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Axis Deviation

The normal cardiac axis runs from the SAN to in between 30 degrees above lead I and the line of aVF (hence the readings from aVR should be negative). If it's outwith this then this is called axis deviation.  

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In order to check the axis we look at lead 1 and aVf.

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- Both positive (normal axis)

- Lead 1 positive but aVf negative (left axis deviation)

- Lead 1 negative but aVf positive (right axis deviation)

- Both negative (extreme axis deviation - check leads on correct sides or if patient has dextrocardia)

 

Use this outline if you have no prior knowlege of ECGs, how they work or how to set them up. This map will take you through the basic physics and anatomy, set up of the ECG and will touch on interpretation. There is a test at the end to examine your understanding.

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Use this outline if you have some prior knowlege of how an ECG works, its set up and a good understanding of the anatomy of the heart's conducting system. This will focus on interpreting the readings on different leads of the ECG.

 

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Use this map if you already have a thourough understanding of heart anatomy, different arrythmias and their appearance on ECGs. This map focuses on testing your existing knowledge of interpreting ECGs.

 

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