Study limitations include lack of double-blinding or placebo control and failure to establish the optimal doses of magnesium sulfate and nifedipine. 研究局限包括缺乏双盲或安慰剂对照，没有确定硫酸镁及硝苯地平的最佳剂量。
In the magnesium sulfate group, mild and seere maternal aderse effects were significantly more frequent than in the nifedipine group. 在硫酸镁治疗组，产妇轻度与重度副作用明显多于硝苯吡啶治疗组。
