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Index of resistivity of renal vessel

Sara Samoni, Federico Nalesso, Mario Meola, Gianluca Villa, Massimo De Cal, Silvia De Rosa, Ilaria Petrucci, Alessandra Brendolan, Mitchell H Rosner, Claudio Ronco
An increase of glomerular filtration rate after protein load represents renal functional reserve (RFR) and is due to afferent arteriolar vasodilation. Lack of RFR may be a risk factor for acute kidney injury (AKI), but is cumbersome to measure. We sought to develop a non-invasive, bedside method that would indirectly measure RFR. Mechanical abdominal pressure, through compression of renal vessels, decreases blood flow and activates the auto-regulatory mechanism which can be measured by a fall in renal resistive index (RRI)...
2016: Frontiers in Physiology
Noriko Iida, Yoshihiro Seo, Seika Sai, Tomoko Machino-Ohtsuka, Masayoshi Yamamoto, Tomoko Ishizu, Yasushi Kawakami, Kazutaka Aonuma
OBJECTIVES: This study clarified the characteristics of intrarenal Doppler ultrasonography (IRD) profiles and their prognostic implications in heart failure (HF). BACKGROUND: IRD can assess intrarenal hemodynamics. METHODS: Initially, 224 patients with HF were prospectively enrolled; 151 inpatients were enrolled during hospitalization for HF, and 73 were outpatients in our institution. In IRD profiles of interlobar vessels, the arterial resistance index (RI), venous impedance index (VII), and intrarenal venous flow (IRVF) pattern were assessed...
August 2016: JACC. Heart Failure
F Sui, Y Zheng, W-X Li, J-L Zhou
OBJECTIVE: The purpose of the study is to further investigate the effects of increased intra-abdominal pressure (IAP) on renal hemodynamics and renal perfusion, and to evaluate the renal cortical and sublingual microcirculation by sidestream dark field (SDF) imaging, both with a porcine model. MATERIALS AND METHODS: IAP was increased stepwise to 10, 15, 20, 25 mmHg, during which hemodynamic parameters, urinary output, renal contrast-enhanced ultrasound (CEUS), sublingual and renal SDF videos were all recorded from 12 pigs...
2016: European Review for Medical and Pharmacological Sciences
V Shoshiashvili, A Tataradze, L Beglarishvili, L Managadze, A Chkhotua
The goal of the study was to compare effectiveness of regional and local anesthesia in dialysis arterio-venous fistula (AVF) operations. It was a prospective, randomized study. 103 patients with end stage renal disease underwent AVF operations on upper limb. The patients have been randomly divided in two groups. Group I: 49 patients in whom the operations have been done under the local anesthesia; and Group II: 54 patients in whom the operation has been performed under the vertical infraclavicular block. Duplex sonography evaluation of upper arm vessels was performed pre-operatively and at 1, 3 and 6 months postoperatively...
December 2015: Georgian Medical News
O V Bessonova, A V Golomidov, A V Ivanova, A E Furman, E V Grigoriev
UNLABELLED: Current diagnosis of acute kidney injury (AKI) is one of the most pressing problems in the newborn in critical condition. OBJECTIVE: To determine the diagnostic value of indicators of renal blood flow as a marker of acute kidney injury in critically ill newborns. MATERIALS AND METHODS: The study included 40 infants in critical condition. A clinical assessment of severity of the condition during admission was carried out with Neonatal Multiple Organ Dysfunction Score (NEOMOD) and Neonatal Therapeutic Intervention Scoring System (NTISS)...
May 2015: Anesteziologiia i Reanimatologiia
V E Gazhonova, A S Zykova, A A Chistiakov, S V Roshchupkina, M D Romanova, T N Krasnova
AIM: To study a relationship between main renal and intraparenchymal renal arterial resistance indices (RIs) measured by Doppler ultrasonography and clinical and laboratory parameters and to determine their prognostic value in estimating the progression of chronic kidney disease (CKD). SUBJECTS AND METHODS: The investigation enrolled 53 CKD patients divided into groups: glomerular and interstitial diseases. Glomerular filtration rate (GFR) calculated using the CKD-EPI formula, proteinuria (PU) severity, kidney sizes, renal parenchyma thickness, parenchyma/collecting index, and main and intrarenal vessel RIs were determined at the first hospitalization...
2015: Terapevticheskiĭ Arkhiv
Rada N Gancheva, Atanas I Kundurdjiev, Mariana G Ivanova, Todor G Kundurzhiev, Rasho K Rashkov, Zlatimir G Kolarov
The aim of the study was to establish the functional disorder in the blood circulation of gout patients with a method that shows early damage of the heart and vascular structures. A total of 117 patients were examined cross-sectionally by a complex multimodal ultrasonography and were divided into four groups: 37 healthy controls, 24 asymptomatic hyperuricemia, 36 gout without tophi and 20 gouty tophi. With pulsed Doppler, common carotid artery resistive index (CCARI) and parameters of the transmitral blood flow were determined: the ratio between maximal early and late flow velocities (E/A ratio) and deceleration time (DT)...
