Department of Obstetrics and Gynaecology, Royal Blackburn Hospital, East Lancashire Hospitals NHS Trust, Haslingden Road, Blackburn, BB2 3HH, UK.
Arch Gynecol Obstet. 2011 Mar;283 Suppl 1:9-11. doi: 10.1007/s00404-010-1563-5. Epub 2010 Jul 9.
Auscultation of the fetal heart is a common event in antenatal care, in early pregnancy it may be associated with false negative results, which require ultrasound scan to confirm fetal viability.
We studied 197 women in early pregnancy to determine the gestational age at which the fetal heart can be reliably identified and the factors which determined the accuracy of the test.
The proportion of successful auscultations increased with advancing gestation (p < 0.001). There was no effect of maternal body mass index or the level of midwifery experience.
For a sensitivity of 90%, the fetal heart should be auscultated after 13 week gestation. If a sensitivity of 80% is acceptable the fetal heart can be auscultated after 12 + 1 week gestation.
胎儿心脏听诊是产前检查中的常见事件，在孕早期可能与假阴性结果相关，需要超声扫描来确认胎儿的活力。
我们研究了 197 名早期妊娠的妇女，以确定可以可靠识别胎儿心脏的孕龄以及确定测试准确性的因素。
成功听诊的比例随妊娠进展而增加（p<0.001）。产妇体重指数或助产士经验水平没有影响。
灵敏度为 90%时，应在妊娠 13 周后听诊胎儿心脏。如果可接受的灵敏度为 80%，则可在妊娠 12+1 周后听诊胎儿心脏。
