Effects of pacing parameters on entrainment of gastric slow waves in patients with gastroparesis

Z. Y. Lin, R. W. McCallum, B. D. Schirmer, J. D.Z. Chen

Research output: Contribution to journalArticlepeer-review

Abstract

The aim of this study was to investigate the effect of pacing parameters on the entrainment of gastric slow waves in patients with gastroparesis. Four pairs of cardiac pacing wires were placed on the serosal surface of the stomach in 13 patients with gastroparesis. After a baseline recording for 30 rain, gastric pacing was performed in a number of sessions with different effective parameters, each lasting for 30 min. The following parameters were found to be effective for the entrainment of the gastric slow wave: a pacing frequency 10% higher than the intrinsic gastric slow wave frequency (IGF), 300 ms pulse width, and 4 mA pacing amplitude. A reduction of pacing amplitude from 4 to 2 mA and 1 mA reduced the percentage of entrainment of the gastric slow wave to 79 ± 10% and 50 ± 11%, respectively. Pacing with a pulse width of 30 or 3 ms was not able to entrain the gastric slow wave in any of the patients. An ectopic pacemaker of tachygastria found in three patients was reversed with gastric pacing. It was concluded that gastric pacing at a frequency up to 10% higher than the IGF and with an amplitude of 4 mA and a pulse width of 300 ms is able to completely entrain the gastric slow wave and normalize gastric dysrhythmias in patients with gastroparesis.

Original languageEnglish (US)
Pages (from-to)G186-G191
JournalAmerican Journal of Physiology - Gastrointestinal and Liver Physiology
Volume274
Issue number1 37-1
StatePublished - Jan 1 1998
Externally publishedYes

Keywords

  • Electrical stimulation
  • Electrogastrography
  • Gastric emptying
  • Gastric pacing
  • Gastrointestinal motility

ASJC Scopus subject areas

  • Physiology
  • Hepatology
  • Gastroenterology
  • Physiology (medical)

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