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A 27-year-old male asked:

is this normal qt interval 335 and qtc 435 and heart rate 104? ecg showed sinus tachycardia,

3 doctor answers5 doctors weighed in
Dr. Steven Ajluni
Cardiology 35 years experience
HR slightly fast : A hr of 104 at rest (sinus tach) is slightly higher than the normal range of hr's between 60-100 at rest. That said, there could be plenty of reasons that this coud happen (like anxiety, dehydration, caffeine, pain, etc). Also anemia, hyperthyroidism , breathing or pulmonary problems could result in physiologically appropriate faster hr's. Inappropriate sinus tach considered if no cause seen.
Dr. Mohamed Kanj
Cardiac Electrophysiology 24 years experience
Normal QT: A qt of 335 msec and a qtc of 435 msec are normal qt intervals.
Dr. Milton Alvis, jr
Preventive Medicine 41 years experience
QTC a bit Long ?Prob: Question reflects sophistication. Qt prolongation ↑ingly recognized as correlating with a few genetic and/or physiologic issues associated with ↑ed incidence of arrhythmias, sometimes suddenly fatal. However: underlying issues complex, qt varies with rate (reason for qtc), often difficult to read accurately & limited surface indicator. If a concern, best recheck other clues & when rate more normal.

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Last updated Jul 26, 2019

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