Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 7 de 7
Filtrar
Mais filtros










Base de dados
Intervalo de ano de publicação
2.
Can J Kidney Health Dis ; 10: 20543581231177218, 2023.
Artigo em Inglês | MEDLINE | ID: mdl-37313361

RESUMO

Background: Percutaneous kidney biopsies are essential for diagnosis and management of kidney diseases. However, post-procedural bleeding is a significant risk associated with biopsies. At the McGill University Health Center, the 2 main hospitals, the Royal Victoria Hospital and the Montreal General Hospital, have different observation protocols for outpatient native kidney biopsies. Currently, patients are admitted for a 24-hour inpatient observation at the Montreal General Hospital, whereas patients biopsied at the Royal Victoria Hospital are discharged after 6 to 8 hours of observation at the end of the day. Most Canadian centers do not admit patients for an overnight observation, and it was unclear why this practice continued at the Montreal General Hospital. Objective: Our objective was to determine the incidence of complications post-renal biopsy over the past 5 years at both hospital sites, and compare them to each other, as well as to established rates in the available literature. Design: This assessment was designed as a quality assurance audit. Setting: This audit was conducted from a local registry of renal biopsies performed at the McGill University Health Center between January 2015 to January 2020. Patients: We included all adult patients (between the ages 18 and 80) with outpatient native kidney biopsies performed at the McGill University Health Center between 2015 and 2020. Measurements: We collected the included patients' baseline demographics and risk factors at the time of biopsy, including age, BMI, creatinine, estimated glomerular filtration rate, pre- and post-biopsy hemoglobin, platelet, urea, coagulation profile, blood pressure, kidney side/size as well as needle size, and number of passes made. Methods: We compared the incidence of both minor and major bleeding complications at the Montreal General and the Royal Victoria Hospital. Variables that were measured included hemoglobin before and after biopsy, incidence of minor bleeding complications (defined by hematomas and gross hematuria), and incidence of major complications (defined by post-biopsy bleeding requiring either transfusions or another procedure to stop the bleeding), as well as the incidence of admissions post-biopsy. Results: The incidence of major complications was 2.87% over 5 years (5/174 patients), which is comparable with that reported in the literature. Our transfusion incidence was 1.72% (3/174 patients) and our embolization incidence was 2.3% (4/174 patients) over the 5 study years. Our total number of major events was low and the patients who had major events had significant risk factors for bleeding. All events occurred within 6 hours of observation. Limitations: This was a retrospective study with a low event number. Additionally, since the events included only those recorded at the McGill University Health Center, it is possible that the events of interest may have occurred at other hospital sites without the author's knowledge. Conclusions: Based on the results of this audit, all major bleeding events occurred within 6 hours of a percutaneous kidney biopsy, suggesting that patients should be monitored for 6 to 8 hours following biopsy. The next step after this quality assurance audit is a quality improvement project and a cost-effectiveness analysis to assess whether post-biopsy practices should be amended at the McGill University Health Center.


