Relation of red cell distribution width with dipper and non-dipper hypertension.

Aim Red cell distribution width (RDW), an index of erythrocyte size, is associated with high risk for cardiovascular disease. Nondipping hypertension (HT) is lack of nocturnal fall in blood pressure(BP). The association between RDW and non-dipping BP in normotensive and hypertensive patients was investigated. Methods A total of 170 patients were categorized into 4 groups: Normotensive-Dipper (NT-D), Normotensive-Non-dipper (NTND), Hypertensive-Dipper (HT-D) and Hypertensive-Non-dipper(HT-ND). RDW and hs-CRP levels were measured. Results Hypertensive patients had higher RDW and hs-CRP levels(14.5 ± 0.87 vs.12.7 ± 0.66, p<0.001 for RDW; 0.99 ± 0.52 vs.0.63 ± 0.43, p<0.001 for hs-CRP). Besides, the RDW levels were higher in non-dippers (13.0 ± 0.63 vs.12.4 ± 0.55, p<0.001 for NT-ND and NT-D; 14.9 ± 0.78 vs.14.2 ± 0.82, p<0.001 for HT-ND and HT-D) Conclusion RDW is elevated in non-dipping BP both in normotensive and hypertensive subjects, which may be related with increased inflammatory state.

Relation of fragmented QRS to tissue Doppler-derived parametersin patients with familial Mediterranean fever.

BACKGROUND: Familial Mediterranean fever (FMF) may pose a risk for cardiovascular diseases due to continuous inflammatory status observed during the course of the disease. Recently, the presence of fragmented QRS (fQRS) has been recognized as a predictor of myocardial fibrosis. In this study, we aim to investigate the frequency of fQRS and its relation to Doppler-based indices. METHODS: This study consisted of 80 FMF patients and 30 healthy control subjects. fQRS pattern was defined as the presence of additional R waves or RSR', evidenced by notched R or S wave on electrocardiography (ECG). The patient and the control groups underwent conventional echocardiography and tissue Doppler echocardiography. RESULTS: There was no significant difference between groups regarding age (29 ± 12 vs 29 ± 15). FMF patients exhibited a statistically higher frequency of fQRS (% 56 vs % 13) (p < 0.01). E/Em ratio showed a statistically significant increase in the FMF group with fQRS (p < 0.0001), while the mean Em value was markedly lower (p < 0.0001). CONCLUSIONS: FMF patients displayed a statistically significant increase in frequency of fQRS. Doppler-derived diastolic index was statistically significantly impaired in FMF patients with fQRS as compared with the patients without fQRS. In conclusion, fQRS might be a new noninvasive marker for cardiac involvement in FMF patients.

Effect of remote ischemic postconditioning on left ventricular mechanics.

BACKGROUND: Remote ischemic postconditioning (RIPC) decreases infarct size and prevents left ventricular (LV) remodeling in patients with myocardial infarction. However, there is no study that evaluates the effect of RIPC on LV mechanics assessed by speckle tracking echocardiography. Therefore, we aimed to test the effects of RIPC on LV deformation parameters such as strain, strain rate, rotation, and twist in healthy subjects. METHODS: The study group consisted of 22 healthy subjects. To test the effects of RIPC, 3 cycles of reperfusion followed by ischemia (each lasting 10 or 30 seconds) were applied immediately after 20 minutes of nondominant arm ischemia. Transthoracic echocardiography (TTE) was obtained at baseline and repeated 30 minutes after the completion of these cycles. In TTE images, apical 4-3-2 chamber longitudinal strain (LS)/strain rate, basal and apical circumferential strain/strain rate, and rotational parameters, such as basal rotation, apical rotation, and LV twist, were recorded. RESULTS: Apical 4-3-2 chamber LS and apical circumferential strain/strain rate measurements were comparable before and after RIPC, whereas basal circumferential strain was significantly decreased after RIPC (-23 ± 3.4 vs. -18.9 ± 6.9, P = 0.017). After RIPC, apical rotation was significantly increased (11.6 ± 3.7 vs. 16.7 ± 4.0, P < 0.001) and basal rotation was significantly decreased (-6.1 ± 2.1 vs. -4.7 ± 2.4, P = 0.03).Consequently, net LV twist was significantly increased (17.4 ± 4.5 vs. 21.7 ± 4.7). CONCLUSIONS: We proposed that RIPC affects the rotational mechanics of the heart rather than longitudinal mechanics. These results might give new insights into understanding the favorable effects of the post- conditioning.

