42.8 +/- 40.9 mg) compared with placebo (76.8 +/- 6.2 mg) (P < 0.01 and P < 0.001, respectively). There were no differences in the intraoperative blood loss, heart rate, mean arterial pressure, respiratory rate, sedation scores and incidence of adverse effects among groups. CONCLUSIONS The preoperative administration of rofecoxib 50 mg and less so of celecoxib 200 mg provide a significant analgesic benefit with regard to postoperative pain relief and decrease in additional opioid requirements after thyroid surgery.
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Affiliation(s)
- B Karamanlioğlu
- Trakya University Faculty of Medicine, Department of Anaesthesiology and Reanimation, Edirne, Turkey.
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Turan A, Memiş D, Karamanlioglu B, Colak A, Pamukçu Z, Turan N. Effect of aminophylline on recovery from sevoflurane anaesthesia. Eur J Anaesthesiol 2002; 19:452-4. [PMID: 12094921] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/25/2023]
Abstract
BACKGROUND AND OBJECTIVE In this randomized, double-blind study, we aimed to investigate the effect of aminophylline on recovery from sevoflurane. METHODS One-hundred ASA I-II patients scheduled for elective surgery were randomly divided into two groups receiving either NaCl 0.9% (Group 1, n = 50) or aminophylline 5mg kg(-1) (Group 2, n = 50). All patients were premedicated with atropine 0.01 mgkg(-1) and midazolam 0.06mgkg(-1) intramuscularly. Anaesthesia was induced with propofol 2mg kg(-1) for muscle relaxation, and atracurium 0.5 mg kg(-1) was maintained with sevoflurane 2% in 50% oxygen and nitrous oxide. Further atracurium (0.1 mgkg(-1) was given when needed. Aminophylline or saline was given after sevoflurane was discontinued. Heart rate, mean arterial pressure, peripheral oxygen saturation, the duration of anaesthesia and recovery times (eye opening, verbal response, extubation and successful performance of arithmetical calculations) were recorded. RESULTS There were no statistically significant differences in mean arterial pressure, peripheral oxygen saturation and anaesthesia time between the two groups. Heart rate increased significantly (P < 0.05) after aminophylline and was also higher than in the placebo group. Recovery times were significantly shorter (P < 0.001) in the patients receiving aminophylline. CONCLUSIONS Aminophylline speeded recovery after sevoflurane anaesthesia and it may have some advantage in anaesthesia practice for patients.
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Affiliation(s)
- A Turan
- Trakya University, Medical Faculty, Department of Anaesthesiology and Reanimation, Edirne, Turkey.
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Yildiz S, Güven B, Colak A, Uzun M. Progesterone profiles of fat-tailed tuj ewes following tactile and visual separation of rams at the beginning of the breeding season. J Vet Med A Physiol Pathol Clin Med 2002; 49:132-6. [PMID: 12019953 DOI: 10.1046/j.1439-0442.2002.00435.x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
The aim of this study was to determine the level and duration of progesterone secretion during the sequential oestrous cycles in fat-tailed Tuj ewes following tactile and visual separation of rams during the breeding season. For these purposes, rams were separated from the main flock for 50 days starting from the beginning of the breeding season and 21 ewes were randomly selected for the current experiment. In order to assess luteal activity and the length of oestrous cycles, the ewes were blood-sampled thrice or twice weekly for the measurement of progesterone in plasma. The data showed that 3 +/- 0.2 oestrous cycles were observed in this time window, and the first oestrous cycle observed was shorter (P < 0.05) than the following cycles (mean +/- SEM, 14.6 +/- 0.82, 16.5 +/- 0.48 and 17.0 +/- 0.54 days, respectively, for cycles 1, 2 and 3). Progesterone production was significantly lower in the first oestrous cycle compared with the second and third cycles on days 9, 12 and 14 of the cycles. The follicular periods of ewes showed four accumulations (maximum values using a 3-day moving average technique) throughout the study and the percentages of ewes at each accumulation (peak day +/- 1 day) were 50, 35, 65 and 80% for the first, second, third and fourth accumulations, respectively (P < 0.05). It was concluded that progesterone production was lower and the oestrous cycles were shorter during the first oestrous cycle and that tactile and visual separation of rams at the beginning of the breeding season might enhance the synchronizing effect towards the end of the breeding season in the fat-tailed Tuj ewes.
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Affiliation(s)
- S Yildiz
- Department of Physiology, Kafkas University, Kars, Turkey.
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Fantino AM, Colak A. Refugee children in Canada: searching for identity. Child Welfare 2001; 80:587-596. [PMID: 11678416] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Canada is providing a new home to refugees from around the globe, who have left their countries of origin because of persecution and are seeking safety elsewhere. These families bring with them myriad stresses arising from their migration. Child refugees, in particular, have special needs that must be considered--trauma from witnessing violent crimes, language difficulties, family disruption, and adjustment to a different culture--in addition to the challenges that accompany childhood and growing up.
