Why the study?
Does constant infusion of acetylcholine directly into the pulmonary artery reduce pulmonary artery pressure in patients with chronic pulmonary disease?
Does constant infusion of acetylcholine directly into the pulmonary artery reduce pulmonary artery pressure in patients with chronic pulmonary disease?
Vasomotor activity appears to be only one of several factors determining pulmonary artery pressure in chronic pulmonary disease, with anatomic or extravascular factors likely playing a primary role.
Minimal acetylcholine response in chronic lung disease cautions against vasomotor primacy; leaves open anatomic/extravascular factors for mechanistic study.
Twenty-seven patients with various forms of chronic pulmonary disease have been studied with constant infusion of acetylcholine directly into the pulmonary artery. Although many showed a slight decrease in pulmonary artery pressure, this was not great and those with the highest pressures showed the least response. Pulmonary resistances showed similar small changes, if any. Arterial oxygen saturations did not fall uniformly and in those with the lowest levels, an actual increase was observed. It is suggested that vasomotor activity is only one of several factors determining pulmonary artery pressure in patients with chronic pulmonary disease and that anatomic or extravascular factors may become primary. Vasomotor activity seems to be relatively unimportant in the regulation of ventilation/perfusion relationships in patients with far-advanced disease.
No takes yet. Share an insight, caveat, or question.
CHARMS et al. (1962) studied this question.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: