What is an example of a regional anesthesia?

An example of regional anesthesia is spinal anesthesia, which involves the injection of anesthetic agents into the spinal canal. This technique blocks nerve signals in a specific region, providing pain relief and anesthesia to the lower half of the body while allowing the patient to remain conscious. Spinal anesthesia is commonly used for surgeries involving the lower limbs, pelvis, and abdominal procedures.

In contrast, the other choices provided represent different categories of anesthesia or analgesia. Isoflurane is a volatile anesthetic agent used for general anesthesia, not for regional blockades. Propofol is a sedative-hypnotic agent often used for induction and maintenance of general anesthesia, but it does not provide regional anesthesia. Fentanyl is an opioid analgesic used for pain management and can be part of a multimodal anesthesia approach but does not constitute regional anesthesia by itself. Therefore, spinal anesthesia is the definitive example of regional anesthesia.