Kasahara T
Department of Obstetrics and Gynecology, Nippon Medical School, Japan.
Nihon Ika Daigaku Zasshi. 1991 Oct;58(5):577-86. doi: 10.1272/jnms1923.58.577.
Effects of a 5-second external vibratory acoustic stimulation (VAS, 500 Hz, 75 db) were studied in 155 healthy pregnant women from 34 to 41 weeks' gestational age on the fetal heart rate and gross fetal body movement. Fetal behavioral states were also studied in 88 out of the 155 patients. The following results and conclusions were obtained. 1) VAS induced significant increases in the fetal heart rate baseline, the mean amplitude, the mean duration, and the mean time spent % of fetal heart rate accelerations and gross fetal body movements. 2) VSA induced significant changes in fetal behavioral states at states 1F and 3F, but no changes in states 2F and 4F. 3) Reaction to VAS was recognized also in the low birth weight (less than 2,500 g) group, but the duration of the reaction was shorter than that in the normal (greater than or equal to 2,500 g) group. 4) By lowering the incidence of false non reactive NST with VAS test, it was possible to predict the fetal prognosis better than NST alone. 5) Inasmuch as VAS changed the fetal behavioral state from resting phase to active phase, the use of VAS in addition to NST was very helpful in more accurate understanding of fetal heart rate monitoring.
对155名孕龄在34至41周的健康孕妇进行了5秒外部振动声学刺激（VAS，500赫兹，75分贝）对胎儿心率和胎儿整体大运动的影响研究。还对155名患者中的88名进行了胎儿行为状态研究。获得了以下结果和结论。1）VAS使胎儿心率基线、平均振幅、平均持续时间以及胎儿心率加速和胎儿整体大运动的平均时间占比显著增加。2）VSA使1F和3F状态下的胎儿行为状态发生显著变化，但2F和4F状态下无变化。3）低体重（小于2500克）组对VAS也有反应，但反应持续时间比正常（大于或等于2500克）组短。4）通过VAS试验降低假无反应型NST的发生率，比单独使用NST能更好地预测胎儿预后。5）由于VAS将胎儿行为状态从静息期转变为活跃期，在NST之外使用VAS对更准确理解胎儿心率监测非常有帮助。
