Gurkan Acar

Kahramanmaras Sutcu Imam University, Marache, Kahramanmaraş, Turkey

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Publications (40)56.5 Total impact

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    ABSTRACT: The aims of this study were to evaluate atrial electromechanical delay, inflammation, and oxidative stress parameters, along with to investigate clinical and laboratory characteristics affecting atrial electromechanical delay in patients with chronic obstructive pulmonary disease (COPD). Forty-three patients with COPD (60.5 ± 9.9 years) and 50 healthy controls (59.6 ± 7.1 years) were included in the study. Atrial electromechanical delay intervals were measured from lateral mitral annulus corrected PA (cPA lateral) and lateral tricuspid annulus (cPA tricuspid) using tissue Doppler imaging (TDI), and corrected for heart rate. Left and right ventricles functions were examined using conventional and TDI. Plasma levels of high-sensitive C-reactive protein (hsCRP) and oxidative stress parameters were also measured. Factors associated with atrial electromechanical delay were evaluated by stepwise multiple regression analysis. Corrected PA lateral and cPA tricuspid were significantly higher in patients with COPD (69.8 ± 10.4 vs. 62.2 ± 8.9 msec, P < 0.001 and 45.4 ± 10.2 vs. 33.5 ± 5.1 msec, P < 0.001, respectively). Plasma levels of hsCRP and malondialdehyde, an indicator of oxidative stress, were increased in patient's group (15.7 ± 31.7 vs. 4.8 ± 4.7 mg/L, P = 0.01 and 17.1 ± 10.3 vs. 11.6 ± 7.9 nmol/L, P = 0.005, respectively). cPA lateral is independently related to lateral Em /Am ratio (β = -0.29, P = 0.004) and forced expiratory volume in 1st second/forced vital capacity (FEV1 /FVC) ratio (β = -0.24, P = 0.02). cPA tricuspid is independently related to only FEV1 /FVC ratio (β = -0.51, P < 0.001). This study shows that atrial electromechanical delay intervals are prolonged in patients with COPD. Prolongation of atrial electromechanical delay measured from lateral tricuspid annulus was independently related with FEV1 /FVC ratio in these patients.
    Echocardiography 12/2013; · 1.26 Impact Factor
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    ABSTRACT: Obesity is an independent risk factor for cardiovascular diseases. The effects of obesity on left ventricular structure and function have been reported, but relatively little is known regarding right ventricular (RV) function in obesity. To evaluate subclinical RV alterations in obese, but otherwise healthy, young adults by conventional echocardiography and tissue Doppler imaging (TDI). In this study, we included 35 normal weight healthy subjects with a body mass index (BMI) < 25 kg/m² (group I), 27 subjects with a BMI of 30-34.99 kg/m² (group II), and 42 subjects with a BMI > 35 kg/m² (group III). All subjects underwent transthoracic echocardiography. In addition to standard echocardiographic measurements, tricuspid annular peak systolic (Sm), peak early (Em), and late diastolic (Am) velocities, isovolumetric contraction (ICTm), relaxation (IRTm) time, and ejection time (ETm) were obtained by TDI, and RV myocardial performance index (MPIm) was calculated. In group II, RV Em/Am was significantly decreased and IRTm and MPIm were significantly increased compared to group I (p < 0.01). RV Sm, Em, and the Em/Am ratio were significantly lower and RV IRTm and MPIm were significantly higher in group III than in group II (p < 0.05 for RV Sm and IRTm and p < 0.01 for others). RV Am differed significantly between groups III and I (p < 0.05). BMI was significantly and negatively correlated with RV Sm, Em, and the Em/Am ratio, but positively correlated with RV MPI (p < 0.01). Our study showed that isolated obesity in young normotensive adults was associated with subclinical abnormalities in RV structure and function.
