Hypertrophy typically causes QRS axis deviation toward which direction?

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Multiple Choice

Hypertrophy typically causes QRS axis deviation toward which direction?

Explanation:
The main idea is that the QRS axis reflects the net direction of ventricular depolarization. When a ventricle enlarges, the electrical forces it generates become stronger toward that ventricle, pulling the overall vector in that direction. In left ventricular hypertrophy, the left ventricle gains mass, so the depolarization vector shifts toward the left side of the chest, producing left axis deviation on the ECG. If the right ventricle were hypertrophied, you’d expect a rightward (right axis) shift. Superior or inferior deviations aren’t typical for hypertrophy. So leftward deviation is the classic result of hypertrophy, particularly left ventricular hypertrophy.

The main idea is that the QRS axis reflects the net direction of ventricular depolarization. When a ventricle enlarges, the electrical forces it generates become stronger toward that ventricle, pulling the overall vector in that direction. In left ventricular hypertrophy, the left ventricle gains mass, so the depolarization vector shifts toward the left side of the chest, producing left axis deviation on the ECG. If the right ventricle were hypertrophied, you’d expect a rightward (right axis) shift. Superior or inferior deviations aren’t typical for hypertrophy. So leftward deviation is the classic result of hypertrophy, particularly left ventricular hypertrophy.

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