I'm glad to see we are moving away from the dogma that vein malformations are solely "truncular" in origin. Why is it so difficult to consider that persistent muscle tension could actually deform the veins? And this could account for the very high incidence of female MS in Scotland, for example.Even Dr. Sclafani is willing to consider muscle tension as a factor (well, more in the immediate than in development.)
Here are some quotes
Cece July 12, 2012
I agree with the truncular malformation argument, ever since the consensus document from the phlebologists back in 2009 or early 2010. But I have wondered if cold affects blood flow and angiogenesis differently than hot does. In the south, if veins are ever dilated due to heat, do the main veins or collateral veins grow bigger during childhood development, and it is enough to counter the effects of the outflow obstructions?
Cece posted Jan 25, 2013
“Certain findings suggested
a reorganization after birth of the venous valves which are frequently met in
fetus. The close relation between hemodynamic mechanisms and the blood guiding
structures may explain the changes (disappearance or persistence) of venous
valves in some areas after birth.”
Cece "I thought this was
interesting. We've talked about the malformation of internal jugular vein
valves as happening during embryological development. I had never heard about
changes in the valves occurring after birth. What sort of changes?
"Disappearance or persistence"? How could a valve disappear?"
Cece posted:Feb 22,2013
However, preventing vein wall smooth muscle contraction allows passive dilation
of veins and when a critical diameter is reached, a functioning venous valve becomes dysfunctional
or incompetent. As half of a women’s adult lifetime is under the influence of progesterone,
and this is exacerbated markedly during pregnancy, it is no wonder that primary venous insufficiency
is twice as common in women than in men.7
Jan 31, 2013. Dr. Sclafani
“if the valve is obstructed, generally what happens is that the
vein above the stenosis starts to dilate or enlarge. Slow flow or stasis
(absence of outflow) occurs. This leads to reduced arterial inflow, poorer
perfusion with oxygenated blood into the brain and reduction in cerebrospinal
fluid drainage and possibly hydrocephalus. Additionally, when the muscles of
the 1neck contract, they MAY cause the pressurization of the blood within the
vein. In the presence of obstruction toward flow into the heart, this blood may
jet into the skull and injure deep cerebral veins.”
Ms Cure Enigmas.net
http://www.mscureenigmas.net/index.html