Final answer:
The EMT should observe for tissue swelling when splinting a possible fracture of the foot.
Step-by-step explanation:
When splinting a possible fracture of the foot, it is MOST important for the EMT to observe for tissue swelling. Tissue swelling is an important indicator of a fracture, as it can indicate damage to the soft tissues surrounding the bone.
Using a pillow as a splint or leaving the toes exposed may not provide adequate immobilization and support for a possible fracture.
Applying a pneumatic splint may be beneficial to minimize movement and relieve pain, but observing for tissue swelling is crucial in determining the severity of the injury and appropriate treatment.