The relationship between coronary collateral circulation and neutrophil/lymphocyte ratio in patients with coronary chronic total occlusion.

OBJECTIVES: To investigate the relationship between neutrophil/lymphocyte ratio (NLR) and coronary collateral circulation (CCC) in patients with coronary chronic total occlusion. SUBJECTS AND METHODS: Our study population consisted of 275 consecutive patients with chronic total occlusion. One hundred and thirty-eight patients with chronic total occlusion were included in the study. They were classified into 2 groups as follows: impaired CCC (group 1: Rentrop grades 0-1) and good CCC (group 2: Rentrop grades 2-3). The NLR was calculated from the complete blood count. RESULTS: The NLR values of the patients with impaired CCC (4.5 ± 0.7) were significantly higher than of those with good CCC (2.7 ± 0.6, p < 0.001). In the multivariate logistic regression test, NLR (OR 33.36, 95% CI 8.189-135.7, p < 0.001), high-sensitivity C-reactive protein (hs-CRP; OR 2.152, 95% CI 1.226-3.777, p = 0.008), estimated glomerular filtration rate (OR 1.167, 95% CI 1.049-1.298, p = 0.004) and systolic blood pressure (OR 1.068, 95% CI 1.009-1.1310, p = 0.025) were independent predictors of impaired CCC. The NLR value >3.55 yielded an area under the curve value of 0.957 (95% CI 0.921-0.992, p < 0.001) and demonstrated a sensitivity of 95% and a specificity of 90% for the prediction of CCC. A moderate correlation between NLR and hs-CRP was observed (r = 0.443; p < 0.001). CONCLUSION: Our findings reveal that NLR correlates with the impaired development of coronary collaterals.

Left ventricular systolic dysfunction in patients with ankylosing spondylitis without clinically overt cardiovascular disease by speckle tracking echocardiography.

The aim of this study was to evaluate left ventricular systolic and diastolic function using speckle tracking echocardiography (STE) in order to detect subclinical left ventricular dysfunction in patients with ankylosing spondylitis (AS). Twenty-six AS patients (age 43.7 ± 11.8 years, disease duration 11.83 ± 10.98 years) and 26 healthy controls, matched for age, sex, body mass index, and smoking, were enrolled in this cross-sectional study. All patients underwent two-dimensional, Doppler, tissue Doppler, and speckle tracking echocardiography. The mitral early/late diastolic inflow velocity ratio (1.0 ± 0.4 vs. 1.5 ± 0.5; p < 0.001) and the mitral E-wave velocity (8.1 ± 2 vs. 11.1 ± 3; p < 0.001) were lower in the AS patients than in the controls. The ejection fraction did not differ between the patients and controls (64 ± 4.2 vs. 64.8 ± 2.3; p = 0.402). All segments showed a significant decrease in left ventricular diastolic and systolic strain values in the patients with AS when compared with the healthy controls (p < 0.001). Despite no clinical evidence of cardiovascular disease, patients with AS may have impaired left ventricular systolic function as assessed by STE.

Malouf syndrome with hypergonadotropic hypogonadism and cardiomyopathy: two-case report and literature review.

