AAO

From the suprasternal window, place the PW sample volume in the center of ascending aorta flow. It may be helpful to use color Doppler to align with the center of flow. Optimize the signal to eliminate spikes and feathering.

DAO

From the suprasternal window, place the PW sample volume in the center of descending aorta flow. It may be helpful to use color Doppler to align with the center of flow. Optimize the signal to eliminate spikes and feathering.