Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 20 de 80
Filtrar
1.
Kidney Int ; 106(1): 145-153, 2024 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-38537676

RESUMO

Patients with kidney failure on hemodialysis (KF-HD) are at high risk for both atherothrombotic events and bleeding. This Phase IIb study evaluated the dose-response of fesomersen, an inhibitor of hepatic Factor XI expression, versus placebo, for bleeding and atherothrombosis in patients with KF-HD. Patients were randomized to receive fesomersen 40, 80, or 120 mg once-monthly, or matching placebo, for up to 12 months. The primary safety endpoint was a composite of major bleeding and clinically relevant non-major bleeding (MB/CRNMB). Exploratory endpoints included post-dialysis arterio-venous (AV)-access bleeding, major atherothrombotic events (composite of fatal or non-fatal myocardial infarction, ischemic stroke, acute limb ischemia/major amputation, systemic embolism, symptomatic venous thromboembolism), AV-access thrombosis, and clotting of the hemodialysis circuit. Of 308 participants randomized, 307 received study treatment and were analyzed. Fesomersen led to a dose-dependent and sustained reduction of steady-state median FXI levels by 53.6% (40 mg group), 71.3% (80 mg group), 86.0% (120 mg group), versus 1.9% in the placebo group. MB/CRNMB events occurred in 6.5% (40 mg group), 5.1% (80 mg group), 3.9% (120 mg group), and in 4.0% of those receiving placebo (pooled fesomersen versus placebo P = 0.78). Major atherothrombotic events occurred in 1 patient (1.3%) in each treatment arm. MB/CRNMB bleeding and post-dialysis AV-access bleeding were not related to predicted FXI levels. Lower predicted FXI levels were associated with reductions in hemodialysis circuit clotting (P = 0.002) and AV-access thrombosis (P = 0.014). In patients with KF-HD, fesomersen produced a dose-dependent reduction in FXI levels associated with similar rates of major bleeding compared with placebo. REGISTRATION: URL: https://www.clinicaltrials.gov; unique identifier: NCT04534114.


Assuntos
Fator XI , Fibrinolíticos , Hemorragia , Diálise Renal , Trombose , Humanos , Diálise Renal/efeitos adversos , Masculino , Feminino , Pessoa de Meia-Idade , Idoso , Fator XI/antagonistas & inibidores , Fator XI/metabolismo , Fibrinolíticos/efeitos adversos , Fibrinolíticos/administração & dosagem , Hemorragia/induzido quimicamente , Hemorragia/etiologia , Trombose/etiologia , Trombose/prevenção & controle , Trombose/sangue , Método Duplo-Cego , Resultado do Tratamento , Oligonucleotídeos/efeitos adversos , Oligonucleotídeos/administração & dosagem , Oligonucleotídeos/uso terapêutico , Falência Renal Crônica/terapia , Falência Renal Crônica/complicações , Falência Renal Crônica/sangue , Falência Renal Crônica/diagnóstico , Relação Dose-Resposta a Droga
2.
Kidney Med ; 5(8): 100684, 2023 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-37502378

RESUMO

Rationale and Objective: Frailty is common among people with kidney failure treated with hemodialysis (HD). The objective was to describe how frailty evolves over time in people treated by HD, how improvements in frailty and frailty markers are associate with clinical outcomes, and the characteristics that are associated with improvement in frailty. Study Design: Prospective cohort study. Setting and Participants: Adults initiating thrice weekly in-center HD in Canada. Exposure: We classified frailty using a 5-point score (3 or more indicates frailty) based on physical inactivity, slowness or weakness, poor endurance or exhaustion, and malnutrition. We categorized the frailty trajectory as never present, improving, deteriorating, and always present. Outcomes: All-cause death, hospitalizations, and placement into long-term care. Analytical Approach: We examined the association between time-varying frailty measures and these outcomes using Cox and negative binomial models, after adjustment for potential confounders. Results: 985 participants were included and followed up for a median of 33 months; 507 (51%) died, 761 (77%) experienced ≥1 hospitalization and 115 (12%) entered long-term care. Overall, 760 (77%) reported frailty during follow-up. Three-quarters (78%) of those with frailty at baseline remained frail throughout the follow-up, 46% without baseline frailty became frail, and 23% with baseline frailty became nonfrail. Higher frailty scores were associated with an increased risk of mortality (fully adjusted HR, 1.58 per unit; 95% CI, 1.39-1.80) and an increased rate of hospitalization (RR, 1.16 per unit; 95% CI, 1.09-1.23). Compared with those who were frail throughout the follow-up, participants with frailty at baseline but improving during follow-up showed a lower mortality (HR, 0.59; 95% CI, 0.42-0.81), and a lower rate of hospitalization (RR, 0.70; 95% CI, 0.56-0.87). Limitations: There was missing data on frailty at baseline and during follow-up. Conclusions: Frailty was associated with a higher risk of poor outcomes compared with those without frailty, and participants whose status improved from frail to nonfrail showed better clinical outcomes than those who remained frail. These findings emphasize the importance of identifying and implementing effective treatments for frailty in patients receiving maintenance HD.

