Thanks Brother for the excellent overview. I am active 70, HOCM, with ICD installed 6mo ago. Your "wierd" trigger has been very real to me over the past 12 years. In fact, it is about the only pattern I have observed related to the onset of slight tightness of breath, followed by dizziness/closing in, and occasional 3 to 5 second loss of awareness. None of this has invoked a reaction by the ICD. Usually can happen after lunch or dinner when I get up and start walking to resume my daily activities, just as I was doing before the meal. Not every day, every meal.

I have shared this definite pattern with my four excellent cardiology specialists and don't get any definitive response from them other than " the body sends blood to organs to digest food". If you or anyone establishes a more documented connection to this syncope phenomenon please pass it along.