August 2015: Rheumatology International
Attilio Ignazio Lo Monte, Giuseppe Damiano, Vincenzo Davide Palumbo, Gabriele Spinelli, Giuseppe Buscemi
Automatic vascular staplers for vascular anastomoses in kidney transplantation may dramatically reduce the operative time and, in particular, warm ischemia time, thus increasing the outcome of transplantation. Ten pigs underwent kidney auto-transplantation by automatic anastomotic device. Kidneys were collected by laparotomy with selective ligations at the renal hilum and perfused with cold storage solution. To overcome the shortage in length of renal hilum, a tract of the internal jugular vein was harvested to increase the length of the vessels...
October 2015: Artificial Organs
L O Severgina, S I Gurevich
OBJECTIVE: To confirm the key role of vascular malformation by ultrasound examination and to make a more detailed study of the manifestations of dysnephro- and angiogenesis. SUBJECTS AND METHODS: The study enrolled 34 children aged 3 days to 7 years with congenital hydronephrosis, who were divided into 3 groups in accordance with the degree of renal hemodynamic disorders, the criterion for which was a resistive index (RI). RESULTS: The performed electron microscopic study revealed the signs of malformed vessels of all diameters, as well as hypoplastic changes in the renal parenchyma in children of all ages in all the groups...
November 2014: Arkhiv Patologii
B G Iskenderov, Z M Budagovskaia, O N Sisina
AIM: To estimate effect of combined perindopril/amlodipine therapy on structural and functional characteristics of the heart and blood vessels, intrarenal hemodynamics in patients with essential arterial hypertension (AH) depending on the degree of renal dysfunction. MATERIAL AND METHODS: 112 patients (63 men and 49 women) were included in the study; 35 of them (group 1) had the glomerular filtration rate (GFR) 90 ml/min/1.73 m2 or higher, 43 (group 2)--60-89 ml/min/1...
2013: Klinicheskaia Meditsina
Tuğrul Örmeci, Tijen Alkan-Bozkaya, Arda Özyüksel, Cihangir Ersoy, Akif Ündar, Atıf Akçevin, Halil Türkoğlu
The objective of this clinical study is to determine whether correlation exists among cerebral and renal near-infrared spectroscopy (NIRS) measurements, renal Doppler ultrasonography parameters (resistive index, peak systolic velocity), and early postoperative clinical outcomes following cardiac surgery in neonates and infants. Thirty-seven patients undergoing surgery for congenital heart defects with an age of less than 3 months, all of whom were in the high-risk group according to Aristotle Basic Complexity risk stratification score, were enrolled in our study...
January 2015: Artificial Organs
Todd Woodard, Sigurdur Sigurdsson, John D Gotal, Alyssa A Torjesen, Lesley A Inker, Thor Aspelund, Gudny Eiriksdottir, Vilmundur Gudnason, Tamara B Harris, Lenore J Launer, Andrew S Levey, Gary F Mitchell
Aortic stiffening, assessed by carotid-femoral pulse wave velocity, is associated with CKD. Transmission of excessive flow pulsatility into the low-impedance renal microvasculature may mediate this association. However, direct analyses of macrovascular-microvascular relations in the kidney are limited. Using arterial tonometry, iohexol clearance, and magnetic resonance imaging, we related arterial stiffness, GFR, urinary albumin excretion, and potential mediators, including renal artery pulsatility index, renal vascular resistance, and arterial volume in the cortex, in 367 older adults (ages 72-92 years) participating in the Age, Gene/Environment Susceptibility-Reykjavik Study...
May 2015: Journal of the American Society of Nephrology: JASN
Gérard M London, Sylvain J Marchais, Alain P Guérin, Marie-Christine de Vernejoul
An association between atherosclerosis and osteoporosis has been reported in several studies. This association could result from local intraosseous atherosclerosis and ischemia, which is shown by limb osteoporosis in patients with peripheral artery disease (PAD), but also could result from bidirectional communication between the skeleton and blood vessels. Systemic bone disorders and PAD are frequent in ESRD. Here, we investigated the possible interaction of these disorders. For 65 prevalent nondiabetic patients on hemodialysis, we measured ankle-brachial pressure index (ABix) and evaluated mineral and bone disorders with bone histomorphometry...
February 2015: Journal of the American Society of Nephrology: JASN
Nana Meng, Jing Liu, Yue Zhang, Jinlan Ma, Hao Li, Yi Qu
OBJECTIVES: To analyze hemodynamic changes in retrobulbar blood vessels using color Doppler imaging in diabetic patients without or with retinopathy. METHODS: Pertinent publications were retrieved from 3 databases. Changes in peak systolic velocity (PSV), end-diastolic velocity (EDV), and resistive index (RI) of the ophthalmic artery, central retinal artery, and short posterior ciliary artery of diabetic eyes without or with retinopathy and healthy controls were evaluated by color Doppler imaging...