Contexte: Les biopsies rénales percutanées sont essentielles pour diagnostiquer et prendre en charge l'insuffisance rénale, mais elles exposent le patient à un risque significatif de saignements post-procéduraux. Les deux principaux hôpitaux du Center universitaire de santé McGill, soit l'Hôpital Royal Victoria et l'Hôpital général de Montréal, suivent un protocole d'observation différent à la suite d'une biopsie rénale en consultation externe. À l'Hôpital général de Montréal, les patients sont admis 24 heures pour observation, alors qu'à l'Hôpital Royal Victoria, les patients sont libérés en fin de journée, après 6-8 heures d'observation. La plupart des centers hospitaliers canadiens n'admettent pas les patients pour la nuit; on ignore pourquoi cette pratique a toujours cours à l'Hôpital général de Montréal. Objectifs: L'objectif était de mesurer l'incidence des complications post-biopsie rénale dans chacun des deux centers hospitaliers au cours des cinq dernières années, puis de les comparer d'un hôpital à l'autre ainsi qu'aux taux établis dans la littérature. Conception: Cette étude a été conçue comme un examen de qualité de l'acte. Cadre: L'étude a été réalisée à partir d'un registre local des biopsies rénales effectuées au Center universitaire de santé McGill entre janvier 2015 et janvier 2020. Sujets: Nous avons inclus tous les patients adultes (18 à 80 ans) ayant subi une biopsie rénale en ambulatoire au Center universitaire de santé McGill entre 2015 et 2020. Mesures: Les données démographiques de base et les facteurs de risque des patients inclus ont été recueillis au moment de la biopsie, notamment l'âge, l'IMC, le taux de créatinine, le débit de filtration glomérulaire estimé, le taux d'hémoglobine avant et après la biopsie, le décompte plaquettaire, l'urée, le profil de coagulation, la pression artérielle, le côté/taille des reins, la taille de l'aiguille et le nombre de ponctions. Méthodologie: Nous avons comparé l'incidence des complications hémorragiques mineures et majeures à l'Hôpital général de Montréal et à l'Hôpital Royal Victoria. Les variables mesurées comprenaient: le taux d'hémoglobine avant et après la biopsie, l'incidence de complications hémorragiques mineures (définies par des hématomes et de l'hématurie macroscopique) et majeures (définies par des saignements post-biopsie nécessitant une transfusion ou une procédure pour arrêter le saignement), ainsi que l'incidence des admissions après la biopsie. Résultats: Pour les cinq années à l'étude, l'incidence des complications majeures était de 2.87% (5/174 patients), ce qui est comparable au taux rapporté dans la littérature. Au cours de cette même période, l'incidence des transfusions s'est établie à 1.72% (3/174 patients) et celle des embolisations à 2.3% (4/174 patients). Le nombre total d'événements majeurs était faible et les patients qui les avaient subis présentaient d'importants facteurs de risque de saignement. Tous les événements sont survenus dans les six premières heures d'observation. Limites: Il s'agit d'une étude rétrospective avec un faible nombre d'événements. En outre, seuls les événements enregistrés au Center universitaire de santé McGill ont été pris en compte; il est possible que des événements intéressants se soient produits à l'insu de l'auteur dans d'autres hôpitaux. Conclusion: Selon les résultats de cet examen, tous les événements hémorragiques majeurs se sont produits dans les 6 heures suivant une biopsie rénale percutanée, ce qui plaide en faveur d'une surveillance des patients pendant 6 à 8 heures après la biopsie. Après cet examen de qualité de l'acte, les prochaines étapes sont un projet d'amélioration de la qualité et une analyze coût-efficacité, lesquels permettront de déterminer si les pratiques post-biopsies devraient être modifiées au Center universitaire de santé McGill.

3.
Pharmacol Ther ; 242: 108330, 2023 02.
Artigo em Inglês | MEDLINE | ID: mdl-36513134

RESUMO

Diabetes drives an increasing burden of cardiovascular and renal disease worldwide, motivating the search for new hypoglycemic agents that confer cardiac and renal protective effects. Although initially developed as hypoglycemic agents, sodium-glucose co-transporter 2 (SGLT-2) inhibitors have since been studied in patients with and without diabetes for the management of heart failure and chronic kidney disease. A growing body of evidence supports the efficacy and safety of SGLT-2 inhibitors in patients with chronic kidney disease (CKD), based on complex mechanisms of action that extend far beyond glucosuria and that confer beneficial effects on cardiovascular and renal hemodynamics, fibrosis, inflammation, and end-organ protection. This review focuses on the pharmacology and pathophysiology of SGLT-2 inhibitors in patients with CKD, as well as their cardiovascular and renal effects in this population. We are focusing on the five agents that have been tested in cardiovascular outcome trials and that have been approved either in Europe or in North America: empagliflozin, dapagliflozin, canagliflozin, ertugliglozin, and sotagliflozin.


