the basal blood flow of the proximal and distal body of the esophagus , and that of the lower esophageal sphincter , and the vascular response of these sites to intravenous infusion of nifedipine ( 1.0 microgram/kg.min ) and isoproterenol ( 0.1 microgram/kg.min ) were studied .
C0014876
esophagus
C0227192
lower esophageal sphincter