Final answer:
Immediate surgical intervention is required based on the client's condition.
Step-by-step explanation:
Based on the given information, the potential medical action needed for the client is immediate surgical intervention. The client's condition has significantly deteriorated, showing signs of shock and drop in blood pressure. Administering pain relief medication or applying pressure on the wound would not address the underlying medical issue. Monitoring oxygen levels continuously may be necessary during and after the surgical intervention.