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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Persistent and transient distal renal tubular acidosis with bicarbonate wasting.

Bicarbonate titration studies were performed on two patients with bicarbonate wasting distal renal tubular acidosis ( RTA; patients 1 and 2) and on three patients (3,4, and 5) with classic distal RTA. Daily requirements of alkali were 4.5 mEq/kg body wt in patient 1, a 3-year-old boy, and 16 mEq/kg in patient 2, a 5-month-old male infant. In contrast, only 1.5-2 mEq/kg/24 hr alkali were required in the three patients with classic distal RTA (age 8 1/2- 22 years). Patient 1 had glucose-6-phosphate dehydrogenase deficiency and patient 3 had inner ear deafness as an associated anomaly. In patient 2, the acidification defect was transient. Mean fractional excretion of bicarbonate (ChCO3-/Cin) times 100 at a plasma concentration of HCO3 below 20 mmol/liter was 5.1% in patient 1, 11.6% in patient 2, and 1.7% in patients 3-5. Minimal urine pH during the study was 7.38 in patient 1, 7.66 in patient 2, and 6.78-6.97 in the other patients. Values of net acid excretion at plasma HCO3 = 16 mmol/liter were strongly negative in patients 1 and 2 (-75 and -195 mumol/100 ml glomerular filtrate (GF), respectively) but slightly positive in the three patients with classic RTA (+3 to +20 mumol/100 ml GF). The two patients with bicarbonate wasting distal RTA were thus clearly separated from the group of patients with classic distal RTA.[1]


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