Abstract
Sir,I am delighted to have an opportunityto present the results of our study.In our previous Doppler study [1]we set normal values of renal circu-lation for a population of healthynewborns. Comparisons of Dopplerparameters of intraparenchymal (IP)renal arteries in various areas of thekidney in this age group have, how-ever,notyetbeenpublished.Availablesources of information are not suffi-cient [2, 3], and are not targeted to theneonatal period.Thirty physiologically normal termneonates (17 girls and 13 boys) withnegative perinatal history were en-rolled in this study. The examinationwas performed on day 4. No sedationwas required. Colour Doppler ultra-sound scanners were used with linear5–12-MHz multifrequency transduc-ers. Babies were examined in theprone position and kidneys werescanned from the dorsolateral view.Colour-flow mapping was performedto display renal blood flow. The lon-gest possible segment of the artery wasexamined under the optimal insonatingangle (less than 30°), keeping the sam-plevolumeassmallaspossible(1mm).IP arteries (arcuate and interlobulararteries) fromtheupperpole,themid-dlepartandthelowerpoleofthekidneywereassessed. Onemeasurement ofeacharterywasobtained.V
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