Cunningham K F, Aeberhardt L E, Wiggs B R, Phang P T
Department of Surgery, St. Paul's Hospital, University of British Columbia, Vancouver, Canada.
Am J Surg. 1994 May;167(5):547-9. doi: 10.1016/0002-9610(94)90255-0.
Energy expenditure varies with patient agitation. We asked whether energy expenditure determined from 5 minutes of measurement with less than 5% variation in minute-to-minute measurements (short mean) was similar to energy expenditure determined from a longer measurement period (long mean; average duration: 31 minutes). The difference between the short mean and the long mean was less than 5% for 42 of 47 patients in intensive care units; the difference was more than 10% for 2 patients. We also generated a statistical model simulating energy expenditure measurement variations of 5% to 20%, and calculated the necessary measurement durations required to achieve a 3% error in measurement. The statistical model showed that for energy expenditure variations of 5%, 10%, 15%, and 20%, the necessary durations of measurement to achieve a 3% error were 3, 9, 16, and 25 minutes, respectively. We conclude that energy expenditure may be determined using the mean of a 5-minute period of measurement if variation in that measurement is less than 5%. Larger variation requires longer periods of measurement.
能量消耗随患者的躁动而变化。我们探讨了由每分钟测量变化小于5%的5分钟测量（短均值）所确定的能量消耗是否与较长测量期（长均值；平均持续时间：31分钟）所确定的能量消耗相似。在重症监护病房的47名患者中，42名患者的短均值与长均值之间的差异小于5%；2名患者的差异超过10%。我们还生成了一个统计模型，模拟5%至20%的能量消耗测量变化，并计算出测量误差达到3%所需的必要测量持续时间。统计模型表明，对于5%、10%、15%和20%的能量消耗变化，测量误差达到3%所需的必要测量持续时间分别为3分钟、9分钟、16分钟和25分钟。我们得出结论，如果测量变化小于5%，则可使用5分钟测量期的均值来确定能量消耗。变化越大，所需的测量期越长。
