Evaluation of cardiac output by using modified Simson (2D) versus Teicholz (M-mode) echocardiography methods in dogs
2012
Laizane, D., Latvia Univ. of Agriculture, Jelgava (Latvia). Faculty of Veterinary Medicine | Duritis, I., Latvia Univ. of Agriculture, Jelgava (Latvia). Faculty of Veterinary Medicine
An accurate assessment of left ventricular (LV) systolic function is of central importance to the diagnosis and management of heart disease. Currently two echocardiography methods are most often used for the assessment of ventricular function in veterinary medicine – Teicholz and modified Simpson‘s method of discs (SMOD). Teicholz method uses M-mode echocardiographic measurements for calculation of left ventricular volumes and cardiac output. The Teicholz formulas for systolic and diastolic volumes are widely used, as they calculate LV volume using only LV dimension, but its accuracy depends on the accuracy of geometric assumptions about LV shape that may assess geometric changes occurring in diseases such as Dilated Cardiomyopathy (DCM) less accurately. Accordingly, the American Society of Echocardiography (ASE) recommends not to use linear measurements to calculate LV volumes and EF for clinic practice. The most commonly used 2D measurement for volume measurements in human beings is the biplane Simpson‘s method of discs (SMOD), currently the recommended method of choice according to the ASE. Using SMOD heart volume is measured as the summation of parallel cylinders, whose diameters are derived from endocardial border tracing performed on 1 or 2 orthogonal LV apical views. The objective of this study is to compare technical aspects of these two methods on dogs of different breeds and varying body sizes.
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