Purpose To probe into the value of M-mode echocardiography and spectral Doppler echocardiography in diagnosing fetal atrial premature beats.Materials and Methods Echocardiography examinations were given to the seventy-three fetuses around 16-40 gestational weeks which were found suffering from fetal arrhythmia in the clinical examinations by using M-mode echocardiography and spectral Doppler. Thirty-two of them were screened out with fetal atrial premature beats, and their ultrasonic cardiograms were analyzed. The follow-up visits were later conducted.Results Among the thirty-two cases with fetal atrial premature beats, fourteen were attacked frequently, and the other eighteen were attacked accidentally. Two cases were documented with muscular ventricular septal defect. Apart from two missing cases, the rest thirty cases were found to be recovered from arrhythmia before or after birth in the follow-up visits. The disappearance rate of atrialpremature beats in the fetuses attacked frequently by the disease before birth was clearly lower than that in those attacked accidentally (P<0.05). Muscular ventricular septal defect in the two cases were found closed after birth. Conclusion M-mode echocardiography and spectral Doppler echocardiography, as non-invasive imagining techniques to take antenatal examination of fetal arrhythmia, have advantages such as reliable, direct, convenient and can be used repetitively, therefore can provide important information for clinical treatment and prognosis.%目的探讨M型超声及频谱多普勒超声心动图对胎儿房性期前收缩的诊断价值。资料与方法利用M型及频谱多普勒超声，对73例孕16~40周临床发现有胎儿心律失常的孕妇进行超声心动图检查，检出胎儿房性期前收缩32例，分析其超声心动图特征并进行追踪随访。结果32例胎儿房性期前收缩中，频发房性期前收缩14例，偶发18例，其中2例合并肌部室间隔缺损。32例胎儿除2例失访外，随访30例胎儿房性期前收缩在分娩前或出生后心率恢复正常，频繁发作的胎儿房性期前收缩产前消失率明显低于偶发房性期前收缩胎儿（P<0.05），2例肌部缺损于出生后闭合。结论 M型超声及频谱多普勒超声心动图作为产前检查胎儿心律失常的可靠无创影像技术，具有直观、简便、重复性好等优点，为指导临床治疗和判断预后提供重要信息。
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