Inappropriate sinus tachycardia, a difficult condition known by rapid sinus heart rate without an obvious contributing factor. ========================== Warning to all scrapers, do not change source of infographics and do not try to modify infographics,
I was diagnosed with IST about a year ago, but have been suffering for at least 10 years. It's a rough condition that mostly just seems to make everything harder. This is a good list of general info about how IST affects people.