Measurement uncertainty in pulmonary vascular input impedance and characteristic impedance estimated from pulsed-wave Doppler ultrasound and pressure: clinical studies on 57 pediatric patients

Tian et al. (2010) conducted an observational in Pulmonary hypertension (n=57). Pulsed-wave Doppler ultrasound and pressure vs. Four different computation methods was evaluated on Total impedance uncertainty (systematic and random error contributions). Pulsed-wave Doppler ultrasound estimation of pulmonary vascular input impedance has large systematic error contributions, with uncertainty remaining high at high harmonics despite optimal computation methods.