Which gas is used in anesthesia for its pain-relieving effects?

Nitrous oxide, often referred to as laughing gas, is widely used in anesthesia due to its analgesic (pain-relieving) properties. It serves as a sedative and helps to alleviate pain during medical procedures, making it particularly useful in dentistry and for minor surgical interventions. The gas is inhaled, allowing for rapid onset of effects and a quick recovery, which is beneficial for both patients and practitioners.

Additionally, nitrous oxide can produce feelings of euphoria, which can help to ease anxiety in patients undergoing various medical procedures. While oxygen is essential for the body and carbon monoxide is harmful, they do not possess the desired analgesic qualities. Ethylene, while it has historical use in anesthesia, is not commonly utilized today for its pain-relieving effects, as nitrous oxide has proven to be safer and more effective. Thus, nitrous oxide is the preferred choice for achieving both sedation and pain relief in a medical setting.