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  • 1
    ISSN: 1432-0428
    Keywords: Albuminuria ; risk factors ; blood pressure ; Type 2 (non-insulin-dependent) diabetes mellitus ; Pima Indians
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Blood pressure was measured in 490 non-proteinuric Pima Indians from the Gila River Indian Community in Arizona at least 1 year before the diagnosis of Type 2 (non-insulin-dependent) diabetes mellitus. Urine albumin concentration was measured in the same subjects 0–24 years (mean 5 years) after diabetes was diagnosed. Prevalence rates of abnormal albumin excretion (albumin-to-creatinine ratio ≥100 mg/g) after the onset of Type 2 diabetes were 9%, 16%, and 23%, respectively, for the lowest to highest tertiles of pre-diabetic mean blood pressure. When controlled for age, sex, duration of diabetes and pre-diabetic 2-h post-load plasma glucose concentration, higher pre-diabetic mean blood pressure predicted abnormal urinary excretion of albumin after the onset of diabetes. This finding suggests that the higher blood pressure seen in diabetic nephropathy is not entirely a result of the renal disease, but may precede and contribute to it.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-0428
    Keywords: Diabetic nephropathy ; proteinuria ; end-stage renal disease ; Type 2 (non-insulin-dependent) diabetes mellitus ; blood pressure ; Pima Indians
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary To identify factors related to the development of end-stage renal disease after the onset of proteinuria, its incidence was determined in 364 Pima Indians aged 35 years or older with Type 2 (non-insulin-dependent) diabetes mellitus and proteinuria (protein-to-creatinine ratio ≥0.5 g/g). Of these 364 subjects, 95 (36 men, 59 women) developed end-stage renal disease. The cumulative incidence was 40% 10 years after and 61% 15 years after the onset of proteinuria. The incidence of end-stage renal disease was significantly related to the duration of diabetes, the duration of proteinuria, higher 2-h plasma glucose concentration, type of diabetes treatment, and the presence of retinopathy at the time of recognition of the proteinuria, but not to age, sex, or blood pressure. Duration of proteinuria influenced the risk of end-stage renal disease, contingent, however, upon the duration of diabetes at the onset of proteinuria. The higher cumulative incidence of end-stage renal disease 15 years after the onset of proteinuria in Pima Indians (61 %) than in Caucasians from Rochester, Minnesota (17%) may be attributable, in part, to the younger age of onset of Type 2 diabetes in Pima Indians than in Caucasians, to ethnic differences in susceptibility to renal disease, or to lower death rates among the Pima Indians from competing causes of death, such as coronary heart disease.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1432-0428
    Keywords: Type 2 (non-insulin-dependent) diabetes mellitus ; American Indians ; diabetic renal disease ; genetics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary We studied the occurrence of renal disease by measuring serum creatinine and urine protein concentrations in the diabetic members of 316 Pima Indian families with Type 2 (non-insulin-dependent) diabetes in two successive generations to determine if diabetic renal disease aggregates in families. After adjustment for sex and other risk factors, proteinuria occurred among 14.3% of the diabetic offspring if neither parent had proteinuria, 22.9% if at least one diabetic parent had proteinuria, and 45.9% if both parents had diabetes and proteinuria. Among male offspring, an elevated serum creatinine concentration (≥177 μmol/l) was present in 11.7% if the parent had an elevated creatinine and in 1.5% if the parent did not. Thus, proteinuria and high serum creatinine aggregated in diabetic families, suggesting that susceptibility to renal disease is inherited independently of diabetes.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Cardiovascular drugs and therapy 7 (1993), S. 585-592 
    ISSN: 1573-7241
    Keywords: K+ channel ; IT0 ; delayed rectifier ; antiarrhythmic drugs ; cardiac excitation-contraction coupling
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Action potential duration is an important determinant of refractoriness in cardiac tissue and thus of the ability to propagate electrical impulses. Action potential duration is controlled in part by activation of K+ currents. Block of K+ channels and the resultant prolongation of action potential duration has become an increasingly attractive mode of anti-arrhythmic intervention. Detailed investigation of individual cardiac K+ channels has been hampered by the presence of multiple types of K+ channels in cardiac cells and the difficulty of isolating individual currents. We have approached this problem by employing a combination molecular cloning technology, heterologous channel expression systems, and biophysical analysis of expressed channels. We have focused on six different channels cloned from the rat and human cardiovascular systems. Each channel has unique functional and pharmacological characteristics, and as a group they comprise a series of mammalian K+ channel isoforms that can account for some of the diversity of channels in the mammalian heart. Each channel appears to be encoded by a different gene with little or no evidence for alternate splicing of RNA transcripts to account for the differences in primary amino acid sequence. In addition to the unique kinetic properties of these channel isoforms when expressed as homotetrameric assemblies, the formation of heterotetrameric K+ channels is also observed. The formation of heterotetrameric channels from the different gene products to create new channels with unique kinetic and pharmacological properties might further account for cardiac K+ channel diversity.
    Type of Medium: Electronic Resource
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