Just immobilize the wrist in a splint brace for a few weeks, and let the tendons heal. Use an NSAID to control inflammation
the complications of carpal tunnel syndrome happen because people continue to use (and thus, continually injure) the swollen and inflamed tendon by using the hand.
Anatomy lesson:
the tendons that control the fingers go through a small cartilage opening through the carpals of the hand, called the carpal tunnel. This tunnel is only just slightly larger than the tendons that slide around inside it. When you injure the tendons that flex your fingers, the site of injury experiences inflammation, which is a normal part of the healing process. However, if you are a total dipshit, and continue to use the hand (because PRAISE MAMMON! You have to work to eat and can't take sick days!), the swollen part gets squeezed as it moves through the carpal tunnel, causing erosion and pinch injuries on the tendon, and on the walls of the tunnel itself. This causes a vicious escalation of inflammation and injury in the joint and tendons, leading to tears in the sheath of the tendon, and eventually adhesions (where the tendon sheath literally fuses with the tunnel wall!). Adhesions require surgery to correct. You do not want them. No sir, you do not.
SO-- Care plan for early tendon injury of hand:
Immobilize hand to prevent inflamed tendon from sliding around through the narrow constriction of the carpal tunnel.
Use an nsaid to control the inflammation response to avoid further escalating injury to the joint. (this also has the side effect of pain relief, but we really want the anti-inflammatory action here.)
Allow several weeks for tendon and or, carpal tunnel lining to heal after injury before removing splint brace.
Perform range of motion exercises with the hand gently until full ROM is restored. (this also takes time. Dont force the motion of the joint!! that will only re-injure the tendons!)