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Biomedical subjects

S F Phillips

Publications and source records attributed to S F Phillips.

At least 253 records · Page 14Linked to original sources
PubMed1971

Colonic secretion of water and electrolytes induced by bile acids: perfusion studies in man.

Each of the three major bile acids of man was tested for its influence on electrolyte and water absorption in the human colon. Transport from isotonic solutions, with or without added bile acids, was compared in 35 studies on 20 healthy volunteers by colonic perfusions under steady-state conditions. Electrolytes and water were always absorbed from control solutions, but dihydroxy bile acid solutions induced continuous secretion or inhibition of sodium, potassium, and water absorption, which was reversible. Deoxycholic acid caused consistent secretion at 3 mm concentrations, whereas chenodeoxycholic acid did not induce secretion until the concentration was 5 mm. The trihydroxy bile acid (cholic acid) produced no significant change in absorption at 10 mm. Inhibition of absorption was also induced by mixtures of the glycine or taurine conjugated bile acids. Secretion of sodium and chloride, induced by bile acid perfusion, was linearly correlated with secretion of water; potassium secretion was relatively constant regardless of the volume of secretion. These results establish a striking influence of bile acids on colonic absorptive activity, provide an explanation in part for the diarrhea that frequently accompanies ileal disease or resection, and imply that diarrhea should occur in other disease states that produce elevated concentrations of dihydroxy bile acids in the colonic lumen.

Bicarbonates↗
PubMed1970

Failure of the human rectum to absorb electrolytes and water.

Absorption of electrolytes and water from the human rectum was quantified by sequential sampling of physiological solutions instilled into the rectum and by the method of continuous intraluminal perfusion. The absorptive function of the rectum measured by the perfusion technique was also compared with that of the entire large intestine. The rectum did not absorb sodium, chloride, or water from isotonic solutions, even after 90 minutes of exposure. The remainder of the colon effectively absorbed sodium, chloride, and water at a rate of approximately 1% of the infused load per minute of contact between perfusates and mucosa.

Adult↗
PubMed1969

Transmural electrical potential difference of the human colon.

The electrical potential across the human colon was measured by a technique which accurately reflects the true mucosa-to-serosa potential difference. Large negative mucosal potentials were recorded from all regions. The potential difference of the sigmoid colon was significantly greater than that of the rectum. The technique may have important applications to the further study of normal or abnormal colonic function.

Colon↗
PubMed1969

Jejunal transport of electrolytes and water in intestinal diseases.

The role of decreased absorption of electrolytes and water by the jejunum in the pathogenesis of diarrhoea was examined in patients with intestinal scleroderma, ileocolitis, gastric hypersecretion, or extensive ileal resection. Absorption of electrolytes and water from a 20-cm segment of jejunum was compared in 10 patients and six healthy volunteers. Malabsorption of electrolytes and water by the jejunum may contribute to diarrhoea in scleroderma, regional enteritis, and gastric hypersecretion. After ileal resection, jejunal absorption was normal.

Adult↗