3.
J Am Heart Assoc ; 11(21): e025008, 2022 11.
Artigo em Inglês | MEDLINE | ID: mdl-36285795

RESUMO

Background Vitamin D supplementation leads to regression of left ventricular (LV) hypertrophy and improves LV function in animal models. However, limited data exist from prospective human studies. We examined whether vitamin D supplementation improved cardiac structure and function in midlife/older individuals in a large randomized trial. Methods and Results The VITAL (Vitamin D and OmegA-3 Trial) was a nationwide double-blind, placebo-controlled randomized trial that tested the effects of vitamin D3 (2000 IU/d) and n-3 fatty acids (1 g/d) on cardiovascular and cancer risk in 25 871 individuals aged ≥50 years. We conducted a substudy of VITAL in which participants underwent echocardiography at baseline and 2 years. Images were interpreted by a blinded investigator at a central core laboratory. The primary end point was change in LV mass. Among 1054 Greater Boston-area participants attending in-clinic visits, we enrolled 1025 into this study. Seventy-nine percent returned for follow-up and had analyzable echocardiograms at both visits. At baseline, the median age was 64 years (interquartile range, 60-69 years), 52% were men, and 43% had hypertension. After 2 years, the change in LV mass did not significantly differ between the vitamin D and placebo arms (median +1.4 g versus +2.6 g, respectively; P=0.32). Changes in systolic and diastolic LV function also did not differ significantly between arms. There were no significant changes in cardiac structure and function between the n-3 fatty acids and placebo arms. Conclusions Among adults aged ≥50 years, neither vitamin D3 nor n-3 fatty acids supplementation had significant effects on cardiac structure and function after 2 years. Registration URL: https://clinicaltrials.gov/; Unique identifiers: NCT01169259 (VITAL) and NCT01630213 (VITAL-Echo).


Assuntos
Colecalciferol , Ácidos Graxos Ômega-3 , Adulto , Masculino , Humanos , Pessoa de Meia-Idade , Feminino , Colecalciferol/uso terapêutico , Estudos Prospectivos , Suplementos Nutricionais , Vitaminas/uso terapêutico , Vitamina D/uso terapêutico , Ácidos Graxos Ômega-3/uso terapêutico , Método Duplo-Cego
4.
PLoS One ; 16(7): e0254158, 2021.
Artigo em Inglês | MEDLINE | ID: mdl-34242315

RESUMO

BACKGROUND: Bioavailable 25-hydroxyvitamin D (25OHD) may be a better indicator of vitamin D sufficiency than total 25OHD. This report describes a novel assay for measuring serum bioavailable 25OHD. METHODS: We developed an assay for 25OHD % bioavailability based on competitive binding of 25OHD tracer between vitamin D-binding protein (DBP)-coated affinity chromatography beads and serum DBP. Bioavailable 25OHD, total 25OHD, albumin, and DBP protein concentrations were measured in 89 samples from hospitalized patients and 42 healthy controls to determine how the DBP binding assay responds to differences in concentrations of DBP and compares to calculated bioavailable 25OHD values. RESULTS: DBP binding assay showed a linear relationship between DBP-bound 25OHD tracer recovered from bead supernatant and DBP calibrator concentrations (y = 0.0017x +0.731, R2 = 0.9961, p<0.001). Inversion of this relationship allowed interpolation of DBP binding equivalents based upon 25OHD tracer recovered. The relationship between DBP binding equivalents and % bioavailability fits a non-linear curve, allowing calculation of % bioavailable 25OHD from DBP binding equivalents (y = 10.625x-0.817, R2 = 0.9961, p<0.001). In hospitalized patient samples, there were linear relationships between DBP protein concentrations and DBP binding equivalents (y = 0.7905x + 59.82, R2 = 0.8597, p<0.001), between measured vs. calculated % bioavailability (y = 0.9528 + 0.0357, R2 = 0.7200, p<0.001), and between absolute concentrations of measured vs. calculated bioavailable 25OHD (y = 1.2403 + 0.1221, R2 = 0.8913, p<0.001). CONCLUSIONS: The DBP-binding assay for bioavailable 25OHD shows expected changes in 25OHD % bioavailability in response to changes in DBP concentrations and concordance with calculated bioavailable 25OHD concentrations.


Assuntos
Vitamina D/análogos & derivados , Adulto , Disponibilidade Biológica , Humanos
5.
J Pharmacol Exp Ther ; 376(1): 12-20, 2021 01.
Artigo em Inglês | MEDLINE | ID: mdl-33115823

RESUMO

Faced with the health and economic consequences of the global spread of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), the biomedical community came together to identify, diagnose, prevent, and treat the novel disease at breathtaking speeds. The field advanced from a publicly available viral genome to a commercialized globally scalable diagnostic biomarker test in less than 2 months, and first-in-human dosing with vaccines and repurposed antivirals followed shortly thereafter. This unprecedented efficiency was driven by three key factors: 1) international multistakeholder collaborations, 2) widespread data sharing, and 3) flexible regulatory standards tailored to meet the urgency of the situation. Learning from the remarkable success achieved during this public health crisis, we are proposing a biomarker-centric approach throughout the drug development pipeline. Although all therapeutic areas would benefit from end-to-end biomarker science, efforts should be prioritized to areas with the greatest unmet medical needs, including neurodegenerative diseases, chronic lower respiratory diseases, metabolic disorders, and malignant neoplasms. SIGNIFICANCE STATEMENT: Faced with the unprecedented threat of the severe acute respiratory syndrome coronavirus 2 pandemic, the biomedical community collaborated to develop a globally scalable diagnostic biomarker (viral DNA) that catalyzed therapeutic development at breathtaking speeds. Learning from this remarkable efficiency, we propose a multistakeholder biomarker-centric approach to drug development across therapeutic areas with unmet medical needs.