Malouf syndrome is a very rarely encountered syndrome which was first diagnosed in 1985 upon the examination of two sisters, with findings of hypergonadotropic hypogonadism, dilated cardiomyopathy, blepharoptosis, and broad nasal base. Later on, Narahara diagnosed another sporadic case with the same findings. A survey of relevant literature leads us to three women cases in total. Here we present two cases of Malouf syndrome and literature review.

Menopausal cardiomyopathy: does it really exist? A case-control deformation imaging study.

AIM: We aimed to evaluate and compare the left ventricular (LV) functions of pre- and postmenopausal women at similar ages with none of the known cardiovascular risk factors, by both conventional and advanced echocardiographic methods such as 2-D strain imaging via speckle tracking echocardiography. METHODS: The study population consisted of 40 healthy postmenopausal women aged 45-50 years and 40 healthy premenopausal women of the same age group. None of the subjects had any cardiovascular risk factors and were on hormone replacement therapy. LV strain and strain rate parameters were measured by 2-D strain imaging. The main outcome measure was effect of menopause on LV function. RESULTS: There were no significant differences between the pre- and postmenopausal groups with regard to conventional echocardiographic parameters. LV longitudinal strain and LV early diastolic strain rate values were significantly lower in the postmenopausal group when compared to the premenopausal group. Also, there was a significant negative correlation between LV global strain and serum follicle-stimulating hormone (r = -0.349, P = 0.002). CONCLUSION: Our study results demonstrated that healthy postmenopausal women had lower LV longitudinal strain values when compared to the healthy premenopausal women of the same age group by speckle tracking echocardiography.

Evaluation of Tp-e interval and Tp-e/QT ratio in patients with ankylosing spondylitis.

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.

Evaluation of Tp-e interval and Tp-e/QT ratio in patients with rheumatoid arthritis.

OBJECTIVES: 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 the Tp-e interval and Tp-e/QT ratio in patients with rheumatoid arthritis (RA), and to assess the relation with inflammation. STUDY DESIGN: Ninety-six patients (72 females, 24 males; mean age 43.8±11.8 years) with RA and 50 controls (35 females, 15 males; mean age 44.2±11.1 years) were included. From the 12-lead electrocardiogram, Tp-e interval and Tp-e/QT ratio were measured. Blood samples were taken for erythrocyte sedimentation rate (ESR) and plasma levels of C-reactive protein (CRP). These parameters were compared between groups. The relationship between ventricular repolarization and inflammation was assessed by Pearson correlation coefficients. RESULTS: Tp-e interval and Tp-e/QT ratio were increased in RA patients compared to the controls (72.6±8.2 vs 66.4±8.5 ms, 0.20±0.02 vs 0.18±0.02; p<0.001 and p<0.001, respectively). The Tp-e interval was significantly correlated with CRP, ESR, and disease activity score (DAS-28) (r=0.56, p<0.001, r=0.57, p<0.001, and r=0.29, p=0.02, respectively). The Tp-e/QT ratio was also correlated with CRP, ESR, and DAS-28 score (r=0.43, p<0.001, r=0.53, p<0.001, and r=0.25, p=0.03, respectively). CONCLUSION: In RA patients, the increased frequency of ventricular arrhythmias may be explained by increased indexes of ventricular repolarization and their relationship with inflammation.

Optimal timing of valve replacement in asymptomatic severe aortic stenosis.

Patients with asymptomatic severe aortic stenosis (AS) constitute a heterogeneous group which includes not only certain cases who are at high risk of sudden death and valve-related heart failure, but also those at low risk for these events. Degenerative AS, which includes a majority of patients with AS, is characterized by stricture of the valve, increased arterial stiffness, and diverse left ventricular response to the valvular plus arterial vascular load. In addition to using traditional primary parameters, the severity of AS and the total left ventricular load should be assessed using new measures such as energy loss index and valvulo-arterial impedance. Natriuretic peptide levels and global longitudinal strain imaging may also be used as secondary parameters to obtain information about left ventricular systolic function, although these parameters do not correlate with the severity of AS. Exercise stress testing and exercise echocardiography are also beneficial when assessing the patient if they are symptomatic, and for determining valvular and left ventricular contractile reserves. The aim of this review was to emphasize the importance of risk stratifications in asymptomatic severe AS cases, and to assess the severity of AS using not only conventional methods but also new methods on which much emphasis has been placed during recent years.

