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https://www.readbyqxmd.com/read/28228405/inhibition-of-romk-blocks-macula-densa-tubuloglomerular-feedback-yet-causes-renal-vasoconstriction-in-anesthetized-rats
#1
Magali Araujo, William J Welch, Xiaoyan Zhou, Kathleen Sullivan, Shawn Walsh, Alexander Pasternak, Christopher S Wilcox
The Na+/K+/2Cl- cotransporter (NKCC2) on the loop of Henle is the site of action of furosemide. Since outer medullary potassium channel (ROMK) inhibitors prevent reabsorption by NKCC2, we tested the hypothesis that ROMK inhibition with a novel, selective ROMK inhibitor (Compound C) blocks tubuloglomerular feedback (TGF) and reduces vascular resistance. Loop perfusion of either ROMK inhibitor or furosemide caused dose-dependent blunting of TGF, but the response to furosemide was 10-fold more sensitive (IC50= 10-6M for furosemide and IC50=10-5M for Compound C)...
February 22, 2017: American Journal of Physiology. Renal Physiology
https://www.readbyqxmd.com/read/28228404/endothelial-colony-forming-cells-ameliorate-endothelial-dysfunction-via-secreted-factors-following-ischemia-reperfusion-injury
#2
Jason A Collett, Purvi Mehrotra, Allison Crone, W Christopher Shelley, Mervin C Yoder, David P Basile
Damage to endothelial cells contributes to acute kidney injury (AKI) by leading to impaired perfusion. Endothelial colony-forming cells (ECFCs) are endothelial precursor cells with high proliferative capacity, pro-angiogenic activity, and in vivo vessel forming potential. We hypothesized that ECFCs may ameliorate the degree of AKI and/or promote repair of the renal vasculature following ischemia/reperfusion (I/R). Rat pulmonary microvascular ECs (PMVEC) with high proliferative potential were compared with pulmonary artery ECs (PAEC) with low proliferative potential in rats subjected to renal I/R...
February 22, 2017: American Journal of Physiology. Renal Physiology
https://www.readbyqxmd.com/read/28222985/concurrent-renal-artery-stent-during-endovascular-infrarenal-aortic-aneurysm-repair-confers-higher-risk-for-30-day-acute-renal-failure
#3
Besma Nejim, Isibor Arhuidese, Muhammmad Rizwan, Lana Khalil, Satinderjit Locham, Devin Zarkowsky, Philip Goodney, Mahmoud B Malas
OBJECTIVE: Concurrent renal artery angioplasty and stenting (RAAS) during endovascular aneurysm repair (EVAR) of infrarenal abdominal aortic aneurysm (AAA) has been practiced in an attempt to maintain renal perfusion. The aim of this study was to identify the current practice of RAAS during EVAR and its effect on perioperative renal outcome. METHODS: Patients with infrarenal AAA were identified from the American College of Surgeons National Surgical Quality Improvement Program (ACS NSQIP, 2011-2014) database...
February 17, 2017: Journal of Vascular Surgery
https://www.readbyqxmd.com/read/28213004/pharmacokinetic-evaluation-of-intrapleural-perfusion-with-hyperthermic-chemotherapy-using-cisplatin-in-patients-with-malignant-pleural-effusion
#4
Hirozo Sakaguchi, H Ishida, H Nitanda, N Yamazaki, K Kaneko, Kunihiko Kobayashi
OBJECTIVES: Malignant pleural effusion (MPE) has a poor prognosis. Most patients are treated with tube thoracostomy and sclerotherapy, although its success rate is around 64%. We have investigated intrapleural perfusion with hyperthermic chemotherapy (IPHC) using cisplatin in a study with a pharmacokinetic evaluation. METHODS: Patients with MPE, performance status of 0-1, possibility of good lung expansion and Cr<1.2mg/dL were treated with IPHC. The circuit was filled with 2000mL of normal saline containing cisplatin at a dose of 80mg/m(2)...
February 2017: Lung Cancer: Journal of the International Association for the Study of Lung Cancer
https://www.readbyqxmd.com/read/28208200/massive-pulmonary-embolism-extracorporeal-membrane-oxygenation-and-surgical-pulmonary-embolectomy
#5
Aaron Weinberg, Victor F Tapson, Danny Ramzy
Massive pulmonary embolism (PE) refers to large emboli that cause hemodynamic instability, right ventricular failure, and circulatory collapse. According to the 2016 ACCP Antithrombotic Guidelines, therapy for massive PE should include systemic thrombolytic therapy in conjunction with anticoagulation and supportive care. However, in patients with a contraindication to systemic thrombolytics or in those who fail the above interventions, extracorporeal membrane oxygenation (ECMO) and/or surgical embolectomy may be used to improve oxygenation, achieve hemodynamic stability, and successfully treat massive PE...
