Hi all, During my research I came across oiresource.com which discusses various methods used to alleviate some of our symptoms. Included amongst them is a device called ResQGARD Impedance Threshold Device, made by Advanced Circulatory Systems - http://www.advancedcirculatory.com/ResQGAR...ct_Overview.htm. It is a small, non-invasive unit which applies inspiratory impedance when used to breathe through. It is claimed that "it enhances the negative pressure (vacuum) in the chest, which pulls more blood back to the heart, resulting in increased preload and thus, enhanced cardiac output on the subsequent cardiac contraction." It has been rather difficult finding a direct distributor, but I have some leads if you should desire. I've not yet purchased the device, but since the theory behind it is nothing more than creating a resistance when inhaling, sufficient to enhance negative pressure in the chest, I decided to experiment with other methods capable of producing the same results. To my astonishment, it works. To emulate the inhalation resistance I simply pucker my lips, as if to whistle, but instead of blowing out I inhale. While tightening my lips in such a way that incoming air is forced through a tiny opening, I inhale deeply and strongly, fighting the resistance, for 3 to 5 seconds and then exhale normally. If it sounds like an elephant charging, you're doing it properly. I experimented with this idea last night - I climbed a flight of stairs and hit 137bpm, as usual. Normally I'd immediately lie down for relief, but this time I stood in place and tried this breathing method. Immediately after the first breath, instead of my HR continuing to climb, I observed my heart rate monitor and saw it actually begin to drop. After 4 or 5 more such breaths, my HR returned to the lower 80's - while still standing! To confirm my unbelievable results, this morning I stood up, twice. The first time I stood and just breathed normally and, of course, my HR immediately rose from 66 supine to 115 standing, and continued its upward climb for a couple of minutes. I then rested for half an hour. I then stood up again, but this time while using the resistance breathing method. Confirmed! My HR went from 68 to 95 rather quickly and then settled into the 80's. Even after 10 minutes in a vertical position it never topped 95bpm, although the lightheadedness was not greatly improved. My question is, has anyone else tried this method and what were your results? Has anyone actually used the ResQGARD? Thanks, Simmy