NZer1 wrote:
Hi Dr S.
Have there been any studies on valves over time? Valves that have not been touched/PTA'ed to see if there are any changes in their performance or function?
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Separate question;
If after PTA the valve re-stenosis' then is it valve related or incomplete destruction of valve and annulus or is it another area that was previously unseen or missed?
Personally, i think that valve restenosis may occur for severl hypotheses
1. thrombus formation on the treated valves leads to scar tissue or adhesions between the valve leaflets
2. the valve stiffness results in gradual recoil into stenotic valves
3. incomplete treatment did not relieve the original obstructing process.
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I am wondering if there may be an issue with the valves and that thickening or generally non functioning valves may be changing over even short periods of time eg the 're-stenosis' average after PTA.
If for instance in normal life the function of the valve waxes and wanes like MS does!
1. J Physiol Heart Circ Physiol. 2008 Jun;294(6):H2480-8. doi: 10.1152/ajpheart.91431.2007. Epub 2008 Apr 4. Mouse heart valve structure and function: echocardiographic and morphometric analyses from the fetus through the aged adult. Hinton RB Jr, Alfieri CM, Witt SA, Glascock BJ, Khoury PR, Benson DW, Yutzey KE.
This study showed that there were very dynamic changes in valve composition during fetal life that stabilized except for progressive thinning during mature life with gradual annular thickening in late life.
2. Circulation. 2006 Mar 14;113(10):1344-52. Human semilunar cardiac valve remodeling by activated cells from fetus to adult: implications for postnatal adaptation, pathology, and tissue engineering. Aikawa E, Whittaker P, Farber M, Mendelson K, Padera RF, Aikawa M, Schoen FJ.
This study concludes that the cells in fetal valves are dynamic but that cells in adult valves become very quiet and that thickening is due to collagen maturation in an extracellular manner.
improbable
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It is mysterious how this disease is fluctuating in two scenarios, one to a healthy lifestyle (change) and two with PTA and both are very similar outcomes symptomatically

i am not sure that they are that similar.
Now that White Matter lesions are found to be less connected to MS disease symptoms there may at last be a shift to measuring actual symptoms! This 'should' help find the tools to measure PTA benefits with a 'real' assessment.

Nigel
NIgel, relapse rate may have nothing to do with the valves, but rather to an underlying autoimmunity resulting from the orginal insult even if valves are no longer stiff, and obstructed. symptoms, on the other hand, may be altered by opening up the valve and improving arterial inflow, cerebral perfusion and CSF drainage.
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Diet changes and medications seem to alter the relapse rate and in some even halt progression, so could that mean the flow has improved without PTA?
yes