[Silent uncomplicated patent ductus arteriosus in children. Diagnosis with echo-Doppler]

Three cases are presented of patent uncomplicated ductus arteriosus in children, with short systolic murmur, in which the noninvasive diagnosis could not be possible without the echo-Doppler help. Although are cases with small shunts and hemodynamically well tolerated, its diagnosis and surgical treatment are essential in order to prevent the risk of bacterial endocarditis of those patients.