Clinical investigation of systemic-pulmonary collateral arteries.

Systemic-pulmonary collateral arteries are known to develop in children with congenital heart disease, chronic pulmonary infection, and prematurity. At present, these abnormal connections between the systemic and the pulmonary systems are thought to develop from the vascular plexus, which normally gives rise to the pulmonary and bronchial vasculature. The objective of this study was to review our patients with systemic-pulmonary collateral arteries and evaluate possible risk factors. The records of patients with systemic-pulmonary collateral arteries seen at our hospital over a 4-year period were retrospectively reviewed. They were grouped into one of the following five categories: premature, heart disease, pulmonary disease, healthy, and others. Age, gender, weight, and the results of echocardiography were recorded, as was the condition on follow-up. We reviewed the records of 284 patients: 130 premature, 13 heart disease, 30 pulmonary disease, 92 healthy, and 19 others. Over the same period, 3314 healthy 1-month-old infants had undergone echocardiography for health screening. Among the 92 healthy children with systemic-pulmonary collateral arteries, 52 were diagnosed at the health-screening exam. Therefore, we estimate the incidence of unsuspected systemic-pulmonary collateral arteries in healthy 1-month-old infants to be 1.57% (52/3314). We conclude that systemic-pulmonary collateral arteries may be present normally after birth and then gradually disappear. However, if there are certain predisposing factors, they may persist in order to augment pulmonary flow.