Assessment of pulmonary artery pulse wave velocity in children: An MRI pilot study

Chuen Y. Poon, Julie M. Edwards, C. John Evans, Ashley D. Harris, Beverly Tsai-Goodman, Charlotte E. Bolton, John R. Cockcroft, Richard G. Wise, Sailesh Kotecha*

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    9 Citations (Scopus)

    Abstract

    Purpose: To assess the feasibility of measuring pulmonary artery (PA) pulse wave velocity (PWV) in children breathing ambient air and 12% oxygen. Methods: Velocity-encoded phase-contrast MR images of the PA were acquired in 15 children, aged 9-12. years, without evidence of cardiac or pulmonary diseases. PWV was derived as the ratio of flow to area changes during early systole. Each child was scanned twice, in air and after at least 20. minutes into inspiratory hypoxic challenge. Intra-observer and inter-observer variability and repeatability were also compared. Results: PA PWV, which was successfully measured in all subjects, increased from 1.31. ±. 0.32. m/s in air to 1.61. ±. 0.58. m/s under hypoxic challenge (p = 0.03). Intra- and inter-observer coefficients of variations were 9.0% and 15.6% respectively. Good correlation within and between observers of r. =. 0.92 and r = 0.72 respectively was noted for PA PWV measurements. Mean (95% limit of agreement) intra- and inter-observer agreement on Bland-Altman analysis were 0.02. m/s (-0.41-0.38. m/s) and -0.28. m/s (-1.06-0.49. m/s). Conclusion: PA PWV measurement in children using velocity-encoded MRI is feasible, reproducible and sufficiently sensitive to detect differences in PA compliance between normoxia and hypoxia. This technique can be used to detect early changes of PA compliance and monitor PAH in children.

    Original languageEnglish
    Pages (from-to)1690-1694
    Number of pages5
    JournalMagnetic Resonance Imaging
    Volume31
    Issue number10
    DOIs
    Publication statusPublished - Dec 2013

    Keywords

    • Children
    • Hypoxia
    • Pulmonary artery
    • Pulse wave velocity
    • Velocity-encoded MRI

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