Abstract
In the modern anesthesia machine, there are various safety checks in place to help prevent the delivery of a hypoxic gas mixture to the patient. They include the pin index safety system (PISS), diameter index safety system (DISS), failsafe valve, oxygen-nitrous oxide proportioning system, oxygen supply failure alarm, flowmeter sequence, and, most distally, the oxygen analyzer. The PISS is a feature in the high-pressure system. The DISS, failsafe valve, and oxygen failure alarm are in the intermediate-pressure system. The flowmeters, proportioning system, and oxygen analyzer are in the low-pressure system. This chapter undertakes a discussion of the distinct role of each feature and their limitations.
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