OSCE On-Ground Practice Test

What is the normal size of the apical impulse?

Approximately 1 cm (rib space) Approximately 2 cm (two rib spaces) Approximately 0.5 cm Approximately 3 cm (three rib spaces)

Correct Answer:

Approximately 1 cm (rib space)

Explanation:

The apical impulse is the left ventricle’s systolic thrust felt at the apex. In a normal adult, this impulse is small and localized, about 1 cm in diameter—roughly the width of a fingertip—usually located at the left midclavicular line around the 5th intercostal space. This tiny size reflects a normal-sized ventricle; when the impulse is larger (around 2 cm or more) or displaced laterally, it suggests left ventricular enlargement or other cardiac issues. So the normal size is approximately 1 cm.

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