We investigated the effect of administration of NaHCO
3 into patients with metabolic acidosis and the experimentally produce acidotic rats on the acid-base balance both in extra and intracellular space of the skeletal muscle.
1) The distribution space of the infused HCO
3- was estimated as 40% of the body weight, using the following formulae HCO
3 needed=Base Excess×Body weight×0.4. However, in severe acidosis a larger distribution space should preferably be used.
2) The change in the distribution space of intused HCO
3- was well correlated with decreases of both plasma HCO
3- and muscle cell pH.
3) Rapid correction of metabolic acidosis with NaHCO
3 occasionally results in an aggravation of intracellular acidosis of the muscle.
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