The nurse is caring for a client with a fractured left femur. What signs indicate potential fat emboli

A. Increased partial pressure of arterial oxygen (PaO₂), reduced sensation in left leg or foot.
B. Left leg pain, dyspnea.
C. Bradycardia, skin bruises.
D. Cyanosis, decreased PaO₂.

简述卫生服务综合评价的目的和意义。