Definition of Anesthesia: Loss of feeling or awareness, as when an anesthetic is administered before surgery.
| Types of anesthesia | Effects | Methods of administration |
| Genera anesthesia | - Loss of sensory perception of the entire body - Produce unconsciousness | - IV infusion or inhalation |
| Regional anesthesia or nerve block anesthesia | - Loss of sensation over specific region of the body - No unconsciousness | - Spinal block - Epidural block - Regional block |
| Local anesthesia | - Loss of sensation over a small/limited area of the body - No unconsciousness | - Topical application or infiltration |
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