August 2014: Journal of Ultrasound in Medicine: Official Journal of the American Institute of Ultrasound in Medicine
Katsuhiko Kohara, Masayuki Ochi, Yoko Okada, Taiji Yamashita, Maya Ohara, Takeaki Kato, Tokihisa Nagai, Yasuharu Tabara, Michiya Igase, Tetsuro Miki
OBJECTIVE: The relationship between plasma levels of adiponectin and cardiovascular events is inconclusive. We evaluated the clinical characteristics of people with high plasma adiponectin and high plasma leptin levels. METHODS: Thousand seven hundred participants recruited from visitors to the Anti-Aging Doc were divided into four groups by combining the bipartiles of plasma adiponectin and leptin levels in men and women separately: AL, high adiponectin and high leptin; Al, high adiponectin and low leptin; al, low adiponectin and low leptin; aL, low adiponectin and high leptin...
August 2014: Atherosclerosis
D Schnell, M Reynaud, M Venot, A L Le Maho, M Dinic, M Baulieu, G Ducos, J Terreaux, F Zeni, E Azoulay, F Meziani, J Duranteau, M Darmon
BACKGROUND: Doppler-based renal resistive index (RI) calculation may help in the early detection of acute kidney injury (AKI). Its feasibility and reproducibility by inexperienced operators remain unknown. The main objective of this study was to compare performances of junior and senior operators in assessing renal perfusion using both the semiquantitative color-Doppler scale and RI calculation. METHODS: Prospective cohort study performed in 3 ICUs. Inexperienced juniors physicians attended a half-day course on renal perfusion assessment using RI calculation and color-Doppler (from 0, absence of renal perfusion; to 3, renal vessels identifiable in the entire field of view)...
December 2014: Minerva Anestesiologica
Jordi Calabia, Pere Torguet, Isabel Garcia, Nadia Martin, Gerard Mate, Adriana Marin, Carolina Molina, Marti Valles
The renal resistive index (RRI) measured by Doppler sonography is a marker of microvascular status that can be generalized to the whole of the arterial tree. Its association with large-vessel dysfunction, such as arterial stiffness or the atherosclerotic burden, can help to establish physiopathological associations between macrocirculation and microcirculation. The authors conducted a cross-sectional study of hypertensive patients (n=202) and a healthy control group (n=16). Stiffness parameters, atherosclerotic burden, and determination of the RRI in both kidneys were performed...
March 2014: Journal of Clinical Hypertension
Abhilash P Chandra, Conor D Marron, Phillip Puckridge, James I Spark
Percutaneous renal sympathetic denervation is an evolving therapy for resistant hypertension. Evidence to date demonstrates a reduction of blood pressure in the short term to medium term. Reported complications relate to problems with vascular access vessels and dissection of the renal artery. Renal artery stenosis has not been described in the literature. We present a patient with hypertensive crisis, flash pulmonary edema, and deterioration of renal function, secondary to bilateral renal artery stenosis, 9 months after renal sympathetic radiofrequency ablation denervation...
July 2015: Journal of Vascular Surgery
A P Rebrov, I Z Gaĭdukova, D A Patrikeeva
The aim of this work was to study the incidence of chronic renal disease (CRD) in 100 patients with systemic scleroderma (SS) who underwent general clinical and laboratory examination; glomerular filtration rate (GFR) was calculated. Statistica 8.0 and Excel 2007 programs were used to treat the results. 88% of the patients with SS had CRD, 80% showed lowered GFR and 81% suffered hypostenuria and/or proteinuria. GFR correlated with the presence of cardiac lesions and pulmonary hypertension, Valentini activity index, renal vessel resistance, concomitant renal pathology, arterial hypertension and/or CHD...
2013: Klinicheskaia Meditsina
Francesco Stea, Melania Sgrò, Francesco Faita, Rosa M Bruno, Giulia Cartoni, Sabina Armenia, Stefano Taddei, Lorenzo Ghiadoni
OBJECTIVE: Arterial stiffening has harmful effects; peripheral pulse wave reflections deleteriously increase central pressure, but on the contrary they could also possibly be protective, as the pulse is transmitted to the microcirculation to a lesser extent. The aim of this study was, therefore, to explore the relationship between wave reflection and small vessel damage in the kidney. METHODS: In 216 hypertensive patients, data on renal resistive index, obtained by Doppler ultrasound sampling of the interlobar arteries, as well as augmentation index (AIx) and carotid-to-femoral pulse wave velocity (PWV), were retrospectively analyzed...
December 2013: Journal of Hypertension
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