What is the priority action for a nurse assessing a post-cesarean section client with a heart rate of 110/min and anxiety?

Monitoring the oxygen saturation using a pulse oximeter is the most appropriate priority action in this scenario. A heart rate of 110 beats per minute can indicate tachycardia, which may be a sign of anxiety, pain, or even a potential complication such as hypoxia or hemorrhage following surgery. Given the context of a post-cesarean section, the nurse must ensure that the client is adequately oxygenated, as any compromise in oxygen saturation can lead to more severe complications.

While assessing for lower extremity warmth and redness is important in evaluating for deep vein thrombosis, it is not as immediately urgent as ensuring the client is receiving enough oxygen. Instructing the client in relaxation breathing techniques can help manage anxiety, but it does not address the potential underlying issue related to oxygenation. Offering prescribed pain medication may be necessary if pain is contributing to anxiety, but it is essential to first confirm that the client’s respiratory status is stable. Thus, obtaining an oxygen saturation reading helps prioritize the client's safety and well-being by ensuring that they are breathing adequately after surgery.