Mitral valve resistance correlates more closely with left atrial deformation than with conventional indices of rheumatic mitral stenosis.

BACKGROUND AND AIM OF THE STUDY: The relationship between mitral valve (MV) resistance and left atrial (LA) mechanical function is unknown. Hence, the study aim was to investigate the relationship between LA mechanics and MV resistance, compared to conventional indices such as mitral valve area (MVA) and transmitral gradient, in patients with rheumatic mitral stenosis (MS). METHODS: The study population consisted of 73 patients with MS and 30 age- and gender-matched controls. MV resistance was calculated and LA strain parameters were assessed from the apical four-chamber view by speckle tracking echocardiography (LA reservoir strain, LA pump strain, LA strain rate (SR)) in all subjects. RESULTS: The MS group has a markedly higher MV resistance (94 +/- 46 versus 67 +/- 22 dynes x s x cm(-5), p = 0.003) and lower LA reservoir strain (24.5 +/- 7.4% versus 36.6 +/- 3.8%, p < 0.001), LA pump strain (12.0 +/- 5.0% versus 17.1 +/- 3.4%, p < 0.001) and SR (1.23 +/- 0.33 versus 1.4 +/- 0.29, p = 0.017) values compared to controls. Moreover, both LA reservoir strain and LA pump strain correlated with MV resistance more closely than did MVA and transmitral gradients. Multiple linear regression analysis revealed only MV resistance to be an independent predictor of LA reservoir strain, while MV resistance, indexed left atrial volume and mean gradient were independent predictors of LA pump strain. CONCLUSION: It can be concluded that, in patients with MS, mitral valve resistance was more closely related to LA mechanics measurements than were conventional indices of MS.

Evaluation of atrial electromechanical delay and diastolic functions in patients with hyperthyroidism.

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 (ß = -0.32, P = 0.002) and thyroid stimulating hormone (TSH) level (ß = -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.

Evaluation of Tp-e interval and Tp-e/QT ratio in patients with ankylosing spondylitis.

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.

Prevalence and risk factors of valvular calcification in hemodialysis patients.

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.

The effect of antithyroid treatment on atrial conduction times in patients with subclinical hyperthyroidism.

BACKGROUND: Prolonged atrial conduction time measured by tissue Doppler imaging (TDI) has been associated with increased risk of atrial fibrillation. We aimed to evaluate the effect of subclinical hyperthyroidism (SH) and antithyroid treatment on atrial conduction time. METHODS: A total of 30 patients with SH (26 females; mean age 34.8 ± 8.5 years) and 30 age- and gender-matched controls were included. Using TDI, atrial conduction time was measured from the lateral mitral annulus, septal mitral annulus, and lateral tricuspid annulus. Intra- and interatrial conduction delay were calculated. TDI and thyroid hormone levels were studied at the time of enrollment and after achievement of euthyroid state with propylthiouracil treatment. Patients were followed for 14 ± 3 weeks. RESULTS: Atrial conduction time at the lateral and septal mitral annulus were significantly higher in patients with SH compared to controls. Both inter-, right, and left intraatrial electromechanical delay were prolonged in patients with SH compared to control subjects (21.3 ± 6.1 vs. 13.9 ± 4.3, P < 0.001 and 4.2 ± 3.5 vs. 2.3 ± 1.9, P = 0.014 and 17.1 ± 6.0 vs. 11.6 ± 3.8, P < 0.001, respectively). After achievement of euthyroid state, inter- and left intraatrial electromechanical delay were significantly decreased compared to baseline values and approximated to the values of the control group (P < 0.001). CONCLUSION: SH is associated with prolonged atrial conduction time. After achievement of euthyroid state, decrement in atrial conduction time may reveal how the antithyroid treatment may prevent the development of atrial fibrillation in these patients.

