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The clinical use of Renal Doppler ultrasonography is spreading widely because it can assess renal blood flow in a non-invasive evaluation. It is recommended as a screening examination for patients with suspected renovascular hypertension [1]. The renal resistive index (RRI) derived from intrarenal Doppler waveforms has also been drawing attention. In this issue of Pulse, Cauwenberghs and Kuznetsova [2] presented a review article that focused on the RRI with particular reference to its determinants and prognostic significance. We would like to make some comments about the clinical meanings of the RRI and the article by Cauwenberghs and Kuznetsova [2].

Comment on the Paper by Cauwenberghs and Kuznetsova Entitled ‘Determinants and Prognostic Significance of the Renal Resistive Index'