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Doppler waveforms in the renal arteries of normal children
Author(s) -
Friedman Deborah M.,
Schacht Robert G.
Publication year - 1991
Publication title -
journal of clinical ultrasound
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.272
H-Index - 61
eISSN - 1097-0096
pISSN - 0091-2751
DOI - 10.1002/jcu.1870190704
Subject(s) - medicine , hemodynamics , diastole , doppler effect , cardiology , renal artery , blood flow , waveform , vascular resistance , doppler echocardiography , flow velocity , peripheral , blood pressure , anatomy , kidney , physics , quantum mechanics , astronomy , voltage , relaxation (psychology)
Blood velocity waveforms in peripheral arteries vary such that decreasing vascular resistance results in a relative increase in diastolic velocity at steady state. We measured blood velocity in renal arteries of 20 children (age: 119 months ± 37 months; weight: 38 kg ± 15 kg) to establish normal values, and to explore the relationship between these waveforms and central hemodynamics. Using image‐directed pulsed Doppler echocardiography, M‐mode measurements and cardiac index were recorded. Renal hila were visualized via the flank for Doppler sampling. Peak systolic velocity ( A ) and minimal diastolic velocity ( B ) were determined. The results (mean ± SD) were as follows: Renal artery A/B = 2.9 ± 0.74 (range 1.9 to 5.1). Characteristic waveforms were identical bilaterally and had continuous diastolic foward flow: A/B was independent of central hemodynamics within the resting normal range, varying inversely with age and size.