Assuntos
Antivirais/uso terapêutico , COVID-19/epidemiologia , Defesa Civil/tendências , Desenvolvimento de Medicamentos/tendências , Descoberta de Drogas/tendências , Animais , Biomarcadores/análise , COVID-19/genética , Defesa Civil/métodos , Desenvolvimento de Medicamentos/métodos , Descoberta de Drogas/métodos , Marcadores Genéticos/genética , Humanos , Pandemias , Tratamento Farmacológico da COVID-19
6.
Am J Nephrol ; 51(9): 705-714, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32781443

RESUMO

BACKGROUND: Impaired mobility is associated with functional dependence, frailty, and mortality in prevalent patients undergoing dialysis. We investigated risk factors for mobility impairment, (poor gait speed) in patients incident to dialysis, and changes in gait speed over time in a 2-year longitudinal study. METHODS: One hundred eighty-three patients enrolled within 6 months of dialysis initiation were followed up 6, 12, and 24 months later. Grip strength, health-related quality of life, and comorbidities were assessed at baseline. Outcomes were (a) baseline gait speed and (b) change in gait speed over time. Gait speed was assessed by 4-meter walk. Multivariate linear regression was used to identify risk factors for low gait speed at baseline. For longitudinal analyses, linear mixed effects modeling with gait speed modeled over time was used as the outcome. RESULTS: Participants were 54.7 ± 12.8 years old, 52.5% men, 73.9% black with mean dialysis vintage of 100.1 ± 46.9 days and median gait speed 0.78 (0.64-0.094) m/s. Lower health utility and grip strength, diabetic nephropathy, and walking aids were associated with lower baseline gait speed. Loss of 0.1 m/s gait speed occurred in 24% of subjects at 1 year. In multivariate mixed effects models, only age, walking aid use, lower health utility, and lower handgrip strength were significantly associated with gait speed loss. CONCLUSIONS: In our cohort of incident dialysis patients, overall gait speed is very low and 54.2% of the subjects continue to lose gait speed over 2 years. Older age, lower handgrip strength, and quality of life are risk factors for slowness. Patients at highest risk of poor gait speed can be identified at dialysis initiation to allow targeted implementation of therapeutic options.


Assuntos
Fragilidade/diagnóstico , Qualidade de Vida , Diálise Renal/efeitos adversos , Insuficiência Renal Crônica/terapia , Velocidade de Caminhada/fisiologia , Adulto , Fatores Etários , Idoso , Progressão da Doença , Feminino , Seguimentos , Fragilidade/epidemiologia , Fragilidade/etiologia , Fragilidade/fisiopatologia , Força da Mão/fisiologia , Humanos , Estudos Longitudinais , Masculino , Pessoa de Meia-Idade , Insuficiência Renal Crônica/complicações , Insuficiência Renal Crônica/fisiopatologia , Fatores de Risco
7.
Hypertension ; 76(3): 875-883, 2020 09.
Artigo em Inglês | MEDLINE | ID: mdl-32654553

RESUMO

Elevated circulating sFLT-1 (soluble fms-like tyrosine kinase) and low levels of its ligand, PlGF (placental growth factor), are key characteristics of preeclampsia. However, it is unclear if the low levels of plasma PlGF noted during preeclampsia are due to decreased placental production of PlGF or due to binding of PlGF by increased circulating sFLT-1. Here, we describe a biochemical procedure to dissociate PlGF-sFLT-1 complex ex vivo and when used in conjunction with an immunoassay platform, demonstrate a method to measure total and free PlGF in human blood samples. Using this method, we noted that plasma free PlGF levels were significantly lower in preeclampsia (N=22) than in nonhypertensive controls (N=24; mean, 314 versus 686 pg/mL, P<0.05), but total PlGF levels were not different (mean, 822 versus 800 pg/mL, P=0.49). In contrast, total sFLT-1 levels were significantly higher in preeclampsia than in nonhypertensive controls (mean, 16 957 versus 3029 pg/mL, P<0.01) and sFLT-1 levels correlated with bound PlGF levels (bound PlGF=total PlGF-free PlGF) in these samples (r2=0.68). We confirmed these findings in an independent cohort of subjects (N=49). Furthermore, we did not detect any difference in PlGF mRNA by quantitative polymerase chain reaction or in PlGF protein expression by immunohistochemistry in preeclamptic placentas when compared with nonhypertensive controls. In contrast, sFLT-1 mRNA and protein levels were upregulated in placentas from women with preeclampsia. Taken together with prior studies, our results provide evidence that decrease in circulating PlGF noted during preeclampsia is largely mediated by excess circulating sFLT-1.


