ECG Rhythm Interpretation_Reading 12 lead ECG

Posted by e-Medical PPT Tuesday, August 3, 2010
Axis refers to the mean QRS axis (or vector) during ventricular depolarization. As you recall when the ventricles depolarize (in a normal heart) the direction of current flows leftward and downward because most of the ventricular mass is in the left ventricle. We like to know the QRS axis because an abnormal axis can suggest disease such as pulmonary hypertension from a pulmonary embolism.
The QRS axis is determined by overlying a circle, in the frontal plane. By convention, the degrees of the circle are as shown.
The normal QRS axis lies between -30o and +90o.
A QRS axis that falls between -30o and -90o is abnormal and called left axis deviation.
A QRS axis that falls between +90o and +150o is abnormal and called right axis deviation.
A QRS axis that falls between +150o and -90o is abnormal and called superior right axis deviation.

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1 Response to ECG Rhythm Interpretation_Reading 12 lead ECG

  1. Anonymous Says:
  2. Thanks very much author...

     

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