: the interval from the beginning of the QRS complex to the end of the T wave on an electrocardiogram representing ventricular depolarization and repolarization and indicating the time during which ventricular contraction and subsequent relaxation occurs see long qt syndrome
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“QT interval.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/QT%20interval. Accessed 3 Nov. 2025.
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