Final answer:
The first action a nurse should take when FHR decelerations are observed is to reposition the client to improve blood flow and fetal oxygenation. Monitoring FHR and maternal vitals and adjusting the oxytocin infusion are also crucial steps.
Step-by-step explanation:
A nurse caring for a client in labor who is experiencing fetal heart rate (FHR) decelerations should first assess the situation. However, it is essential to mention that in sceneries where the FHR monitor shows decelerations, the first intervention would typically be to reposition the mother to improve uteroplacental blood flow, ensuring that the fetus gets enough oxygen. It's also necessary to review the labor progression, evaluate the mother's vital signs, and consider tocolytic therapy if needed to decrease uterine activity and improve fetal oxygenation. Close monitoring of vital signs, FHR, and contraction patterns is necessary, and the healthcare practitioner may need to reduce or discontinue the oxytocin infusion. Furthermore, it's also critical that the obstetric team be informed and ready to intervene if the decelerations suggest the need for urgent delivery.