Authors study the metabolic evolution of osmolarity, natraemia, chloremia, kaliemia and uremia of 40 infants with hypertonic dehydration. They divide the serie into two groups in accordance with initial value of natraemia: more or less than 170 mEq./l. The slow average decreases by hour of osmolarity, natraemia and chloremia were evaluated, and that justifies good evolution of hypertonic dehydration and minimal neurological repercussion found. Renal function in this metabolic condition is discussed. The usefulness of the fluidotherapic technique employed is demonstrated.
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