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AKI Ecography

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14 papers 0 to 25 followers
By Isabel Acosta-Ochoa Nephrology senior staff. Valladolid. Spain
https://www.readbyqxmd.com/read/28319118/functional-mri-for-characterization-of-renal-perfusion-impairment-and-edema-formation-due-to-acute-kidney-injury-in-different-mouse-strains
#1
Susanne Tewes, Faikah Gueler, Rongjun Chen, Marcel Gutberlet, Mi-Sun Jang, Martin Meier, Michael Mengel, Dagmar Hartung, Frank Wacker, Song Rong, Katja Hueper
PURPOSE: The purpose was to characterize acute kidney injury (AKI) in C57BL/6 (B6)- and 129/Sv (Sv)-mice by noninvasive measurement of renal perfusion and tissue edema using functional MRI. METHODS: Different severities of AKI were induced in B6- and Sv-mice by renal ischemia reperfusion injury (IRI). Unilateral clamping of the renal pedicle for 35 min (moderate AKI) or 45 min (severe AKI) was done. MRI (7-Tesla) was performed 1, 7 and 28 days after surgery using a flow alternating inversion recovery (FAIR) arterial spin labeling (ASL) sequence...
2017: PloS One
https://www.readbyqxmd.com/read/28181335/diagnostic-value-of-renal-perfusion-in-patients-with-chronic-kidney-disease-using-3d-arterial-spin-labeling
#2
Yu-Zhe Cai, Zhi-Cheng Li, Pan-Li Zuo, Josef Pfeuffer, Yu-Ming Li, Fang Liu, Rong-Bo Liu
PURPOSE: To evaluate the diagnostic value of 3D arterial spin labeling (ASL) for noninvasive quantification of renal blood flow (RBF) in patients with chronic kidney disease (CKD). MATERIALS AND METHODS: CKD patients (n = 27) and healthy volunteers (n = 36) underwent renal 3T ASL magnetic resonance imaging, with inversion times from 1200 to 2000 msec for volunteers in the preliminary test, and 1800 to 2000 msec for volunteers and CKD patients in the formal experiments...
February 9, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28144402/impact-of-contrast-enhanced-ultrasound-in-patients-with-renal-function-impairment
#3
Rossano Girometti, Tiziano Stocca, Elena Serena, Antonio Granata, Michele Bertolotto
AIM: To investigate the role of contrast enhanced ultrasound (CEUS) in evaluating patients with renal function impairment (RFI) showing: (1) acute renal failure (ARF) of suspicious vascular origin; or (2) suspicious renal lesions. METHODS: We retrospectively evaluated patients addressed to CEUS over an eight years period to rule-out vascular causes of ARF (first group of 50 subjects) or assess previously found suspicious renal lesions (second group of 41 subjects with acute or chronic RFI)...
January 28, 2017: World Journal of Radiology
https://www.readbyqxmd.com/read/27965714/doppler-ultrasound-in-kidney-diseases-a-key-parameter-in-clinical-long-term-follow-up
#4
REVIEW
Leonardo Spatola, Simeone Andrulli
Doppler ultrasound has been extensively used in detecting reno-vascular diseases, showing to be a non-invasive, safe, low cost and repeatable tool. The Renal Resistive Index (RRI) [(peak systolic velocity - end diastolic velocity)/peak systolic velocity] is a semi-quantitative index derived by Doppler evaluation of renal vascular bed. Normally RRI is in the range of 0.47-0.70, it increases with aging and, usually, it shows a difference between the two kidneys less than 5-8 %. RRI is an important prognostic marker in chronic kidney diseases (CKD), both in diabetic and non-diabetic kidney diseases, because, in longitudinal prospective studies, it significantly correlated with hemodynamic (ABPM, SBP, DBP, pulse pressure) and histopathological parameters (glomerular sclerosis, arteriolosclerosis, interstitial fibrosis/tubular atrophy, interstitial infiltration)...
