Ryo Eiji, Kamata Hideo
Department of Obstetrics and Gynecology, Teikyo University, School of Medicine, Kaga, Itabashi-ku, Tokyo, Japan.
J Matern Fetal Neonatal Med. 2012 Dec;25(12):2629-32. doi: 10.3109/14767058.2012.704449. Epub 2012 Jul 16.
Fetal Movement Acceleration Measurement (FMAM) recorder was developed to facilitate gross fetal movement counting. The aim was to assess its reliability.
Using the recorder, six pregnant women recorded fetal movements by themselves when they slept at their home weekly from 30 weeks to term. The recorder has 2 acceleration sensors; 1 for fetal movement (FM sensor) and another for maternal movement (MM sensor). Before sleeping, each subject attached the FM sensor to her abdomen, and the MM sensor to her thigh. All the recorded data were divided into 10-sec epochs, and presence of fetal movements was judged for all epochs (total epoch). The epoch was judged as positive for movement (positive epoch) when the FM sensor detected abdominal wall oscillations and the MM sensor did not detect maternal movements. The percentage of positive epoch number to total epoch and the maximum consecutive negative epoch number was calculated.
The mean percentage was approximately 20-25% at 30-34 weeks and 10-15% at 35-38 weeks. The negative epoch number linearly increased after approximately 33-34 weeks of gestation.
The FMAM recorder was reliable for long-duration recording of gross fetal movements at home.
开发胎动加速测量（FMAM）记录仪以方便进行粗略的胎动计数。目的是评估其可靠性。
使用该记录仪，6名孕妇从孕30周直至足月，每周在家睡觉时自行记录胎动情况。该记录仪有2个加速度传感器；1个用于检测胎动（FM传感器），另一个用于检测母体活动（MM传感器）。睡觉前，每位受试者将FM传感器贴于腹部，将MM传感器贴于大腿。所有记录的数据被分成10秒的时间段，对所有时间段（总时间段）判断是否存在胎动。当FM传感器检测到腹壁振荡且MM传感器未检测到母体活动时，该时间段被判定为胎动阳性（阳性时间段）。计算阳性时间段数占总时间段数的百分比以及最大连续阴性时间段数。
孕30 - 34周时平均百分比约为20 - 25%，孕35 - 38周时为10 - 15%。妊娠约33 - 34周后阴性时间段数呈线性增加。
FMAM记录仪在家中对长时间粗略胎动记录是可靠的。
