Normal lower oesophageal sphincter pressure is: (A) 5-8 mm of Hg, (B) 10-25 mm of Hg, (C) 25 - 40 mm of Hg, (D) > 40 mm of Hg
Answer is B. The normal lower oesophageal sphincter is 3-4 cm in length and has a pressure of 10-25 mmHgThe LOS is a zone of relatively high pressure that prevents gastric contents from refluxing into the lower oesophagusRef: Bailey and Love 27e pg: 1068