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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Effect of octreotide on gastrostomy, duodenostomy, and cholecystostomy effluents: a physiologic study of fluid and electrolyte balance.

OBJECTIVES: Octreotide, a somatostatin analog, reduces stool and fistula outputs by a mechanism that is not completely understood. Our aim was to study its effect on gastrostomy, duodenostomy, and cholecystostomy effluents in a patient with colorectal cancer. METHODS: Effluents of gastrostomy, duodenostomy, and cholecystostomy were collected in three separate shifts over 24-h periods beginning 3 days before octreotide therapy and continuing for 15 treatment days. Fifty-four samples were tested for volume, pH, acid, and bicarbonate production, and biochemical profiles. RESULTS: A positive fluid balance was achieved immediately with octreotide therapy. Significant decreases in gastrostomy and duodenostomy outputs and in gastric acid production were observed (1433.33 +/- 33.33 ml/24 h to 535.71 +/- 55.31 ml/24 h,p < 0.0001; 2066.67 +/- 66.67 ml/24 h to 247.14 +/- 36.04 ml/24 h, p < 0.0001; and 67.50 +/- 3.20 mEq/h to 13.00 +/- 1.50 mEq/h, p < 0.0001; respectively). Gastrostomy tachyphylaxis was observed after 6 days of treatment. Remarkable dose-dependent increases were found in cholesterol and bilirubin concentrations in the cholecystostomy effluent. CONCLUSIONS: Octreotide's primary effect is a decrease in gastric and pancreatic secretions. The increased concentrations of cholesterol and bilirubin may explain the occurrence of gallstones in patients treated with octreotide.[1]


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