Double-blind investigation of the effects of propranolol and placebo on the pressure of esophageal varices in patients with portal hypertension

Abstract

This study was aimed at investigating the effects of propranolol on esophageal variceal pressure in patients with portal hypertension. Variceal pressure was measured at endoscopy using a miniature pressure-sensitive gauge in 20 patients with portal hypertension. Measurements were obtained under baseline conditions and 20 min after double-blind administration of propranolol (0.15 mg/kg; n = 10) or an identical amount of placebo (normal saline, 0.3 ml/kg; n = 10). Under baseline conditions, variceal pressure was similar in propranolol and placebo groups (14.1 +/- 5 mm Hg vs. 14.9 +/- 6.6 mm Hg, respectively; not significant). Placebo had no significant effect on variceal pressure (baseline = 14.9 +/- 6.6 mm Hg; placebo = 15.5 +/- 6.6 mm Hg; not significant), and values after placebo administration were closely correlated with baseline values (r = 0.98; y = 1.1 + 0.97 x; p less than 0.0001). In contrast, propranolol caused a significant decrease in the pressure of esophageal varices (from 14.1 +/- 5 mm Hg to 11.3 +/- 4.4 mm Hg; p less than 0.0002). No significant changes in the size of esophageal varices were observed after propranolol or placebo administration. This study shows (a) the endoscopic pressure-gauge technique has a low variability and may be used to assess acute drug-induced changes in variceal pressure; and (b) propranolol causes significant decreases in variceal pressure in patients with portal hypertension and esophageal varices.