[The serum and tissue concentrations of antibiotics used in pediatric pulmonology]

Measurements were made of the concentrations of different antibiotics in children with acute and chronic pneumonia. The data obtained do not only confirm the dependence of the peak concentration of the drug in blood serum and tissue fluid on the antibiotic single dose but also point to a direct relationship between the single dose and duration of a high drug concentration in the body. It has been established that parenteral drugs penetrate well the pleural cavity, making it inadvisable to administer antibiotics intrapleurally in the treatment of acute pneumonias complicated by exudative pleurisy. In chronic pneumonia, the maximal content of antibiotic in pulmonary tissue reaches 30% of its serum concentration 2.5-3 hours after a single intramuscular drug injection. Study of the pharmacokinetics of antibiotics administered per os in the treatment of acute pneumonia attests to their rapid absorption from the gastrointestinal tract; as a rule, the peak concentrations were recorded 1 hour after the drug intake and exceeded many times the minimum inhibitory concentration for pneumococci isolated from the patients placed under observation.