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Biomedical subjects

D B Moffat

Publications and source records attributed to D B Moffat.

5 recordsLinked to original sources
PubMed1977

Experimental intrarenal reflux and blood pressure.

The effect on the blood pressure of experimental vesico-ureteric reflux was investigated in adult female Wistar rats. In 6 rats, reflux with isotonic saline produced a transient rise in systemic blood pressure followed by a fall, with return to normal within 2 min (mean BP readings: 121-130-93 mmHg). In 6 rats during water diuresis, reflux with distilled water produced similar changes (114-120-79 mmHg). In 6 rats in which the ureters were divided before reflux, no rise in blood pressure occurred although in 2 of these the pressure showed a marked fall. The pattern of blood pressure changes which occurred as a result of reflux was similar to that produced by a rapid i.v. injection of a corresponding volume of saline and it was concluded that the changes accompanying reflux are due to pyelovenous backflow. This was confirmed by producing reflux with 5% lissamine green which appeared in the peripheral capillaries within 4 s of the reflux in 3 rats. Slow dilatation of the pelvis with saline in 9 rats showed that rupture of the pelvic epithelium occurred at a mean pressure of 99 mmHg.

Animals↗
PubMed1977

Tubulo-vascular relationships in the developing kidney.

The postnatal development of the tubulo-vascular relationships in the kidney was studied in 60 rats. The kidney is relatively immature at birth and only the juxtamedullary glomeruli are present. As their loops of Henle develop they grow down into the medulla around the previously developed collecting ducts, forming tubulovascular 'units' around whose periphery the shorter loops of the more peripheral glomeruli grow down. The bundles of vasa recta develop in loose interstitial tissue which lies between the tubulo-vascular units so that the peripheral vessels of the bundles, which are ascending vasa recta, lie in close relationship with the descending short loops of Henle. Thus, the vascular bundles do not form the central axis around which the medullary components develop but rather take up the available space left after the tubulo-vascular units have developed. Development is virtually complete by the fourth week of postnatal life.

Animals↗
PubMed1976

The role of vesico-ureteric (V-U) reflux in the pathogenesis of kidney scars in the rat.

In Wistar rats V-U reflux with distilled water and sterile saline of varying osmolar strength produces scars in the perihilar region of the kidneys in 80% of animals. Using Indian ink as a marker, rupture of the forniceal epithelium regularly followed V-U reflux. Intrapelvic pressure rose to 120 mm Hg during the reflux procedure. A slowing of proximal tubular transit time was observed by the Lissamine Green technique in the nephrons in the perihilar region immediately after the kidney had been subjected to reflux. It is suggested that the kidney scars which develop after reflux of sterile solutions are ischaemic in origin. It was shown that kidneys damaged by reflux have an increased susceptibility to haematogenous infection.

Animals↗