Assuntos
Fator de Crescimento Placentário , Placenta/metabolismo , Pré-Eclâmpsia/sangue , Receptor 1 de Fatores de Crescimento do Endotélio Vascular , Adulto , Biomarcadores/sangue , Biomarcadores/metabolismo , Feminino , Humanos , Imunoensaio/métodos , Imuno-Histoquímica , Neovascularização Fisiológica , Fator de Crescimento Placentário/sangue , Fator de Crescimento Placentário/metabolismo , Pré-Eclâmpsia/diagnóstico , Gravidez , Receptor 1 de Fatores de Crescimento do Endotélio Vascular/sangue , Receptor 1 de Fatores de Crescimento do Endotélio Vascular/metabolismo
8.
Kidney360 ; 1(2): 86-92, 2020 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-32529191

RESUMO

BACKGROUND: Uremic symptoms are major contributors to the poor quality of life among patients on dialysis, but whether their prevalence or intensity has changed over time is unknown. METHODS: We examined responses to validated questionnaires in two incident dialysis cohort studies, the Choices for Health Outcomes in Caring for ESRD (CHOICE) study (N=926, 1995-1998) and the Longitudinal United States/Canada Incident Dialysis (LUCID) study (N=428, 2011-2017). We determined the prevalence and severity of uremic symptoms-anorexia, nausea/vomiting, pruritus, sleepiness, difficulty concentrating, fatigue, and pain-in both cohorts. RESULTS: In CHOICE and LUCID, respectively, mean age of the participants was 58 and 60 years, 53% and 60% were male, and 28% and 32% were black. In both cohorts, 54% of the participants had diabetes. Median time from dialysis initiation to the symptoms questionnaires was 45 days for CHOICE and 77 days for LUCID. Uremic symptom prevalence in CHOICE did not change from baseline to 1-year follow-up and was similar across CHOICE and LUCID. Baseline symptom prevalence in CHOICE and LUCID was as follows: anorexia (44%, 44%, respectively), nausea/vomiting (36%, 43%), pruritus (72%, 63%), sleepiness (86%, 68%), difficulty concentrating (55%, 57%), fatigue (89%, 77%), and pain (82%, 79%). In both cohorts, >80% of patients had three or more symptoms and >50% had five or more symptoms. The correlation between individual symptoms was low (ρ<0.5 for all comparisons). In CHOICE, no clinical or laboratory parameter was strongly associated with multiple symptoms. CONCLUSIONS: The burden of uremic symptoms among patients on dialysis is substantial and has not changed in the past 15 years. Improving quality of life will require identification of the factors that underlie the pathogenesis of uremic symptoms and better ways of removing the toxins that are responsible.


Assuntos
Qualidade de Vida , Diálise Renal , Humanos , Masculino , Pessoa de Meia-Idade , Prevalência , Prurido/epidemiologia , Diálise Renal/efeitos adversos , Inquéritos e Questionários
9.
Clin J Am Soc Nephrol ; 15(3): 384-391, 2020 03 06.
Artigo em Inglês | MEDLINE | ID: mdl-32111702

RESUMO

BACKGROUND AND OBJECTIVES: In the United States, intravenous vitamin D analogs are the first-line therapy for management of secondary hyperparathyroidism in hemodialysis patients. Outside the United States, oral calcitriol (1,25-dihydroxyvitamin D3) is routinely used. We examined standard laboratory parameters of patients on in-center hemodialysis receiving intravenous vitamin D who switched to oral calcitriol. DESIGN, SETTING, PARTICIPANTS, & MEASUREMENTS: We conducted a retrospective cohort study of adult patients treated within Fresenius Kidney Care clinics. During a 6-month period (December 2013 to May 2014), we identified patients on an intravenous vitamin D analog (doxercalciferol or paricalcitol) who switched to oral calcitriol and matched them to patients receiving an intravenous vitamin D analog. Mean serum calcium, phosphate, and intact parathyroid hormone (iPTH) concentrations were examined for up to 12 months of follow-up. We used Poisson and Cox proportional hazards regression models to examine hospitalization and survival rates. The primary analysis was conducted as intention-to-treat; secondary analyses included an as-treated evaluation. RESULTS: A total of 2280 patients who switched to oral calcitriol were matched to 2280 patients receiving intravenous vitamin D. Compared with patients on intravenous vitamin D, mean calcium and phosphate levels in the oral calcitriol group were lower after the change to oral calcitriol. In contrast, iPTH levels were higher in the oral calcitriol group. At 12 months, the percentage of patients with composite laboratories in target range (calcium <10 mg/dl, phosphate 3.0-5.5 mg/dl, and iPTH 150-600 pg/ml) were comparable between groups (45% versus 45%; P=0.96). Hospital admissions, length of hospital stay, and survival were comparable between groups. An as-treated analysis and excluding those receiving cinacalcet did not reveal significant between-group differences. CONCLUSIONS: Among patients receiving in-center hemodialysis who were switched to oral calcitriol versus those on an intravenous vitamin D analog, the aggregate of all mineral and bone laboratory parameters in range was largely similar between groups.


Assuntos
Calcitriol/administração & dosagem , Distúrbio Mineral e Ósseo na Doença Renal Crônica/tratamento farmacológico , Substituição de Medicamentos , Ergocalciferóis/administração & dosagem , Hiperparatireoidismo Secundário/tratamento farmacológico , Falência Renal Crônica/terapia , Diálise Renal , Vitaminas/administração & dosagem , Administração Intravenosa , Administração Oral , Idoso , Biomarcadores/sangue , Cálcio/sangue , Distúrbio Mineral e Ósseo na Doença Renal Crônica/sangue , Distúrbio Mineral e Ósseo na Doença Renal Crônica/diagnóstico , Distúrbio Mineral e Ósseo na Doença Renal Crônica/etiologia , Feminino , Humanos , Hiperparatireoidismo Secundário/sangue , Hiperparatireoidismo Secundário/diagnóstico , Hiperparatireoidismo Secundário/etiologia , Falência Renal Crônica/diagnóstico , Masculino , Pessoa de Meia-Idade , Hormônio Paratireóideo/sangue , Fosfatos/sangue , Diálise Renal/efeitos adversos , Estudos Retrospectivos , Fatores de Tempo , Resultado do Tratamento , Estados Unidos
10.
J Clin Invest ; 130(3): 1513-1526, 2020 03 02.
Artigo em Inglês | MEDLINE | ID: mdl-32065590