    Arquivos brasileiros de cardiologia 07/2013; · 1.32 Impact Factor
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    ABSTRACT: Abstract Background and objectives: Most hemodialysis patients show hemoglobin fluctuations between low-normal and high levels. This hemoglobin variability may cause left ventricle hypertrophy and may increase mortality as well. Recently, many studies were designed to evaluate the effect of hemoglobin variability on mortality but results were conflicting. We aimed to investigate the effect of hemoglobin variability on mortality and some cardiovascular parameters in hemodialysis population. Design, setting, participants and measurements: Hundred and seventy-five prevalent hemodialysis patients classified into three hemoglobin variability groups according to their hemoglobin levels throughout 24 month observation period: Low-Normal, Low-High, Normal-High. Groups were compared in terms of laboratory, demographical data and mortality rates, initial and the end of 24 month echocardiographic data. Initial and last echocardiographic data were compared within groups in terms of left ventricle mass index increase. Results: Mortality rates and cardiovascular risk factors such as coronary heart disease, diabetes mellitus and hypertension that may affect mortality were same between three groups. There was no significant difference between three groups in terms of echocardiographic and laboratory parameters. Only Low-High group showed significant increase on left ventricle mass index when initial and last echocardiographic parameters were compared. Conclusions: Consistent with previous studies, we found that most of the patients exhibited hemoglobin variability and our study is consistent with some of the studies that did not find any relationship between hemoglobin variability and mortality. Firstly, in this study based on objective data, it was shown that hemoglobin variability has adverse effect on left ventricle geometry independent from anemia.
    Renal Failure 07/2013; 35(6):819-24. · 0.94 Impact Factor
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    ABSTRACT: AIM: Hyperthyroidism is a well-known cause of atrial fibrillation (AF) which is associated with increased morbidity and mortality. Atrial electromechanical delay (EMD) is a significant predictor of AF. The aim of this study was to assess the atrial EMD and diastolic functions in subclinical and overt hyperthyroidism by using tissue Doppler imaging (TDI). METHODS AND RESULTS: The study population consisted of 3 groups: group I (30 healthy subjects), group II (38 patients with subclinical hyperthyroidism), and group III (25 patients with overt hyperthyroidism). Atrial electromechanical coupling was measured with TDI. Standard echocardiographic measurements and parameters of diastolic function were obtained by conventional echocardiography and TDI. Intra- and inter-atrial EMD were significantly prolonged in subclinical and overt hyperthyroidism compared with control group (P = 0.03 and P < 0.001 for intra-atrial EMD; P < 0.001 for inter-atrial EMD). In groups II and III, mitral A velocity (P = 0.005 and P = 0.001) and mitral E-wave deceleration time (P < 0.001 and P = 0.02) were significantly increased, and mitral E/A ratio (P = 0.005 and P = 0.001) was significantly decreased compared with the control group. The lateral mitral Em /Am ratio in group II and group III was significantly lower than controls (P = 0.001). Mitral Em /Am ratio (β = -0.32, P = 0.002) and thyroid stimulating hormone (TSH) level (β = -0.27, P = 0.009) were negatively and independently correlated with inter-atrial EMD. CONCLUSION: This study showed that intra- and inter-atrial electromechanical intervals were prolonged and diastolic function was impaired in both overt and subclinical hyperthyroidism. TSH level and mitral Em /Am ratio were found as independent predictors of atrial EMD.
    Echocardiography 06/2013; · 1.26 Impact Factor
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    ABSTRACT: OBJECTIVES: Ankylosing spondylitis (AS) is a chronic multi-systemic inflammatory rheumatic disorder. Several studies have suggested that the interval from the peak to the end of the electrocardiographic T wave (Tp-e) may correspond to the transmural dispersion of repolarization and that increased Tp-e interval and Tp-e/QT ratio are associated with malignant ventricular arrhythmias. The aim of this study was to evaluate ventricular repolarization by using Tp-e interval and Tp-e/QT ratio in patients with AS, and to assess the relation with inflammation. METHODS: Sixty-two patients with AS and 50 controls were included. Tp-e interval and Tp-e/QT ratio were measured from a 12-lead electrocardiogram, and the Tp-e interval corrected for heart rate. The plasma level of high sensitive C-reactive protein (hsCRP) was measured. These parameters were compared between groups. RESULTS: In electrocardiographic parameters analysis, QT dispersion (QTd) and corrected QTd were significantly increased in AS patients compared to the controls (31.7 ± 9.6 vs 28.2 ± 7.4 and 35.8 ± 11.5 vs 30.6 ± 7.9 ms, P = 0.03 and P = 0.007, respectively). cTp-e interval and Tp-e/QT ratio were also significantly higher in AS patients (92.1 ± 10.2 vs 75.8 ± 8.4 and 0.22 ± 0.02 vs 0.19 ± 0.02 ms, all P values <0.001). cTp-e interval and Tp-e/QT ratio were significantly correlated with hsCRP (r = 0.63, P < 0.001 and r = 0.49, P < 0.001, respectively). CONCLUSIONS: Our study revealed that Tp-e interval and Tp-e/QT ratio were increased in AS patients. These electrocardiographic ventricular repolarization indexes were significantly correlated with the plasma level of hsCRP.