Relation of inflammatory and oxidative markers to the occurrence and recurrence of persistent atrial fibrillation.

OBJECTIVES: There is increasing evidence linking inflammation and oxidative stress to atrial fibrillation (AF). In this study, we tested the hypothesis that C-reactive protein (CRP) and oxidative stress markers can predict the recurrence of persistent AF after successful pharmacological cardioversion. A possible relationship with AF occurrence was also investigated. STUDY DESIGN: Using a case-control study design, CRP, catalase, superoxide dismutase (SOD), and malondialdehyde (MDA) levels of 42 patients (23 female, 19 male; mean age 58.4±13.6 years) with documented persistent AF episodes were compared with 21 controls (9 female; 12 male; mean age 58.1±6.9 years). RESULTS: Overall AF patients were followed for 6 months, and 17 showed recurrence. Then, they were divided into two groups (recurrence and no recurrence) and compared with each other. CRP, SOD, and MDA levels were significantly higher in AF patients compared with controls. However, only CRP levels were significantly higher in patients with AF recurrence compared to those without recurrence. CONCLUSION: Increased markers of inflammation and oxidative stress are found in patients with persistent AF, suggesting that inflammation and oxidative stress may be associated with the presence of arrhythmia.

Beneficial effects of nebivolol treatment on oxidative stress parameters in patients with slow coronary flow.

OBJECTIVES: Imbalance between oxidative stress and antioxidant defense has been demonstrated in patients with slow coronary flow (SCF). The aim of this study was to investigate the effect of nebivolol treatment on oxidative stress parameters in SCF patients. STUDY DESIGN: The study included 32 patients (10 females, 22 males; mean age 53.3 ± 5.2 years) with SCF and 32 control subjects (14 females, 18 males; mean age 50.6 ± 5.2 years) with normal coronary arteries on angiography. Coronary slow flow was determined by the TIMI frame count method. Patients with SCF received nebivolol treatment (5 mg/day) for six months. Blood samples were analyzed for malondialdehyde (MDA) and serum nitric oxide (NO) levels, and erythrocyte catalase (CAT) and erythrocyte superoxide dismutase (SOD) activities in the control group and, in SCF patients, at baseline and after six months of nebivolol treatment. RESULTS: The two groups were similar with respect to age, body mass index, blood pressure, heart rate, and lipid profile. Smoking was more frequent in the SCF group compared to the controls. TIMI frame counts measured from the left anterior descending, circumflex, and right coronary arteries were significantly higher in the SCF group (p < 0.0001). Baseline MDA and NO levels, and SOD and CAT activities were significantly different between the two groups, with significantly increased MDA (p < 0.0001), and significantly decreased SOD (p < 0.0001), CAT (p < 0.001), and NO (p < 0.001) in the SCF group. After six months of nebivolol treatment, all oxidative stress parameters showed significant improvements compared to the baseline values (p < 0.0001 for MDA, SOD, CAT, and NO) and approximated to the values of the control group. CONCLUSION: Our results show that nebivolol treatment may be beneficial to improve oxidative stress parameters in patients with SCF, which are considered to be an early stage of atherosclerosis.

The prevalence and predictors of atrial fibrillation in hemodialysis patients.

