Pin code index of N2O is-
**Core Concept**
Nitrous oxide (N2O) is a commonly used inhalational anesthetic agent. The pin index system is a safety mechanism designed to prevent accidental disconnection of the anesthesia circuit by ensuring that the yoke on the anesthesia machine can only be connected to the correct type of cylinder. Each anesthetic gas has a unique pin configuration, which corresponds to a specific pin index number.
**Why the Correct Answer is Right**
The correct pin index for N2O is 3. This is because N2O cylinders have a specific pin configuration that corresponds to a pin index of 3. When an N2O cylinder is connected to an anesthesia machine, the yoke on the machine can only be secured if it has a pin index of 3. This prevents accidental disconnection of the N2O cylinder during anesthesia administration.
**Why Each Wrong Option is Incorrect**
* **Option A:** This is incorrect because the pin index for oxygen (O2) is typically 2, not 3.
* **Option B:** This is incorrect because the pin index for nitric oxide (NO) is typically 8, not 3.
* **Option C:** This is incorrect because the pin index for other anesthetic gases, such as desflurane or sevoflurane, is not 3.
**Clinical Pearl / High-Yield Fact**
It's essential to verify the pin index of anesthetic cylinders before connecting them to the anesthesia machine to prevent accidental disconnection and ensure patient safety.
**Correct Answer:** C.