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Conduction: Difference between revisions
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→The QT interval
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==The QT interval== | ==The QT interval== | ||
The QT interval indicates how fast the ventricles are repolarized and how fast they are ready for a new heart cycle | The QT interval indicates how fast the ventricles are repolarized and how fast they are ready for a new heart cycle | ||
The normal value for QTc(orrected) is: 440ms for men and 450 ms for women. | |||
The normal value for QTc(orrected) is: 440ms for men and 450 ms for women. | |||
[[Image:QRSinterval.jpg|thumb| The QT interval start at the onset of the Q wave and ends where the tangent line for the steepest part of the T wave intersects with the baseline of the ECG. Click on the image for a bigger image]] | [[Image:QRSinterval.jpg|thumb| The QT interval start at the onset of the Q wave and ends where the tangent line for the steepest part of the T wave intersects with the baseline of the ECG. Click on the image for a bigger image]] | ||
The QT interval comprises the QRS-complex, the ST-segment, and the T-wave. | The QT interval comprises the QRS-complex, the ST-segment, and the T-wave. | ||
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Using the QTc calculator on the right, the QTc is easy extractable. | Using the QTc calculator on the right, the QTc is easy extractable. | ||
<flash>file=QTc.swf|width=300|height=200|quality=best|align=right|salign=R||bgcolor=#FFF5F5</flash> | |||
On the modern ECG machines, the QTc is given. However, the machines are not always capable of recognizing the correct QT time. Therefore, it is important to check this manually.. | On the modern ECG machines, the QTc is given. However, the machines are not always capable of recognizing the correct QT time. Therefore, it is important to check this manually.. | ||