Final answer:
In the context of an un-reassuring fetal heart rate during labor, administering oxygen to the mother is a common initial response aimed at improving fetal oxygenation. Decision on further interventions should be made by healthcare professionals based on continuous monitoring and the stage of labor.
Step-by-step explanation:
The question pertains to the appropriate management of a woman in labor exhibiting an un-reassuring fetal heart rate (FHR). Among the provided options, administering oxygen is usually considered a primary immediate response to help optimize fetal oxygenation while further assessment and interventions are planned. Tocolytics, while used for stopping preterm labor, may not be appropriate in this context as they would decrease uterine contractions and could potentially worsen the fetal status. Encouraging pushing is typically advised during the active pushing phase of the second stage of labor, but may not be suitable if there is fetal distress. An amniotomy, or artificial rupture of membranes, could potentially expedite labor but also carries risks and would not directly address fetal distress.
Supplemental oxygen is provided because it can increase the oxygen available to the fetus, which may alleviate fetal distress as indicated by an un-reassuring FHR pattern. However, each situation is unique, and a healthcare professional will consider the specifics of the case, including the stage of labor and the nature of the FHR tracing, before deciding on an intervention. It is critical that such decisions are made by a qualified healthcare provider based on real-time assessment and monitoring of both mother and fetus.