Final answer:
The motorcyclist with closed femur fractures and signs of shock should receive immobilization, bleeding control, and constant monitoring until emergency services arrive.
Step-by-step explanation:
A 21-year-old male involved in a motorcycle accident and exhibiting symptoms such as closed deformities to both femurs, pale skin, rapid and weak heart rate, and rapid and shallow respirations, requires immediate medical attention. After providing high-flow oxygen and ensuring spinal protection, it is critical to control bleeding if present and prevent shock. It is essential to immobilize the femur fractures with splints to stabilize the injury and reduce pain.
Emergency medical services should be called immediately, and the patient must be monitored continuously for any changes in condition while waiting for their arrival. The use of a helmet has provided some protection, but due to the serious nature of his injuries, a thorough medical evaluation is necessary to assess for potential complications such as head and traumatic brain injuries or damage to the spinal cord.