Abstract
The effect of an intravenous dose (2 mg) of propranolol in the lower oesophageal sphincter was studied in 10 human volunteers. A hydraulic-capillary infusion manometric technique was used to measure the lower oesophageal sphincter pressure. A significant increase in sphincter pressure was recorded, together with increased amplitude and duration of oesophageal peristaltic activity. This study confirms the presence of specific beta-receptors in the lower oesophageal sphincter.