Which imaging modality is used to assess left atrial appendage contraction velocity?

Which imaging modality is used to assess left atrial appendage contraction velocity?

• A. Pulsed-wave Doppler assessment of the left atrial appendage
• B. Transthoracic echocardiography
• C. Transesophageal echocardiography
• D. MRI

Answer: (A)

LAA contraction velocity is quantified using pulsed-wave Doppler by placing the sample volume at the left atrial appendage orifice and measuring the flow velocity during atrial systole. This Doppler-derived peak emptying velocity is the most direct way to assess how effectively the LAA contracts. Transesophageal echocardiography is typically used because it provides the best visualization of the LAA and allows precise Doppler alignment, giving reliable velocity measurements. Transthoracic echo often cannot visualize the LAA well, and MRI doesn’t routinely provide this Doppler velocity measurement.

LAA contraction velocity is quantified using pulsed-wave Doppler by placing the sample volume at the left atrial appendage orifice and measuring the flow velocity during atrial systole. This Doppler-derived peak emptying velocity is the most direct way to assess how effectively the LAA contracts. Transesophageal echocardiography is typically used because it provides the best visualization of the LAA and allows precise Doppler alignment, giving reliable velocity measurements. Transthoracic echo often cannot visualize the LAA well, and MRI doesn’t routinely provide this Doppler velocity measurement.