RESUMO

Fibroblast growth factor 23 (FGF23) is a bone-derived hormone that controls blood phosphate levels by increasing renal phosphate excretion and reducing 1,25-dihydroxyvitamin D3 [1,25(OH)2D] production. Disorders of FGF23 homeostasis are associated with significant morbidity and mortality, but a fundamental understanding of what regulates FGF23 production is lacking. Because the kidney is the major end organ of FGF23 action, we hypothesized that it releases a factor that regulates FGF23 synthesis. Using aptamer-based proteomics and liquid chromatography-mass spectrometry-based (LC-MS-based) metabolomics, we profiled more than 1600 molecules in renal venous plasma obtained from human subjects. Renal vein glycerol-3-phosphate (G-3-P) had the strongest correlation with circulating FGF23. In mice, exogenous G-3-P stimulated bone and bone marrow FGF23 production through local G-3-P acyltransferase-mediated (GPAT-mediated) lysophosphatidic acid (LPA) synthesis. Further, the stimulatory effect of G-3-P and LPA on FGF23 required LPA receptor 1 (LPAR1). Acute kidney injury (AKI), which increases FGF23 levels, rapidly increased circulating G-3-P in humans and mice, and the effect of AKI on FGF23 was abrogated by GPAT inhibition or Lpar1 deletion. Together, our findings establish a role for kidney-derived G-3-P in mineral metabolism and outline potential targets to modulate FGF23 production during kidney injury.


Assuntos
Injúria Renal Aguda/metabolismo , Fatores de Crescimento de Fibroblastos/metabolismo , Glicerofosfatos/metabolismo , Rim/metabolismo , Injúria Renal Aguda/genética , Injúria Renal Aguda/patologia , Animais , Linhagem Celular , Feminino , Fator de Crescimento de Fibroblastos 23 , Fatores de Crescimento de Fibroblastos/genética , Humanos , Rim/patologia , Masculino , Metabolômica , Camundongos , Camundongos Knockout , Receptores de Ácidos Lisofosfatídicos/genética , Receptores de Ácidos Lisofosfatídicos/metabolismo
11.
Am J Nephrol ; 51(12): 995-1003, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-33486484

RESUMO

BACKGROUND: Sickle cell disease (SCD) is the most common inherited hematological disorder and a well-described risk factor for end-stage kidney disease (ESKD). Mortality and hospitalizations among patients with SCD who develop ESKD remain understudied. Furthermore, prior studies focused only on SCD patients where ESKD was caused by SCD. We aimed to describe mortality and hospitalization risk in all SCD patients initiating dialysis and explore risk factors for mortality and hospitalization. METHODS: We performed a national observational cohort study of African American ESKD patients initiating dialysis (2000-2014) in facilities affiliated with a large dialysis provider. SCD was identified by diagnosis codes and matched to a reference population (non-SCD) by age, sex, dialysis initiation year, and geographic region of care. Sensitivity analyses were conducted by restricting to patients where SCD was recorded as the cause of ESKD. RESULTS: We identified 504 SCD patients (mean age: 47 ± 14 years; 48% females) and 1,425 reference patients (mean age: 46 ± 14 years; 49% females). The median follow-up was 2.4 (IQR 1.0-4.5) years. Compared to the reference, SCD was associated with higher mortality risk (hazard ratio 1.66; 95% confidence interval [CI]: 1.36-2.03) and higher hospitalization rates (incidence rate ratio 2.12; 95% CI: 1.88-2.38) in multivariable analyses. Exploratory multivariable mortality risk models showed the largest mortality risk attenuation with the addition of time-varying hemoglobin and high-dose erythropoietin, but the association of SCD with mortality remained significant. Sensitivity analyses (restricted to ESKD caused by SCD) also showed significant associations between SCD and mortality and hospitalizations, but with larger effect estimates. High-dose erythropoietin was associated with the highest risk for mortality and hospitalization in SCD. CONCLUSIONS: Among ESKD patients, SCD is associated with a higher risk for mortality and hospitalization, particularly in patients where SCD is identified as the cause of ESKD.


Assuntos
Anemia Falciforme/complicações , Hospitalização/estatística & dados numéricos , Falência Renal Crônica/mortalidade , Falência Renal Crônica/terapia , Diálise Renal , Adulto , Idoso , Estudos de Coortes , Feminino , Humanos , Falência Renal Crônica/etiologia , Masculino , Pessoa de Meia-Idade
12.
J Am Soc Nephrol ; 31(2): 393-404, 2020 02.
Artigo em Inglês | MEDLINE | ID: mdl-31810990

