Sunday, August 10, 2014

Evaluating axis from ECG (Mnemonic)

Hi everyone! We are going to learn how to determine the axis from an electrocardiogram =D

First of all, do you know which two leads should be looked at to determine whether axis is in the normal quadrant or if it is Left Axis Deviation (LAD) or Right Axis Deviation (RAD)?

Look at lead I and lead II. Sounds simple! ^__^

An upright (positive) QRS in leads I and II is normal (–30 degrees to +105 degrees).
In left-axis deviation, there is an upright QRS in lead I and a downward (negative) QRS in lead II (< –30 degrees).
In right-axis deviation, there is a downward QRS in lead I and an upright QRS in lead II (> +105 degrees).

How do I remember this? @_@

Thumbs up method: Lead I = Left thumb, Lead II = Right thumb.

Wait, why lead I is left thumb and lead II is the right thumb?
Because left is a smaller word and it gets the smaller number, that is, one!
Right has more alphabets and it gets the bigger number, that is, two.

Left thumb up (I) + Right thumb up (II) = Normal.
Left thumb up (I) + Right thumb down (II) = LAD.
Left thumb down (I) + Right thumb up (II) = RAD.

Mnemonic method:
Left leaves, right returns.

That's all!
Have a splendid week everyone < 3
-IkaN


2 comments:

  1. lead 2 ?? is it not lead 1 & aVF?

    ReplyDelete
  2. QUIZ
    QRS amplitude in lead 1 = +0.6mV and that of lead aVF = -0.3mV ...comment about the axis?
    LAD/RAD/NORMAL/NORTH-WEST QRS axis ??

    ReplyDelete

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