Question

difference between Auricle and Atrium

Answer 1

The auricle, or “ear” is a protruding part of the left atrium.

The atria are the antechambers of the heart, where blood is briefly stored before being sent to the ventricles, the thicker, more muscular lower chambers of the heart.

This is thought to be because the added muscle mass in the ventricles prevents then from filling all the way passively, and like the "Oshiya" or "pushers" famously seen in Japanese subways during rush hour, the atria fill up the ventricles to an optimal level for each beat.

The auricle (or appendage) of the left atrium is a bloused fold of the left atrium, probably there to unfold and expand left atrial capacity during periods of high cardiac output (when blood is flowing quickly back into the heart).

The significance of the auricle is that it is a by-way of sorts, where blood can pool for a brief time between beats. As long as the beats are regular and the atria contact fully, this slightly stagnant blood is mixed with fresh blood each heartbeat and it's viscosity normalizes.

However, in a condition like atrial fibrillation, the atria don't contract properly and blood can pool in the atrial appendage for long enough that it can start to clot.

Those clots then can be catapulted into the arteries when the heart beats, and, since the first and biggest arteries to branch from the aorta (the large output artery from left heart) go to the brain, strokes often result.

That's why patients with atrial fibrillation often (but not always) are treated with anticoagulants. We use a risk factor scoring system (usually the CHA₂DS₂-VASc Score) to help us to know if the risk of stroke outweighs the risk of bleeding from the anticoagulant treatment.

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Answer 2

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