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Electrical activity recorded from abdominal surface before and after right hemicolectomy in man
G Riezzo1, F Pezzolla, M A Maselli
1Istituto Scientifico Gastroenterologico, Castellana Grotte, Italia.
Digestion
|January 1, 1994
Summary
Electrosplanchnography (ESG) signals from the abdomen originate partly from the colon. Right hemicolectomy patients showed distinct ESG power changes, identifying right colon signals in the 3.6-7.5 cycles per minute range.
Area of Science:
- Gastroenterology
- Medical Signal Analysis
- Surgical Oncology
Background:
- Electrosplanchnography (ESG) records abdominal electrical activity.
- The precise origin of ESG signals, particularly from the colon, requires further elucidation.
- Understanding ESG components aids in diagnosing gastrointestinal disorders.
Purpose of the Study:
- To determine the origin of abdominal cutaneous electrical signals (electrosplanchnogram, ESG).
- To identify specific colonic contributions to the ESG signal.
- To analyze changes in ESG patterns following right hemicolectomy.
Main Methods:
- Recorded ESG in 6 patients with right colon carcinoma before and after right hemicolectomy.
- Utilized spectral analysis with fast Fourier transform for colonic electrical activity analysis.
- Subdivided spectral frequency components into ranges to calculate dominant frequency and power.
Main Results:
- Significant differences in ESG power profiles were observed between right hemicolectomized and cholecystectomized patients.
- Hemicolectomized patients exhibited a slight increase in power percentage in the 2.6-3.5 cycles per minute (cpm) range.
- A clear reduction in power percentage was noted in the 3.6-7.5 cpm range post-hemicolectomy.
Conclusions:
- The study suggests multiple colonic origins contribute to the cutaneous ESG signal.
- Specific colonic electrical activity from the right colon is identifiable within the 3.6-7.5 cpm range.
- ESG analysis can potentially differentiate colonic signal components.