What action should be taken for a trauma patient with a laceration who has no radial pulses?

In the scenario of a trauma patient with a laceration and no radial pulses, applying a tourniquet is the most appropriate action. The absence of radial pulses suggests a potential serious loss of blood circulation, possibly due to significant bleeding or compromised blood flow from an extremity injury.

When a patient has a laceration that raises concern for arterial bleeding, applying direct pressure may not be sufficient if there is severe bleeding that cannot be controlled. Elevating the leg can help reduce blood flow to the injury but is often ineffective in the presence of arterial injury or severe hemorrhage. Beginning CPR is only warranted if the patient is in cardiac arrest, which is not indicated in the context of the provided information. Thus, the use of a tourniquet is critical in this scenario to effectively control life-threatening hemorrhage and stabilize the patient before further medical intervention can be provided.