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Inflow Velocity (inflow + velocity)
Kinds of Inflow Velocity Selected AbstractsEvaluation of Subendocardial and Subepicardial Left Ventricular Functions Using Tissue Doppler Imaging after Complete RevascularizationECHOCARDIOGRAPHY, Issue 2 2009Hüseyin Sürücü M.D. Objective: We aim to evaluate subepicardial and subendocardial left ventricular (LV) functions in patient single coronary artery lesion at early stage after percutaneous coronary intervention (PCI). Additionally, a comparison of LV functions between patients and control cases was aimed. Method: Patients with culprit left anterior descending (LAD) lesion (n = 25) and subjects with normal coronary angiography (n = 25) were evaluated. Patients underwent PCI and at least one coronary stent was placed. After PCI, the pulsed-wave tissue Doppler imaging (pw-TDI) parameters taken from subepicardial and subepicardial layers were compared among the patients. Results: Left atrium (P = 0.050), LV end-diastolic (P = 0.049), and end-systolic (P = 0.006) diameters were larger compared to the control group. LV inflow velocities were not different between the patient and the control group. But, the myocardial performance index was different (P = 0.049). The systolic and diastolic pw-TDI parameters were apparently different between the patient and the control group. While the systolic pw-TDI parameters did not change, the diastolic pw-TDI parameters taken from both subepicardial (circumferential contraction) and subendocardial layers (longitudinal contraction) improved after PCI. After PCI, it was shown that while Ea velocity (P = 0.012) taken from the subendocardial layer increased, IVRa velocity (P < 0.001) taken from the subepicardial layer decreased. Conclusion: In our study, it could be said that LV, left atrium, and aortic valve diameter increase in patients with coronary artery disease. The systolic and diastolic functions were impaired at subendocardial and subepicardial layers. These dysfunctions can be easily presented with pw-TDI. Although systolic dysfunction persists, diastolic dysfunction improves at early stage after PCI. [source] Effect of reduced total blood volume on left ventricular volumes and kinetics in type 2 diabetesACTA PHYSIOLOGICA, Issue 1 2010S. Lalande Abstract Aim:, Although impaired left ventricular (LV) diastolic function is commonly observed in patients with type 2 diabetes, it remains unclear whether the impairment is caused by altered LV relaxation or changes in LV preload. The purpose of this study was to examine the influence of LV function and LV loading conditions on stroke volume in men with type 2 diabetes. Methods:, Cardiac magnetic resonance imaging scans were performed in eight men with type 2 diabetes and 11 non-diabetic men matched for age, weight and physical activity level. Total blood volume was determined with the Evans blue dye dilution technique. Results:, End-diastolic volume (EDV), the ratio of peak early to late mitral inflow velocity (E/A) and stroke volume were lower in men with type 2 diabetes than in non-diabetic individuals. Peak filling rate and peak ejection rate were not different between diabetic and non-diabetic individuals; however, men with type 2 diabetes had proportionally longer systolic duration than non-diabetic individuals. Heart rate was higher and total blood volume was lower in men with type 2 diabetes. The lower total blood volume was correlated with a lower EDV in men with type 2 diabetes. Conclusions:, Men with type 2 diabetes have an altered cardiac cycle and lower end-diastolic and stroke volume. A lower total blood volume and higher heart rate in men with type 2 diabetes suggest that changes in LV preload, independent of changes in LV relaxation or contractility, influence LV diastolic filling and stroke volume in this population. [source] Tissue inhibitor of metalloproteinse-1 is a marker of diastolic dysfunction using tissue doppler in patients with type 2 diabetes and hypertensionEUROPEAN JOURNAL OF CLINICAL INVESTIGATION, Issue 1 2005M. H. Tayebjee Abstract Background, Tissue inhibitor of metalloproteinase-1 (TIMP-1) is associated with increased fibrosis of the extracellular matrix (ECM). Myocardial stiffness is a feature of diastolic dysfunction. We assessed circulating TIMP-1 as a marker of diastolic dysfunction in patients with type 2 diabetes mellitus (DM) and hypertension, who were compared with healthy controls. Methods, We recruited 54 patients (43 males; mean age 68 ± 5 years) with treated type 2 DM (i.e. controlled glycaemia, hypertension, hyperlipidaemia), 35 (30 males; 69 ± 8 years) treated nondiabetic hypertensives, and 31 healthy controls (18 males; 66 ± 5 years). Circulating TIMP-1 was measured by ELISA. Using transthoracic echocardiography, the early (E) diastolic mitral inflow velocity was measured with pulse wave Doppler, and the early mitral annular velocity (e,), a recognized index of diastolic relaxation, was measured with tissue Doppler. The E/A ratio was also calculated and isovolumic relaxation time measured. Results, Mean e, levels differed significantly between controls, diabetics and hypertensives (P < 0·0001). Circulating TIMP-1 was significantly different between patients and controls (P = 0·006), but there was no statistically significant difference between the DM and hypertension group. In both groups, only e, was negatively correlated with TIMP-1 levels, with a stronger correlation among the hypertensive patients (Spearman r = ,0·544, P = 0·001) when compared with the diabetic group (r = ,0·341, P = 0·011). Conclusion, Diastolic relaxation is impaired in diabetes