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1.
Diabetes Obes Metab ; 18(2): 169-77, 2016 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-26511599

RESUMO

AIMS: To investigate whether the degree of albuminuria reduction observed in the ALTITUDE trial is associated with renal and cardiovascular protection, and secondly, whether the reduction in albuminuria was too small to afford clinical benefit. METHODS: In a post hoc analysis of the ALTITUDE trial in 8561 patients with type 2 diabetes and chronic kidney disease or cardiovascular disease we examined the effect of albuminuria changes at 6 months on renal and cardiovascular outcomes using Cox proportional hazard regression. RESULTS: The median change in albuminuria in the first 6 months in the aliskiren arm of the trial was -12% (25th to 75th percentile: -48.7_to_ +41.9%) and 0.0% (25th to 75th percentile: -40.2_to_55%) in the placebo arm. Changes in albuminuria in the first 6 months were linearly associated with renal and cardiovascular endpoints: a >30% reduction in albuminuria in the first 6 months was associated with a 62% reduction in renal risk and a 25% reduction in cardiovascular risk compared with an increase in albuminuria. The association between changes at 6 months in albuminuria and renal or cardiovascular endpoints was similar in the two treatment groups (p for interaction >0.1 for both endpoints). CONCLUSIONS: The addition of aliskiren to angiotensin-converting enzyme inhibitor/angiotensin receptor blocker therapy resulted in albuminuria changes that were associated with renal and cardiovascular risk changes. This did not translate into renal or cardiovascular protection because the overall reduction in albuminuria in the aliskiren arm was too small and nearly similar to that in the placebo arm.


Assuntos
Albuminúria/prevenção & controle , Anti-Hipertensivos/uso terapêutico , Doenças Cardiovasculares/prevenção & controle , Diabetes Mellitus Tipo 2/complicações , Hipertensão/tratamento farmacológico , Insuficiência Renal Crônica/prevenção & controle , Renina/antagonistas & inibidores , Idoso , Albuminúria/complicações , Albuminúria/epidemiologia , Amidas/uso terapêutico , Antagonistas de Receptores de Angiotensina/uso terapêutico , Inibidores da Enzima Conversora de Angiotensina/uso terapêutico , Biomarcadores/urina , Doenças Cardiovasculares/complicações , Doenças Cardiovasculares/epidemiologia , Estudos de Coortes , Método Duplo-Cego , Quimioterapia Combinada , Feminino , Seguimentos , Fumaratos/uso terapêutico , Humanos , Hipertensão/complicações , Hipertensão/urina , Masculino , Pessoa de Meia-Idade , Guias de Prática Clínica como Assunto , Insuficiência Renal Crônica/complicações , Insuficiência Renal Crônica/epidemiologia , Fatores de Risco
2.
Diabetologia ; 54(1): 44-50, 2011 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-20882268

RESUMO

AIMS/HYPOTHESIS: To assess the effect of an angiotensin receptor blocker (ARB) on serum potassium and the effect of a serum potassium change on renal outcomes in patients with type 2 diabetes and nephropathy. METHODS: We performed a post hoc analysis in patients with type 2 diabetes participating in the Reduction of Endpoints in NIDDM with the Angiotensin II Antagonist Losartan (RENAAL) study. Renal outcomes were defined as a composite of doubling of serum creatinine or end-stage renal disease. RESULTS: At month 6, 259 (38.4%) and 73 (10.8%) patients in the losartan group and 151 (22.8%) and 34 (5.1%) patients in the placebo group had serum potassium ≥5.0 mmol/l and ≥5.5 mmol/l, (p < 0.001), respectively. Losartan was an independent predictor for serum potassium ≥5.0 mmol/l at month 6 (OR 2.8; 95% CI 2.0-3.9). Serum potassium at month 6 ≥ 5.0 mmol/l was in turn associated with increased risk for renal events (HR 1.22; 95% CI 1.00-1.50), independent of other risk factors. Adjustment of the overall treatment effects for serum potassium augmented losartan's renoprotective effect from 21% (6-34%) to 35% (20-48%), suggesting that the renoprotective effects of losartan are offset by its effect on serum potassium. CONCLUSIONS/INTERPRETATION: In this study, we found that treatment with the ARB losartan is associated with a high risk of increased serum potassium levels, which is in turn associated with an increased risk of renal outcomes in patients with diabetes and nephropathy. Whether additional management of high serum potassium would further increase the renal protective properties of losartan is an important clinical question.


