Gastrointestinal sounds and migrating motor complex in fasted humans

Area of Science:

• Gastroenterology
• Physiology
• Digestive System Motility

Background:

• Gastrointestinal sounds are common but their origin and relationship with gut motility remain unclear.
• The migrating motor complex (MMC) is a cyclical pattern of electrical and motor activity in the gastrointestinal tract during fasting.

Purpose of the Study:

• To investigate the relationship between gastrointestinal sounds, antroduodenal motility, and small intestinal transit time in healthy fasted individuals.
• To explore the role of antral contractions in generating gastrointestinal sounds.

Main Methods:

• Gastrointestinal sounds were recorded using abdominal microphones and analyzed by a computer program.
• Antroduodenal contractions were measured using manometry.
• Small intestinal transit time was assessed via breath hydrogen testing after lactulose administration.

Main Results:

• Gastrointestinal sound amplitude correlated with the phases of the migrating motor complex, particularly phase 3.
• Drugs affecting motility (erythromycin, somatostatin analogue, metoclopramide, scopolamine) altered both gastrointestinal sounds and intestinal transit time.
• Antral contractions were linked to increased gastrointestinal sound production.

Conclusions:

• This study establishes a link between gastrointestinal sounds and the migrating motor complex.
• Antral contractions are suggested to be a primary source of gastrointestinal sounds, potentially by introducing gas into the intestine.
• Understanding these relationships may offer insights into digestive motility disorders.