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NORMAL PULMONARY
ARTERY WAVEFORM |
- In the fetus the time to peak acceleration of the pulmonary artery is shorter than that of the aorta (1).
- After birth, the ductus arteriosus closes, and the time to peak velocity of the aorta becomes shorter than the pulmonary artery. This occurs due to decreased pulmonary vascular resistance and increased systemic vascular resistance after birth.
- The time to peak velocity is directly related to the blood pressure in the pulmonary circulation (2).
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REFERENCES |
- Machado MVL, Chita SC, Allan LD. Acceleration time in the aorta and pulmonary artery measured by Doppler echocardiography in the midtrimester normal fetus. Br Heart J 1987;58:15-18.
- Kitabatake A, Inoue M, Asao M et.al. Non-invasive evaluation of pulmonary hypertension by pulsed Doppler technique. Circulation 1983;68:302-309.