Because spinal anesthesia blocks innervation of the bladder, administration large amounts of intravenous fluids may cause bladder distention, and a urethral catheter may be carried.

• 因脊髓麻醉阻滞了膀胱的神经支配，大量静脉输液会引起膀胱膨胀，因此可能需要插导尿管。