RESUMO

BACKGROUND: Sickle cell trait and sickle cell disease are thought to be independent risk factors for CKD, but the trajectory and predictors of kidney function decline in patients with these phenotypes are not well understood. METHODS: Our multicenter, observational study used registry data (collected January 2005 through June 2018) and included adult black patients with sickle cell trait or disease (exposures) or normal hemoglobin phenotype (reference) status (ascertained by electrophoresis) and at least 1 year of follow-up and three eGFR values. We used linear mixed models to evaluate the difference in the mean change in eGFR per year. RESULTS: We identified 1251 patients with sickle cell trait, 230 with sickle cell disease, and 8729 reference patients, with a median follow-up of 8 years. After adjustment, eGFR declined significantly faster in patients with sickle cell trait or sickle cell disease compared with reference patients; it also declined significantly faster in patients with sickle cell disease than in patients with sickle cell trait. Male sex, diabetes mellitus, and baseline eGFR ≥90 ml/min per 1.73 m2 were associated with faster eGFR decline for both phenotypes. In sickle cell trait, low hemoglobin S and elevated hemoglobin A were associated with faster eGFR decline, but elevated hemoglobins F and A2 were renoprotective. CONCLUSIONS: Sickle cell trait and disease are associated with faster eGFR decline in black patients, with faster decline in sickle cell disease. Low hemoglobin S was associated with faster eGFR decline in sickle cell trait but may be confounded by concurrent hemoglobinopathies. Prospective and mechanistic studies are needed to develop best practices to attenuate eGFR decline in such patients.


Assuntos
Anemia Falciforme/fisiopatologia , Taxa de Filtração Glomerular/fisiologia , Traço Falciforme/fisiopatologia , Adulto , População Negra , Estudos de Coortes , Feminino , Hemoglobina Falciforme/análise , Humanos , Masculino , Pessoa de Meia-Idade , Insuficiência Renal Crônica/fisiopatologia
13.
J Am Soc Nephrol ; 30(5): 890-903, 2019 05.
Artigo em Inglês | MEDLINE | ID: mdl-31000566

RESUMO

BACKGROUND: Data from clinical trials to inform practice in maintenance hemodialysis are limited. Incorporating randomized trials into dialysis clinical care delivery should help generate practice-guiding evidence, but the feasibility of this approach has not been established. METHODS: To develop approaches for embedding trials into routine delivery of maintenance hemodialysis, we performed a cluster-randomized, pragmatic trial demonstration project, the Time to Reduce Mortality in ESRD (TiME) trial, evaluating effects of session duration on mortality (primary outcome) and hospitalization rate. Dialysis facilities randomized to the intervention adopted a default session duration ≥4.25 hours (255 minutes) for incident patients; those randomized to usual care had no trial-driven approach to session duration. Implementation was highly centralized, with no on-site research personnel and complete reliance on clinically acquired data. We used multiple strategies to engage facility personnel and participating patients. RESULTS: The trial enrolled 7035 incident patients from 266 dialysis units. We discontinued the trial at a median follow-up of 1.1 years because of an inadequate between-group difference in session duration. For the primary analysis population (participants with estimated body water ≤42.5 L), mean session duration was 216 minutes for the intervention group and 207 minutes for the usual care group. We found no reduction in mortality or hospitalization rate for the intervention versus usual care. CONCLUSIONS: Although a highly pragmatic design allowed efficient enrollment, data acquisition, and monitoring, intervention uptake was insufficient to determine whether longer hemodialysis sessions improve outcomes. More effective strategies for engaging clinical personnel and patients are likely required to evaluate clinical trial interventions that are fully embedded in care delivery.


Assuntos
Causas de Morte , Falência Renal Crônica/mortalidade , Falência Renal Crônica/terapia , Avaliação de Resultados em Cuidados de Saúde , Diálise Renal/mortalidade , Diálise Renal/métodos , Assistência Ambulatorial/métodos , Análise por Conglomerados , Feminino , Humanos , Falência Renal Crônica/diagnóstico , Masculino , Taxa de Sobrevida , Fatores de Tempo , Estados Unidos
14.
PLoS One ; 14(3): e0213764, 2019.
Artigo em Inglês | MEDLINE | ID: mdl-30883578

RESUMO

INTRODUCTION: Studies on metabolomics and CKD have primarily addressed CKD incidence defined as a decline on eGFR or appearance of albuminuria in the general population, with very few evaluating hard outcomes. In the present study, we investigated the association between metabolites and mortality and ESRD in a CKD cohort. SETTING AND METHODS: Data on 454 participants of the Progredir Cohort Study, Sao Paulo, Brazil were used. Metabolomics was performed by GC-MS (Agilent MassHunter) and metabolites were identified using Agilent Fiehn GC/MS and NIST libraries. After excluding metabolites present in <50% of participants, 293 metabolites were analyzed. An FDR q value <0.05 criteria was applied in Cox models on the composite outcome (mortality or incident renal replacement therapy) adjusted for batch effect, resulting in 34 metabolites associated with the outcome. Multivariable-adjusted Cox models were then built for the composite outcome, death, and ESRD incident events. Competing risk analysis was also performed for ESRD. RESULTS: Mean age was 68±12y, mean eGFR-CKDEPI was 38.4±14.6 ml/min/1.73m2 and 57% were diabetic. After adjustments (GC-MS batch, sex, age, DM and eGFR), 18 metabolites remained significantly associated with the composite outcome. Nine metabolites were independently associated with death: D-malic acid (HR 1.84, 95%CI 1.32-2.56, p = 0.0003), acetohydroxamic acid (HR 1.90, 95%CI 1.30-2.78, p = 0.0008), butanoic acid (HR 1.59, 95%CI 1.17-2.15, p = 0.003), and docosahexaenoic acid (HR 0.58, 95%CI 0.39-0.88, p = 0.009), among the top associations. Lactose (SHR 1.49, 95%CI 1.04-2.12, p = 0.03), 2-O-glycerol-α-D-galactopyranoside (SHR 1.76, 95%CI 1.06-2.92, p = 0.03), and tyrosine (SHR 0.52, 95%CI 0.31-0.88, p = 0.02) were associated to ESRD risk, while D-threitol, mannitol and myo-inositol presented strong borderline associations. CONCLUSION: Our results identify specific metabolites related to hard outcomes in a CKD population. These findings point to the need of further exploration of these metabolites as biomarkers in CKD and the understanding of the underlying biological mechanisms related to the observed associations.


