In spinal anesthesia which fibers are affected earliest?: (A) Sensory, (B) Motor, (C) Sympathetic preganglionic, (D) Vibration
Answer is C. Sympathetic preganglionic REF: Morgan 3rd e p-260 Order of blockade in spinal anesthesia: Autonomic preganglionic > Temperature > Prick > Pain > Touch > Pressure > Motor > Vibration