December 2016: Journal of Ultrasound
https://www.readbyqxmd.com/read/27169556/ultrasound-in-acute-kidney-disease
#5
Mario Meola, Federico Nalesso, Ilaria Petrucci, Sara Samoni, Claudio Ronco
Kidneys' imaging provides useful information in acute kidney injury (AKI) diagnosis and management. Today, several imaging techniques give information on kidneys anatomy, urinary obstruction, differential diagnosis between AKI and chronic kidney disease (CKD), renal blood flow and glomerular filtration rate. Ultrasound is a safe, non-invasive and repeatable imaging technique so it is widely used in the first level work-up of AKI. The utility of contrast-enhanced computed tomography and magnetic resonance imaging in AKI or in AKI during CKD is limited because of renal toxicity associated with contrast agents used...
2016: Contributions to Nephrology
https://www.readbyqxmd.com/read/27169621/clinical-scenarios-in-acute-kidney-injury-pre-renal-acute-kidney-injury
#6
Mario Meola, Federico Nalesso, Ilaria Petrucci, Sara Samoni, Claudio Ronco
Approximately 70% of community-acquired cases of acute kidney injury are attributed to pre-renal causes. In most of these cases, the underlying kidney function may be normal, but decreased renal perfusion associated with low intravascular volume or decreased arterial pressure can determine a reduced glomerular filtration rate (GFR). Autoregulatory mechanisms can partially compensate renal perfusion reduction in order to maintain GFR. In patients with pre-existing chronic kidney disease, however, these mechanisms are impaired, and the susceptibility to develop acute-on-chronic renal failure is higher...
2016: Contributions to Nephrology
https://www.readbyqxmd.com/read/27170038/clinical-scenarios-in-acute-kidney-injury-parenchymal-acute-kidney-injury-vascular-diseases
#7
Mario Meola, Sara Samoni, Ilaria Petrucci, Claudio Ronco
Acute cortical necrosis and hemolytic uremic syndrome (HUS) are 2 clinical scenarios of parenchymal acute kidney injury (AKI) related to renal microvascular injury. Acute cortical necrosis is a rare condition related to an ischemic necrosis of renal cortex. Necrotic lesions can be due to several injuries and may be focal, multifocal or diffuse. Renal necrotic lesions become visible with ultrasound only after renal recovery. HUS is a rare disease characterized by hemolytic anemia, thrombocytopenia and AKI. Color Doppler ultrasound is useful during diagnostic and follow-up phase...
2016: Contributions to Nephrology
https://www.readbyqxmd.com/read/27169885/clinical-scenarios-in-acute-kidney-injury-parenchymal-acute-kidney-injury-tubulo-interstitial-diseases
#8
Mario Meola, Sara Samoni, Ilaria Petrucci, Claudio Ronco
Acute tubular necrosis (ATN) is the most common type of acute kidney injury (AKI) related to parenchymal damage (90% of cases). It may be due to a direct kidney injury, such as sepsis, drugs, toxins, contrast media, hemoglobinuria and myoglobinuria, or it may be the consequence of a prolonged systemic ischemic injury. Conventional ultrasound (US) shows enlarged kidneys with hypoechoic pyramids. Increased volume is largely sustained by the increase of anteroposterior diameter, while longitudinal axis usually maintains its normal length...
2016: Contributions to Nephrology
https://www.readbyqxmd.com/read/27170168/clinical-scenarios-in-acute-kidney-injury-post-renal-acute-kidney-injury
#9
Mario Meola, Sara Samoni, Ilaria Petrucci, Claudio Ronco
The incidence of acute kidney injury related to urinary tract obstruction is low (1-10%). It occurs in bilateral renal or lower urinary tract obstruction or in ureter obstruction in patients with a single functioning kidney or with pre-existing chronic kidney disease. The etiology and the incidence of obstruction vary on the basis of age and gender. Conventional ultrasound has a high sensitivity (>95%), but low specificity (<70%) in the diagnosis of urinary tract obstruction. Nevertheless, color Doppler is used through the evaluation of renal resistive indexes, ureteral jet and twinkling artifact...