Assuntos
Bloqueadores do Receptor Tipo 1 de Angiotensina II/uso terapêutico , Diabetes Mellitus Tipo 2/tratamento farmacológico , Nefropatias Diabéticas/sangue , Losartan/uso terapêutico , Potássio/sangue , Diabetes Mellitus Tipo 2/sangue , Diabetes Mellitus Tipo 2/fisiopatologia , Nefropatias Diabéticas/fisiopatologia , Feminino , Humanos , Masculino , Pessoa de Meia-Idade
3.
Kidney Int ; 73(11): 1216-9, 2008 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-18322541

RESUMO

Worldwide adoption of the Kidney Disease Outcomes Quality Initiative classification for chronic kidney disease (CKD) and widespread use of the estimated glomerular filtration rate to assess renal function have identified large numbers of patients with previously undiagnosed CKD. It is clear, however, that this is a heterogeneous group and that only a small minority of such patients ever progress to end-stage renal disease. There is thus an urgent need for a simple method of risk assessment that can be applied to all patients with CKD to identify those few at greatest risk. The magnitude of baseline proteinuria has long been recognized as an important predictor of renal prognosis. Furthermore, several studies have found that change in proteinuria after initiation of antihypertensive treatment as well as achieved level of proteinuria correlate with prognosis. Thus, proteinuria has emerged as the single most important marker of renal risk. Many other factors have been identified as risk factors for CKD progression. Several attempts have been made to combine a relatively small number of risk factors into a risk score to predict renal outcomes in specific groups of patients. Validation of these risk scores as well as further studies are now required to develop a renal risk score applicable to a more general population of patients with CKD. Similar methodology could be applied to assess the important issue of the cardiovascular risk associated with CKD.


Assuntos
Nefropatias/diagnóstico , Nefropatias/epidemiologia , Proteinúria/diagnóstico , Biomarcadores , Doença Crônica , Progressão da Doença , Humanos , Prognóstico , Medição de Risco
4.
Kidney Int ; 70(10): 1694-705, 2006 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-16969387

RESUMO

Epidemiological studies have raised awareness of the problem of undiagnosed chronic kidney disease (CKD) and suggest that early identification and treatment will reduce the global burden of patients requiring dialysis. This has highlighted the twin problems of how to identify subjects for screening and target intervention to those with CKD most likely to progress to end-stage renal disease. Prospective studies have identified risk factors for CKD in the general population as well as risk factors for progression in patients with established CKD. Risk factors may thus be divided into initiating factors and perpetuating factors, with some overlap between the groups. In this paper, we review current data regarding CKD risk factors and illustrate how each may impact upon the mechanisms underlying CKD progression to accelerate loss of renal function. We propose that these risk factors should be used as a basis for developing a renal risk score, analogous to the Framingham risk score for ischemic heart disease, which will allow accurate determination of renal risk in the general population and among CKD patients.


Assuntos
Nefropatias/etiologia , Nefropatias/fisiopatologia , Biomarcadores/urina , Doenças Cardiovasculares/etiologia , Doenças Cardiovasculares/fisiopatologia , Doença Crônica , Progressão da Doença , Feminino , Humanos , Nefropatias/diagnóstico , Nefropatias/urina , Falência Renal Crônica/fisiopatologia , Masculino , Prognóstico , Fatores de Risco
5.
Kidney Int ; 69(9): 1675-82, 2006 May.
Artigo em Inglês | MEDLINE | ID: mdl-16572114

RESUMO

Type 2 diabetes is becoming the leading cause of end-stage renal disease (ESRD) worldwide. Prevalence of ESRD and the antihypertensive response to renin-angiotensin system intervention are suggested to vary among different ethnicities. The Reduction in Endpoints in Non-insulin dependent diabetes mellitus with the Angiotensin II Antagonist Losartan (RENAAL) study, which included different ethnic groups, demonstrated a renoprotective effect of losartan. A post hoc analysis from RENAAL was performed where we examined in each ethnic group the ESRD risk, identified independent predictors for ESRD, effect of degree of baseline albuminuria, effect of 6-month antiproteinuric response to therapy on ESRD, and renoprotective effect of losartan assessed by albuminuria reduction and ESRD. Baseline albuminuria was the strongest predictor for ESRD in every ethnic group. Albuminuria reduction was associated with reduced risk of ESRD while losartan reduced albuminuria in every ethnic group. When accounting for independent predictors of ESRD, losartan exhibited renoprotection in all ethnic groups. In this type 2 diabetic population with nephropathy, baseline albuminuria is the predominant risk parameter for ESRD; early antiproteinuric effect of losartan predicts long-term renoprotection; and losartan appears to be renoprotective in all ethnic groups. Since the RENAAL study was not powered to determine ethnic responses, these results underline the need for prospective trials where the aim is renal protection among different ethnic groups.


