Methods Medical records including outcomes of 71 patients with placenta praevia (23 with marginal praevia, 18 with partia praevia, 30 with total praevia) were reviewed retrospectively.

• 方法71例前置胎盘按胎盘位置分为边缘型组（23例）、部分型组（18例）和中央型组（30例），分析其临床表现和妊娠结局。