You are the flight nurse responding to a 30-year-old male who was involved in a high-speed motor vehicle collision. Upon arrival, you find the patient conscious but in severe pain, with deformity and instability noted to the pelvis. What should be your immediate priority in managing this patient's pelvic injury?
Initiate IV fluids to manage shock
Immobilize the patient on a spinal board
Provide manual traction to the lower extremities
Apply a pelvic binder to stabilize the pelvis