Assuntos
Diabetes Mellitus Tipo 2/epidemiologia , Nefropatias Diabéticas/epidemiologia , Etnicidade , Falência Renal Crônica/epidemiologia , Falência Renal Crônica/prevenção & controle , Albuminúria/diagnóstico , Albuminúria/tratamento farmacológico , Inibidores da Enzima Conversora de Angiotensina/uso terapêutico , Anti-Hipertensivos/uso terapêutico , Feminino , Humanos , Losartan/uso terapêutico , Masculino , Prognóstico , Risco
6.
Kidney Int ; 69(1): 22-8, 2006 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-16374419

RESUMO

Since the terms 'hypertension' and 'microalbuminuria' were first defined, data from numerous studies have documented the continuous, rather than dichotomous, relation between blood pressure, albumin excretion, and cardiovascular disease. Lower blood pressures, down to at least 115/75 mmHg, and lower albumin excretions, below an estimated 2 mg/day, are associated with less cardiovascular risk. We hypothesize that the abundances of modern civilization superimposed on the Paleolithic genotype of humans, which has not substantially changed in the last 10 000 years, have considerably shifted the 'normal' values for blood pressure and various biochemical indices such as albuminuria still found in today's stone-aged cultures to the 'neo-normal' values observed today in the rest of the modern world. Defining a large portion of the population as 'normal' based upon these dichotomous 'neo-normal' standards is not supported by the data, and therefore seems unjustifiable. We propose that the medical community consider abandoning the terms 'hypertension' and 'microalbuminuria' in favor of 'blood pressure-associated' and 'albuminuria-associated' disease.


Assuntos
Albuminúria/complicações , Doenças Cardiovasculares/etiologia , Hipertensão/complicações , Pressão Sanguínea , Doenças Cardiovasculares/prevenção & controle , LDL-Colesterol/sangue , Humanos
7.
Diabetologia ; 48(10): 1980-7, 2005 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-16082528

RESUMO

AIMS/HYPOTHESIS: We explored the impact of baseline left ventricular hypertrophy (LVH) and losartan treatment on renal and cardiovascular (CV) events in 1,513 patients from the Reduction of Endpoints in NIDDM with the Angiotensin II Antagonist Losartan (RENAAL) trial, which studied the effects of losartan on the progression of renal disease and/or death in patients with type 2 diabetes and nephropathy. MATERIALS AND METHODS: LVH was assessed using ECG criteria (Cornell product and/or Sokolow-Lyon voltage). The risk of renal or CV events was determined by a proportional hazards model fit with treatment allocation and presence of LVH. Covariates at baseline included age, sex, systolic BP, mean arterial pressure, pulse, proteinuria, serum creatinine, albumin and haemoglobin. RESULTS: A total of 187 subjects (12%) had LVH at baseline. Treatment with losartan resulted in a significant decrease in the Cornell product (-6.2%) and Sokolow-Lyon voltage (-6.3%). LVH was shown to be significantly associated with the primary endpoint, which was a composite of doubling of serum creatinine (DSCR), endstage renal disease (ESRD) or death (hazard ratio [HR]=1.44, p=0.011), as well as with the composite renal endpoint of DSCR/ESRD (HR=1.42, p=0.031) and CV events (HR=1.68, p=0.001). Losartan treatment of patients with LVH decreased the CV as well as renal risk to a level similar to that of patients without LVH. CONCLUSIONS/INTERPRETATION: In patients with type 2 diabetes and nephropathy, LVH is associated with significantly increased risk of CV events and the progression of kidney disease. Importantly, in patients with LVH, losartan reduced the CV as well as the renal risk to a level similar to that seen in subjects without LVH.


Assuntos
Anti-Hipertensivos/uso terapêutico , Complicações do Diabetes/prevenção & controle , Diabetes Mellitus Tipo 2/complicações , Diabetes Mellitus Tipo 2/tratamento farmacológico , Hipertrofia Ventricular Esquerda/prevenção & controle , Losartan/uso terapêutico , Idoso , Angiotensina II/antagonistas & inibidores , Doenças Cardiovasculares/prevenção & controle , Nefropatias Diabéticas/prevenção & controle , Método Duplo-Cego , Eletrocardiografia , Determinação de Ponto Final , Feminino , Humanos , Hipertrofia Ventricular Esquerda/etiologia , Hipertrofia Ventricular Esquerda/fisiopatologia , Masculino , Pessoa de Meia-Idade , Medição de Risco , Resultado do Tratamento
8.
QJM ; 98(2): 119-26, 2005 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-15655096

RESUMO

BACKGROUND: Retinopathy is the clinical hallmark of generalized microangiopathy in diabetes. AIM: To examine the relation of this abnormality to end-stage renal disease (ESRD) and death in type 2 diabetes. DESIGN: Retrospective analysis. METHODS: Of 1513 type 2 diabetic patients with nephropathy participating in the Reduction of Endpoints in NIDDM with the Angiotensin II Antagonist Losartan (RENAAL) study, 1456 (96.5%) were assessed at baseline by ophthalmoscopy or fundus photography. RENAAL was a multinational double masked, randomized, placebo-controlled intervention study, whose primary end-point was the composite of a doubling of the baseline serum creatinine concentration, end-stage renal disease (ESRD) or death. RESULTS: Of those assessed at baseline, 65% had diabetic retinopathy. Patients with retinopathy had higher systolic blood pressure, albuminuria and lower glomerular filtration rate (GFR), haemoglobin and serum albumin values than those without. In univariate analyses, the presence of retinopathy was associated with a 44% increase in the primary composite end-point (hazard ratio 1.44, 95%CI 1.22-1.70, p < 0.001). Patients with retinopathy had a 52% increase in doubling of serum creatinine (p < 0.001), a 47% increased risk of ESRD (p = 0.002) and a 33% increase in risk of death (p = 0.026) compared to those without. In multivariate analyses, the presence of retinopathy was associated with a 23% increase (p = 0.015) in the primary composite end-point and a 22% increase in ESRD or death (p = 0.038). DISCUSSION: The presence of diabetic retinopathy at baseline is associated with more proteinuria, lower GFR, and a higher risk for ESRD and death in type 2 diabetic patients.


