Theron G B, Theron A M, Odendaal H J, Bunn A E
Department of Obstetrics and Gynaecology, Stellenbosch University, Tygerberg, W Cape.
S Afr Med J. 2005 Jan;95(1):62-4.
To determine the accuracy of the resistance index (RI) of flow velocity waveforms of the umbilical artery measured using a newly developed PC-based continuous wave Doppler device (Umbiflow) with regard to systematic and random variations when compared with a commercial standard (Vasoflow).
A cohort study.
The fetal evaluation clinic (FEC) at Tygerberg Hospital.
Patients referred to the FEC at Tygerberg Hospital with suspected chronic placental insufficiency.
The correlation coefficients indicating the strength of the relationship between the two devices and their agreement using the method of Bland and Altman.
A total of 248 patients were studied. The mean RIs of the first Doppler assessment were 0.69 (standard deviation (SD) 0.11) and 0.67 (SD 0.11) using the Vasoflow and Umbiflow respectively. The Pearson's correlation coefficient comparing the RI of the first test was 0.85. The degree of agreement between the two methods was excellent, the mean differences being very small (< 0.024) with tight confidence intervals. One hundred and ninety-four patients (78.2%) of patients remained in the same percentile category with both the Vasoflow and Umbiflow.
The accuracy of the Umbiflow has been proved. A non-significant trend towards slightly lower values needs to be considered. This could be addressed by changing the percentile cut-off to slightly lower values.
使用新开发的基于个人电脑的连续波多普勒设备（脐血流仪）测量脐动脉血流速度波形的阻力指数（RI），与商业标准设备（血管血流仪）相比，确定其在系统和随机变化方面的准确性。
队列研究。
泰格堡医院的胎儿评估诊所。
转诊至泰格堡医院胎儿评估诊所、疑似慢性胎盘功能不全的患者。
使用布兰德和奥特曼方法，相关系数表明两种设备之间关系的强度及其一致性。
共研究了248例患者。首次多普勒评估时，使用血管血流仪和脐血流仪测得的平均阻力指数分别为0.69（标准差[SD]0.11）和0.67（SD 0.11）。比较首次测试阻力指数的皮尔逊相关系数为0.85。两种方法的一致性程度极佳，平均差异非常小（<0.024），置信区间很窄。194例患者（78.2%）使用血管血流仪和脐血流仪时处于相同的百分位类别。
脐血流仪的准确性已得到证实。需要考虑值略低的不显著趋势。这可以通过将百分位临界值改为略低的值来解决。
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