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14991338 tn?1447193706

does the QT interval normally change?

Anyone here know if Q T intervals change from day to day, so to speak?
Im aware severe dehydration and drugs can influence it but just in general, from certain foods weve eaten or drinks perhaps or even natural things like fight or flight?
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1423357 tn?1511085442
Given a resting pulse, I don't believe that the QT Interval should vary greatly day to day in a particular individual.  Of course, it's linked to rate.  So as the rate rises, the QT Interval falls (shortens).
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thats what i thought. But there have been occasions where ive seen my ecg that shows 399 corrected qt for 76bpm, then with a higher heart rate of 92bpm  a qt of 419 corrected ? ? Ive had a stress test so presumably if anything was to be abnormal it would probably shown up
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