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At least 631 records · Page 35Linked to original sources
PubMed2005

[Hypercalciuria].

The frequency of hypercalciuria is increasing in western countries with an incidence of nephrolithiasis which can reach 13%. Hypercalciuria appears as an alteration of the calcium transport system (kidney, bowel, bone) which is regulated by calcitriol and parathormone. The aim of this review was to screen etiologies of hypercalciuria taking into account recent genetic advances (calcium epithelial channel and calcium sensing receptor). Hypercalciuria may be favored by nutritional causes (diet rich in calcium, sodium, carbohydrates, proteins, poor in phosphates and potassium). It may also be related to an increase in calcium absorption (vitamin D excess, primary hyperparathyroidism, sarcoidosis, lymphoma, estrogens, and certain genetic causes), an increase in osteoresorption (bone metastasis, myeloma, Paget, hyperthyroidism, immobilization, hypercortisolism and corticosteroid therapy), or a decrease of kidney tubular resorption (diuretics, Cacci and Ricci, acromegally, Bartter, familial dominant hypocalcemia, Fanconi, Dent, familial hypomagnesemia-hypercalciuria syndrome, type 1 distal tubular acidosis, pseudohypoaldosteronism, diabetes). If no cause is identified, persistence of hypercalciuria after instituting a correct diet is defined as idiopathic hypercalciuria. Treatment of the cause is essential in secondary hypercalciuria, in addition to diet (low sodium intake, normocalcic diet, hydration), associated with thiazide diuretics and biphosphonates if necessary.

Biological Transport↗
PubMed1983

Lactic acidosis.

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Acidosis↗
PubMed1987

Intestinal mucormycosis in hemodialysis patients following deferoxamine.

Two maintenance hemodialysis patients receiving deferoxamine to chelate iron and aluminum developed intestinal mucormycosis. One patient had pulmonary mucormycosis as well. The patients lacked the usual predisposing factors to mucormycosis, ie, diabetes and acidosis, but both had liver disease. The role of siderophores such as deferoxamine in promoting certain infections is discussed with reference to this particular clinical setting.

Deferoxamine↗
PubMed2002

[Inherited and acquired disorders of mitochondrial DNA].

Human mitochondrial DNA (mtDNA) resides in thousands of copies in each cell and encodes for 13 structural proteins which are subunits of the respiratory chain. Point mutations, deletions, and decreased copy-number (mtDNA-depletion) are now functionally and genetically linked to human disease. Although mtDNA is inherited maternally, some mutations may arise spontaneously and others are inherited in a mendelian fashion, which is attributed to defective nuclear genes. MtDNA-mutations are also associated with aging and with tumors but in these conditions probably not of functional significance. Mutations of mtDNA may be acquired by exposure to toxic substances (such as alcohol or doxorubicin). An acquired copy number defect (mtDNA-depletion) is dose-limiting for some antiviral nucleosides and nucleotide analogues. The internist encounters predominantly myopathies, cardiomyopathies, lactic acidosis or diabetes mellitus but mtDNA-changes also lead to neurological, hematological and renal symptoms. A syndrome of fat redistribution, termed lipodystrophy, is now observed with long-term therapy of HIV-patients and has been associated with mtDNA-depletion. Therapy with vitamins, radical scavengers and L-carnitine is recommended, but of limited success.

Adolescent↗
PubMed2001

Distal renal tubular acidosis with severe hypokalaemia, probably caused by colonic H(+)-K(+)-ATPase deficiency.

We describe a 21 month old male infant who presented with failure to thrive associated with severe hypokalaemia and metabolic acidosis, together with hypomagnesaemia. Evaluation revealed marked renal and probable faecal potassium wasting, distal renal tubular acidosis, mild urinary magnesium wasting, and a normal gastric pH (gastric H(+)-K(+)-ATPase). Hypokalaemic forms of metabolic acidosis, such as diabetic ketoacidosis and proximal renal tubular acidosis were ruled out from the clinical picture. The hypokalaemia of distal renal tubular acidosis usually improves with alkali therapy, but this was not observed: despite correction of acidosis with 5 mmol/kg potassium citrate per day, an additional 5 mmol/kg potassium chloride was required to bring serum potassium to 3.5 mmol/l. At 3 years of age potassium was provided in the absence of potential alkali and acidosis ensued; serum bicarbonate fell to 10 mmol/l. Although a specific genetic analysis is not yet possible, the abnormalities are consistent with a novel form of distal renal tubular acidosis. The pathophysiology probably does not stem from defects in the vacuolar H(+)-ATPase but more likely from deficient activity of the colonic isoform of H(+)-K(+)-ATPase that is resident in the medullary collecting duct and mediates potassium absorption and proton secretion.

Acidosis, Renal Tubular↗
PubMed1979

Differential diagnosis and therapy of hyperketonemic state.

Detection of ketone bodies in the urine or plasma may be used as a rapid, inexpensive diagnostic approach. Understanding the causes of hyperketonemia can lead to identification and appropriate therapy for the underlying cause. At least one urinary ketone measurement should be a routine procedure in all severely ill patients in whom a complete understanding of the underlying pathological processes is not present.

Acidosis↗
PubMed2000

Ketoacidosis accompanied by epileptic seizures in a patient with diabetes mellitus and mitochondrial myopathy, encephalopathy, lactic acidosis and stroke-like episodes (MELAS).

We herein report a rare case of MELAS (mitochondrial myopathy, encephalopathy, lactic acidosis and stroke-like episodes) and diabetes mellitus with ketoacidosis. An 18-year-old female patient was diagnosed to have diabetes mellitus and insulin therapy was thereafter initiated. At 26 years of age, she was hospitalized for diabetic ketoacidosis, soon followed by a loss of consciousness, left-sided dysmetria, and ataxic speech. MELAS was diagnosed because of the presence of ragged red fibers in a muscle biopsy. At 33 years of age, she was admitted to our hospital because of ketoacidosis and partial status epilepticus. A blood gas examination revealed as follows; arterial pH, 6.88; bicarbonate, 2.1 mmol/l; base excess - 29.8 mmol/l. The serum level of glucose had also increased to 30 mmol/l. The serum levels of lactate and B-hydroxybutyrate were elevated to 11.4 mmol/l and 1,990 micromol/l, respectively. Ketoacidosis improved by fluid replacement and continuous intravenous insulin infusion. A brain MRI demonstrated hyperintensity areas on FLAIR images in the bilateral temporal lobes and the cerebellum. A proton MRS demonstrated the abnormal lactate accumulation in the bilateral temporal and occipital lobes. Since epileptic seizures are rare in patients with diabetic ketoacidosis, such seizures may indicate the existence of MELAS syndrome.

Adult↗