I have been diagnosed with SVT. PVCs for the last several years. Tonight, and this has happened only a couple of other times in the past, I distincty felt my heart beat three times fast in a row and then return to the normal rate (which at the time was faster than normal). For the last year I have had palpitations every day, some days all day long. Until this past year palpitations were fairly quiet and not bothersome. I did have a 48 hour monitor months back, but, of course nothing much showed up during that time period. The three beats in a row, is this a new concern and should I consult my cardiologist again. I also had an echo at the time of the monitor and it was fine.

Summarized question: What causes supraventricular tachycardia?