The renal resistive index: is it a misnomer?

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Progress in digital ultrasound technology and diffusion ofDoppler ultrasound evaluation of the kidney enable awidespread non-invasive evaluation of renal haemodynamics.Initially most attention has been paid to the studyof extraparenchymal renal arteries, mainly to detect renovasculardisease. However, this approach has low reproducibilityand accuracy. Therefore, interest has graduallymoved towards the duplex evaluation of intrarenal anatomy,where the best and most reliable signals are obtainedfrom the large segmental or interlobar arteries that rundirectly towards the transducer.Among the sonographic parameters used in the lastdecade, great emphasis has been placed on the intrarenalresistive index (RRI), which is defined as the dimensionlessratio of the difference between maximum and minimum(end-diastolic) flow velocity to maximum flow velocity.It has been used for a long time for the diagnostic andprognostic assessment of renovascular disease . Oneof the earliest prospective uses of the RRI was in theprediction of kidney function outcomes following interventionfor renal artery stenosis. In the pioneering study ofRadermacher et al., an RRI[0.80 is associated with pooreroutcomes, when surgery or angioplasty is used to correctrenal artery stenosis ...
Original languageEnglish
Pages (from-to)889-891
Number of pages3
JournalInternal and Emergency Medicine
Publication statusPublished - 2015

All Science Journal Classification (ASJC) codes

  • Internal Medicine
  • Emergency Medicine

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