Assuntos
Diabetes Mellitus Tipo 2/complicações , Retinopatia Diabética/complicações , Falência Renal Crônica/complicações , Albuminúria/complicações , Pressão Sanguínea/fisiologia , Creatinina/sangue , Diabetes Mellitus Tipo 2/mortalidade , Retinopatia Diabética/mortalidade , Feminino , Taxa de Filtração Glomerular , Hemoglobinas/análise , Humanos , Falência Renal Crônica/mortalidade , Masculino , Pessoa de Meia-Idade , Proteinúria/complicações , Estudos Retrospectivos , Fatores de Risco , Albumina Sérica/análise
9.
Am J Kidney Dis ; 38(6): 1365-71, 2001 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-11728976

RESUMO

A rapid global increase in the number of patients requiring renal replacement therapy necessitates that effective strategies for renal protection are developed and applied widely. We review the experimental and clinical evidence in support of individual renoprotective interventions, including angiotensin-converting enzyme therapy, control of systemic hypertension, dietary protein restriction, reduction of proteinuria, treatment of hyperlipidemia, and smoking cessation. We also consider potential future renoprotective therapies. To achieve maximal renal protection, a comprehensive strategy employing all of these elements is required. This strategy should be directed at normalizing clinical markers of renal disease to induce a state of remission.


Assuntos
Hiperlipidemias/terapia , Hipertensão/tratamento farmacológico , Nefropatias/terapia , Proteinúria/prevenção & controle , Inibidores da Enzima Conversora de Angiotensina/uso terapêutico , Animais , Doença Crônica , Diabetes Mellitus Tipo 1/complicações , Proteínas Alimentares/administração & dosagem , Progressão da Doença , Humanos , Hiperlipidemias/complicações , Hipertensão/complicações , Nefropatias/complicações , Proteinúria/complicações , Indução de Remissão , Abandono do Hábito de Fumar
10.
Bioessays ; 23(11): 1037-46, 2001 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-11746220

RESUMO

The genome is a stable repository of vastly intricate genetic information developed over eons of evolution; this information is replicated at the highest fidelity and expressed within each cell at the highest selectivity. Non-leukemia cancers break this standard; the intricate genetic information qualitatively and progressively deteriorates, resulting in a somatic Darwinian free-for-all. In a process lasting several years, a genomically heterogeneous population replicates from a single cell that originally lost the ability to preserve its genomic integrity. Cells selected for their abilities to proliferate and spread, while evading host defenses, inexorably expand their numbers. The clinical consequences of this become severe, as the genomically diverse cell population that evolves contains members that can evade most therapeutic approaches aimed at "the tumor cell".


Assuntos
Evolução Molecular , Neoplasias/genética , Animais , Humanos , Neoplasias/terapia
11.
Curr Opin Nephrol Hypertens ; 10(6): 727-38, 2001 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-11706299

RESUMO

Although considerable improvement in the prognosis of diabetic nephropathy has been achieved in recent years due to intensive insulin and angiotensin-converting enzyme inhibitor treatment, these approaches do not provide complete protection against progression of diabetic nephropathy. An urgent need for additional novel therapies to prevent or further slow the progression of diabetic nephropathy motivated us to provide an up-to-date review with particular emphasis on the potential role of two growth factors--transforming growth factor-beta and connective tissue growth factor--in the pathogenesis of diabetic nephropathy. The most intensively studied to date, transforming growth factor-beta appears to play a central role in the pathogenesis of diabetic nephropathy. Recently, attention has focused on connective tissue growth factor, which mimics the biological activity of transforming growth factor-beta in profibrotic tissue formation. Thus, acting as a downstream mediator of the profibrotic activity of transforming growth factor-beta, connective tissue growth factor may constitute a more specific target for future antifibrotic therapies.