and hypertensive patients. The relationship between TIMP-1 and e, may reflect increased myocardial fibrosis and consequent diastolic dysfunction, which may be more prominent in hypertension. [source] MATHEMATICAL MODEL FOR THE SURVIVAL OF LISTERIA MONOCYTOGENES IN MEXICAN-STYLE SAUSAGEJOURNAL OF FOOD SAFETY, Issue 4 2005M.N. HAJMEER ABSTRACT Survival of Listeria monocytogenes in chorizos (Mexican-style sausages) was modeled in relation to initial water activity (aw0) and storage conditions using the Weibull cumulative distribution function. Twenty survival curves were generated from chorizos formulated at aw0 = 0.85,0.97 then stored under four temperature (T) and air inflow velocity (F) conditions. The Weibull model parameters (, and ,) were determined for every curve. Predicted survival curves agreed with experimental curves with R2 = 0.945,0.992. Regression models (R2 = 0.981,0.984) were developed to relate , and , to operating conditions. The times to one- and two-log reduction in count (t1D and t2D) were derived from the Weibull model in terms of , and ,. A parametric study revealed that L. monocytogenes survival was most sensitive to aw0 between 0.90 and 0.95. The inactivation of L. monocytogenes could be maximized with higher T and lower aw0; however, F did not significantly influence survival. [source] B-type natriuretic peptide as a marker for cardiac dysfunction in anthracycline-treated childrenPEDIATRIC BLOOD & CANCER, Issue 6 2007Sanjeev Aggarwal MD Abstract Background Anthracyclines (AC) are useful antineoplastic agents, whose utility is limited by progressive cardiotoxicity. Our purpose was to evaluate plasma B-type natriuretic peptide (BNP), as a screening test for detecting late cardiac dysfunction in AC-treated children and to determine the prevalence of late cardiac dysfunction at low cumulative AC doses. Materials and Methods This was a prospective study in which patients who had completed AC therapy at least 1 year earlier, underwent a detailed echocardiogram and a simultaneous BNP level. Cardiac dysfunction was defined as any one of the following: shortening fraction (FS) <29%, rate corrected velocity of circumferential fiber shortening (VCFc) <0.9 c·sec,1, end systolic wall stress (ESWS) >60 g·cm,2, abnormal VCFc: ESWS ratio or decreased mitral inflow velocity (E/A) ratios, compared to age-specific norms. Results The cohort (n,=,63) included 37 males with a median age of 13.1 years (range, 6.5,26.5 years). Cardiac dysfunction was found in 26 (41%) patients and in 40% of patients who received cumulative doses <150 mg·m,2. ESWS was the most common abnormality. Mean BNP levels in the subset with abnormal function were significantly higher than the normal group (23.4,±,25.3 vs. 14.2,±,8.9 pg·ml,1, P,=,0.02). Conclusions Plasma BNP was significantly elevated in AC-treated patients with late cardiac dysfunction, although there was considerable overlap of levels between groups with and without cardiac dysfunction. BNP may need further evaluation as a serial index of cardiac function in this population. Cardiac dysfunction was observed in a significant proportion of patients, even at low cumulative AC doses. Pediatr Blood Cancer 2007;49:812,816. © 2006 Wiley-Liss, Inc. [source] ORIGINAL RESEARCH,ERECTILE DYSFUNCTION: Independent Determinants of Coronary Artery Disease in Erectile Dysfunction PatientsTHE JOURNAL OF SEXUAL MEDICINE, Issue 4pt1 2010Shih-Tai Chang MD ABSTRACT Introduction., There is growing evidence of a link between erectile dysfunction (ED) and coronary artery disease (CAD). Aims., The purpose of this study was to explore the independent determinants of CAD in ED outpatients. Methods., This study enrolled 243 patients, ranging in age from 21 to 81 years old, suffering from ED as diagnosed by the International Index of Erectile Function (IIEF) scores. All patients underwent exercise stress tests or thallium-201 single-photon emission computed tomography perfusion imagings. Based on examination results, patients were divided into study (22 patients with a positive finding) and control groups (221 patients with a negative finding). Main Outcome Measures., The differences of demographic characteristics, biochemical profiles, pro-inflammatory and inflammatory markers, and echocardiographic characteristics between study and control group were compared. Results., The age, presence of DM and current smoking status were significant high in the study group. A significant lower high-density lipoprotein (HDL) cholesterol level, a higher percentage of HDL cholesterol level < 40 mg/dL, and a higher apo-lipoprotein B/A1, high sensitive C-reactive protein (hs-CRP) and homocysteine found in the study group. The Framingham cardiac risk scores, the ratio of mitral inflow velocity to early diastolic velocity in the annulus derived by tissue Doppler imaging (E/Et), the ratio of E/Et , 15, the value of carotid intima-media thickness (IMT), and IMT , 1 mm were higher in study group than in the control group. In stepwise multiple logistic regression analysis, a high waist-to-hip ratio (WHR), high IMT, high E/Et, hs-CRP levels, LDL cholesterol , 130 mg/dL, smoking status, and the presence of DM and metabolic syndrome (MS) were independent determinants of CAD in ED patients. Conclusions., This study first shows the independent determinants of CAD in ED outpatients. This novel finding may improve the screening of low-risk ED patients for CAD. Chang S-T, Chu C-M, Hsu J-T, Hsiao J-F, Chung C-M, Ho C, Peng Y-S, Chen P-Y, and Shee J-J. Independent determinants of coronary artery disease in erectile dysfunction patients. J Sex Med 2010;7:1478,1487. [source] | ||||||||||