February 2017: Seminars in Respiratory and Critical Care Medicine
https://www.readbyqxmd.com/read/28203538/robotic-mitral-valve-repair-for-degenerative-posterior-leaflet-prolapse
#6
Hoda Javadikasgari, Rakesh M Suri, Bassman Tappuni, Ashley M Lowry, Tomislav Mihaljevic, Stephanie Mick, A Marc Gillinov
BACKGROUND: Robotic mitral valve (MV) repair is the least invasive surgical approach to the MV and provides unparalleled access to the valve. We sought to assess technical aspects and clinical outcomes of robotic MV repair for isolated posterior leaflet prolapse by examining the first 623 such cases performed in a tertiary care center. METHODS: We reviewed the first 623 patients (mean age 56±9.7 years) with isolated posterior leaflet prolapse who underwent robotic primary MV repair from 01/2006 to 11/2013...
January 2017: Annals of Cardiothoracic Surgery
https://www.readbyqxmd.com/read/28202885/tolvaptan-reduces-the-risk-of-worsening-renal-function-in-patients-with-acute-decompensated-heart-failure-and-preserved-left-ventricular-ejection-fraction%C3%A3-prospective-randomized-controlled-study
#7
Shunsuke Tamaki, Yoshihiro Sato, Takahisa Yamada, Takashi Morita, Yoshio Furukawa, Yusuke Iwasaki, Masato Kawasaki, Atsushi Kikuchi, Takumi Kondo, Tatsuhisa Ozaki, Masahiro Seo, Iyo Ikeda, Eiji Fukuhara, Makoto Abe, Jun Nakamura, Masatake Fukunami
BACKGROUND: Although the mainstay of treatment for acute decompensated heart failure (ADHF) is decongestion by diuretic therapy, it is often associated with worsening renal function (WRF). The effect of tolvaptan, a selective V2 receptor antagonist, on WRF in ADHF patients with preserved left ventricular ejection fraction (LVEF) is unknown.Methods and Results:We enrolled 50 consecutive ADHF patients whose LVEF on admission was ≥45%. Patients were randomly assigned to either tolvaptan add-on (n=26) or conventional diuretic therapy (n=24)...
February 16, 2017: Circulation Journal: Official Journal of the Japanese Circulation Society
https://www.readbyqxmd.com/read/28202440/exposure-to-placental-ischemia-impairs-postpartum-maternal-renal-and-cardiac-function-in-rats
#8
Nina D Paauw, Jaap A Joles, Frank T Spradley, Bhavisha Bakrania, Zsuzsanna K Zellenger, Arie Franx, Marianne C Verhaar, Joey P Granger, A Titia Lely
INTRODUCTION: Women with a history of preeclampsia (PE) have an increased risk to develop cardiovascular and renal diseases later in life, but the mechanisms underlying this effect are unknown. In rats, we assessed whether placental ischemia results in long-term effects on the maternal cardiovascular and renal systems using the Reduced Uterine Perfusion Pressure (RUPP) model for PE. METHODS: Sprague-Dawley rats received either a SHAM or RUPP operation at gestational day 14...
February 15, 2017: American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
https://www.readbyqxmd.com/read/28193784/impaired-myogenic-response-of-the-afferent-arteriole-contributes-to-the-increased-susceptibility-to-renal-disease-in-milan-normotensive-rats
#9
Ying Ge, Fan Fan, Sean P Didion, Richard J Roman
Milan normotensive (MNS) rats are more susceptible to the development of renal disease than Milan hypertensive (MHS) rats, but the genes and pathways involved are unknown. This study compared the myogenic response of isolated perfused afferent arterioles (Af-Art) and autoregulation of renal blood flow (RBF) and glomerular capillary pressure (Pgc) in 6-9-week-old MNS and MHS rats. The diameter of the Af-Art of MHS rats decreased significantly from 14.3 ± 0.5 to 11.5 ± 0.6 μm when perfusion pressure was elevated from 60 to 120 mmHg...
