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Anatomy

The left atrial appendage (LAA) is a small process in the muscular wall of the left atrium (upper left chamber of the heart) in the form of a sac. Until now, it is not completely clear what function the left atrial appendage performs; one of the hypotheses speaks of the deposition of blood during cardiac contractions and additional filling of the ventricles with it.

Normally, the heart beats with each beat, and blood from the left atrium and left atrial appendage is squeezed out and passed into the left ventricle (lower left chamber of the heart).