Levanon D, Zhang M, Chen J D
Thomas N. Lynn Institute for Healthcare Research, Integris Baptist Medical Center, Oklahoma City, Oklahoma 73112, USA.
Dig Dis Sci. 1998 May;43(5):1023-30. doi: 10.1023/a:1018830801785.
The efficiency and efficacy of the electrogastrogram (EGG) involve a few practical factors, including recording length, sample size, and the characteristics of subjects. The aim of this study was to investigate the effect of these factors on the accuracy of EGG analysis. Gastric myoelectrical activity was recorded using electrogastrography in 24 subjects (ages 22-91 years) for 1 hr in the fasting state and 2 hr after a test meal. Computerized spectral analysis was performed to compute EGG parameters, including dominant frequency, dominant power, and the percentage of 2-4 cycles per minute (cpm) slow waves. A parameter called misinterpretation was defined to investigate the effect of recording length. The results were as follows: (1) Using the recording length of 1 hr in each state as a gold standard, the misinterpretation for the recording length of 30 min was 27% for the dominant frequency and 17% for the dominant power. When the recording length was reduced to 15 min, the misinterpretation increased to 61% for the dominant frequency and 38% for the dominant power. (2) With a sample size of 10 subjects and a recording length of 60 min, a statistically significant postprandial increase was observed in the dominant frequency and power, and a trend in the postprandial increase of the regularity of the EGG was noted. When the sample size increased to 24 subjects, a significant postprandial increase was found in all these parameters. (3) None of the EGG parameters exhibited any significant difference between the younger and older subjects or between men and women. In conclusion, a recording length of 30-60 min seems to be appropriate and produces reliable and predictable results. Age and gender do not affect any of the EGG parameters.
胃电图（EGG）的效率和功效涉及一些实际因素，包括记录时长、样本量和受试者特征。本研究的目的是调查这些因素对EGG分析准确性的影响。在24名受试者（年龄22 - 91岁）中，使用胃电图在空腹状态下记录1小时以及在试餐后2小时记录胃肌电活动。进行计算机频谱分析以计算EGG参数，包括主频、主功率以及每分钟2 - 4个周期（cpm）慢波的百分比。定义了一个名为误判的参数来研究记录时长的影响。结果如下：（1）以每种状态下1小时的记录时长作为金标准，30分钟记录时长的主频误判率为27%，主功率误判率为17%。当记录时长缩短至15分钟时，主频误判率增至61%，主功率误判率增至38%。（2）样本量为10名受试者且记录时长为60分钟时，观察到餐后主频和功率有统计学意义的增加，并且注意到EGG规律性餐后增加的趋势。当样本量增加到24名受试者时，所有这些参数均发现餐后有显著增加。（3）EGG参数在年轻与年长受试者之间或男性与女性之间均未表现出任何显著差异。总之，30 - 60分钟的记录时长似乎是合适的，并且能产生可靠且可预测的结果。年龄和性别不会影响任何EGG参数。
