If a splinted limb has no pulse, what is the most likely reason?

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When a splinted limb has no pulse, the most likely cause is external compression from the splint itself. If the splint is too tight or placed too snugly, it can press on arteries and cut off blood flow to the part beyond the injury, causing the distal pulse to disappear. The correct move is to loosen the splint and, if needed, realign it so the limb is immobilized but not constricted. After loosening, recheck the distal pulse and also look for color, warmth, and cap refill. If the pulse returns, continue to monitor and keep the splint secure but not tight. If the pulse does not return or the limb remains cold or pale, seek urgent care. Bleeding or shock can crowds the whole circulation but doesn’t specifically explain an absent distal pulse from a splint; a fracture resolving immediately is unlikely; nerve entrapment would not typically cause a lost pulse.