Doppler-Based Renal Resistive Index: A Comprehensive Review

Darmon, Michaël; Schnell, David; Zéni, Fabrice

doi:10.1007/978-1-4419-5562-3_31

Cited by 6 publications

(6 citation statements)

References 52 publications

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“…26,27 In addition to vascular properties and central pulse pressure, another important factor influencing the Dopplerbased RRI is renal blood flow. 28 The kidney is one of the peripheral territories with the highest perfusion because of its pivotal role in the metabolic balance. In fact, kidneys receive approximately 15%-25% of total cardiac output via renal arteries depending on the state of body and the volume of blood that the LV ejects.…”

Section: Discussionmentioning

confidence: 99%

Doppler Indexes of Left Ventricular Systolic and Diastolic Flow and Central Pulse Pressure in Relation to Renal Resistive Index

Kuznetsova¹,

Cauwenberghs²,

Knez³

et al. 2014

American Journal of Hypertension

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Section: Discussionmentioning

confidence: 99%

Doppler Indexes of Left Ventricular Systolic and Diastolic Flow and Central Pulse Pressure in Relation to Renal Resistive Index

Kuznetsova¹,

Cauwenberghs²,

Knez³

et al. 2014

American Journal of Hypertension

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“…Renal RI (RRI) is defined as a ratio of the difference between maximum and minimum (end-diastolic) flow velocity to maximum flow velocity derived from the Doppler spectrum of intrarenal (segmental/interlobar) arteries. Normal RI values in adults are in the range of 0.47–0.70 with a difference between two kidneys of <5–8 % [ 1 ]. Originally, RI was proposed by Pourcelot [ 2 ] to define the resistance of blood flow in peripheral arteries and meant to be useful in carotid artery stenosis assessment.…”

Section: Introductionmentioning

confidence: 99%

Renal resistive index as a marker of vascular damage in cardiovascular diseases

2013

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The article presents changeability of renal resistive index (RRI) in various cardiovascular diseases and considers the usefulness of the marker and interpretational difficulties of the index. The values of RRI are not specific to an individual disease, but in a selected group of patients, it seems to be a perfect marker of cardiovasculorenal changes and a predictor of rapid loss of a renal function. The RRI usually does not reflect the vascular resistance, but is dependent on total and local vascular bed compliance changing with age, in the course of consecutive diseases and the influence of drugs. Under specific conditions, RRI appears to be a good marker of vascular damage. This review summarizes current concepts in RRI interpretation against the cardiovascular pathologies, focusing on the vascular damage association with regard to the complex nature of RRI value variability.

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“…On examination of a muscle-supplying artery, values around 1 indicate increased vascular tone, whereas values below that indicate post-stenotic vasodilation. Micro-Doppler sonography (MDS) allows examination and monitoring of vascular blood flow in real-time, whereby resistance index (RI) is < 0.70 in average, even in rodents [ 51 , 52 ]. Additionally, in our study, the mean RI from t1 to t9 was 0.7 ±0.2.…”

Section: Discussionmentioning

confidence: 99%

Comparison of Hyperspectral Imaging and Microvascular Doppler for Perfusion Monitoring of Free Flaps in an In Vivo Rodent Model

Becker

Blatt²,

Pabst

et al. 2022

JCM

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To reduce microvascular free flap failure (MFF), monitoring is crucial for the early detection of malperfusion and allows timely salvage. Therefore, the aim of this study was to evaluate hyperspectral imaging (HSI) in comparison to micro-doppler sonography (MDS) to monitor MFF perfusion in an in vivo rodent model. Bilateral groin flaps were raised on 20 Sprague–Dawley rats. The femoral artery was transected on the trial side and re-anastomosed. Flaps and anastomoses were assessed before, during, and after the period of ischemia every ten minutes for overall 60 min using HSI and MDS. The contralateral sides’ flaps served as controls. Tissue-oxygenation saturation (StO2), near-infrared perfusion index (NPI), hemoglobin (THI), and water distribution (TWI) were assessed by HSI, while blood flow was assessed by MDS. HSI correlates with the MDS signal in the case of sufficient and completely interrupted perfusion. HSI was able to validly and reproducibly detect tissue perfusion status using StO2 and NPI. After 40 min, flap perfusion decreased due to the general aggravation of hemodynamic circulatory situation, which resulted in a significant drop of StO2 (p < 0.005) and NPI (p < 0.005), whereas the Doppler signal remained unchanged. In accordance, HSI might be suitable to detect MFF general complications in an early stage and further decrease MFF failure rates, whereas MDS may only be used for direct complications at the anastomose site.

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Doppler-Based Renal Resistive Index: A Comprehensive Review

Cited by 6 publications

References 52 publications

Doppler Indexes of Left Ventricular Systolic and Diastolic Flow and Central Pulse Pressure in Relation to Renal Resistive Index

Doppler Indexes of Left Ventricular Systolic and Diastolic Flow and Central Pulse Pressure in Relation to Renal Resistive Index

Renal resistive index as a marker of vascular damage in cardiovascular diseases

Comparison of Hyperspectral Imaging and Microvascular Doppler for Perfusion Monitoring of Free Flaps in an In Vivo Rodent Model

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