Effect of Valsalva maneuver on the inferior vena cava in man.
D005260:Female; D006503:Hepatic Veins / Q000000981:diagnostic imaging; D006801:Humans; D007483:Iothalamic Acid; D008297:Male; D011859:Radiography; D014636:Valsalva Maneuver; D014682:Vena Cava, Inferior / Q000000981:diagnostic imaging*
D007483:Iothalamic Acid