TITLE

PHYSICAL FACTORS IN THE DILATION OF VESSELS

AUTHOR(S)
Rodbard, Simon; Teitelman, S. Lloyd; Zimmerman, Leo M.
PUB. DATE
August 1956
SOURCE
Angiology;Aug1956, Vol. 7 Issue 4, p309
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
A study was made of the response of latex tubing to varying levels of pressure. After filling, a linear pressure-volume relationship was obtained. With further filling the curve began to level off, producing less rise in pressure for each unit of volume injected, and finally an asymptotic level was reached. At a critical pressure level the weakest or most dependent segment of the tube ballooned suddenly producing a local �aneurysm.� Attempts to maintain the pressure by addition of fluid caused the dilated segment to widen and extend longitudinally along the tube. This led to elongation and tortuosity of the tubing. The wall of the tube was markedly thinned and weakened in the dilated portion. When fluid was withdrawn the pressure fell very slightly at first and then began to rise. At a critical �recovery� point, the pressure rose suddenly and the tube regained its original characteristics, again being able to resist pressures almost up to the original ballooning point without aneurysmal dilatation. The tendency to ballooning was generally related to the product of the applied pressure multiplied by the diameter of the tube. The recovery point was also a product of these two factors but was set at a lower level. External support pressure permitted higher pressures before ballooning. Weakening of the wall, as by stretching of the tube, lowered the ballooning threshold. Similar factors of stretching are probably involved in the extension of the dilatation to adjacent parts. These factors are discussed in terms of the light they may shed on the mechanics of vascular dilatations such as occur in aneurysms, varices and diverticulae.
ACCESSION #
16349516

 

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