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→How to measure QT if the QT segement is abnormal
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===How to measure QT if the QT segement is abnormal=== | ===How to measure QT if the QT segement is abnormal=== | ||
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!colspan='3'|How to measure QT if the QT segement is abnormal | !colspan='3'|How to measure QT if the QT segement is abnormal | ||
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|valign="top"|[[File:lastigeQT3.png|250px]] | |valign="top"|[[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. | |<div style="margin:5px">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.</div> | ||
|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. | |<div style="margin:5px">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.</div> | ||
|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. | |<div style="margin:5px">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.</div> | ||
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===Short QT syndrome=== | ===Short QT syndrome=== | ||