My grandfather has a laundry list of health issues. He had been diagnosed with Dementia, Parkinsons, emphazema, diabetes, Post op prostate cancer and has just receved a sint in his coradid artery restoreing the blood flow to about 47%. Through out al of this he has had a few larger strokes as well as many TIAs. my question is that they said that he now has an irregular heartrate. He has gone into V-tech several times in the last two days and has come out of it quickly. What exactly is V-tech? what happens to the body when you go into V-tech and what are the consiquences of this?