A nulliparous woman is in the active phase of labor and her cervix has progressed to 6 cm dilatation. The nurse caring for this woman evaluates the external monitor tracing and notes the following: decrease in FHR shortly after onset of several uterine contractions returning to baseline rate by the end of the contraction; shape is uniform. Based on these findings the nurse should:

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Change the womans position to her left side
Document the finding on the womans chart
Perform a vaginal examination to check for cord prolapse
Notify the physician