Assuntos
Proteínas de Transporte/fisiologia , Nefropatias Diabéticas/etiologia , Substâncias de Crescimento/fisiologia , Proteínas Imediatamente Precoces/fisiologia , Peptídeos e Proteínas de Sinalização Intercelular , Fator de Crescimento Transformador beta/fisiologia , Fator de Crescimento do Tecido Conjuntivo , Humanos
12.
Cancer Res ; 61(22): 8274-83, 2001 Nov 15.
Artigo em Inglês | MEDLINE | ID: mdl-11719460

RESUMO

We have used genome-wide allelotyping with 348 polymorphic autosomal markers spaced, on average, 10 cM apart to quantitate the extent of intrachromosomal instability in 59 human sporadic colorectal carcinomas. We have compared instability measured by this method with that measured by inter-(simple sequence repeat) PCR and microsatellite instability assays. Instability quantitated by fractional allelic loss rates was found to be independent of that detected by microsatellite instability analyses but was weakly associated with that measured by inter-(simple sequence repeat) PCR. A set of seven loci were identified that were most strongly associated with elevated rates of fractional allelic loss and/or inter-(simple sequence repeat) PCR instability; these seven loci were on chromosomes 3, 8, 11, 13, 14, 18, and 20. A lesser association was seen with two loci flanking p53 on chromosome 17. Coordinate loss patterns for these loci suggest that at least two separate sets of cooperating loci exist for intrachromosomal genomic instability in human colorectal cancer.


Assuntos
Aberrações Cromossômicas , Neoplasias Colorretais/genética , Perda de Heterozigosidade , Repetições de Microssatélites/genética , Alelos , Genoma Humano , Humanos , Reação em Cadeia da Polimerase/métodos
13.
Ugeskr Laeger ; 163(40): 5514-9, 2001 Oct 01.
Artigo em Dinamarquês | MEDLINE | ID: mdl-11601117

RESUMO

INTRODUCTION: Diabetic nephropathy is the leading cause of end-stage renal disease. Interruption of the renin-angiotensin system slows the progression of renal disease in type 1 diabetic patients, but similar data are not available for type 2, the most common form of diabetes. We assessed the role of the angiotensin II receptor antagonist, losartan, in type 2 diabetic patients with nephropathy. MATERIAL AND METHODS: One thousand five hundred and thirteen patients were enrolled in this randomised, placebo-controlled study of losartan (50 to 100 mg, once daily) or placebo, in addition to conventional antihypertensive treatment (calcium antagonists, diuretics, alpha- and beta-blockers, centrally acting agents) for a mean of 3.4 years. The primary outcome was the composite of doubling of baseline serum creatinine, end-stage renal disease, or death. Secondary end points included a composite of cardiovascular morbidity and mortality, proteinuria, and the progression rate of renal disease. RESULTS: Baseline demographics in the two groups were similar. Three hundred and twenty-seven patients receiving losartan reached the primary end point, as compared with 359 on placebo (risk reduction = 16 per cent, p = 0.02). Losartan reduced the incidence of doubling of serum creatinine (risk reduction = 25 per cent, p = 0.006) and end-stage renal disease (risk reduction = 28 per cent, p = 0.002), but had no effect on death. Benefits exceeded that attributable to changes in blood pressure. The composite of cardiovascular morbidity and mortality was similar in the two groups, except hospitalisation for heart failure, which was reduced with losartan (risk reduction = 32 per cent, p = 0.005). Proteinuria declined by 35 per cent with losartan (p < 0.001). DISCUSSION: Losartan conferred significant renal benefits in type 2 diabetic patients with nephropathy and was generally well tolerated.


Assuntos
Angiotensina II/antagonistas & inibidores , Anti-Hipertensivos/administração & dosagem , Doenças Cardiovasculares/tratamento farmacológico , Diabetes Mellitus Tipo 2/complicações , Angiopatias Diabéticas/tratamento farmacológico , Nefropatias Diabéticas/tratamento farmacológico , Losartan/administração & dosagem , Adulto , Idoso , Doenças Cardiovasculares/etiologia , Doenças Cardiovasculares/prevenção & controle , Diabetes Mellitus Tipo 2/tratamento farmacológico , Angiopatias Diabéticas/etiologia , Angiopatias Diabéticas/prevenção & controle , Nefropatias Diabéticas/etiologia , Nefropatias Diabéticas/prevenção & controle , Método Duplo-Cego , Humanos , Masculino , Pessoa de Meia-Idade , Sistema Renina-Angiotensina/efeitos dos fármacos
14.
Transplantation ; 72(4): 726-9, 2001 Aug 27.
Artigo em Inglês | MEDLINE | ID: mdl-11544438