Assuntos
Biomarcadores/análise , Falência Renal Crônica/patologia , Metabolômica , Insuficiência Renal Crônica/patologia , Idoso , Estudos de Coortes , Feminino , Cromatografia Gasosa-Espectrometria de Massas , Taxa de Filtração Glomerular , Humanos , Ácidos Hidroxâmicos/análise , Falência Renal Crônica/metabolismo , Falência Renal Crônica/mortalidade , Malatos/análise , Masculino , Pessoa de Meia-Idade , Modelos de Riscos Proporcionais , Insuficiência Renal Crônica/metabolismo , Insuficiência Renal Crônica/mortalidade , Fatores de Risco , Álcoois Açúcares/análise , Taxa de Sobrevida
16.
Am J Nephrol ; 49(2): 93-102, 2019.
Artigo em Inglês | MEDLINE | ID: mdl-30625463

RESUMO

BACKGROUND: Sickle cell trait (SCT) is common among African Americans and has been historically considered to be benign. Recently, SCT has been associated with an increased risk for chronic kidney disease (CKD) and cardiovascular disease in the general population. Our understanding of SCT has been extrapolated largely from data of patients with sickle cell disease (SCD). Notably, in SCD, the outcomes differ by sex. The effect of SCT on cardiovascular risk in the African American CKD population is unknown, and the interaction between SCT and sex on cardiovascular risk has not been investigated. METHODS: We performed a 2-center retrospective cohort study of all African American patients with SCT using international classification of disease diagnosis codes and CKD (using the 2012 Kidney Disease Improving Global Outcomes criteria) with at least 1 year of follow-up between January 2005 and December 2017. A reference group of -African American CKD patients without SCT was used as a comparator during the same period. SCT patients and the reference patients were matched at baseline for age, sex, comorbidities, and proteinuria. Primary outcomes were incident coronary artery disease (CAD), incident stroke, and all-cause mortality. Analysis of effect modification between sex and SCT on primary outcomes was performed. RESULTS: We identified 621 African American CKD patients, 217 SCT patients, and 404 reference patients. The mean age was 56 ± 13 years and 66% were female. The mean estimated glomerular filtration rate was 69 ± 30 mL/min. The mean follow-up time was 8 ± 4 years. There were no significant differences in the primary outcomes comparing SCT patients to matched controls. The interaction term between SCT and sex, however, was significant in the CAD model (p < 0.01). Stratification by sex showed no increased risk in females but a significantly increased risk for CAD in male SCT patients (hazard ratio [HR] 2.14; 95% CI 1.18-3.86), which persisted after multivariable analysis (HR 2.13; 95% CI 1.17-3.86). CONCLUSION: SCT is associated with an increased risk for CAD in African American males with CKD. The excess risk in males with SCT appears to follow the same pattern as risk in males with SCD. Larger studies are needed to confirm these findings.


Assuntos
Negro ou Afro-Americano/estatística & dados numéricos , Doenças Cardiovasculares/epidemiologia , Insuficiência Renal Crônica/complicações , Traço Falciforme/complicações , Adulto , Negro ou Afro-Americano/genética , Idoso , Doenças Cardiovasculares/genética , Feminino , Seguimentos , Taxa de Filtração Glomerular , Humanos , Masculino , Pessoa de Meia-Idade , Sistema de Registros/estatística & dados numéricos , Insuficiência Renal Crônica/genética , Estudos Retrospectivos , Medição de Risco , Fatores de Risco , Fatores Sexuais , Traço Falciforme/genética , Estados Unidos/epidemiologia
17.
Hepatology ; 69(2): 729-741, 2019 02.
Artigo em Inglês | MEDLINE | ID: mdl-30141205

RESUMO

Acute kidney injury in decompensated cirrhosis has limited therapeutic options, and novel mechanistic targets are urgently needed. Angiopoietin-2 is a context-specific antagonist of Tie2, a receptor that signals vascular quiescence. Considering the prominence of vascular destabilization in decompensated cirrhosis, we evaluated Angiopoietin-2 to predict clinical outcomes. Serum Angiopoietin-2 was measured serially in a prospective cohort of hospitalized patients with decompensated cirrhosis and acute kidney injury. Clinical characteristics and outcomes were examined over a 90-day period and analyzed according to Angiopoietin-2 levels. Primary outcome was 90-day mortality. Our study included 191 inpatients (median Angiopoietin-2 level 18.2 [interquartile range 11.8, 26.5] ng/mL). Median Model for End-Stage Liver Disease (MELD) score was 23 [17, 30] and 90-day mortality was 41%. Increased Angiopoietin-2 levels were associated with increased mortality (died 21.9 [13.9, 30.3] ng/mL vs. alive 15.2 [9.8, 23.0] ng/mL; P < 0.001), higher Acute Kidney Injury Network stage (stage I 13.4 [9.8, 20.1] ng/mL vs. stage II 20.0 [14.1, 26.2] ng/mL vs. stage III 21.9 [13.0, 29.5] ng/mL; P = 0.002), and need for renal replacement therapy (16.5 [11.3, 23.6] ng/mL vs. 25.1 [13.3, 30.3] ng/mL; P = 0.005). The association between Angiopoietin-2 and mortality was significant in unadjusted and adjusted Cox regression models (P ≤ 0.001 for all models), and improved discrimination for mortality when added to MELD score (integrated discrimination increment 0.067; P = 0.001). Conclusion: Angiopoietin-2 was associated with mortality and other clinically relevant outcomes in a cohort of patients with decompensated cirrhosis with acute kidney injury. Further experimental study of Angiopoietin/Tie2 signaling is warranted to explore its potential mechanistic and therapeutic role in this population.


