Approximately 9 of 1000 live births have congenital heart disease, of these ~25%
have critical congenital heart disease (CCHD). Delayed or missed diagnosis of CCHD
may result in acute cardiovascular collapse. Echocardiography is a necessary
diagnostic tool but it’s cost is a severe limitation as a universal screening tool. Clinically
undetectable hypoxemia is present to some degree in most CCHD and this technique
can be used as a screening method for early detection.