Key result
Doppler echocardiography in normal children established a mean renal artery peak systolic to minimal diastolic velocity ratio of 2.9, which varied inversely with age and size.
Cross-Sectional (n=20)
The study establishes normal values for renal artery Doppler waveforms in children, demonstrating that the A/B ratio is independent of resting central hemodynamics but varies inversely with age and size.
Provides pediatric renal artery Doppler reference values; leaves open diagnostic thresholds pending validation in disease states.
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 forward flow: A/B was independent of central hemodynamics within the resting normal range, varying inversely with age and size.
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Friedman et al. (1991) conducted a cross-sectional in Healthy (n=20). Doppler echocardiography of renal arteries was evaluated on Renal artery peak systolic to minimal diastolic velocity ratio (A/B). Doppler echocardiography in normal children established a mean renal artery peak systolic to minimal diastolic velocity ratio of 2.9, which varied inversely with age and size.
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