RESUMO

BACKGROUND: Polymorphism of the genes associated with angiotensin, including angiotensin-converting enzyme (ACE), angiotensinogen (AGT), and the type 1 (AT1) and type 2 (AT2) angiotensin II receptors, has been implicated in the pathophysiology of hypertension, ischemic heart disease, and progression of chronic renal disease. METHODS: We investigated the impact of the ACE, AGT, AT1, and AT2 genotypes on renal allograft function in 148 patients (77 men, 71 women) who underwent transplantation over a 5-year period. Patients were genotyped using polymerase chain reaction sequence-specific primers and polymerase chain reaction followed by restriction fragment length polymorphism analysis. RESULTS: ACE (D) and AGT (A/A) genotypes were associated with poorer chronic renal transplant function and more rapid chronic progression, defined as an increase of serum creatinine level with time. In addition, mean diastolic blood pressure at 3 years was significantly (P<0.02) correlated with C gene dose of AT1 (A-->C, 1166), with levels of 79+/-10 mmHg, 82+/-8.6 mmHg, and 95+/-8.3 mmHg for the A/A, A/C, and C/C genotypes, respectively. An apparent AT2 homozygote disadvantage could be an epiphenomenon because AT2 maps to the X chromosome, and males are homozygous for just one of the AT2 alleles (A/- or G/-). CONCLUSIONS: Pretransplantation testing of the ACE, AGT, and AT1 genotypes may assist clinicians in identifying patients at risk for chronic renal transplant dysfunction and hypertension.


Assuntos
Angiotensinas/genética , Hipertensão/etiologia , Hipertensão/genética , Nefropatias/etiologia , Nefropatias/genética , Transplante de Rim/efeitos adversos , Polimorfismo Genético , Adulto , Idoso , Pressão Sanguínea , Estudos Transversais , Feminino , Humanos , Hipertensão/fisiopatologia , Rim/fisiopatologia , Masculino , Pessoa de Meia-Idade , Fatores de Risco , Doadores de Tecidos
15.
N Engl J Med ; 345(12): 861-9, 2001 Sep 20.
Artigo em Inglês | MEDLINE | ID: mdl-11565518

RESUMO

BACKGROUND: Diabetic nephropathy is the leading cause of end-stage renal disease. Interruption of the renin-angiotensin system slows the progression of renal disease in patients with type 1 diabetes, but similar data are not available for patients with type 2, the most common form of diabetes. We assessed the role of the angiotensin-II-receptor antagonist losartan in patients with type 2 diabetes and nephropathy. METHODS: A total of 1513 patients were enrolled in this randomized, double-blind study comparing losartan (50 to 100 mg once daily) with placebo, both taken in addition to conventional antihypertensive treatment (calcium-channel antagonists, diuretics, alpha-blockers, beta-blockers, and centrally acting agents), for a mean of 3.4 years. The primary outcome was the composite of a doubling of the base-line serum creatinine concentration, end-stage renal disease, or death. Secondary end points included a composite of morbidity and mortality from cardiovascular causes, proteinuria, and the rate of progression of renal disease. RESULTS: A total of 327 patients in the losartan group reached the primary end point, as compared with 359 in the placebo group (risk reduction, 16 percent; P=0.02). Losartan reduced the incidence of a doubling of the serum creatinine concentration (risk reduction, 25 percent; P=0.006) and end-stage renal disease (risk reduction, 28 percent; P=0.002) but had no effect on the rate of death. The benefit exceeded that attributable to changes in blood pressure. The composite of morbidity and mortality from cardiovascular causes was similar in the two groups, although the rate of first hospitalization for heart failure was significantly lower with losartan (risk reduction, 32 percent; P=0.005). The level of proteinuria declined by 35 percent with losartan (P<0.001 for the comparison with placebo). CONCLUSIONS: Losartan conferred significant renal benefits in patients with type 2 diabetes and nephropathy, and it was generally well tolerated.


Assuntos
Antagonistas de Receptores de Angiotensina , Anti-Hipertensivos/uso terapêutico , Doenças Cardiovasculares/mortalidade , Diabetes Mellitus Tipo 2/complicações , Nefropatias Diabéticas/tratamento farmacológico , Falência Renal Crônica/prevenção & controle , Losartan/uso terapêutico , Adulto , Idoso , Doenças Cardiovasculares/epidemiologia , Creatina/sangue , Creatinina/sangue , Nefropatias Diabéticas/complicações , Progressão da Doença , Método Duplo-Cego , Feminino , Humanos , Hipertensão/complicações , Hipertensão/tratamento farmacológico , Masculino , Pessoa de Meia-Idade , Proteinúria/prevenção & controle
16.
Curr Opin Nephrol Hypertens ; 10(4): 523-31, 2001 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-11458034

RESUMO

Experimental and clinical studies over the past two decades have identified several interventions for slowing the progression of chronic renal disease towards end-stage renal failure. In this paper we review the experimental and clinical evidence in support of dietary protein restriction, angiotensin-converting enzyme inhibitor therapy, control of systemic hypertension, reduction of proteinuria, treatment of hyperlipidemia and smoking cessation. We also consider potential future renoprotective therapies. Finally we propose a comprehensive strategy for achieving maximal renoprotection with available interventions and monitoring.


