Hi I am very new to this - had an episode of palpitations about 14 months ago which prompted my husband to take me to A&E but by the time I was seen it had stopped and the ecg showed nothing of concern, it was put down as a 1 off and I had nothing else till this Tuesday when I had an attack at work and had to call an ambulance as it would not stop - the paramedic did an ecg when he arrived and my heart rate was recorded at 200bpm. In the hospital the diagnosis I was given was SVT. This latest attack/episode lasted over an hour and was very very frightening. It was longer and worse than the previous episode - is this likely or is it just one of those things? Am I likely to have more frequent, longer attacks or is it just a random thing. It has scared me that it will happen again. Thanks.