(1)PCA pump allows patients to administer drugs by themselves, and the dosage is individualized.

(2)PCA avoids the obvious fluctuation of blood drug concentration.

(3)PCA reduces the workload of medical staff.

(4)PCA makes the use of painkillers timely and fast.

(5)PCA can reduce the occurrence of complications.

(6)PCA is beneficial to maintain the stability of physiological function.

(7)PCA is beneficial for patients to fully cooperate with treatment.

(8)PCA improves patients' satisfaction.