<s>[INST] I was laying in bed and my heart whent from normal to Extremely fast like i was about to have a heart attack and then it stopped for almost a full minute and then started normally again what happened my friends told me it could be a heart murmer but it really scared me could you tell me what happened? [/INST] Hi, What you have experienced are palpitations, and palpitations are caused by a lot of factors which may include intrinsic heart problems like arrhythmias and valve problems, thyroid disease, as well as external factors like intake of caffeine-containing beverages, alcoholic beverages, and even anxiety. Some palpitations are just benign but some may be associated with fatal arrhythmias especially that you felt like you are about to have a heart attack. With these possible causes, I would greatly recommend a check-up with a doctor for appropriate examination to check for the rhythm of your heartbeat, as well as for work-up to rule out any other causes of your palpitations. From this, they would be able to determine the appropriate management strategy. Hope I have answered your query. Let me know if I can assist you further. Regards, Dr. Daryl Derick B. Dizon, General & Family Physician </s>