OBJECTIVES: The aim of this study was to determine the prevalence of atrial fibrillation in long-term hemodialysis patients and to identify clinical and echocardiographic risk factors. STUDY DESIGN: The study included 183 patients (93 males, 90 females; mean age 52+/-17 years) who had been on long-term hemodialysis treatment (mean 41.6+/-39.8 months) and had preserved systolic function. Atrial fibrillation was determined electrocardiographically and the patients were divided into two groups depending on the presence or absence of atrial fibrillation. Conventional and tissue Doppler echocardiographic examinations were performed on interdialytic days. Clinical, laboratory, and echocardiographic parameters were compared. RESULTS: Twenty-four patients (13.1%) had atrial fibrillation. Patients with atrial fibrillation significantly differed in terms of higher age (64.9+/-9.8 vs. 49.9+/-16.6 years; p<0.001), higher frequency of coronary artery disease (37.5% vs. 10.7%; p=0.008), and lower serum albumin level (3.6+/-0.4 vs. 3.9+/-0.5 mg/dl; p=0.015). Echocardiographic examination showed significantly increased left and right atrial diameters (p<0.05), higher incidence of mitral and/or aortic calcification (p=0.033), increased systolic pulmonary artery pressure (38.1+/-6.1 vs. 28.5+/-5.5 mmHg, p<0.001) and E/E' ratio (11.8+/-3.8 vs. 8.8+/-4.7, p=0.008) in patients with atrial fibrillation. In multivariate logistic regression analysis, age (OR 1.09; 95% CI 1.00-1.17; p=0.036) and right atrial diameter (OR 1.19; 95% CI 1.05-1.35; p=0.008) were independent risk factors for the development of atrial fibrillation. CONCLUSION: Our findings highlight age and right atrial diameter as independent predictors of atrial fibrillation in hemodialysis patients. In addition, the E/E' ratio and pulmonary artery pressure may be considered new risk factors of atrial fibrillation in this population.

Assessment of atrial electromechanical delay, diastolic functions, and left atrial mechanical functions in patients with type 1 diabetes mellitus.

OBJECTIVE: The aim of this study was to evaluate atrial electromechanical coupling obtained by tissue Doppler imaging (TDI), left and right ventricular diastolic functions, and left atrial (LA) mechanical functions in patients with type 1 diabetes mellitus (DM-1). METHODS: A total of 43 patients with DM-1 (age 19.6 +/- 6.8 years) and 42 age- and gender-matched controls (age 19.5 +/- 6.4 years) were included. Atrial electromechanical coupling was measured with TDI and corrected for heart rate. P-wave dispersion (Pd) was calculated from the 12-lead electrocardiograms. Systolic and diastolic functions in both ventricles were assessed using conventional echocardiography and TDI. Myocardial performance index was calculated with TDI. LA maximal, minimal, and pre-systolic volumes were measured according to the biplane area-length method. LA mechanical function parameters were calculated. RESULTS: Intra- and interatrial electromechanical delays and Pd were significantly higher in patients with DM-1 compared with controls (P = .02, P < .0001, and P = 0.005, respectively). A-wave velocity and isovolumic relaxation time were higher and E/A ratio was lower in patients with DM-1 (P = .03, P = .03, and P = .003, respectively). According to TDI, systolic velocities and myocardial performance index values of both ventricles were comparable. Diastolic filling velocities of the left ventricle, including E(m) global, A(m) global, E(m)/A(m) ratio, and right ventricular A(m), were different between groups (P = .03, P = .02, P < .001, and P = .02, respectively). LA passive emptying fraction was decreased, and LA active emptying volume and LA active emptying fraction were increased in patients with DM-1 (P = .02, P = .001, and P < .0001, respectively). Interatrial electromechanical delay was positively correlated with the presence of DM-1, age, LA active emptying fraction, and Pd (P < .001, P = .007, P < .001, and P = .002, respectively), and was negatively correlated with E(m)/A(m) ratio and LA passive emptying fraction (P < .001 and P = .001, respectively). In multivariate analyses, age and DM-1 were independent predictors of interatrial electromechanical delay (P = .001 and P < .001, respectively). CONCLUSION: This study shows that intra- and interatrial electromechanical delays are prolonged diastolic functions of both ventricles and that LA mechanical functions are impaired in patients with DM-1. Age and the presence of DM-1 were independent factors of the interatrial electromechanical delay.