What may cause a cross connection of supply pipelines in the pipeline supply?

• A. Leakage from valves
• B. DISS malfunction
• C. High pressure inconsistencies
• D. Improper hose connection

Answer: (B)

A cross connection of supply pipelines can occur due to a malfunction in the Diameter Index Safety System (DISS). The DISS is designed to prevent the interconnection of medical gas piping by using differing sizes and threads for different gases. If the system malfunctions, it could potentially allow gases to mix or connect improperly, leading to a cross connection. This situation can create significant safety hazards, as a wrong gas could be delivered to the patient, affecting their care.

Other options, while they may present certain risks or problems within the anesthesia machine, do not directly lead to cross connections in the same manner. For instance, leakage from valves typically results in loss of gas or pressure issues but not a cross connection between different gas supplies. High pressure inconsistencies could affect delivery system performance or monitoring but generally do not cause a cross connection. Improper hose connections, while they can lead to problems, would generally not be the result of a systemic malfunction like the DISS, and would more likely result from user error or oversight rather than an inherent issue within the safety mechanisms of the system.