Assuntos
Falência Renal Crônica/terapia , Antagonistas de Receptores de Angiotensina , Inibidores da Enzima Conversora de Angiotensina/uso terapêutico , Animais , Anti-Inflamatórios/uso terapêutico , Dieta com Restrição de Proteínas , Humanos , Hiperlipidemias/terapia , Hipertensão/tratamento farmacológico , Falência Renal Crônica/etiologia , Falência Renal Crônica/prevenção & controle , Neprilisina/antagonistas & inibidores , Proteinúria/terapia , Abandono do Hábito de Fumar
17.
Ann Intern Med ; 135(2): 73-87, 2001 Jul 17.
Artigo em Inglês | MEDLINE | ID: mdl-11453706

RESUMO

PURPOSE: To examine the efficacy of ACE inhibitors for treatment of nondiabetic renal disease. DATA SOURCES: 11 randomized, controlled trials comparing the efficacy of antihypertensive regimens including ACE inhibitors to the efficacy of regimens without ACE inhibitors in predominantly nondiabetic renal disease. STUDY SELECTION: Studies were identified by searching the MEDLINE database for English-language studies evaluating the effects of ACE inhibitors on renal disease in humans between May 1977 (when ACE inhibitors were approved for trials in humans) and September 1997. DATA EXTRACTION: Data on 1860 nondiabetic patients were analyzed. DATA SYNTHESIS: Mean duration of follow-up was 2.2 years. Patients in the ACE inhibitor group had a greater mean decrease in systolic and diastolic blood pressure (4.5 mm Hg [95% CI, 3.0 to 6.1 mm Hg]) and 2.3 mm Hg [CI, 1.4 to 3.2 mm Hg], respectively) and urinary protein excretion (0.46 g/d [CI, 0.33 to 0.59 g/d]). After adjustment for patient and study characteristics at baseline and changes in systolic blood pressure and urinary protein excretion during follow-up, relative risks in the ACE inhibitor group were 0.69 (CI, 0.51 to 0.94) for end-stage renal disease and 0.70 (CI, 0.55 to 0.88) for the combined outcome of doubling of the baseline serum creatinine concentration or end-stage renal disease. Patients with greater urinary protein excretion at baseline benefited more from ACE inhibitor therapy (P = 0.03 and P = 0.001, respectively), but the data were inconclusive as to whether the benefit extended to patients with baseline urinary protein excretion less than 0.5 g/d. CONCLUSION: Antihypertensive regimens that include ACE inhibitors are more effective than regimens without ACE inhibitors in slowing the progression of nondiabetic renal disease. The beneficial effect of ACE inhibitors is mediated by factors in addition to decreasing blood pressure and urinary protein excretion and is greater in patients with proteinuria. Angiotensin-converting inhibitors are indicated for treatment of nondiabetic patients with chronic renal disease and proteinuria and, possibly, those without proteinuria.


Assuntos
Inibidores da Enzima Conversora de Angiotensina/uso terapêutico , Anti-Hipertensivos/uso terapêutico , Nefropatias/tratamento farmacológico , Creatinina/sangue , Diabetes Mellitus , Progressão da Doença , Seguimentos , Humanos , Hipertensão/complicações , Hipertensão/tratamento farmacológico , Nefropatias/complicações , Nefropatias/metabolismo , Falência Renal Crônica/prevenção & controle , Modelos Logísticos , Modelos de Riscos Proporcionais , Proteinúria/tratamento farmacológico , Ensaios Clínicos Controlados Aleatórios como Assunto , Sensibilidade e Especificidade , Resultado do Tratamento
18.
Nephron ; 88(3): 254-9, 2001 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-11423757

RESUMO

Regardless of the pattern of renal involvement, increased urinary protein excretion rate is the best independent predictor of progression of chronic nephropathies and short-term reduction in proteinuria has been reported to be renoprotective in the long term. Despite such evidence, however, the therapeutic target in renoprotection is almost exclusively on blood pressure control. We report the clinical course of a patient with chronic nephropathy after the institution of a multidrug treatment titrated against urinary protein excretion to achieve renoprotection. The present findings indicate that adjusting renoprotective therapy according to the decline in protein excretion in a multidrug strategy may stabilize or even reverse renal disease progression. This approach should be formally explored in prospective studies.


Assuntos
Nefropatias/tratamento farmacológico , Proteinúria/tratamento farmacológico , Adulto , Algoritmos , Antagonistas de Receptores de Angiotensina , Inibidores da Enzima Conversora de Angiotensina/administração & dosagem , Diuréticos , Quimioterapia Combinada , Enalapril/administração & dosagem , Feminino , Humanos , Hidroclorotiazida/administração & dosagem , Nefropatias/patologia , Falência Renal Crônica/tratamento farmacológico , Losartan/administração & dosagem , Nefrite Lúpica/tratamento farmacológico , Nefrite Lúpica/patologia , Inibidores de Simportadores de Cloreto de Sódio/administração & dosagem
19.
Am J Physiol Renal Physiol ; 280(2): F343-55, 2001 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-11208610

