Subhedar N V, Shaw N J
Department of Child Health, Liverpool Women's Hospital.
Arch Dis Child Fetal Neonatal Ed. 1996 Jul;75(1):F59-61. doi: 10.1136/fn.75.1.f59.
Intraobserver variation associated with the non-invasive assessment of pulmonary artery pressure (PAP), using measurement of pulmonary artery Doppler derived systolic time intervals, was investigated. Forty pairs of independent ultrasound examinations of the pulmonary artery were performed by a single observer in 20 preterm infants, median gestation 27 weeks (range 24-31 weeks). Median age at study was 17 days (range 1-47 days). paired measurements of acceleration time (AT), ratio between acceleration time and right ventricular ejection time (AT:RVET), corrected AT, and corrected AT:RVET were compared to assess intraobserver agreement. For the corrected AT:RVET ratio, the mean percentage difference between observations was -0.9% (95% confidence intervals -5.0 to 3.1%). The limits of agreement for the two measurements were -26.3 to 24.5%. The coefficient of repeatability was 25.4%. Variation for other indices was similar. Non-invasive assessment of PAP using Doppler derived systolic time intervals is associated with considerable intraobserver variation.
本研究调查了使用肺动脉多普勒导出的收缩期时间间隔测量法对肺动脉压（PAP）进行无创评估时的观察者内变异。一名观察者对20名早产婴儿进行了40对独立的肺动脉超声检查，这些婴儿的孕周中位数为27周（范围24 - 31周）。研究时的年龄中位数为17天（范围1 - 47天）。比较了加速度时间（AT）、加速度时间与右心室射血时间之比（AT:RVET）、校正后的AT以及校正后的AT:RVET的配对测量值，以评估观察者内一致性。对于校正后的AT:RVET比值，观察值之间的平均百分比差异为 -0.9%（95%置信区间为 -5.0%至3.1%）。两次测量的一致性界限为 -26.3%至24.5%。重复性系数为25.4%。其他指标的变异情况相似。使用多普勒导出的收缩期时间间隔对PAP进行无创评估与相当大的观察者内变异相关。
