Thoracic and arterial pressures, blood flow and syncope.
The relationship between elevation of the thoracic pressure and the thoracic volume and blood pressure was investigated in man. Raising the thoracic pressure produced an increasing hypotension and ultimately fainting. Cine-radiography showed a reduction in heart size while the high thoracic pressure was maintained.
D000818:Animals; D001775:Blood Circulation; D001794:Blood Pressure; D002933:Cineradiography; D004285:Dogs; D006321:Heart / Q000000981:diagnostic imaging; D006801:Humans; D011312:Pressure; D013575:Syncope / Q000503:physiopathology*; D013909:Thorax / Q000503:physiopathology*; D014636:Valsalva Maneuver