In a client with a thermal burn presenting with vital signs of 70/40 blood pressure and difficulty in finding pedal pulses, what is the nurse's priority action?

In cases of thermal burns, particularly when accompanied by hypotension (as indicated by a blood pressure of 70/40) and difficulty in locating pedal pulses, the primary concern is often hypovolemic shock due to fluid loss. Burns can lead to significant fluid shifts and loss, which directly affects blood volume and circulation.

Starting an intravenous fluid line is critical for immediate management. Administering fluids helps to restore vascular volume, improve circulation, and enhance tissue perfusion. This is essential in preventing further complications associated with inadequate blood supply, such as organ failure. Fluid resuscitation is a foundational intervention in burn care, as it can stabilize blood pressure and improve vital signs promptly.

While checking pulses with a Doppler device and obtaining a complete blood count or an electrocardiogram can provide valuable information, these actions do not address the immediate need to stabilize the client’s hemodynamics. The priority in this scenario is to manage the shock state through intravenous fluid therapy to ensure the patient's safety and survival.