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[Renal tubular acidosis (type 2) in a Friesian mare].

A 2-year-old Friesian mare was examined because she had been sluggish for a few weeks. Blood biochemistry showed that concentrations of creatinine (136 mumol.L-1) and urea nitrogen (6.1 mmol.L-1) in plasma were within their normal limits. Severe metabolic acidosis was apparent; the venous pH was 7.154 and the bicarbonate concentration was 13 mmol.L-1. The base excess amounted to -15.3 mmol.L-1 and the venous pCO2 measured 5.1 kPa. Plasma sodium was normal (135 mmol.L-1) and plasma chloride (113 mmol.L-1) was slightly elevated, but there was a hypokalaemia (2.9 mmol.L-1). The urine had a specific gravity of 1.040 and a pH of 5. These findings indicated type 2 renal tubular acidosis. The blood values returned to normal 3 days after treatment with sodium bicarbonate as a 4.2 per cent solution (3.2 mol in total) and additional bicarbonate (125 g) and potassium chloride (100 g) administered orally.