@jeff_w and
@JenB, do you have any thoughts or speculations regarding the timescales of your recoveries from ME/CFS after surgery for CCI/AAI, and the actual mechanism that may have led to ME/CFS recovery? I've got a tentative theory:
If I remember correctly,
@jeff_w's POTS fully resolved pretty much straight away after surgery, the MCAS almost fully resolved, and the ME/CFS symptoms took a few weeks to resolve (taking a little longer in part just because of the normal post-surgical fatigue). And then the MCAS fully resolved after a second surgery for tethered cord.
@JenB's POTS also fully resolved straight away after surgery I believe, but the improvements in ME/CFS symptoms occurred gradually and incrementally over a 6 month period since the surgery.
My thoughts are these: since POTS cleared up immediately, and given that POTS is an autonomic nervous system disease, it seems likely that the POTS was being caused by mechanical brainstem compression, impeding the autonomic nerve signals. So as soon as this mechanical impediment was corrected, POTS just instantly disappeared. Thus one immediate result of the surgery appears to be the restoration of normal autonomic functioning.
But why did resolution of the ME/CFS take a little longer? In
@jeff_w's case a few weeks, and in
@JenB's case 6 months.
My tentative theory that your ME/CFS recoveries might actually have been due to the slower process of viral clearance, which was facilitated by the restoration of autonomic functioning. There are studies which show that both the sympathetic and parasympathetic branches of the autonomic nervous system help control the immune system (see for example
this paper or
this paper).
Thus once autonomic functioning was restored by the surgery, this may have led to an improved immune response, that was better able to tackle viral infection. But presumably it would take some time for the immune system to clear the viral infections, so this could explain why it took several weeks to several months for the ME/CFS to clear up after surgery, even though POTS cleared up immediately.
I am right in thinking that in both cases, you had classic viral ME/CFS: starting after a viral infection, and exhibiting chronic elevated IgG viral antibody levels? So you might expect that ME/CFS will not resolve until these underlying viral infections are cleared.
In
@jeff_w's case, elevated IgG antibody levels returned to normal some time after surgery, suggesting viral clearance. I suspect that if
@JenB were retested, antibody levels would also have returned to normal.
I believe
@JenB had elevated antibodies to coxsackievirus B4, and
@jeff_w elevated antibodies to Epstein-Barr virus.
The above tentative theory is also corroborated by
@jeff_w's
unfortunate incident with a physical therapist who twisted Jeff's neck and damaged the fusion hardware (requiring further surgery to fix): when this damage occurred, Jeff's POTS instantly returned, suggesting once again the mechanical pressure from brainstem compression on the autonomic nerves produced autonomic dysfunction.