Coronary flow reserve is the capacity of the coronary circulation to
augment the blood flow in response an increase in myocardial metabolic
demands and has a powerful prognostic significance in different clinical
situations. It might assess with invasive and non-invasive technique.
Transthoracic echocardiography Doppler is an emerging diagnostic
technique, noninvasive, highly feasible, safe for patient and physician,
without radiation, able to detect macrovascular and microvascular
anomalies in the coronary circulation. This review aims to describe the
benefit and limits of noninvasive assessment of coronary flow reserve,
in particular his evaluation with echocardiography.