Tachycardia: Hi GirishZ, it depends on how fast your HR is. Considering your age(26), i would be curious why a cardiac MRI is needed. And if so, you likely are under close follow up with a doctor. If you have a rapid HR, it would best for you in general, to get it below 110. See your doctor if it is consistently higher than that or if you are having symptoms. Hope thats helpful.
Answered 8/5/2016
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