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CFM Cardiology Practice Test

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Which axis category corresponds to a 180º to -90º range?
Correct Answer:
Extreme Axis Deviation
Explanation:
The QRS axis in the frontal plane is the average direction of ventricular depolarization, measured from −180° to +180°. Normal is about −30° to +90°. If the axis shifts further left beyond −90°, you’re into left-axis territory; when it reaches the far left end toward −180°, that region is called extreme axis deviation (often called the northwest axis). The range from 180° (which equals −180°) down to −90° thus lies in this extreme left-directed category, making Extreme Axis Deviation the best match. The other categories describe less extreme leftward tilt or rightward tilt, so they don’t fit this far-left range.

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