[Measurement of blood pressure in the pulmonary artery during an attack of asthma].

22 patients with asthma attacks were examined by microcatheter and the pressure in the pulmonary artery (PAP) was measured. The bronchial obstruction is characterized by decrease of FEV 1.0 (average mean 44% of the vital capacity). The average pressures in the pulmonary artery change from 12 to 32 Torr (1.5 kPa to 4.2 kPa) during asthma attacks. Average of the PAP mean 20 Torr (2.7 kPa). The examination was completed by application of 0.24 g aminophylline via the catheter. Decrease of the PAP of 4.1 Torr (0.5 kPa) led also to a decrease of wheezing. In 9 patients an additional decrease of the PAP was effected by the application of 0.8 mg nitroglycerin.