School of Health Sciences, University of Newcastle, Australia.
J Am Heart Assoc. 2013 Aug 20;2(4):e000203. doi: 10.1161/JAHA.113.000203.
Systolic ankle pressures are routinely measured as part of an ankle-brachial index to screen for lower extremity peripheral arterial disease. Despite widespread use of this measurement, the effect of premeasurement duration of rest on the magnitude, or reliability of the ankle systolic pressure measurement is unknown. This study assessed the effect of premeasurement rest duration on systolic ankle pressures.
One hundred and forty participants meeting guidelines for peripheral arterial disease screening volunteered for this study. Following 5 minutes of rest in the supine horizontal position, ankle systolic pressures of the lower extremity were taken. Measurements were repeated at 10 and 15 minutes. Testing was repeated 7 to 10 days later. A significant drop in ankle pressure of 5.02 mm Hg occurred between 5 and 10 minutes (P=0.004). No significant change occurred between 10 and 15 minutes (mean change 0.15 mm Hg, P=0.99). Presence of diabetes was associated with a smaller drop between 5 and 15 minutes (mean change 1.85 mm Hg) and predicted 13.4% of the variance in change in ankle pressure (β=-3.61, P=0.0001). Test-retest reliability after 5 minutes was excellent (intraclass correlation coefficient: 0.84, 95% CI: 0.76 to 0.91) however increased for measurements taken at 10 and 15 minutes (intraclass correlation coefficient: 0.89 95% CI: 0.83 to 0.94 and 0.89 95% CI: 0.82 to 0.93).
Results suggest ankle systolic pressures stabilise after 10 minutes of rest. Longer periods of premeasurement rest did not improve reliability significantly. Though diabetes affects ankle pressure changes after rest, further investigation is required to identify the cause.
踝臂指数（ankle-brachial index，ABI）是一种常规的检测方法，用于筛查下肢外周动脉疾病。尽管这种测量方法应用广泛，但测量前休息时间对踝部收缩压测量的幅度或可靠性的影响尚不清楚。本研究评估了测量前休息时间对踝部收缩压的影响。
符合外周动脉疾病筛查指南的 140 名参与者自愿参加了这项研究。在仰卧位休息 5 分钟后，测量下肢的踝部收缩压。10 分钟和 15 分钟时重复测量。7 至 10 天后重复测试。踝部压力在 5 分钟至 10 分钟之间显著下降 5.02mmHg（P=0.004）。10 分钟至 15 分钟之间无显著变化（平均变化 0.15mmHg，P=0.99）。患有糖尿病与 5 分钟至 15 分钟之间的压力下降幅度较小（平均变化 1.85mmHg）有关，并且可以预测踝部压力变化的 13.4%（β=-3.61，P=0.0001）。5 分钟后的测试-再测试可靠性极好（组内相关系数：0.84，95%置信区间：0.76 至 0.91），但在 10 分钟和 15 分钟时增加（组内相关系数：0.89，95%置信区间：0.83 至 0.94 和 0.89，95%置信区间：0.82 至 0.93）。
结果表明，踝部收缩压在休息 10 分钟后趋于稳定。较长的测量前休息时间并不能显著提高可靠性。尽管糖尿病会影响休息后的踝部压力变化，但需要进一步研究以确定原因。
