AJP - Gastrointestinal and Liver Physiology, Vol 269, Issue 2 262-G268, Copyright © 1995 by American Physiological Society
Equine pelvic flexure myoelectric activity during fed and fasted states
A. M. Merritt, R. B. Panzer, G. D. Lester and J. A. Burrow
Department of Large Animal Clinical Sciences, College of Veterinary Medicine, University of Florida, Gainesville 32610-0136, USA.
The pelvic flexure is the midpoint of the equine large colon that marks the
junction of dorsal and ventral components. Previous studies of intraluminal
pressure in this region indicate that it could be an important motility
control center. The present study was undertaken to expand our knowledge of
normal myoelectric activity around the pelvic flexure region. Eight bipolar
silver wire electrodes were surgically fixed at 5-cm intervals to the
colonic serosa of five adult horses, starting 30 cm oral to the pelvic
flexure on the left ventral colon and ending 15 cm aboral to the pelvic
flexure on the left dorsal colon (LDC). Recordings of myoelectric activity
were done after feed had been withheld for 20 h or when the horses had been
allowed to eat hay up to the time of the recording session. The activity
was recorded on a polygraph, digitized, processed through a commercial
graphics software package, and stored on magnetic tape for later analysis.
Action potential activity was basically separated into long spike bursts
(LSB) that were > or = 4 s duration and short spike bursts (SSB) that
were < 4 s duration and quantified by a software program developed
exclusively for the equine large intestine.(ABSTRACT TRUNCATED AT 250
WORDS)
