Author/Editor		Cvitković-Kuzmić, Andrea; Brkljačić, Boris; Galešić, Krešimir
Title		Evaluation of intrarenal arterial Doppler spectra in healthy children
Translated title		Evaluacija spektra pri intrarenalni arterialni Doppler preiskavi pri zdravih otrocih
Type		članek
Source		Radiol Oncol
Vol. and No.		Letnik 33, št. 2
Publication year		1999
Volume		str. 87-94
Language		eng
Abstract		Background. The aim of the study was to determine the features of intrarenal arterial Doppler spectra in healthy children by measuring acceleration time (AT) and resistance index (RI). Subjects and methods. RI and AT values were compared between different age groups of children and with normal RI values in adult population. Color duplex Doppler sonography of the intrarenal arteries, using Acuson 128XP10 scanner, was performed in 150 children (300 kidneys), with no clinical or laboratory pathological changes of the urinary tract. All children were classified into three age groups: (1) 52 children between 2 to 6 years of age; (2) 48 children from > 6 to 11 years of age; (3) 50 children from >11 to 16 years of age. Results. The mean RI +/- l. S.D. value in the group I was 0.70 +/- 0.03, in the group 110.625 +/- 0.025 and in the group 1110.585 +/- 0.03. AT ranged from 0.04-0.09 seconds and the mean value of 0.07 +/- 0.01 seconds was the same for all three groups. Conclusions. RI in early childhood is considerably higher as compared to older children and the adult population; after the age of six, RIs become equal to those in the adults. The utilization of RI=0.70, as a threshold value for the increased renal vascular resistance in adults, can be also applied to children over 6 years. The detection of renal artery stenosis on the basis of the analysis of acceleration time is the same in children and in adults.
Summary		Izhodišča. Namen raziskave je bil določiti značilnosti spektra pri Dopplerjevi preiskave intrarenalnih arterij zdravih otrok. Merili smo pospeševalni čas (AT) in rezistenčni indeks (RI). Bolniki in metode. Vrednosti RI in AT smo primerjali med skupinami otrok različne starosti, vrednosti RI pa z vrednostmi pri odraslih. Pri ultrazvočni preiskavi intrarenalnih arterij z dvojnim Dopplerjem smo uporabili ultrazvočni aparat Acuson 128XP10. Preiskavo smo opravili na 150 otrocih (300 ledvicah), ki niso imeli kliničnih ali patomorfoloških sprememb urinarnega trakta. Otroci so bili glede na starost razvrščeni v 3 skupine: (1) 52 otrok je bilo starih od 2 do 6 let; (2) 48 otrok nad 6 do 11 let; (3) 50 otrok pa nad 11 do 16 let. Rezultati. V skupini I je bila povprečna vrednost RI (+/- l.S.D.) 0,70 (+/- 0.03), v skupini II 0,625 (+/- 0,025) in v skupini III 0,585 (+/- 0,03). Vrednosti AT so bile od 0,04 do 0,09 sekund, povprečna vrednost pa je bila pri vseh treh skupinah enaka 0,07 (+/- 0,01) sekund. Zaključki. Pri mlajših otrocih je RI znatno višji kot pri starejših in pri odraslih; po 6. letu starosti postanejo vrednosti RI pri otrocih enake vrednostim odraslih. RI=0,70, ki velja kot mejna vrednost za povečan upor v ledvičnem žilju pri odraslih, velja tudi pri otrocih, starejših od 6 let. Z analizo pospeševalnega časa lahko pri otrocih in odraslih na enak način ugotovimo zožitev glavne ledvične arterije.
Descriptors		RENAL ARTERY ULTRASONOGRAPHY, DOPPLER, COLOR CHILD