    Modern Rheumatology 04/2013; · 1.72 Impact Factor
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    ABSTRACT: Introduction. Valvular abnormalities frequently occur in patients with chronic kidney failure. This study evaluated the prevalence of heart valve calcification (HVC) in hemodialysis patients and factors associated with it. Materials and Methods. Medical charts of 129 hemodialysis patients were reviewed retrospectively. Demographic features and laboratory analysis of the patients were systematically recorded. Echocardiographic findings were collected, including ejection fraction, aortic valve calcification (AVC), mitral valve calcification (MVC), left ventricle mass, left ventricle mass index, and pulmonary artery pressure. Results. Valvular abnormalities were found in 43 patients (33.3%); 30 patients (23.3%) had MVC, 28 (21.7%) had AVC, and 15 (11.6%) had both MVC and AVC. Patients with HVC were older than other patients (P < .001). On echocardiography, higher left ventricle mass, left ventricle mass index, and pulmonary artery pressure levels were found in patients with HVC. Regarding the lipid profile, serum calcium, serum phosphorus, calcium-phosphorus product, and parathyroid hormone concentrations, there were no significant differences between patients with and without HVC. Ejection fraction levels were significantly lower in patients with HVC (P = .002) and serum albumin level of patients with HVC was significantly diminished. Conclusions. This study failed to show an association between HVC in hemodialysis patients and calcium-phosphorus product and parathyroid hormone levels; however, age and diabetes mellitus could be regarded as risk factors. In addition, HVC may lead to increased left ventricle mass index and pulmonary artery pressure and decreased ejection fraction, and low albumin levels may be attributable to inflammation.
    Iranian journal of kidney diseases 03/2013; 7(2):129-34. · 0.94 Impact Factor
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    ABSTRACT: A few studies have shown that elevated CA-125 levels are associated with chronic obstructive pulmonary disease (COPD). However, there are no data concerning the associaton between serum CA-125 levels and right ventricular (RV) function in COPD patients. This study aimed to evaluate the relationship between CA-125 level and RV echocardiographic parameters in COPD patients. Fifty-two patients with COPD (39 male/13 female, mean age 68.9 ± 5.7 years) were studied. The control group consisted of 30 age-sex matched healthy volunteers (23 male/7 female, mean age 64.2 ± 6.3 years). Patients were divided into two subgroups: patients without pulmonary hypertension (group I, n = 25) and with pulmonary hypertension (group II, n = 27). Conventional echocardiographic parameters, tissue Doppler imaging (TDI) and CA-125 level measurements were performed in all subjects. Patients in group II had significantly higher CA-125 levels than those in group I and controls (P < 0.01). CA-125 levels in group I were also higher than control group (P < 0.05). CA-125 levels were correlated with left ventricle E/A ratio, systolic pulmonary artery pressure (sPAP), RV myocardial performance index, and RV fractional area change (r = 0.37, 0.56, 0.34, and -0.42, respectively, all with P < 0.05). There was an independent correlation between CA-125 levels and sPAP values (β = 0.76, P < 0.001). Our results show an independent correlation between CA-125 levels and systolic pulmonary artery pressure in COPD patients. The clinical utility of these results at this point in time is unknown and deserves future research.
