Case Studies In Small Animal

Cardiovascular Medicine

Home Up .    Radiographs ECG 2D Echo PA Echo M-Mode Color Flow Doppler Liver Diagnosis

Case 12

M-Mode Echocardiogram

mmode.jpg (31042 bytes)

This M-mode echocardiogram shows the same features seen on the two-dimensional echocardiograms seen on the previous page. The right ventricular (RV) chamber is markedly enlarged and the right ventricular free wall (RVFW) is thickened. The left ventricular (LV) chamber is small, achieving a maximum diameter of about 2 cm (5 ml). The interventricular septum (IVS) is flat in diastole and then makes an abrupt motion toward the right ventricle in early systole as the left ventricular chamber becomes round as shown on the previous page. It then contracts toward the left ventricular free wall (LVFW) in systole. The end-systolic diameter appears to approach zero ("end-systolic cavity obliteration") as the left ventricle tries to squeeze every last drop of blood out of it.


Mark D. Kittleson, D.V.M., Ph.D. All rights reserved.