February 2017: Physiological Reports
https://www.readbyqxmd.com/read/28191530/contrast-enhanced-ultrasound-a-promising-method-for-renal-microvascular-perfusion-evaluation
#10
REVIEW
Ling Wang, Chandra Mohan
This article reviews the application of contrast-enhanced ultrasound (CEUS) in gauging renal microvascular perfusion in diverse renal diseases. The unique nature of the contrast agents used in CEUS provides real-time and quantitative imaging of the vasculature. In addition to the traditional use of CEUS for evaluation of kidney masses, it also emerges as a safe and effective imaging approach to assess microvascular perfusion in diffuse renal lesions, non-invasively. Although the precise CEUS parameters that may best predict disease still warrant systematic evaluation, animal models and limited clinical trials in humans raise hopes that CEUS could outcompete competing modalities as a first-line tool for assessing renal perfusion non-invasively, even in ailments such as acute kidney injury and chronic kidney disease...
September 1, 2016: Journal of Translational Internal Medicine
https://www.readbyqxmd.com/read/28190602/prevention-of-acute-kidney-injury-in-intensive-care-units
#11
S Mas-Font, J Ros-Martinez, C Pérez-Calvo, P Villa-Díaz, S Aldunate-Calvo, E Moreno-Clari
Acute kidney injury (AKI) is a growing concern in Intensive Care Units. The advanced age of our patients, with the increase in associated morbidity and the complexity of the treatments provided favor the development of AKI. Since no effective treatment for AKI is available, all efforts are aimed at prevention and early detection of the disorder in order to establish secondary preventive measures to impede AKI progression. In critical patients, the most frequent causes are sepsis and situations that result in renal hypoperfusion; preventive measures are therefore directed at securing hydration and correct hemodynamics through fluid perfusion and the use of inotropic or vasoactive drugs, according to the underlying disease condition...
February 9, 2017: Medicina Intensiva
https://www.readbyqxmd.com/read/28190559/use-of-renal-near-infrared-spectroscopy-measurements-in-congenital-diaphragmatic-hernia-patients-on-ecmo
#12
Patricio E Lau, Stephanie Cruz, Joseph Garcia-Prats, Milenka Cuevas, Christopher Rhee, Darrell L Cass, Sarah E Horne, Timothy C Lee, Stephen E Welty, Oluyinka O Olutoye
INTRODUCTION: This study tests the hypothesis that renal tissue oxygen saturation as measured by Near Infrared Spectroscopy (NIRS) would correlate with urine output in neonates with congenital diaphragmatic hernia (CDH) on extracorporeal membrane oxygenation (ECMO). METHODS: Between 2012 and 2015, neonates with CDH were enrolled as part of a comprehensive study that provided renal/cerebral/abdominal NIRS monitoring for the duration of ECMO support. Continuous NIRS measurements, mean arterial pressure, and urine output were recorded...
January 27, 2017: Journal of Pediatric Surgery
https://www.readbyqxmd.com/read/28187752/targeting-urine-output-and-30-day-mortality-in-goal-directed-therapy-a-systematic-review-with-meta-analysis-and-meta-regression
#13
Esther N van der Zee, Mohamud Egal, Diederik Gommers, A B Johan Groeneveld
BACKGROUND: Oliguria is associated with a decreased kidney- and organ perfusion, leading to organ damage and increased mortality. While the effects of correcting oliguria on renal outcome have been investigated frequently, whether urine output is a modifiable risk factor for mortality or simply an epiphenomenon remains unclear. We investigated whether targeting urine output, defined as achieving and maintaining urine output above a predefined threshold, in hemodynamic management protocols affects 30-day mortality in perioperative and critical care...
February 10, 2017: BMC Anesthesiology
https://www.readbyqxmd.com/read/28182709/320-row-ct-renal-perfusion-imaging-in-patients-with-aortic-dissection-a-preliminary-study
#14
Dongting Liu, Jiayi Liu, Zhaoying Wen, Yu Li, Zhonghua Sun, Qin Xu, Zhanming Fan
OBJECTIVE: To investigate the clinical value of renal perfusion imaging in patients with aortic dissection (AD) using 320-row computed tomography (CT), and to determine the relationship between renal CT perfusion imaging and various factors of aortic dissection. METHODS: Forty-three patients with AD who underwent 320-row CT renal perfusion before operation were prospectively enrolled in this study. Diagnosis of AD was confirmed by transthoracic echocardiography...
