In relation to DISS, what does it prevent?

• A. Cylinder misconnection
• B. Pipeline pressure drops
• C. Gas leakage
• D. Flow meter malfunctions

Answer: (A)

DISS, or Diameter Index Safety System, is designed specifically to prevent cylinder misconnection in gas delivery systems used for anesthesia. Each medical gas has its own unique connector, which is differentiated by the diameter of the outlet, ensuring that only compatible gas cylinders can connect to the correct delivery system. This system is critical for maintaining patient safety, as it minimizes the risk of administering the wrong gas during procedures, which could have serious medical consequences.

While DISS is effective in preventing misconnection, the other options address different safety or operational concerns. Pipeline pressure drops pertain to the integrity of the pipeline system rather than connections at the cylinder. Gas leakage is often managed through proper sealing and maintenance rather than connector design. Flow meter malfunctions are a separate issue related to the functioning of the flow meter itself, which is not influenced by DISS. Therefore, the primary function of DISS is to prevent misconnection, ensuring that each gas is used correctly and safely.