Assuntos
Diabetes Mellitus Tipo 2 , Insuficiência Renal Crônica , Inibidores do Transportador 2 de Sódio-Glicose , Simportadores , Humanos , Inibidores do Transportador 2 de Sódio-Glicose/farmacologia , Inibidores do Transportador 2 de Sódio-Glicose/uso terapêutico , Diabetes Mellitus Tipo 2/tratamento farmacológico , Hipoglicemiantes/efeitos adversos , Insuficiência Renal Crônica/tratamento farmacológico , Glucose , Sódio
4.
Can J Kidney Health Dis ; 9: 20543581221116215, 2022.
Artigo em Inglês | MEDLINE | ID: mdl-35966172

RESUMO

Climate change is one of the greatest threats to human health in the 21st century. The human health impacts of climate change contribute to approximately 1 in 4 deaths worldwide. Health care itself is responsible for approximately 5% of annual global greenhouse gas (GHG) emissions. Canada is a recent signatory of the 26th United Nations Climate Change Conference (COP26) health agreement that is committed to developing low carbon and climate resilient health systems. Kidney care services have a substantial environmental impact and there is opportunity for the kidney care community to climate align clinical care. We introduce a framework of redesigned kidney care and describe examples of low carbon kidney disease management strategies to expand our duty of care to the environment which completes the triple bottom line of optimal patient outcomes and cost effectiveness in the Anthropocene.

5.
Can J Kidney Health Dis ; 9: 20543581221089094, 2022.
Artigo em Inglês | MEDLINE | ID: mdl-35450151

RESUMO

Background: Glomerulonephritis (GN) is a leading cause of kidney failure and accounts for 20% of incident cases of end-stage kidney disease (ESKD) in Canada annually. Reversal of kidney injury and prevention of progression to kidney failure is possible; however, limited knowledge of underlying disease mechanisms and lack of noninvasive biomarkers and therapeutic targets are major barriers to successful therapeutic intervention. Multicenter approaches that link longitudinal clinical and outcomes data with serial biologic specimen collection would help bridge this gap. Objective: To establish a national, patient-centered, multidimensional web-based clinical database and federated virtual biobank to conduct human-based molecular and clinical research in GN in Canada. Design: Multicenter, prospective observational registry, starting in 2019. Setting: Nine participating Canadian tertiary care centers. Patients: Adult patients with a histopathologic pattern of injury consistent with IgA nephropathy, focal and segmental glomerulosclerosis, minimal change disease, membranous nephropathy, C3 glomerulopathy, and membranoproliferative GN recruited within 24 months of biopsy. Measurements: Initial visits include detailed clinical, histopathological, and laboratory data collection, blood, urine, and tonsil swab biospecimen collection, and a self-administered quality of life questionnaire. Follow-up clinical and laboratory data collection, biospecimen collection, and questionnaires are obtained every 6 months thereafter. Methods: Patients receive care as defined by their physician, with study visits scheduled every 6 months. Patients are followed until death, dialysis, transplantation, or withdrawal from the study. Key outcomes include a composite of ESKD or a 40% decline in estimated glomerular filtration rate (eGFR) at 2 years, rate of kidney function decline, and remission of proteinuria. Clinical and molecular phenotypical data will be analyzed by GN subtype to identify disease predictors and discover therapeutic targets. Limitations: Given the relative rarity of individual glomerular diseases, one of the major challenges is patient recruitment. Initial registry studies may be underpowered to detect small differences in clinically meaningful outcomes such as ESKD or death due to small sample sizes and short duration of follow-up in the initial 2-year phase of the study. Conclusions: The Canadian Glomerulonephritis Registry (CGNR) supports national collaborative efforts to study glomerular disease patients and their outcomes. Trial registration: NCT03460054.


