Assessment of Canine Gastric Contraction by Surface Electrogastrography

Rhim, Heon Kil; Park, Kyung Nam; Lee, Min Ho; Rhee, Jong Chul; Kim, In Young; Park, Hun Jin; Rhee, Poong Lyul; Sohn, Chong Il; Hahm, Joon Soo; Kim, Jong Sung; Han, Wan Taek

Abstract

BACKGROUND AND AIMS: The aim of this study was to assess canine gastric contraction by surface electrogastrography (EGG).
METHODS
Serosal EGG, surface EGG and measurement of gastric contraction by strain gauge were performed simultaneously in 20 unconscious dogs during the motor quiescence period and the contraction period induced by bethanechol. Amplitude, wave form, frequency and vector analysis of EGG were performed.
RESULTS
During motor quiescence period, normal smooth sine wave was maintained. During gastric contraction, the amplitude of slow wave was increased and the wave form of it changed into a late peak and descending arm in cutaneous wave was dominated. On the frequency analysis of the motor quiescence period, a single dominant wave of three cycles per minute (3 cpm) was observed. During the contraction, the dominant frequency was 3.5 cpm, and a marked increment was observed in first harmonic compared to motor quiescence period. There was rough correlation between the power of first harmonic and gastric contractions. In the vector analysis of motor quiescence period, the average axis of EGG vector was 62.7, y=0.00512+1.935x and the coefficient of determination was 0.476. During gastric contraction, the average axis of EGG vector was 12.6, y=0.00377+0.228x, and the coefficient of determination was 0.00281 (p<0.05).
CONCLUSIONS
Gastric contractions could be assessed by surface EGG in terms of such parameters.