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General Practice Notebook
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QT elongation

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A QT interval in excess of 0.44 sec is associated with possible development of ventricular arrhythmia, syncope and sudden death.

  • QT interval on the ECG, measured from the beginning of the QRS complex to the end of the T wave
  • QT interval represents the duration of activation and recovery of the ventricular myocardium
    • if there is a prolonged recovery from electrical excitation contributes to increased likelihood of dispersion of refractoriness ( i.e. when some part of myocardium might be refractory to subsequent depolarization)
      • if this occurs then the wave of excitation may pursue a distinctive pathway around a focal point in myocardium (circus reentrant rhythm)
        • resulting in ventricular arrhythmia, hemodynamically ineffective contraction of the ventricles, syncope, and, possibly, sudden death

Click here for an example ECG and further information regarding prolonged QT interval


General Practice Notebook
General Practice Notebook
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