Question to all: Did anyone with POTS get tested for:
Vasodilators other than histamine:
excessive circulating vasodilators are a reason for POTS. when standing up, leg vessels have to vasoconstrict, which is more difficult if they just dilate..
Diminished vasoconstrictive reaction of blood vessels to sympathetic vasoconstriction:
a reason for high-norepinephrine (=noradrenaline) POTS is that the sympathetic signal for "blood vessels in the legs, please constrict right now" isnt reacted to by the blood vessls. so then what happens: the command to constrict is shouted louder and louder. like the proverbial foreigner trying to make himself understood ...
The issue with measurement is that both of these conditions result in more and more sympathetic activation / sympathetic vasoconstrictory effort, which is well measurable via hugely increasing norepinephrine levels when patient tries to stand. but there we are just generally with all the category of high NE-POTS. so how do we differentiate between the various pathologies within this category? the above mentioned two issues would have quite similar features the so much mentioned vagus nerve anomalities / acetylcholine lack. even the impairment of digestion would be the same , because with all that symp activation nobody can digest.
- but the pathomechanism and treatment in all these cases is totally different!! --> testing testing testing!
I would be very curious.to learn more! Equally, I can contribute some research papers on these & pots. We could open a new thread (or stay here) if there is interest.
Btw I did not see these explicitly covered by
@DrDiana
http://www.potscare.com/research/
– intracranial pressure problems
– vagus nerve anomalies
– the activation of histamine- producing cells (not restricted to mast cell activation or MCAS)
– vascular anomalies
– joint hypermobility or Ehlers Danlos syndrome in conjunction with the above
And to avoid any misunderstandings, this line above "did not see these explicitly covered" is not the slightest criticism. It is meant 1. as a question as the above list from Dianas website was not said to be complete but examples; and 2. if the answer is no, then as a small addition to our shared efforts to search for possible causes. I think that just because Diana established new methods of POTS treatment, it would not be a correct thing to expect her clinic to immediately cover 100% of all, frequent or rare, measurable or unmeasurable causes of POTS. We should be happy with what she can give. Having said that, it would be great to know where the current limits of the clinic's offer are, so we understand where it is worth to search further. thanks in advance!