The partition of 5,5-dimethyloxazolidine-2,4-dione (DMO) and of 11 amines between the vascular and extravascular spaces of the lung has been determined by the multiple indicator dilution technique. Four amines (nicotine, pentylamine, quinine, and benzylamine) were found to have pH-sensitive tissue to blood concentration ratios. Of these, tritiated nicotine appears to be the nost satisfactory indicator of tissue pH and values for the pH of the pulmonary extravascular space (pHe) have been calculated from the nicotine data. At an arterial pH (pHart) between 7.38 and 7.43 pHe averaged 6.69 ±0.07.
Richard M. Effros, Francis P. Chinard
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