Conduction: Difference between revisions

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24 bytes removed ,  5 January 2008
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'''A often used definition of the QT interval is the time between the beginning of the Q until the point where the steepest tangent line from the end of the T-wave intersects with the base line of the ECG.'''<cite>Lepeschkin</cite>   
'''A often used definition of the QT interval is the time between the beginning of the Q until the point where the steepest tangent line from the end of the T-wave intersects with the base line of the ECG.'''<cite>Lepeschkin</cite>   


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!Stepwise approach to correct measurement of the QT interval|-
!Stepwise approach to correct measurement of the QT interval|-
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#The QT interval starts at the beginning of the QRS interval and ends where the tangent and baseline cross.
#The QT interval starts at the beginning of the QRS interval and ends where the tangent and baseline cross.
#If the QRS duration exceeds 120ms the amount surpassing 120ms should be deducted from the QT interval (i.e. QT=QT-(QRS width-120ms) )
#If the QRS duration exceeds 120ms the amount surpassing 120ms should be deducted from the QT interval (i.e. QT=QT-(QRS width-120ms) )
#Calculate QTc according to Bazett:  
#Calculate QTc according to Bazett: [[Image:Formule_QTc.png]]  
[[Image:Formule_QTc.png]]  
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