CVS Practice Test

Question: 1 / 400

What do you expect to see in leads I and II in left axis deviation?

Lead I is down and lead II is upright

Lead I is upright and lead II is down

In the context of left axis deviation, lead I typically shows an upright deflection while lead II displays a downward deflection. This pattern occurs because left axis deviation indicates that the electrical impulses of the heart are being directed more towards the left side. In lead I, which views the heart's electrical activity from the left, the vector is positioned in the positive direction, resulting in an upright deflection. Conversely, in lead II, the positive electrode is positioned more inferiorly, and with the shift of the electrical axis towards the left, the vector moves away from this lead, causing a downward deflection.

This understanding aligns with the physiological behavior of the cardiac electrical axis and the positioning of the leads. The other potential answers do not accurately represent this electrical activity associated with left axis deviation.

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Both leads are upright

Both leads are down

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