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Walk the Even Hospital Database by book and chapter — the raw source passages that ground Ask, DDx, and the rest.
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©2013 UpToDate ® Print Email Determination of left ventricular myocardial mass Orthogonal apical echocardiographic views are digitized in systole and diastole and the computer analyzes the tracings according to two volume algorithms and, using the truncate ellipsoid method, computes the internal dimensions used in the calculation of mass. By this method the ejection fraction is borderline normal at 55 percent and the mass is increased at 220 g; assuming a body surface area of 2 msq, the mass is 110 g/msq, well over two standard deviations from the mean of 95 g/msq. The end systolic volume index is 33 ml/msq and also exceeds the bounds for normality. By comparing the diastolic to the systolic area tracings it can be seen that the descent of the base is less than 14 mm. Since increased left ventricular mass imparts a lower wall stress and afterload, the borderline ejection fraction becomes clearly abnormal (unless blood pressure is greatly elevated).