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Uptodate Reference Title
Single-lead electrocardiogram showing a prolonged QT interval
Single-lead electrocardiogram showing a prolonged QT interval
The corrected QT interval (QTc) is calculated by dividing the QT interval (0.60 seconds) by the square root of the preceding RR interval (0.92 seconds). In this case, the QTc is 0.625 seconds (625 milliseconds).
