Constrictor response of small pulmonary arteries to acute pulmonary hypertension during left atrial pressure elevation.


Acute elevations in left atrial pressure (LAP) were induced by altering the volume of air within a balloon inserted into the left atrium; the changes in internal diameter (ID) of small muscular pulmonary arteries (100-600 microns ID) in response to the associated rises of pulmonary arterial pressure (PAP) were measured using an X-ray TV system on the in… (More)


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