The left atrial appendage (LAA) is a small, ear-shaped sac in the muscle wall of the left atrium (top left chamber of the heart). It is unclear what function, if any, the LAA performs.
http://my.clevelandclinic.org/services/heart/services/arrhyt...
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this study, LAA emptying velocity was measured 1 cm within the LAA.

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During atrial systole, LAA contraction and emptying is seen above the baseline. Velocity is 60 ±14 cm/sec.
During early systole, LAA filling is seen below the baseline. Velocity is 52 ± 13 cm/sec.
Passive flow during the remainder of systole is seen as alternating small waves on both sides of the baseline.
Early diastolic LAA emptying during LV early filling seen above the baseline. Velocity is 20 ± 11 cm/sec.
http://pie.med.utoronto.ca/TEE/TEE_content/TEE_spectral_left...
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Left Atrial Appendage Emptying Flow Velocity Significantly

http://circ.ahajournals.org/cgi/content/meeting_abstract/126...

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Left atrial appendage peak emptying flow velocity; LAD:
http://www.cardiovascularultrasound.com/content/10/1/50

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Mean left atrial appendage peak emptying flow velocity was significantly higher in patients with successful than in those with unsuccessful cardioversion
http://www.researchgate.net/publication/11450010_Clinical_va...