Final answer:
In this scenario, a patient with a left femur fracture is experiencing severe pain and non-palpable pulses. These symptoms indicate compartment syndrome, and the next step should be to call the physician and prepare for fasciotomy.
Step-by-step explanation:
In this scenario, the patient with a left femur fracture is presenting with severe pain, a firm thigh, and non-palpable pulses. These symptoms are consistent with compartment syndrome, which is a surgical emergency. Therefore, the next step should be to call the physician and prepare for fasciotomy.