What action should be taken to a tourniquet (TQ) after achieving return of radial pulses in a casualty with hemorrhagic shock?

In a situation where a tourniquet has been applied due to hemorrhagic shock and radial pulses are successfully restored, the appropriate action is to tighten the tourniquet. This is important because while the restoration of pulses may indicate that blood flow is returning to the extremity, it does not guarantee that bleeding is effectively controlled or that the tourniquet is functioning properly. Tightening the tourniquet ensures that any potential ongoing bleeding is further managed, which is critical in stabilizing the casualty until definitive medical care can be provided.

Leaving the tourniquet unchanged might not provide adequate pressure to stop the bleeding entirely, while loosening or removing it could allow renewed blood flow which risks re-opening any superficial vessels that might still be bleeding. Therefore, ensuring that the tourniquet remains effective by tightening it if necessary is the best course of action in this scenario.