- pulsed-wave Doppler recording from the left ventricular outflow tract (LVOT) in a fetus with premature atrial contractures (PACs)
- the PACs are seen in a bigeminy pattern (occurring in every other beat)
- the Doppler wave pattern of PACs shows only an A wave without a preceding E wave because they are fused
- PAC referred to premature atrial contraction
- A wave is related to atrial contractions
- E wave is due to early filling Doppler wave from the right ventricular inflow