[Study of pulmonary leucostasis by measurement of the alveolo-arterial CO2 difference (author's transl)].

In order to study pulmonary leucostasis in 18 leukemic subjects, the ventilatory flow from ventilated nonperfused zones (VFVNZ) was measured using alveolo-arterial CO2 difference (28 times). This method proved to be simple and accurate in the follow-up of the patients. The number of white cells necessary to increase the VFVNZ by 1% is very different from one histologic type to another. These results are in agreement with in vitro observations.