Contexte: Les glomérulonéphrites (GN) sont des causes importantes d'insuffisance rénale; elles représentent 20 % des cas incidents d'insuffisance rénale terminale (IRT) au Canada chaque année. Inverser la néphropathie et prévenir la progression vers l'insuffisance rénale est possible, mais deux obstacles majeurs freinent la réussite de l'intervention thérapeutique: une compréhension limitée des mécanismes sous-jacents de la maladie, de même que l'absence de biomarqueurs non invasifs et de cibles thérapeutiques. Les approches multicentriques reliant les données cliniques longitudinales et les résultats de santé à la collecte d'échantillons biologiques en série permettraient de combler cette lacune. Objectif: Créer une base de données cliniques nationale en ligne, multidimensionnelle et axée sur le patient, de même qu'une biobanque virtuelle fédérée pour permettre de mener des recherches moléculaires et cliniques humaines sur les GN au Canada. Type d'étude: Registre d'observation prospectif multicentrique débuté en 2019. Cadre: Neuf centres de soins tertiaires canadiens. Sujets: Des patients adultes recrutés dans les 24 mois suivant la biopsie et présentant un profil histopathologique de lésion compatible avec une néphropathie à IgA, une hyalinose segmentaire et focale, une maladie à changement minime, une glomérulonéphrite extra-membraneuse, une glomérulopathie à C3 et une glomérulonéphrite membranoproliférative. Mesures: La première visite comporte une collecte détaillée des données cliniques, histopathologiques et de laboratoire, la collecte d'échantillons biologiques (sang, urine et écouvillonnage des amygdales), ainsi qu'un questionnaire autoadministré sur la qualité de vie. Pour le suivi, la collecte des données cliniques et de laboratoire, la collecte des échantillons biologiques et les questionnaires s'effectuent tous les six mois. Méthodologie: Les patients reçoivent des soins comme établi par leur médecin, et les visites d'étude sont programmées tous les six mois. Les patients sont suivis jusqu'au décès ou jusqu'à la dialyse, à la transplantation ou au retrait de l'étude. Un critère de jugement combiné (IRT, ou diminution de 40 % du débit de filtration glomérulaire estimé après deux ans), ainsi que le taux de déclin de la fonction rénale et la rémission de la protéinurie sont les principaux critères de jugement. Les données phénotypiques cliniques et moléculaires seront analysées par sous-types de GN afin d'identifier les prédicteurs de la maladie et de découvrir de nouvelles cibles thérapeutiques. Limites: Le recrutement des sujets demeure un des principaux défis puisque les maladies glomérulaires prises individuellement sont relativement rares. La faible taille des échantillons et la courte durée du suivi pendant les deux ans de la phase initiale de l'étude pourraient faire en sorte que les études initiales issues du registre ne soient pas assez puissantes pour détecter de légères différences dans les résultats cliniquement significatifs comme l'IRT ou le décès. Conclusion: Le Canadian Glomerulonephritis Registry (CGNR) appuie les efforts de collaboration nationale visant à étudier les patients atteints de maladies glomérulaires et leur évolution clinique. Enregistrement de l'essai: NCT03460054.

6.
J Biol Chem ; 280(25): 23936-44, 2005 Jun 24.
Artigo em Inglês | MEDLINE | ID: mdl-15833747

RESUMO

C5L2 binds acylation-stimulating protein (ASP) with high affinity and is expressed in ASP-responsive cells. Functionality of C5L2 has not yet been demonstrated. Here we show that C5L2 is expressed in human subcutaneous and omental adipose tissue in both preadipocytes and adipocytes. In mice, C5L2 is expressed in all adipose tissues, at levels comparable with other tissues. Stable transfection of human C5L2 cDNA into HEK293 cells results in ASP stimulation of triglyceride synthesis (TGS) (193 +/- 33%, 5 microM ASP, p < 0.001, where basal = 100%) and glucose transport (168 +/- 21%, 10 microM ASP, p < 0.001). C3a similarly stimulates TGS (163 +/- 12%, p < 0.001), but C5a and C5a des-Arg have no effect. The ASP mechanism is to increase Vmax of glucose transport (149%) and triglyceride (TG) synthesis activity (165%) through increased diacylglycerolacyltransferase activity (200%). Antisense oligonucleotide down-regulation of C5L2 in human skin fibroblasts decreases cell surface C5L2 (down to 54 +/- 4% of control, p < 0.001, comparable with nonimmune background). ASP response is coordinately lost (basal TGS = 14.6 +/- 1.6, with ASP = 21.0 +/- 1.4 (144%), with ASP + oligonucleotides = 11.0 +/- 0.8 pmol of TG/mg of cell protein, p < 0.001). In mouse 3T3-L1 preadipocytes, antisense oligonucleotides decrease C5L2 expression to 69.5 +/- 0.5% of control, p < 0.001 (comparable with nonimmune) with a loss of ASP stimulation (basal TGS = 22.4 +/- 2.9, with ASP = 39.6 +/- 8.8 (177%), with ASP + oligonucleotides = 25.3 +/- 3.0 pmol of TG/mg of cell protein, p < 0.001). C5L2 down-regulation and decreased ASP response correlate (r = 0.761, p < 0.0001 for HSF and r = 0.451, p < 0.05 for 3T3-L1). In HEK-hC5L2 expressing fluorescently tagged beta-arrestin, ASP induced beta-arrestin translocation to the plasma membrane and formation of endocytic complexes concurrently with increased phosphorylation of C5L2. This is the first demonstration that C5L2 is a functional receptor, mediating ASP triglyceride stimulation.


