Nitric Oxide vs. Nitrous Oxide: Different Gases, Different Roles
They are not the same.
| Property | Nitric Oxide (NO) | Nitrous Oxide (N₂O) |
|---|---|---|
| Common Name | Nitric oxide | Laughing gas |
| Chemical Formula | NO | N₂O |
| Primary Role | Endogenous signaling molecule: vasodilation, neurotransmission, immune defense | Anesthetic/analgesic gas |
| Clinical Use | Inhaled NO for PPHN in neonates; research for ARDS, PAH | Dental/surgical sedation, labor analgesia |
| Safety | Toxic at high doses (methemoglobinemia) | Safe when administered properly; abuse risk (asphyxia, B12 deficiency) |
NO is a radical gas produced by endothelial cells; N₂O is a stable anesthetic gas. Confusing them is a critical error.
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