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Background: Vitamin D and parathyroid hormone (PTH) are related but impact cardiovascular functions differently. Objectives: This study investigated the roles of PTH and vitamin D serum levels in the severity of coronary artery disease and left ventricular systolic function (LVSF). Methods: This cross-sectional study was conducted on 271 participants who underwent elective coronary angiography at Dr. Heshmat Hospital, selected by convenience sampling over four months. 25-hydroxyvitamin D (25 (OH) D) and PTH levels were obtained from patients' blood samples. Vitamin D levels were categorized into three categories. The SYNTAX score was used to evaluate the severity of coronary artery disease (CAD), classified across three categories. The chi-squared test, independent samples t-test, and multivariable logistic regression were used for statistical analysis. Data were analyzed by SPSS ver.21. Results: Diabetes, hypertension, dyslipidemia, and lower vitamin D levels were independent variables affecting patients' high-risk conditions. The highest SYNTAX score was in patients with vitamin D deficiency (P < 0.001). Patients with different ejection fractions did not have statistically significant differences in vitamin D (25.38 ± 14.23) and PTH levels (66.62 ± 17.39) (P = 0.4). The severity of CAD in patients with PTH > 40 was higher than in patients with PTH ≤ 40, but this was not statistically significant (P = 0.06). Conclusion: Our results showed an inverse relation between CAD and vitamin D. However, the CAD risk did not change with PTH levels. [ABSTRACT FROM AUTHOR]

Background: Left ventricular twist/torsion is believed to be a sensitive indicator of systolic and diastolic performance. To obtain circumferential rotation using tissue Doppler imaging, we need to estimate the time-varying radius of the left ventricle throughout the cardiac cycle to convert the tangential velocity into angular velocity. Objective: The aim of this study was to investigate accuracy of measured LV radius using tissue Doppler imaging throughout the cardiac cycle compared to two-dimensional (2D) imaging. Methods: A total of 35 subjects (47±12 years-old) underwent transthoracic echocardiographic standard examinations. Left ventricular radius during complete cardiac cycle measured using tissue Doppler and 2D-imaging at basal and apical short axis levels. For this reason, the 2D-images and velocity-time data derived and transferred to a personal computer for off-line analysis. 2D image frames analyzed via a program written in the MATLAB software. Velocity-time data from anteroseptal at basal level (or anterior wall at apical level) and posterior walls transferred to a spreadsheet Excel program for the radius calculations. Linear correlation and Bland-Altman analysis were calculated to assess the relationships and agreements between the tissue Doppler and 2D-measured radii throughout the cardiac cycle. Results: There was significant correlation between tissue Doppler and 2D-measured radii and the Pearson correlation coefficients were 0.84 to 0.97 (P<0.05). Bland-Altman analysis by constructing the 95% limits of agreement showed that the good agreements existed between the two methods. Conclusion: It can be concluded from our experience that the tissue Doppler imaging can reasonably estimate radius of the left ventricle throughout the cardiac cycle. [ABSTRACT FROM AUTHOR]

Background: Left ventricular twist/torsion is believed to be a sensitive indicator of systolic and diastolic performance. To obtain circumferential rotation using tissue Doppler imaging, we need to estimate the time-varying radius of the left ventricle throughout the cardiac cycle to convert the tangential velocity into angular velocity. Objective: The aim of this study was to investigate accuracy of measured LV radius using tissue Doppler imaging throughout the cardiac cycle compared to two-dimensional (2D) imaging. Methods: A total of 35 subjects (47±12 years-old) underwent transthoracic echocardiographic standard examinations. Left ventricular radius during complete cardiac cycle measured using tissue Doppler and 2D-imaging at basal and apical short axis levels. For this reason, the 2D-images and velocity-time data derived and transferred to a personal computer for off-line analysis. 2D image frames analyzed via a program written in the MATLAB software. Velocity-time data from anteroseptal at basal level (or anterior wall at apical level) and posterior walls transferred to a spreadsheet Excel program for the radius calculations. Linear correlation and Bland-Altman analysis were calculated to assess the relationships and agreements between the tissue Doppler and 2D-measured radii throughout the cardiac cycle. Results: There was significant correlation between tissue Doppler and 2D-measured radii and the Pearson correlation coefficients were 0.84 to 0.97 (P<0.05). Bland-Altman analysis by constructing the 95% limits of agreement showed that the good agreements existed between the two methods. Conclusion: It can be concluded from our experience that the tissue Doppler imaging can reasonably estimate radius of the left ventricle throughout the cardiac cycle. [ABSTRACT FROM AUTHOR]