Platelet aggregation, pulmonary microcirculation and external respiration were studied against clinical appearance of the disease in 20 patients with aspirin-sensitive asthma (ASA) and 10 asthmatics without aspirin intolerance. All ASA patients were found to exhibit higher intensity and rate of platelet aggregation induced by ATP and heparin. Capillary pulmonary circulation in them was decreased 2-fold compared to nonaspirin asthma patients. All ASA cases had obstructive impairment of pulmonary ventilation in peripheral bronchi. The more serious were defects in platelet function, the more significant were microcirculatory and external respiratory alterations in ASA. Thus, it is evident that changes in platelet function play an important role in the genesis of pulmonary microcirculation and external respiration affections in ASA patients.
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