    Southern medical journal 09/2011; 104(9):624-8. · 0.92 Impact Factor
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    ABSTRACT: This study was designed to investigate the validity of brain natriuretic peptide (BNP) levels for the estimation of the shunt size in young adults with atrial septal defect (ASD), and to determine the relationship between BNP levels and echocardiographic parameters of right heart chambers. Fifty-six patients with ASD (mean age 22.9 ± 2.0 years) were studied. The control group consisted of 31 age-gender matched healthy volunteers (mean age 22.7 ± 1.9 years). Coventional echocardiography, tissue Doppler imaging (TDI) and plasma BNP level measurement was performed in all participants. The ratio of pulmonary to systemic blood flow (Qp/Qs) was measured noninvasively using transthoracic echocardiography. Plasma BNP levels were significantly higher in ASD patients than in controls (42.9 ± 29.4 vs. 8.3 ± 2.6 pg/mL, P < 0.05). Pulmonary artery pressure (PAP) (P = 0.0001), right atrium (RA) volume (P = 0.0001), and right ventricular end-diastolic volume (RVEDV) (P = 0.0001) values were higher in ASD patients. There was a powerful correlation between plasma BNP levels and Qp/Qs ratio (r = 0.71, P < 0.0001). The plasma BNP levels significantly correlated with PAP (r = 0.61, P < 0.0001), RA volume (r = 0.54, P < 0.0001), RVEDV (r = 0.55, P < 0.0001), and right ventricular myocardial performance index (r = 0.50, P < 0.0001). This study shows that there is a significant correlation between right heart echocardiographic parameters and concentrations of BNP in the plasma of young adults with ASD. BNP levels may provide a supplemental data to predict of shunt size in these patients.
    Echocardiography 02/2011; 28(2):243-7. · 1.26 Impact Factor
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    ABSTRACT: Abstract A 33-year-old woman in the ninth week of her eighth pregnancy was referred to our clinic because of dyspnoea on mild exertion. She had had seven uncomplicated pregnancies in her past medical history. Physical examination revealed a grade 3/6 systolic murmur in the pulmonary area. The electrocardiogram showed right bundle branch block and right ventricular strain pattern. Transthoracic echocardiogram revealed an aneurysm of the pulmonary artery with extremely high pulmonary artery pressure and right ventricular hypertrophy (figure 1). She was offered medical abortion.
    Netherlands heart journal: monthly journal of the Netherlands Society of Cardiology and the Netherlands Heart Foundation 10/2010; 18(10):503-4. · 1.41 Impact Factor
  • International Journal of Cardiology - INT J CARDIOL. 01/2010; 140.
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    ABSTRACT: Double right coronary artery (RCA) is an extremely rare coronary artery anomaly. We aimed to report an atherosclerotic double RCA which appeared after primary percutaneous intervention performed to treat acute inferior myocardial infarction. This is the first case in the literature, which the coronary arteries that can be accepted as double RCA have been hidden by total atherosclerotic occlusion of the proximal part of the RCA. In this paper, also the definition, correct diagnosis, and appropriate diagnostic methods for double RCA were discussed.
    Cardiology research and practice. 01/2010; 2010.
  • International Journal of Cardiology - INT J CARDIOL. 01/2010; 140.
  • International Journal of Cardiology - INT J CARDIOL. 01/2010; 140.
  • International Journal of Cardiology - INT J CARDIOL. 01/2010; 140.
  • International Journal of Cardiology - INT J CARDIOL. 01/2010; 140.
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    ABSTRACT: Arrhythmias have been reported to occur frequently in symptomatic patients with mitral valve prolapse (MVP). The mechanisms causing atrial arrhythmias in patients with MVP have not been fully investigated. The purpose of this study was to determine the clinical, echocardiographic and heart rate variability parameters, and plasma concentrations of electrolytes and inflammatory markers in predicting atrial arrhythmias in patients with MVP. A total of 58 consecutive patients with MVP were included in this study. We performed electrocardiography, echocardiography, Holter analysis, routine biochemical tests including plasma concentrations of electrolytes and inflammatory markers, and evaluated the clinical characteristics. Atrial arrhythmia was defined as occurrence of any of the following: atrial premature contractions, atrial couplets, supraventricular tachycardia, atrial flutter or fibrillation documented by Holter analysis, continuous monitoring or by electrocardiography. Twenty-eight patients (48%) had atrial arrhythmias, and 30 (52%) patients had no atrial arrhythmias. Univariable predictors of atrial arrhythmias included isovolumetric relaxation time, lateral systolic (S'), lateral late diastolic (A'), septal A' Doppler velocities, anterior mitral leaflet thickness, anterior mitral leaflet thickness of > or =5 mm, posterior mitral leaflet thickness and the occurrence of moderate to severe mitral regurgitation. Multivariable logistic regression analysis showed that occurrence of moderate to severe mitral regurgitation was the only independent predictor of atrial arrhythmias (relative risk: 2.4, 95% confidence interval 1.32-4.86, P = 0.005). The present study showed that the only independent predictor of atrial arrhythmias in patients with MVP is the occurrence of moderate to severe mitral regurgitation.
