question: Hi, my name Is David. I have blacked out 4 times over a period of 3 years, have had an MRI scan 2 years ago, I have had a 24hr tape recorder, a tilt test and a running test, and currently have a Loop recorder fitted in my chest.Only 4 weeks ago I had my last blackout, this was by far the most serious as I was driving at the time and caused an RTA where people suffered only minor injuries, this was the only time it has happened whilst driving. I have previously had no prior warning of these events, my blood pressure is perfect my heart rate is normal all tests came back normal. All blackout have happened whilst in a sitting position.