Through which method is nitrous oxide commonly administered to patients?

Nitrous oxide is commonly administered to patients through inhalation, typically using a mask. This method allows for quick absorption into the bloodstream when the gas is inhaled, providing effective sedation and analgesia during medical procedures. The mask ensures a steady supply of nitrous oxide mixed with oxygen, allowing for precise control over the dosage and enabling healthcare providers to monitor the patient's response easily. This inhalation method is favored for its rapid action and the ability to quickly adjust or discontinue the gas as necessary, making it ideal for various diagnostic and minor surgical procedures. Other methods listed, such as direct IV injection, skin patches, or oral ingestion, do not align with the standard practice for administering nitrous oxide in clinical settings.