Results 191 to 200 of about 690,914 (230)

Dietary calcium, calcium supplements, and the risk of calcium oxalate kidney stones

American Journal of Health-System Pharmacy, 2006
Kidney stones are concentrated masses of crystallized substances, such as calcium, oxalate, or uric acid, that are excreted by the kidneys into the urine. The formation of calcium oxalate stones depends on the level of urinary supersaturation with calcium and oxalate.
Melissa J, Baker, Daniel S, Longyhore
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Conversion of Calcium Oxalate to Calcium Phosphate With Recurrent Stone Episodes

Journal of Urology, 2003
We have extended our previous observation that the percent occurrence of calcium oxalate stones decreased while that of calcium phosphate stones increased with each new stone event.The National VA Crystal Identification Center has analyzed veteran patient urinary tract stones from VA hospitals throughout the United States since 1983.
Neil, Mandel, Ian, Mandel, Kathy, Fryjoff, Tammy, Rejniak, Gretchen, Mandel   +4 more
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Kidney Models of Calcium Oxalate Stone Formation

Nephron Physiology, 2004
This review compares and contrasts three mathematical models used to describe the flow of urine through the renal tubule and the composition of tubular fluid throughout the length of the nephron. From these data the relative supersaturation of tubular fluid with respect to calcium oxalate (CaOx) is calculated at various points along the tubule.
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Oxalate Clearances in Calcium Oxalate Stone Forming Patients

1994
A primary defect in membrane transport of oxalate across red blood cells has been reported in patients with idiopathic renal lithiasis (IRL); corrected by thiazide diuretics (TZ). To assess whether this is reflected in abnormal renal tubular handling of oxalate, we evaluated renal handling of oxalate in normals, patients with RL and primary hyper ...
D. M. Wilson, R. R. Liedtke, L. H. Smith
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Effects of an oxalate load on urinary oxalate excretion in calcium stone formers

Journal of Renal Nutrition, 2003
To investigate the oxalate intake and the effect of an oxalate load on urinary oxalate excretion in calcium stone-forming (CSF) patients.Prospective study.University-affiliated outpatient Renal Lithiasis Unit.Seventy (70) CSF and 41 healthy subjects (HS) collected a 24-hour urine sample and were submitted to a 3-day dietary record to determine mean ...
Claudia, de O G Mendonça, Ligia Araújo, Martini, Alessandra Calábria, Baxmann, José Luiz, Nishiura, Lilian, Cuppari, Dirce Maria, Sigulem, Ita Pfeferman, Heilberg   +6 more
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Oxalate absorption and endogenous oxalate synthesis from ascorbate in calcium oxalate stone formers and non-stone formers

American Journal of Kidney Diseases, 2004
Increased rates of either oxalate absorption or endogenous oxalate synthesis can contribute to hyperoxaluria, a primary risk factor for the formation of calcium oxalate-containing kidney stones. This study involves a comparative assessment of oxalate absorption and endogenous oxalate synthesis in subpopulations of stone formers (SFs) and non-stone ...
Weiwen, Chai, Michael, Liebman, Susan, Kynast-Gales, Linda, Massey   +3 more
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Intestinal Oxalate Absorption in Calcium Oxalate Stone Disease

1981
Several laboratories have reported a slight but significant increase in urinary oxalate excretion in patients with calcium oxalate stone disease1–4. The mechanism responsible for this increased oxalate excretion remains largely unknown. Zarembski and Hodgkinson5, and Robertson et al.1 reported that patients with calcium oxalate stones had a greater ...
J. W. Dobbins, K. Cooper, R. Lang, L. H. Smith, H. J. Binder, A. E. Broadus   +5 more
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Calcium Oxalate Stone Morphology: Fine Tuning our Therapeutic Distinctions

Journal of Urology, 1996
We determined specific radiographic morphological patterns of crystallographically analyzed pure and mixed calcium oxalate dihydrate and calcium oxalate monohydrate urinary calculi.A total of 86 greater than 1 cm. calculi crystallographically analyzed as pure calcium oxalate monohydrate, calcium oxalate dihydrate or admixtures of the 2 types was ...
S P, Dretler, G, Polykoff
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Simulation of calcium oxalate stone in vitro

Science in China Series B, 2003
Crystallization of calcium oxalate is studied mainly in the diluted healthy urine using scanning electron microscopy (SEM), and is compared with the crystallization in the diluted pathological urine. It suggests that the average sizes of calcium oxalate crystals are not in direct proportion to the concentrations of Ca2+ and Ox2- ions.
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Calcium Oxalate Stone Disease in Children

1994
Calcium oxalate nephrolithiasis is a rare disease in children and only a few of these cases have a known etiology. After initial treatment most of these young patients require long term follow-up to remain stone-free. The examination of renal metabolism is necessary with the first stone episode to detect the presence of enzymatic disorders contributing
M. F. Netzer, K. Spelsberg, T. J. Davies
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