What causes rapid heart rate with diarrhea in the mid of night?
Patient: I awoke from a nightmare last night and realized that I had a rapid heart rate.  I also experienced the need to use the restroom, which resulted in diarrhea. Can this be considered to be a normal occurrence as this has happened before?  I have had all the tests for heat condition, which were normal. Doctor: Hi,Welcome.This is Dr Sameer.The condition you are telling seems abnormal i.e. Palpitation, tachycardia followed by diarrhoea.This type of scenario generally occurs in a arrhythmia called as supra ventricular tachycardia.So you need to evaluate it further.If all the heart tests have been done, than its fine, but I'll still recommend you for a 24hr ECG monitoring called as Holter Monitoring. This may catch any abnormal palpitation if that occurs in that 24hr period. Otherwise there are additional tests called ELR(Elective Loop Recorder) which can be put for 7 days or a month for ECG monitoring. Come back if you need any more help.Thanks