RESUMO
Increased resistance in the pulmonary vessels in children with ventriculo-atrial shunts is a rare and often unrecognized permanent complication. We report 2 children in whom this diagnosis was detected by two-dimensional echocardiography. The first patient received a ventriculo-atrial shunt at age 9 days for congenital internal hydrocephalus. At 17 months it had to be replaced because of infection of the efferent catheter limb. At 22 months at a routine follow-up the echocardiographic diagnosis of pulmonary hypertension was made. Invasive studies confirmed the presence of irreversible increased resistance in the pulmonary circulation. The second patient received a ventriculo-atrial shunt at age 13 months because of a cerebral cyst. After repeated catheter infections, at 28 months a ventriculo-peritoneal shunt was placed. At age 4 years the diagnosis of pulmonary hypertension was made by routine echocardiography. This finding was confirmed by invasive studies. The left pulmonary artery was completely occluded. Both patients had developed microemboli, caused or aggravated by catheter sepsis, in the second case probably through contiguous clot growth up to complete occlusion of the left pulmonary artery. Therapeutic measures seemed not to be indicated. Two-dimensional echocardiography proved to be a reliable method for diagnosing increased resistance and pulmonary hypertension. We recommend routine echocardiography for follow-up in all children with ventriculo-atrial shunts.