    Acta cardiologica 12/2009; 64(6):755-60. · 0.61 Impact Factor
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    ABSTRACT: Background: Pulmonary hypertension (PH) has been reported to be high among end-stage renal disease (ESRD) patients. Objectives: The aim of this study was to investigate the role of arteriovenous fistula (AVF) flow in the pathogenesis of PH and the prevalence of PH in patients with chronic renal failure (CRF) and to suggest other possible etiologic factors. Methods: The prevalence of PH was prospectively estimated by Doppler echocardiography in 116 ESRD patients on regular hemodialysis (HD). Laboratory and clinical variables were compared between patients with and without PH (groups 1 and 2, respectively). PH was defined as systolic pulmonary artery pressure (SPAP) over 30 mm Hg. Patients with PH underwent further evaluation by 2 pulmonologists. AVF flow was measured by Doppler ultrasonography. Blood tests including arterial blood gases, hemoglobin, serum calcium, phosphorus and parathyroid hormone were determined. Results: PH was found in 25 (21.6%) patients (group 1) with an SPAP of 37.9 +/- 2.8 mm Hg. Mean AVF flow was increased (1,554 +/- 207.60 ml/min) in group 1. Left ventricular ejection fraction (LVEF) was significantly different between the 2 groups (55.3 +/- 11.5 and 64.4 +/- 40, respectively; p < 0.05). Neither significant primary lung disease nor parenchymal lesions were detected in group 1. PH showed a significant difference for cigarette smoking (p < 0.05). In group 1 the prevalence of cigarette smoking was higher. The main etiology of CRF was diabetes mellitus with a ratio of 44% in group 1. Conclusion: Our study demonstrated a surprisingly high prevalence of PH among patients receiving long-term HD. PH was related to high AVF flow, low LVEF and cigarette smoking. AVF flow and cigarette smoking are important correctable causes of PH. Early detection is important in order to avoid the serious consequences.
    Respiration 10/2009; 78(4):411-415. · 2.62 Impact Factor
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    ABSTRACT: Arrhythmias have been reported to occur frequently in symptomatic patients with mitral valve prolapse (MVP). The mechanisms causing ventricular arrhythmias in patients with MVP have not been fully investigated. The purpose of this study was to determine the clinical, echocardiographic and heart rate variability parameters, and plasma concentrations of electrolytes and inflammatory markers in predicting ventricular arrhythmias in patients with MVP. A total of 58 consecutive patients with MVP were included in this study. We performed electrocardiography, echocardiography, holter analysis, routine biochemical tests including plasma concentrations of electrolytes and inflammatory markers, and evaluated the clinical characteristics. Ventricular arrhythmia defined as occurrence of any of the followings: ventricular premature contractions (VPCs), VPC couplets, and ventricular tachycardia documented by holter analysis, continuous monitoring or by electrocardiography. Twenty patients (34%) had ventricular arrhythmias, and 38 (66%) patients had no ventricular arrhythmias. Seventeen patients had VPC, 2 patients had VPC couplets and 1 patient had ventricular tachycardia. Univariable predictors of ventricular arrhythmias included isovolumetric relaxation time and the occurrence of moderate to severe mitral regurgitation. Multivariable logistic regression analysis showed that occurrence of moderate to severe mitral regurgitation was the only independent predictor of ventricular arrhythmias (relative risk: 8.42, 95% confidence interval: 1.49-47.64, p = 0.01). Present study showed that the only independent predictor of ventricular arrhythmias in patients with MVP is the occurrence of moderate to severe mitral regurgitation.
