A 29-year-old woman, gravida 2 para 1, is in spontaneous labour at 39 weeks gestation. One hour after her cervix was 5 cm dilated, the membranes rupture spontaneously with clear liquor and the fetal heart rate falls to 80/min. Vaginal examination shows the cervix 6 cm dilated with the head at station minus 2, and a soft pulsatile structure is palpable in the vagina below the presenting part. Which one of the following is the most appropriate immediate management?
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