Hypertrophic Cardiomyopathy (HCM) is a disease that causes thickening of the heart walls, usually the left ventricle. The thickening can obstruct the blood flow out of the ventricle. A doppler echocardiogram is a test that can be used to see how the blood is flowing through the heart.
This medical illustration was published in a study about patients having an akinetic aneurysm of the apex of the heart and the significance of mid-left ventricular obstruction also being present. A doppler signal void will be seen on the ultrasound when this occurs. In the illustration you can see the progression of a patient with (A) mid-left ventricular hypertrophy and complete systolic emptying (CSE) and low velocity, followed by (B) mid- left ventricular obstruction and high velocity and then showing the (C) aneurysm of the apex with midventricular obstruction with a low velocity. The signal void can also be seen on the third doppler ultrasound.
The illustration of the heart is shown in an atypical view in order to match the orientation of the doppler echocardiogram.
Illustration created by: Courtney Arden White
Author and Publication:
Po, Jose Ricardo F. et al. “Doppler Systolic Signal Void in Hypertrophic Cardiomyopathy: Apical Aneurysm and Severe Obstruction without Elevated Intraventricular Velocities” Journal of the American Society of Echocardiography (2015)