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A member asked:

What causes sinus tachycardia?

A doctor has provided 1 answer
Dr. Harold Mandel answered

Specializes in General Practice

Causes of IST: Inappropriate sinus tachycardia (IST) occurs when the heart beats very quickly without a good reason. . Sometimes, IST results from inappropriate signaling of the nerves which increase the heart’s rate. The nerves that lower the heart’s rate may also not work well. Sometimes IST starts after a viral infection. Triggers of IST include: alcohol, nicotine, caffeine, cocaine & hyperthyroidism.

Answered 7/24/2019

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