There are two forms of cardiac ultrasound:
two-dimensional (2-D) and M-mode echocardiography, which is commonly used and available;
and Doppler ultrasound (spectral and colour flow mapping), which is usually confined
to centres with a trained cardiologist and requires considerable skill and knowledge
to perform and interpret.
By combining the various aspects of echocardiography
it is now possible, invasively, to accurately diagnose cardiac disease, detect abnormal
blood flow (murmurs), quantify ventricular function and determine the severity of
lesions to offer a prognosis.