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Conduction: Difference between revisions
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→The QT interval
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The QT interval indicates how fast the ventricles are repolarized, becoming ready for a new cycle. | The QT interval indicates how fast the ventricles are repolarized, becoming ready for a new cycle. | ||
The normal value for QTc is: '''below 450ms for men and below 460ms for women''' as agreed upon by the ACC / | The normal value for QTc is: '''below 450ms for men and below 460ms for women''' as agreed upon by the ACC / HRS. <cite>aha2</cite> | ||
In a recent ACC consensus document an expert writing group suggest that in a hospital setting the upper limit be raised to the 99th percentile of normal: 470ms in males and 480 ms in females, as approximately 10% to 20% of the general population have a QTc > 440m s. For both men and women QTc > 500ms is considered highly abnormal.<cite>TdP</cite> | In a recent ACC consensus document an expert writing group suggest that in a hospital setting the upper limit be raised to the 99th percentile of normal: 470ms in males and 480 ms in females, as approximately 10% to 20% of the general population have a QTc > 440m s. For both men and women QTc > 500ms is considered highly abnormal.<cite>TdP</cite> | ||