Comparison of blood velocity waveform indices recorded by pulsed Doppler and continuous wave Doppler in the umbilical artery

✍ Scribed by J. M. G Van Vugt; C. J Ruissen; S. J Nienhuis; H. J Hoogland; J de Haan

• Publisher: John Wiley and Sons
• Year: 1988
• Tongue: English
• Weight: 332 KB
• Volume: 16
• Category: Article
• ISSN: 0091-2751
• DOI: 10.1002/jcu.1870160807

✦ Synopsis

A comparison was made between the AB ratio, resistance index (RI), and pulsatility index (PI 1, calculated from tracings obtained by pulsed Doppler (PD) and continuous wave ( C W ) Doppler devices in 14 uncomplicated singleton pregnancies. The AB ratio, RI, and PI were a slightly higher for the CW Doppler compared to the PD system, although not significantly ( p = 0.18, p = 0.21, and p = 0.44, respectively). The difference in signal to noise ratio (SIN ratio) between the PD and CW Doppler systems was felt to be the reason for the discrepancy in the calculated velocity waveform indices. Indexing Words: Pulsatility index Resistance index AB ratio Velocity waveform Pulsed Doppler Continuous wave Doppler Continuous wave (CW) and pulsed Doppler (PD) systems are both used in the study of fetal hemodynamics. Both CW and pulsed Doppler devices have their advantages and disadvantages.' Commonly accepted is the use of pulsed Doppler devices when recording blood flow velocities in the fetal aorta, whereas in the umbilical artery both techniques are used. Yet systematic data on the comparison of both techniques in a clinical setting are lacking. The aim of the present study was to investigate the agreement or disagreement of the blood velocity waveform indices, calculated from recordings in the umbilical artery by means of CW and pulsed Doppler devices.

MATERIAL AND METHODS

Patients

Seventeen patients were chosen at random from the outpatient obstetric clinic by the attending From the