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Patient
Young man 22 years of age, asymptomatic, with no prior history and a normal cardiac ultrasound;
Trace
Normal QT-interval (380 ms) with normal corrected QT-interval regardless of the formula used;
Exergue
The measurement of the QT-interval is generally performed in lead II, at a chart speed of 25 mm/s, by averaging several cycles, using the tangent method to determine the end of the T-wave and by correcting the value using Bazett’s formula.
The analysis of an electrocardiogram includes the systematic measurement of the QT-interval from the beginning of the QRS-complex to the end of the T-wave.