Conduction: Difference between revisions

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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'''. <cite>aha2</cite>
The normal value for QTc is: '''below 450ms for men and below 460ms for women''' as agreed upon by the ACC / ESC. <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>