Basic Research
Copyright ©The Author(s) 2003. Published by Baishideng Publishing Group Inc. All rights reserved.
World J Gastroenterol. May 15, 2003; 9(5): 1014-1019
Published online May 15, 2003. doi: 10.3748/wjg.v9.i5.1014
The study between the dynamics and the X-ray anatomy and regularizing effect of gallbladder on bile duct sphincter of the dog
Jing-Guo Wei, Yao-Cheng Wang, Guo-Min Liang, Wei Wang, Bao-Ying Chen, Jia-Kuan Xu, Li-Jun Song
Jing-Guo Wei, Yao-Cheng Wang, Guo-Min Liang, Wei Wang, Bao-Ying Chen, Jia-Kuan Xu, Li-Jun Song, Radiology Department of Tangdu Hospital, Fourth Military Medical University, Xi’an 710038, Shaanxi Province, China
Author contributions: All authors contributed equally to the work.
Correspondence to: Dr Jing-Guo Wei, Department of Radiology, Tangdu Hospital, Fourth Military Medical University, Xi’an 710038, Shaanxi Province, China. tdradio1@fmmu.edu.cn
Telephone: +86-29-3377163 Fax: +86-29-3377163
Received: October 17, 2002
Revised: October 24, 2002
Accepted: November 13, 2002
Published online: May 15, 2003
Abstract

AIM: To study the relationship between the radiological anatomy and the dynamics on bile duct sphincter in bile draining and regulatory effect of gallbladder.

METHODS: Sixteen healthy dogs weighing 18 kg to 25 kg were divided randomly into control group and experimental group (cholecystectomy group). Cineradiography, manometry with perfusion, to effect of endogenous cholecystokinin and change of ultrastructure were employed.

RESULTS: According to finding of the choledochography and manometry, in control group the intraluminal basal pressure of cephalic cyclic smooth muscle of choledochal sphincter cCS was 9.0 ± 2.0 mmHg and that of middle oblique smooth muscle of choledochal sphincter (mOS) was 16.8 ± 0.5 mmHg, the intraluminal basal pressure of cCS segment was obviously lower than that of mOS (P < 0.01) in the interval period of bile draining, but significant difference of intraluminal basal pressure of the mOS segment was not found between the interval period of bile draining (16.8 ± 0.5 mmHg) and the bile flowing period (15.9 ± 0.9 mmHg) (P > 0.05). The motility of cCS was mainly characterized by rhythmically concentric contraction, just as motility of cCS bile juice was pumped into the mOS segment in control group. And motility of mOS segment showed mainly diastolic and systolic activity of autonomically longitudinal peristalsis. There was spasmodic state in cCS and mOS segment and reaction to endogenous cholecystokinin was debased after cholecystectomy. The change of ultrastructure of cCS portion showed mainly that the myofilaments of cell line in derangement and mitochondria is swelling.

CONCLUSION: During fasting, the cCS portion has a function as similar cardiac "pump" and it is main primary power source in bile draining, and mOS segment serves mainly as secondary power in bile draining. The existence of the intact gallbladder is one of the important factors in guaranteeing the functional coordination between the cCS and mOS of bile duct sphincter. There is dysfunction in the cCS and mOS with cholecystectomy.

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