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Hi there,This is Dr Basu, experienced Internal Medicine Specialist.I am here to address your concerns and provide great service.
Diarrhea can be due to the viral infection.
This can cause dehydration and electrolyte abnormalities.
That in result can cause fast heart rate beats.
That can lead to heart attack or ischemic damage to heart from increased cardiac demand.
You should go to the ER for further evaluation.Best wishes,It was my pleasure to help you today.If I have answered all your questions, Please rate my response Excellent (click on the 5th star).Please bookmark my profile for fast, reliable authentic answers!This is the link to my profile:http://www.justanswer.com/medical/expert-mysticdoc/