Definition: Refers to the infusion of drugs through veins, which act on the central nervous system through blood circulation to produce general anesthesia.

Advantages: No need for trans-airway administration and no gas pollution

Indications: Used for minor surgeries that do not require muscle relaxation, outpatient and day clinic surgeries (the operation time is generally within 30 minutes)

Injection site: dorsal hand vein, radial vein, median cubital vein

Definition: A method of inhaling anesthetic gas into the lungs, entering the blood circulation through the alveoli, and reaching the central nervous system to produce anesthesia.

Advantages: The patient is comfortable, the medication is highly controllable, and it can meet the surgical needs of all parts of the body.

Indications: All surgeries

Inhalation site: alveoli

Definition: Injecting local anesthetic into the subarachnoid space to produce varying degrees of blockade in the spinal nerve roots, dorsal root ganglia and surface parts of the spinal cord.

Puncture site: subarachnoid space (often in the space between spinous processes of waist 3 and 4)

sacral anesthesia

Definition: combined subarachnoid space and epidural space block

Puncture site: Lumbar 2-3 or Lumbar 3-4 spinous process space