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      Left Ventricular Dysfunction in Subjects with Mild Secondary Hyperparathyroidism Detected with Pulsed Wave Tissue Doppler Echocardiography


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          Aims: To assess left ventricular function by conventional and pulsed wave tissue Doppler (PWTD) echocardiography in subjects with mild secondary hyperparathyroidism, and to evaluate whether PWTD would be more sensitive than conventional echocardiography in detecting subtle changes in LV systolic and diastolic function. Methods: In the fifth Tromsø study (2001) serum PTH and calcium were measured in 7,954 subjects. One hundred subjects with secondary hyperparathyroidism (SHPT; serum PTH >6.40 pmol/l and serum calcium <2.40 mmol/l) and 106 control subjects with normal PTH and calcium levels and with no history of cardiovascular disease were examined at the follow-up 6–12 months later. Results: Conventional transthoracic echocardiography and PWTD of mitral annulus were successfully performed in 83 cases and 88 controls. At follow-up mean serum PTH values were 6.0 ± 2.2 versus 3.2 ± 1.3 pmol/l (p < 0.05) and mean calcium 2.28 ± 0.10 versus 2.33 ± 0.08 mmol/l (p < 0.05) in cases and controls, respectively. Unpaired t test and multiple linear regression analyses were used. No significant differences in conventional echocardiographic parameters were found. However, PWTD showed reduced systolic velocity in septal, lateral and anterior mitral annulus (p < 0.05) and also reduced early diastolic velocity in septal and anterior mitral annulus (p < 0.05). Conclusion: Subjects with mild SHPT have impaired left ventricular long axis function as evaluated by PWTD compared to conventional echocardiography. PWTD seems to be a more sensitive tool in detecting minor changes in left ventricular function and the new modality should routinely be included in studies evaluating left ventricular function, especially the long axis function.

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          Parathyroid hormone and left ventricular hypertrophy.

          A relation between left ventricular hypertrophy and parathyroid hormone (PTH) has been described in patients with end stage renal disease and secondary hyperparathyroidism. In vitro studies indicate a hypertrophic effect of PTH on cardiomyocytes. The purpose of this study was to examine the relation between PTH and left ventricular hypertrophy in a general population. The fourth Tromsø study (1994-1995) included 27159 subjects. 2700 had serum PTH measurement and left ventricular mass by height (LVMH) estimated with M-mode echocardiography. Among these, 980 males and 1060 females were without known cardiovascular disease or valvular heart disease and did not use blood pressure medication. In this group, using a multiple linear regression model, body mass index (BMI), followed by systolic blood pressure, were found to be the strongest predictors of LVMH. In males older than 59 years and females younger than 60 years, PTH was a significant and positive predictor of LVMH (P<0.05). The relation between PTH and LVMH was not linear. There was a sharp increase in LVMH (both unadjusted and adjusted for age, BMI, and systolic blood pressure) in the upper PTH percentiles with the breaking point being the 95 percentile for men and the 98 percentile for women. Subjects in these upper PTH ranges had 12-17% higher adjusted LVMH than those in the lower 10% of the PTH range. This effect was not related to serum calcium level. If examining separately those with PTH levels within +/-2SD from the mean, no relation between PTH and LVMH was found. PTH is an independent predictor of LVMH in males older than 59 years and females younger than 60 years. This effect is only seen when PTH is substantially elevated and may then be involved in cardiac pathophysiology.
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            Left ventricular long axis function in diastolic heart failure is reduced in both diastole and systole: time for a redefinition?

            To test the hypothesis that, when measured in the long axis, left ventricular systolic function is abnormal in patients with diastolic heart failure. A case-control study. University teaching hospital (tertiary referral centre). 68 patients with heart failure, 29 with a left ventricular ejection fraction (LVEF) of > 0.45 and diastolic dysfunction (diastolic heart failure), 39 with an LVEF of
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              Doppler echocardiographic measurement of low velocity motion of the left ventricular posterior wall.

              A new noninvasive method using pulsed Doppler echocardiography was developed to assess left ventricular (LV) posterior wall motion dynamics. Seventeen normal subjects and 23 patients undergoing cardiac catheterization were prospectively studied. The sample volume was placed within the LV posterior wall endocardium just apical to the mitral valve sulcus using a posteriorly angulated low parasternal view. The wall filter was set at 100 Hz to record the low velocities of the LV posterior wall motion. The Doppler signal was morphologically similar to the rate of change of the LV posterior wall endocardium excursion obtained by a digitized M-mode echocardiogram, and showed 3 major waves: a systolic wave (S), an early diastolic wave (E) and a late diastolic wave (A). The peak velocities of LV posterior wall endocardium excursion were also determined by M-mode echocardiographic technique. We found a significant linear correlation between peak E-wave velocity and M-mode peak diastolic endocardial velocity (r = 0.90, p less than 0.001) and between peak S-wave velocity and M-mode peak systolic endocardial velocity (r = 0.81, p less than 0.001). M-mode peak systolic endocardial velocity showed an important overlap between control subjects and patients with normal and patients with abnormal LV posterior wall motion on the angiogram. In contrast, peak S-wave velocity was a better discriminator, and a peak S-wave velocity less than 7.5 cm/s was associated with abnormal LV posterior wall motion with an 83% sensitivity, 100% specificity and 95% accuracy. In patients with coronary artery disease but normal systolic LV posterior wall motion and normal global systolic LV function, peak S-wave velocity was not different when compared to control subjects. Peak E-wave velocity and E/A were significantly lower than in control subjects (p less than 0.01) and peak A-wave velocity was greater (p less than 0.01). In conclusion, these data suggest that pulsed Doppler echocardiography can be used for the direct analysis of LV posterior wall instantaneous low velocities and appears to be more informative than M-mode technique for systolic measurements. Thus, detection of abnormal LV posterior wall diastolic motion by pulsed Doppler echocardiography may, upon additional confirmation, be used as a new noninvasive method to gain insight into global LV diastolic performance.

                Author and article information

                S. Karger AG
                November 2005
                24 November 2005
                : 105
                : 1
                : 1-8
                Departments of aCardiology and bClinical Chemistry, University Hospital of North Norway, and cInstitute of Clinical Medicine, University of Tromsø, Tromsø, Norway
                88264 Cardiology 2006;105:1–8
                © 2006 S. Karger AG, Basel

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                Page count
                Figures: 1, Tables: 4, References: 33, Pages: 8
                General Cardiology


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