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Affiliation(s)
- A M Fantino
- Community and Immigration Service, Catholic Social Services, Edmonton, Alberta, Canada
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Ozdemir O, Bulut HE, Korkmaz M, Onarlioglu B, Colak A. Increased cell proliferation and R.Msp1 fragmentation induced by 5-aza-2'-deoxycytidine in rat testes related to the gene imprinting mechanism. Exp Toxicol Pathol 2000; 52:317-22. [PMID: 10987184 DOI: 10.1016/s0940-2993(00)80056-1] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
DNA methylation is one of the crucial mechanisms for cellular and tissue differentiation during developmental stages in mammals. 5-aza-2'-deoxycytidine, a specific cytosine DNA Methyltransferase inhibitor, is known to cause DNA hypomethylation in CpG, CpNpG and CCGG sequences. Therefore the present study was designed to determine the effects of 5-aza-2'-deoxycytidine on the germinal cells of the adult rat testicular tissue. Rat testicular tissues from the 5-aza-2'-deoxycytidine treated experimental and non-treated control groups were processed for light microscopy and also for genomic DNA isolation assays. The isolated genomic DNAs were digested with R.Msp1 in order to determine the methyl pattern differences in the enzyme cognate CCGG sequence. Testicular tissues from treated rats showed increased cell proliferation when investigated at the light microscopical level. On the other hand, genomic DNA of these proliferative tissue showed high fragmentation sizes of R.Msp1 digestion when compared to controls. While the R.Msp1 digested control group DNA fragmentation condensed at approximately 4700-5100 bps size, the experimental group DNA fragmentation was condensed at 700-900 bps size. In addition, 5-aza-2'-deoxycytidine has effects on increased cell proliferation via the loss of somatic de novo gene imprinting. These results imply that abnormally imprinted normal somatic cells in mammals are susceptible to epigenetic modification. These results also suggest that the genomic DNA of testicular tissues from control rats is resistant to R.Msp1 while DNA from the experimental group testicular cells demonstrating high proliferation rate could not resist to R.Msp1 digestion due to DNA hypomethylation in CCGG sequence. In conclusion, it could be suggested that the reversal of gene imprinting in germinal cells may cause an increased cellular proliferation and R.Msp1 fragmentation when induced by 5-aza-2'-deoxycytidine.
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Affiliation(s)
- O Ozdemir
- Department of Medical Biology and Genetics, Faculty of Medicine, Cumhuriyet University, Sivas, Turkey.
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Kutlay M, Colak A, Demircan N, Akin ON, Kibici K, Dündar K, Yildirim S. Effect of hyperbaric oxygen therapy on fetal spinal grafts: an experimental study. Undersea Hyperb Med 2000; 27:205-213. [PMID: 11419361] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
In neural transplantation, lack of oxygen supply to the graft in acute stage is an important problem. This study was undertaken to evaluate the effects of hyperbaric oxygen (HBO2) on fetal spinal grafts. Spinal cord tissues obtained from 16-day fetal rats were transplanted into the spinal cord of adult Wistar rats (n = 30). After transplantation, they were randomly divided into two groups (n = 15 for each group); Group 1 received transplant alone, group 2 received transplant and HBO2 therapy consisting of 100% oxygen at 2.5 atm abs for 90 min twice a day for 7 days. Seven days after their surgery, all animals were killed for histologic examination. Degenerative changes, parenchymal integrity, host spinal cord edema, and vascularization of the graft were scored on a 3-point scale. Scores of these parameters were statistically analyzed. The graft survival rates in groups 1 and 2 were 54.5% and 71.4%, respectively. Animals treated with HBO2 showed statistically less spinal cord edema than the untreated groups (P < 0.05). Parenchymal integrity was also significantly better in this group (P < 0.05). The results indicate that edema reduction effect of HBO2 prevents the displacement of graft from the gap and contributes to the integration between the graft and host.
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Affiliation(s)
- M Kutlay
- GATA Haydarpasa Training Hospital, Department of Neurosurgery, Istanbul, Turkey
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Erten SF, Koçak A, Mizrak B, Kutlu R, Colak A. An end-plate chondroma mimicking calcified lumbar disc herniation. A case report and review of the literature. Neurosurg Rev 1999; 22:145-8. [PMID: 10547018 DOI: 10.1007/s101430050051] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Abstract
The authors report a case of chondroma arising from a vertebral end-plate and mimicking lumbar disc herniation. This tumor became calcified within 2 weeks. It was completely removed surgically, after which the patient's symptoms were relieved and neurological deficits regressed.
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Affiliation(s)
- S F Erten
- Department of Neurosurgery, Inönü University School of Medicine, Malatya, Turkey
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