Doppler interrogation of LA appendage flow during normal sinus rhythm

A diagram of left atrial appendage (LAA) flow in sinus rhythm is shown on panel A; panel B shows the pulsed-Doppler tracing of LAA flow. Phases of LAA flow include LAA contraction (1); LAA filing (2); systolic reflection waves (positive and negative) (3); early diastolic LAA outflow (4).