Blood volume and carotid body size responses in spontaneously hypertensive rats during chronic treatment with hypobaric hypoxia or almitrine bismesylate.

The influence of chronic stimulation of the peripheral arterial chemoreceptors on plasma and red cell volumes and on carotid body volume was studied in spontaneously hypertensive rats (SHR). The animals were exposed to chronic hypobaric hypoxia or a chronic treatment with almitrine bismesylate from the 17th to the 30th week of life. At the end of the experiment the plasma volume was significantly lower in chronic hypobaric and almitrine-treated animals; the red cell volume was significantly higher in chronic hypoxic SHR only.

[Comparative estimation of monocompartmental methods of analyzing 99m-Tc-diethylenetriamine pentaacetic acid clearance by declining plasma levels with special reference to long term studies].

Plasma slope clearance estimation with 99m-Tc-DTPA corresponds to total clearance determination. When activity is measured directly in cumulative serum samples, determination of the plasma slope clearance is suitable for practical applications only if simplified analytic procedures are used. Monocompartmental analytic procedure that take the late slope of the disappearance curve into account are particularly useful for GFR estimation.