question: Hi doctor, I frequently get palpitations, usually a few times a day. I had a 24-hour ECG a couple of years ago. My general practitioner said it just showed some ectopics. However, I do get runs of palpitations lasting several seconds which make me feel light-headed. I can usually stop the run by coughing hard. Is this anything to worry about? My main concern is that I might pass out or that I might develop a fatal arrhythmia.