RESUMO

Potential determinants of chronic renal disease (CRD) progression were studied in male Munich-Wistar rats subjected to 5/6 nephrectomy and treated with candesartan (Csn; n = 30) or enalapril (Ena; n = 27) from 5 wk postsurgery. Despite control of systolic blood pressure (SBP; 24 wk: Csn = 143 +/- 9; Ena = 148 +/- 8 mmHg), urinary protein excretion rates (U(pr)V) increased over 24 wk (Csn = 92 +/- 10; Ena = 99 +/- 8mg/day). Glomerulosclerosis scores (GS) at 24 wk were similar for Csn (42 +/- 7%) vs. Ena (42 +/- 4%), values close to those of untreated controls at 12 wk (43 +/- 4%). At 24 wk, SBP and UprV correlated strongly with GS, together accounting for 72% of the variance in GS. Renal cortex mRNA levels (determined by competitive RT-PCR) for transforming growth factor (TGF)-beta1 and monocyte chemoattractant protein (MCP)-1 were elevated in Csn and Ena at 12 wk and remained higher at 24 wk vs. sham. Strong correlations were evident among TGF-beta1, MCP-1, and interleukin-1beta and renal injury at 24 wk. Cns and Ena are thus equally effective renoprotective agents in this model. During renin-angiotensin system inhibition, renoprotection is dependent on control of both SBP and UprV. Incomplete suppression of renal cytokine gene expression may also contribute to CRD progression.


Assuntos
Anti-Hipertensivos/farmacologia , Benzimidazóis/farmacologia , Enalapril/farmacologia , Córtex Renal/efeitos dos fármacos , Falência Renal Crônica/metabolismo , Proteinúria/metabolismo , Sistema Renina-Angiotensina/efeitos dos fármacos , Tetrazóis/farmacologia , Animais , Compostos de Bifenilo , Pressão Sanguínea/efeitos dos fármacos , Pressão Sanguínea/fisiologia , Quimiocina CCL2/metabolismo , Endotelina-1/efeitos dos fármacos , Endotelina-1/metabolismo , Interleucina-1/metabolismo , Córtex Renal/metabolismo , Masculino , Nefrectomia , RNA Mensageiro/efeitos dos fármacos , RNA Mensageiro/metabolismo , Ratos , Ratos Wistar , Sistema Renina-Angiotensina/fisiologia , Fator de Crescimento Transformador beta/efeitos dos fármacos , Fator de Crescimento Transformador beta/metabolismo , Fator de Crescimento Transformador beta1
20.
Am J Kidney Dis ; 37(1 Suppl 2): S48-53, 2001 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-11158861

RESUMO

The 3-hydroxy-3-methylglutaryl coenzyme A reductase inhibitor (statin)-mediated lowering of serum cholesterol has been associated with a significant reduction in cardiovascular morbidity and mortality. Recent studies suggest that additional non-lipid lowering effects (eg, endothelial stabilization, anti-inflammatory, antithrombogenic) may be important in modulating their effectiveness. Dyslipidemia is common in end-stage renal disease (ESRD), and hemodialysis patients have increased cardiovascular morbidity and mortality. Cerivastatin, a new statin with powerful low-density lipoprotein-cholesterol (LDL-C) lowering capabilities, possesses some unique non-LDL-C-mediated properties that may contribute to a reduction of coronary events in the patient with ESRD. The primary objective of this multicenter multinational study of 1,054 hemodialysis patients is to compare 2 years of treatment with cerivastatin (0.4 mg/d) versus placebo on the composite clinical event rate of myocardial infarction, sudden cardiac death, ischemic stroke, and the need for coronary arterial bypass graft (CABG) or percutaneous transluminal coronary angioplasty (PTCA) procedures in these patients. Changes in lipids, inflammatory proteins including heat stable C-reactive protein (hsCRP), interleukin-6 (IL-6), oncostatin-M, intracellular adhesion molecule-1 (ICAM-1) and monocyte-chemoattractant protein-1 (MCP-1), as well as markers of cardiac muscle pathology, such as troponin I and troponin T, will be assessed in a subset of patients. This study is the first of its kind to assess the effect of a statin on the reduction of cardiovascular morbidity and mortality in an incident hemodialysis population. It will determine whether treatment with cerivastatin can effectively reduce the significant cardiovascular morbidity and mortality.


Assuntos
Inibidores de Hidroximetilglutaril-CoA Redutases/uso terapêutico , Falência Renal Crônica/tratamento farmacológico , Piridinas/uso terapêutico , Adulto , Idoso , Idoso de 80 Anos ou mais , Área Sob a Curva , Método Duplo-Cego , Feminino , Seguimentos , Coração/efeitos dos fármacos , Coração/fisiopatologia , Humanos , Falência Renal Crônica/metabolismo , Falência Renal Crônica/terapia , Masculino , Pessoa de Meia-Idade , Estudos Multicêntricos como Assunto , Piridinas/farmacocinética , Ensaios Clínicos Controlados Aleatórios como Assunto , Diálise Renal , Projetos de Pesquisa , Análise de Sobrevida
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