What is the first step in treating a sprain according to first aid procedures?

Applying an ice pack for 20-30 minutes is the first step in treating a sprain according to first aid procedures. Ice is essential in reducing swelling and alleviating pain immediately after the injury occurs. The cold temperature constricts blood vessels, which helps minimize inflammation and slows the bleeding in the area. This initial treatment is part of the R.I.C.E. method, which stands for Rest, Ice, Compression, and Elevation.

When treating a sprain, using ice effectively controls the body's inflammatory response and can significantly enhance the recovery process. It's crucial that the ice pack is applied for a limited duration—in this case, 20-30 minutes—to avoid frostbite and other cold-related injuries.

The other choices do not align with recommended first aid practices. Applying heat can increase blood flow and swelling at a time when the goal is to reduce inflammation. Massaging the injured area could further irritate the tissues and exacerbate damage. Completely immobilizing the joint without any intervention may hinder the healing process, as some movement may be necessary to promote blood flow and recovery, although extreme care should be taken to avoid causing further harm.