The flow velocity pattern in the descending aorta, renal arteries, and celiac and superior mesenteric arteries was studied with pulsed Doppler in eight premature babies with symptomatic ductus arteriosus before and after ductal closure, as compared to nine premature babies without ductus arteriosus. There was a decrease or reversal of flow in diastole in the above arteries in babies with ductus and diastolic flow reappeared after ductal closure. This diastolic steal phenomenon has not been previously demonstrated in the abdominal arteries. It may contribute to proneness to ischemic damage of abdominal organs in premature babies.
A pilot study of the Doppler renal arterial flow pattern was done in a group of 38 normal children, including 11 neonates age 2 weeks or less, 10 infants age 2 weeks to 1 year, and 17 children age 1 year and over. The appearance time, acceleration time, end-diastolic to peak-systolic velocity ratio (d/S), and diastolic to systolic flow ratio (A2/A1) increased with age. Another four patients with acute renal failure showed a characteristic absence of blood flow in the whole or late-diastolic phase. Diastolic flow reappeared with recovery. Doppler renal arterial flow pattern may be a noninvasive investigation of diagnostic and prognostic value.
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