ISSN:
1432-1440
Keywords:
Somatostatin
;
Glomerular filtration rate
;
Vasoactive hormones
;
Renal sodium excretion
Source:
Springer Online Journal Archives 1860-2000
Topics:
Medicine
Notes:
Summary The acute effects of i.v. somatostatin (250 mcg bolus followed by 250 mcg/h continuous infusion for two hours) on renal hemodynamics, renal electrolyte and water handling, and urinary excretion of catecholamines and prostaglandins, as well as on plasma concentrations of arginine vasopressin, atrial natriuretic factor, norepinephrine, epinephrine, dopamine, glucagon, and plasma renin activity were studied in seven normal subjects. Somatostatin decreased effective renal plasma flow and glomerular filtration rate, osmotic and free water clearances, urine volume, and sodium and potassium excretion, while urinary osmolality, fractional excretion of sodium, and phosphate excretion increased significantly. Plasma concentrations of arginine vasopressin, atrial natriuretic factor, norepinephrine, epinephrine, and dopamine remained unchanged, while plasma renin activity (3.0±0.25 vs 2.4±0.2 ng AngI/ml/h;p}〈0.01) and glucagon levels (40±11 vs 20±16 pg/ml;p}〈0.01) decreased. Urinary excretion of norepinephrine, epinephrine, dopamine, PGE2, and PGF2alpha was suppressed under somatostatin. A significant positive correlation was found between urinary dopamine and sodium excretion (r=0.7;p}〈0.001) and urinary postaglandin E2 and glomerular filtration (r=0.52;p}〈0.01). Without accompanying changes in plasma osmolality and vasopressin concentration significant antidiuresis occurred, suggesting a direct tubular effect of somatostatin. However, the hormone-induced changes are due mainly to the decrease in renal plasma flow. The results demonstrate that somatostatin at supraphysiological doses exerts significant effects on the kidney.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01649420
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