A 29-year-old female asked:
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ekg showed qt/qtc of 408/462. is this number too high? i take prozac and zyrtec daily. could that cause a prolonged qt and is it safe to take?

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Dr.
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It's OK: Rule of Thumb is in general we consider QTc of 480+ as something to look at, and even some might consider more than 500 as significant
Answered on Nov 11, 2016

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