    The international journal of cardiovascular imaging 10/2009; 26(2):139-45. · 2.15 Impact Factor
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    ABSTRACT: Familial Mediterranean fever (FMF) is a disease characterized by sporadic, paroxysmal attacks of fever and serosal inflammation. QT dispersion (QTd) and transmural dispersion of repolarization (TDR), simple noninvasive arrhythmogenic markers, that can be used to assess homogeneity of cardiac repolarization, have not been studied in FMF patients before. The aim of our study was to evaluate the QTd and TDR in FMF patients without overt cardiac involvement. A total of 50 patients with FMF (30 men, 20 women, 29.4 +/- 11.8 years) and 50 controls (30 men, 20 women; mean age 31.3 +/- 11.9 years) were included. QTd, corrected QTd (cQTd), maximum QT (QTmax), maximum corrected QT (cQTmax), minimum QT (QTmin), and minimum corrected QT intervals (cQTmin) and TDR were measured from standard 12-lead electrocardiography (ECG). We found that QTd, QTmax, and TDR were greater in FMF patients than in the control group (36.0 +/- 11.4 vs. 20 +/- 11.2, P < 0.001 and 354.8 +/- 30.9 vs. 342.8 +/- 18.0, P = 0.02; 62.0 +/- 16.0 vs. 49.0 +/- 9.5 P < 0.001, respectively), as were cQTd and cQTmax (40.4 +/- 13.5 vs. 21.9 +/- 12.4, P < 0.001 and 397.7 +/- 40.2 vs. 375.5 +/- 25.4 P = 0.001). A modest positive correlation was found between cQTd and C-reactive protein (CRP) and erythrocyte sedimentation rate (ESR) (r = 0.30, P < 0.001; r = 0.40, P < 0.001; respectively). QTd, which is an index of inhomogeneity of ventricular repolarization and an important predictor of cardiovascular mortality, and TDR, which is a better marker of cardiac repolarization, increased in FMF patients similarly as in other rheumatologic diseases.
    Modern Rheumatology 08/2009; 19(5):550-5. · 1.72 Impact Factor
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    ABSTRACT: The aim of this study was to evaluate atrial conduction abnormalities obtained by Doppler tissue imaging (DTI) and electrocardiogram analysis in ankylosing spondylitis (AS) patients. A total of 40 patients with AS (22 males /18 females, 37.82 +/- 10.22 years), and 42 controls (22 males/20 females, 35.74 +/- 9.98 years) were included. Systolic and diastolic left ventricular (LV) functions were measured by using conventional echocardiography and DTI. Interatrial and intraatrial electromechanical coupling (PA) intervals were measured with DTI. P-wave dispersion (PD) was calculated from the 12-lead electrocardiogram. Atrial electromechanical coupling at the left lateral mitral annulus (PA lateral) was significantly delayed in AS patients (61.65 +/- 7.81 vs 53.69 +/- 6.75 ms, P < 0.0001). Interatrial (PA lateral - PA tricuspid), intraatrial electromechanical coupling intervals (PA septum - PA tricuspid), maximum P-wave (Pmax) duration, and PD were significantly longer in AS patients (23.50 +/- 7.08 vs 14.76 +/- 5.69 ms, P < 0.0001; 5.08 +/- 5.24 vs 2.12 +/- 2.09 ms, P = 0.001; 103.85 +/- 6.10 vs 97.52 +/- 6.79 ms, P < 0.0001; and 48.65 +/- 6.17 vs 40.98 +/- 5.37 ms, P < 0.0001, respectively). Reflecting LV diastolic function mitral A-wave and E/A, mitral E-wave deceleration time (DT), Am and Em/Am were significantly different between the groups (P < 0.05). We found a significant correlation between interatrial electromechanical coupling interval with PD (r = 0.536, P < 0.01). Interatrial electromechanical coupling interval was positively correlated with DT (r = 0.422, P < 0.01) and inversely correlated with E/A (r =-0.263, P < 0.05) and Em/Am (r =-0.263, P < 0.05). This study shows that atrial electromechanical coupling intervals and PD are delayed, and LV diastolic functions are impaired in AS patients.
    Echocardiography 05/2009; 26(5):549-57. · 1.26 Impact Factor

Publication Stats

218 Citations
56.50 Total Impact Points

Institutions

  • 2009–2010
    • Kahramanmaras Sutcu Imam University
      • Faculty of Medicine
      Marache, Kahramanmaraş, Turkey
  • 2007
    • Karadeniz Technical University
      • Department of Cardiology
      Atrabazandah, Trabzon, Turkey
    • State Hospital of Ercis, Turkey
      Arcis, Van, Turkey
  • 2003–2006
    • T.C. Süleyman Demirel Üniversitesi
      • Department of Cardiology
      Hamitabat, Isparta, Turkey
  • 2004
    • Izmir Bozkaya Research and Training Hospital
      Ismir, İzmir, Turkey