nereas
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I don't believe that one or two headaches a month would make a neurologist recommend PFO screening or closure. Despite nereas's glowing description of modern surgery, no invasive procedure is 100% successful or without complications, so one needs to be quite sure that the problem being solved is worse than the possible problems being caused.
Remember that, given the frequency of PFO in the population, there are probably a LOT of people out there diving with them and not getting bent. On the other hand, I don't know if anybody has looked at whether people with PFOs with migraines with aura have a higher frequency of Type II hits. Given the rarity of both situations, the intersection of the two groups is likely very small.
I must say that I am indeed very impressed with the skill of modern surgeons, particularly since my recent throat surgery, which went very well. I do know that no surgery is 100% successful for all patients, and therefore I updated my will before the operation, went to confession, and offered up my prayers.
If I had a PFO, and I were a diver, I would definitely get the closure done.
The entire mechanism of off-gassing depends on a closed venous blood supply being filtered by the lungs, without leakage across the heart chambres to the arterial blood supply coming back from the lungs and going out to the body organs.
If you have a PFO, you probably should not be diving. And if you did dive with one, then no NDL schedule nor deco procedure would apply to you, due to the unique problem of the leakage of N2 saturated blood reaching the arterial blood supply and ultimately the brain and spinal cord.
If on the other hand if I were not a diver, then I would not worry about a PFO.
We are very lucky in the 21st Century to have scuba available to us to enjoy, and also to have expert surgeons to fix our bodies whenever they are flawed, diseased, or injured.