Neutrophil and Monocyte Kinetics in a Case of Cyclic Neutropenia

The kinetics of neutrophilic granulocytes and monocytes were examined simultaneously in a patient suffering from cyclic neutropenia. During the remission phase of the disease the observed kinetic data for both cell types did not deviate significantly from the normal range. At a stage just before the minimal blood granulocyte count was reached, the total blood granulocyte pool was diminished and the granulocyte half disappearance time shortened to 2.3 hr. Moreover, the intravascular granulocyte distribution changed in favor of the marginal granulocyte pool. During the neutropenic phase, the intravascular monocyte pools were Increased and monocyte half-disappearance time was prolonged to 14 hr; the monocyte turnover rate was 2.4-fold higher than during remission.