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The extrasystole may have its origin in either the auricle or the ventricle.

This disease is not frequent, while extrasystoles of a functional character are very frequent.

If there is auricular extrasystole it can not usually be recognized except by graphic methods.

Note that diastolic pause in which extrasystole occurs is practically equal to two normal diastolic pauses.

Patients who have occasional extrasystoles will say that all of a sudden the heart turns upside down in the chest.