Machine Self-Tests

Many newer anesthesia workstations incorporate technology that allows the machine to automatically or manually go through a series of self-tests to check for functionality of electronic, mechanical, and pneumatic components.^{[20] [22] [23] [35] [36]} Tested components commonly include the gas supply system, flow control valves, the circle system, ventilator, and in the case of the Datex-Ohmeda ADU, the Aladin Cassette Vaporizer.^{[35] [36] [52]} The comprehensiveness of these self-diagnostic tests varies from one model and manufacturer to another. If these tests are to be employed, users must read and strictly follow all of the manufacturer's recommendations. Although a thorough understanding of what the particular workstation's self-tests include is very helpful, this information is often difficult to obtain and may vary greatly between devices.

An important warning is in order for self-tests on systems with add-on vaporizers, such as the Dräger Fabius and Narkomed 6000. An add-on vaporizer does not become a part of an anesthesia workstation's gas flow stream until the concentration control dial is turned to the on position. To detect internal vaporizer leaks on this type of a system, the leak test portion of the self-diagnostic program must be repeated separately with each individual vaporizer turned to the on position. If this precaution is not taken, a large leak, such as that from a loose filler cap or cracked fill indicators, may be undetected.