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=== | ===How to measure QT if the QT segement is abnormal=== | ||
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{| class="wikitable" | |||
!colspan='3'|How to measure QT if the QT segement is abnormal | |||
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|[[File:lastigeQT1.png|250px]] | |||
|[[File:lastigeQT2.png|250px]] | |||
|[[File:lastigeQT3.png|250px]] | |||
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|The T wave is broad, but the tangent crosses the baseline before the T wave joins the baseline. The QT interval would be overestimated when this last definition of the end of the T wave would be used. | |||
|The ECG does not meet the baseline after the end of the T wave. Still, the crossing of the tangent and baseline should be used for measurements. | |||
|A bifasic T wave. The tangent to the 'hump' with the largest amplitude is chosen. This can change from beat to beat, making it more important to average several measurements. | |||
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</div> | </div> | ||