Assuntos
Injúria Renal Aguda/sangue , Angiopoietina-2/sangue , Cirrose Hepática/sangue , Cirrose Hepática/mortalidade , Injúria Renal Aguda/etiologia , Idoso , Feminino , Humanos , Cirrose Hepática/complicações , Cirrose Hepática/cirurgia , Transplante de Fígado , Masculino , Massachusetts/epidemiologia , Pessoa de Meia-Idade , Estudos Prospectivos
18.
Blood Purif ; 47(1-3): 205-213, 2019.
Artigo em Inglês | MEDLINE | ID: mdl-30517931

RESUMO

BACKGROUND: Compared to the past, patients with sickle cell disease (SCD) currently live longer due to improvements in diagnosis and comprehensive care. Due to these advances, long-term chronic complications pose a greater challenge in the management of patients with SCD. In particular, sickle cell nephropathy (SCN) is associated with significant morbidity and mortality across all age groups. Furthermore, SCN is an understudied condition with relatively few symptoms and therefore requires close surveillance. In this review, we sought to explore the epidemiology, natural history, and treatment options for SCN with an emphasis on the pediatric population. SUMMARY: SCN invariably begins in childhood with evidence of structural changes detected as early as infancy. These indolent changes can progress undetected to advanced chronic kidney disease by late adolescence or early adulthood. The risk factors for progression are not well defined, but significant albuminuria (which is also the most common presentation in childhood) is a key factor in progression. One of the main challenges in understanding SCN in children is the poor correlation between estimated and measured glomerular filtration rates. Another challenge is the lack of large-scale longitudinal studies that track the clinical outcomes of pediatric patients over time. Several studies aim to identify early biomarkers of SCN in children, as albuminuria presents only following significant chronic damage. The utility of angiotensin converting enzyme inhibitors and hydroxyurea in treating albuminuria is addressed here as well as novel treatments that may be of benefit.


Assuntos
Albuminúria , Anemia Falciforme , Inibidores da Enzima Conversora de Angiotensina/uso terapêutico , Hidroxiureia/uso terapêutico , Nefropatias , Adolescente , Adulto , Albuminúria/sangue , Albuminúria/tratamento farmacológico , Albuminúria/etiologia , Anemia Falciforme/sangue , Anemia Falciforme/complicações , Anemia Falciforme/tratamento farmacológico , Biomarcadores , Criança , Pré-Escolar , Feminino , Humanos , Lactente , Nefropatias/sangue , Nefropatias/tratamento farmacológico , Nefropatias/etiologia , Masculino
20.
Am J Pathol ; 188(10): 2147-2154, 2018 10.
Artigo em Inglês | MEDLINE | ID: mdl-30253844

RESUMO

There is a temporal window from the time diabetes is diagnosed to the appearance of overt kidney disease during which time the disease progresses quietly without detection. Currently, there is no way to detect early diabetic nephropathy (EDN). Herein, we performed an unbiased assessment of gene-expression analysis of postmortem human kidneys to identify candidate genes that may contribute to EDN. We then studied one of the most promising differentially expressed genes in both kidney tissue and blood samples. Differential transcriptome analysis of EDN kidneys and matched nondiabetic controls showed alterations in five canonical pathways, and among them the complement pathway was the most significantly altered. One specific complement pathway gene, complement 7 (C7), was significantly elevated in EDN kidney. Real-time PCR confirmed more than a twofold increase of C7 expression in EDN kidneys compared with controls. Changes in C7 gene product level were confirmed by immunohistochemistry. C7 protein levels were elevated in proximal tubules of EDN kidneys. Serum C7 protein levels were also measured in EDN and control donors. C7 levels were significantly higher in EDN serum than control serum. This latter finding was independently confirmed in a second set of blood samples from a previously collected data set. Together, our data suggest that C7 is associated with EDN, and can be used as a molecular target for detection and/or treatment of EDN.


Assuntos
Complemento C7/metabolismo , Nefropatias Diabéticas/diagnóstico , Adolescente , Adulto , Idoso , Complemento C7/genética , Nefropatias Diabéticas/genética , Diagnóstico Precoce , Feminino , Marcadores Genéticos/genética , Humanos , Rim/metabolismo , Masculino , Pessoa de Meia-Idade , Insuficiência Renal Crônica/genética , Insuficiência Renal Crônica/metabolismo , Regulação para Cima/genética , Regulação para Cima/fisiologia , Adulto Jovem
SELEÇÃO DE REFERÊNCIAS
DETALHE DA PESQUISA
...