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
#15
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/28178160/extracorporeal-membrane-oxygenation-support-in-post-traumatic-cardiopulmonary-failure-a-10-year-single-institutional-experience
#16
Chun-Yu Lin, Feng-Chun Tsai, Hsiu-An Lee, Yuan-His Tseng
Patients with multiple traumas associated with cardiopulmonary failure have a high mortality rate; however, such patients can be temporarily stabilized using extracorporeal membrane oxygenation (ECMO), providing a bridge to rescue therapy. Using a retrospective study design, we aimed to clarify the prognostic factors of post-traumatic ECMO support.From March 2006 to July 2016, 43 adult patients (mean age, 37.3 ± 15.2 years; 7 females [16.3%]) underwent ECMO because of post-traumatic cardiopulmonary failure...
February 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28176336/effect-of-hypothermic-machine-perfusion-on-the-preservation-of-kidneys-donated-after-cardiac-death-a-single-center-randomized-controlled-trial
#17
Wei Wang, Dawei Xie, Xiaopeng Hu, Hang Yin, Hang Liu, Xiaodong Zhang
To assess the application of a hypothermic machine perfusion device (LifePort) in kidney transplantation from donation after cardiac death (DCD) donors, 24 pairs of DCD kidneys were randomly divided into two groups: one of the paired kidneys from the same donor was perfused with the LifePort machine (hypothermic machine perfusion [HMP]), and the contralateral kidney was prepared using common static cold preservation (CCP). The two groups were compared with respect to the incidence of delayed graft function (DGF), level of graft function, and pathological changes in time-zero biopsy specimens...
February 8, 2017: Artificial Organs
https://www.readbyqxmd.com/read/28168868/oesophageal-doppler-guided-optimization-of-cardiac-output-does-not-increase-visceral-microvascular-blood-flow-in-healthy-volunteers
#18
Thomas P Heinink, David J Read, William K Mitchell, Ashish Bhalla, Jonathan N Lund, Bethan E Phillips, John P Williams
BACKGROUND: Oesophageal Doppler monitoring (ODM) is used clinically to optimize cardiac output (CO) and guide fluid therapy. Despite limited experimental evidence, it is assumed that increasing CO increases visceral microvascular blood flow (MBF). We used contrast-enhanced ultrasound (CEUS) to assess whether ODM-guided optimization of CO altered MBF. METHODS: Sixteen healthy male volunteers (62 ± 3·4 years) were studied. Baseline measurements of CO were recorded via ODM...
February 6, 2017: Clinical Physiology and Functional Imaging
https://www.readbyqxmd.com/read/28158274/alterations-of-erythrocyte-rheology-and-cellular-susceptibility-in-end-stage-renal-disease-effects-of-peritoneal-dialysis
#19
Nesrin Zeynep Ertan, Semra Bozfakioglu, Elif Ugurel, Mukaddes Sinan, Ozlem Yalcin
In this study, we investigated the effects of peritoneal dialysis on hemorheological and hematological parameters and their relations with oxidant and antioxidant status of uremic patients. Hemorheological parameters (erythrocyte deformability, erythrocyte aggregation, osmotic deformability, blood and plasma viscosity) were measured in patients with renal insufficiency undergoing peritoneal dialysis (PD) and volunteers. Erythrocyte deformability, osmotic deformability and aggregation in both autologous plasma and 3% dextran 70 were measured by laser diffraction ektacytometry...
2017: PloS One
https://www.readbyqxmd.com/read/28148531/primary-proximal-tubule-hyperreabsorption-and-impaired-tubular-transport-counterregulation-determine-glomerular-hyperfiltration-in-diabetes-a-modeling-analysis
#20
Karen Melissa Hallow, Yeshitila Gebremichael, Gabriel Helmlinger, Volker Vallon
Glomerular hypertension and hyperfiltration in early diabetes is associated with development and progression of diabetic kidney disease. The tubular hypothesis of diabetic hyperfiltration proposes that it is initiated by a primary increase in sodium (Na) reabsorption in the proximal tubule (PT) and the resulting tubuloglomerular feedback (TGF) response and lowering of Bowman space pressure (PBow). Here we utilized a mathematical model of the human kidney to investigate over acute and chronic timescales the mechanisms responsible for the magnitude of the hyperfiltration response...
February 1, 2017: American Journal of Physiology. Renal Physiology
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