Assuntos
Complemento C3a/metabolismo , Receptores de Quimiocinas/metabolismo , Animais , Arrestina/metabolismo , Sequência de Bases , Linhagem Celular , Primers do DNA , DNA Complementar , Humanos , Camundongos , Ligação Proteica , RNA Mensageiro/genética , Receptor da Anafilatoxina C5a , Receptores de Quimiocinas/genética
7.
Oncogene ; 22(22): 3353-60, 2003 May 29.
Artigo em Inglês | MEDLINE | ID: mdl-12776186

RESUMO

In the MCF-7 breast cancer cell line, insulin-like growth factors (IGFs) are known to elicit antiproliferative actions via the insulin receptor substrate-1 (IRS-1)/PI 3-kinase/AKT pathway. All-trans retinoic acid (RA) is a potent inhibitor of MCF-7 cell proliferation, but the mechanism by which growth regulation is achieved remains unclear. We investigated the effects of RA on the regulation of the IGF-IR and its key signaling elements: IRS-1, IRS-2, and SHC. Treatment of MCF-7 cells with RA caused a significant reduction in IRS-1 protein and tyrosine phosphorylation levels at a concentration and time consistent with RA-mediated growth inhibition. IRS-1 regulation is selective, as RA did not influence IRS-2 or SHC levels. Downstream signaling events were also selectively reduced, as RA abrogated IGF-I-stimulated AKT activation but did not alter erk1/2 activation. To confirm the importance of IRS-1 regulation by RA, we examined the response to RA in MCF-7 cells overexpressing IGF-IR and IRS-1. RA resistance was observed in MCF-7 cells overexpressing IRS-1 but not IGF-IR. This suggests that RA-mediated growth inhibition requires the selective downregulation of IRS-1 and AKT. Therapeutic agents targeting the IRS-1/PI 3-kinase/AKT pathway may enhance the cytostatic effects of RA in breast cancer, since overexpression of IRS-1 and AKT have been reported in primary breast tumors.


Assuntos
Fosfatidilinositol 3-Quinases/metabolismo , Fosfoproteínas/metabolismo , Proteínas Serina-Treonina Quinases , Proteínas Proto-Oncogênicas/metabolismo , Tretinoína/metabolismo , Neoplasias da Mama/metabolismo , Divisão Celular/efeitos dos fármacos , Regulação para Baixo , Feminino , Humanos , Técnicas In Vitro , Proteínas Substratos do Receptor de Insulina , Proteína Quinase 1 Ativada por Mitógeno/metabolismo , Proteína Quinase 3 Ativada por Mitógeno , Proteínas Quinases Ativadas por Mitógeno/metabolismo , Fosforilação , Proteínas Proto-Oncogênicas c-akt , Receptor IGF Tipo 1/metabolismo , Transdução de Sinais/efeitos dos fármacos , Transdução de Sinais/fisiologia , Tretinoína/farmacologia , Células Tumorais Cultivadas
SELEÇÃO DE REFERÊNCIAS
DETALHE DA PESQUISA
...