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At least 1,081 records · Page 60Linked to original sources
PubMed1977

Effects of hemodialysis and saline loading on body fluid compartments, plasma renin activity and blood pressure in patients on chronic hemodialysis.

The influence of one hemodialysis session and of subsequent loading by 1.5-2 liters N saline on blood pressure, PRA and body fluid compartments was assessed in seven patients with chronic renal failure on maintenance hemodialysis. Dialysis caused only slight decreases in plasma volume, ECV and in TEBS. Lying mean blood pressure by 5-10 mm Hg and PRA increased by 30%. Saline loading resulted in a significant increase in plasma volume by 0.4 liters and in blood pressure by 10-5 mm Hg, but in a decrease in PRA by 40%. The changes in mean blood pressure correlated positively with the changes in plasma volume, and negatively with the changes in PRA. It is concluded that the renin-angiotensin system in patients on chronic hemodialysis still functions as one of the adjustment mechanisms for the circulatory homeostasis, when challenged by volume loss or volume and sodium loading.

Adult↗
PubMed1989

Determination of doxycycline in bovine tissues and body fluids by high-performance liquid chromatography using photodiode array ultraviolet-visible detection.

A sensitive and selective high-performance liquid chromatographic assay was developed to quantitate doxycycline concentrations in bovine tissues and body fluids. The method involved sonication of doxycycline-spiked minced tissues with appropriate solutions to extract tissue-bound drug. Acetonitrile:85% phosphoric acid:water (20:2:78) was added to doxycycline-spiked serum or urine. The mixtures were ultrafiltered through 30,000 or 10,000 Da molecular weight cutoff microseparation systems. Separation was obtained by a reversed-phase microbore column. Absorbance of the column effluent was measured by an ultraviolet-visible photodiode array detector scanning from 235 to 380 nm and/or a photometric detector operated at 268 or 345 nm. Chromatographic peak homogeneity was evaluated by three-dimensional spectrochromatograms, contour maps, and absorbance ratios.

Animals↗
PubMed2006

Determination of amikacin in body fluid by high-performance liquid-chromatography with chemiluminescence detection.

A simple and sensitive method was developed for the quantification of amikacin in human plasma and urine samples. The method involves centrifugation of body fluid plasma after dilution with an ethanol/sodium carbonate mixture, and then an aliquot of the supernatant is directly injected into the chromatograph. After separation on a reversed-phase C18 column (runtime 20 min), aminoglycoside is detected on the basis of its complex formation reaction with Cu(II), the catalyst of the luminol/hydrogen peroxide chemiluminescence system. Using a volume of 500 microl biological sample, linearity is established over the concentration range 0.15-2.0 microg/ml and the limit of detection (LOD) is ca. 50 microg/l in plasma or urine. The intra-day and inter-day precision (measured by relative standard deviation, R.S.D.%) are always less than 9%, and relative recoveries are found to be over 92%.

Amikacin↗
PubMed1979

Determination of prostaglandins in body fluids and tissues.

The biosynthesis of prostaglandins is a very rapid reaction. Since blood platelets, when disturbed, readily convert e.g. arachidonic acid into prostaglandin E2 and F2 alpha, those compounds cannot be quantitated in body fluids or tissues which contain platelets. When present in the circulation, primary prostaglandins are rapidly inactivated to corresponding 15-keto-13, 14-dihydro metabolites which occur in plasma in about ten times higher concentrations than the primary prostaglandins. The basal plasma levels of these metabolites are lower than 100 picog/ml. Therefore highly sensitive and specific techniques are necessary for safe quantitation of prostaglandins. The rapid inactivation of prostaglandins also makes it necessary to carefully determine which metabolite should be quantitated in a given experimental situation. The complexity of prostaglandin biochemistry and its importance for accurate monitoring of prostaglandin synthesis in different experimental situations will be discussed in this article.

Amniotic Fluid↗