| Autor: |
Bogeski G; Department of Anatomy and Cell Biology and Centre for Neuroscience, University of Melbourne, Parkville, VIC 3010, Australia., Shafton AD, Kitchener PD, Ferens DM, Furness JB |
| Jazyk: |
angličtina |
| Zdroj: |
Neurogastroenterology and motility [Neurogastroenterol Motil] 2005 Apr; Vol. 17 (2), pp. 262-72. |
| DOI: |
10.1111/j.1365-2982.2004.00605.x |
| Abstrakt: |
We have developed methods that allow correlation of propulsive reflexes of the intestine with measurements of intraluminal pressure, fluid movement and spatio-temporal maps of intestinal wall movements for the first time in vivo. A segment of jejunum was cannulated and set up in a Trendelenburg recording system while remaining connected to the vascular and nerve supply of the anaesthetized rat. The resting intraluminal pressure in intact intestine was 2-4 mmHg. Hydrostatic pressures of 2, 4, 8 and 16 mmHg were imposed. At a baseline pressure of 4 mmHg, propulsive waves generated pressures of 9 +/- 1 mmHg, that progressed oral to anal at 2-5 mm s(-1). Individual propulsive waves propelled 0.8 +/- 0.4 mL of fluid. The frequency of propulsive waves increased with pressure, but peristaltic efficiency (mL per contraction) decreased with pressure increase between 4 and 16 mmHg. Atropine, as a bolus, transiently blocked peristalsis, but caused maintained block when infused. Hexamethonium blocked propulsive contractions. Inhibition of nitrergic transmission converted regular peristalsis to non-propulsive contractions. These studies demonstrate the utility of an adapted Trendelenburg method for quantitative investigation of motility and pharmacology of enteric reflexes in vivo. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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