35岁，GJ。，宫内孕42周。LOA，临产3 小时，宫缩50秒/3 ~ 5分钟，宫口开大 5cm,先露-1，破膜时羊水HI度粪染，持续 胎心监护提示频发变异减速。对该产妇首先 采取的处理是(       )

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