2016: Contributions to Nephrology
https://www.readbyqxmd.com/read/27887768/evaluation-of-acute-kidney-injury-using-contrast-ultrasonography-in-a-rabbit-model-of-crush-syndrome
#10
Chundong Zhang, Xin Wang, Jie Tang
This study aimed to investigate the feasibility of evaluating acute kidney injury (AKI) using contrast ultrasonography in a rabbit model of crush syndrome. Sixty-four New Zealand white rabbits were anesthetized and the left hind limb was wrapped and compressed for 4 h with a sphygmomanometer. Contrast ultrasonography of the left kidney using microbubbles as the contrast medium was performed. The serum levels of blood urea nitrogen (BUN), creatine (Cr), creatine kinase (CK) and lactate dehydrogenase (LDH) were significantly increased in comparison to before the compression...
February 2017: Ultrasound in Medicine & Biology
https://www.readbyqxmd.com/read/27193438/influence-of-volume-administration-on-doppler-based-renal-resistive-index-renal-hemodynamics-and-renal-function-in-medical-intensive-care-unit-patients-with-septic-induced-acute-kidney-injury-a-pilot-study
#11
Tobias Lahmer, Sebastian Rasch, Christopher Schnappauf, Roland M Schmid, Wolfgang Huber
PURPOSE: Impact of volume challenge (VC) on renal hemodynamics and renal function in patients with septic-induced acute kidney injury in addition to transpulmonary thermodilution (TPTD)-derived hemodynamic parameters. METHODS: Systemic hemodynamic parameters derived from TPTD, Doppler-based resistive index (RI) urine output, creatinine and urea levels were obtained before, after and 24 h after VC. RESULTS: Heart rate (p < 0.045), systolic blood pressure (p < 0...
August 2016: International Urology and Nephrology
https://www.readbyqxmd.com/read/27186959/external-validation-of-risk-stratification-strategy-in-the-use-of-renal-ultrasonography-in-the-evaluation-of-acute-kidney-injury
#12
Ivan K Ip, Patricia C Silveira, Emily C Alper, Carol B Benson, Ramin Khorasani
BACKGROUND: Per the American College of Radiology Appropriateness Criteria, renal ultrasound is the most appropriate imaging examination to evaluate patients with acute kidney injury. However, recent studies suggest that renal ultrasound may be more selectively performed, which could lead to reductions in the use of medical imaging. OBJECTIVE: Evaluate a published risk stratification prediction model (the Licurse model) for using renal ultrasound in hospitalized patients with acute kidney injury...
May 17, 2016: Journal of Hospital Medicine: An Official Publication of the Society of Hospital Medicine
https://www.readbyqxmd.com/read/26925411/functional-magnetic-resonance-imaging-in-acute-kidney-injury-present-status
#13
REVIEW
Hai Ying Zhou, Tian Wu Chen, Xiao Ming Zhang
Acute kidney injury (AKI) is a common complication of hospitalization that is characterized by a sudden loss of renal excretory function and associated with the subsequent development of chronic kidney disease, poor prognosis, and increased mortality. Although the pathophysiology of renal functional impairment in the setting of AKI remains poorly understood, previous studies have identified changes in renal hemodynamics, perfusion, and oxygenation as key factors in the development and progression of AKI. The early assessment of these changes remains a challenge...
2016: BioMed Research International
https://www.readbyqxmd.com/read/26728776/renal-resistive-index-and-mortality-in-critical-patients-with-acute-kidney-injury
#14
Maria Boddi, Manuela Bonizzoli, Marco Chiostri, Dario Begliomini, Adele Molinaro, Laura Tadini Buoninsegni, Gian Franco Gensini, Adriano Peris
BACKGROUND: The predictive role of Doppler Renal Resistive Index (RRI) for mortality was shown in chronic kidney disease. In selected populations of intensive care unit (ICU), RRI predicts acute kidney injury (AKI) occurrence and anticipates persistent AKI. No data are available about mortality. We investigated whether RRI assay at AKI diagnosis could predict AKI mortality in a 10-bed-mixed medical-surgical and trauma ICU of a tertiary referral teaching hospital. The association between RRI and persistent AKI at discharge was investigated...
March 2016: European Journal of Clinical Investigation
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