Articles  |   September 2018
ACE Question
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Education / CPD / Articles
Articles   |   September 2018
ACE Question
ASA Monitor 9 2018, Vol.82, 41.
ASA Monitor 9 2018, Vol.82, 41.
Exposure to which of the following is most likely to deactivate the color indicator in soda lime absorbent?
Ethyl violet is a pH-activated color indicator that is added to the soda lime used in the carbon dioxide (CO2) absorbent canister in the anesthesia circuit. It causes the soda lime to change from white to a violet color when the pH of the absorbent decreases due to CO2 absorption. This color change indicates that the absorptive capacity of the soda lime is exhausted. Prolonged exposure to bright lights, including fluorescent lights, can deactivate the dye, making it an unreliable indicator of the absorptive capacity of the soda lime. In this event, capnography is the most sensitive indicator of exhausted soda lime. Inspired CO2 will be greater than zero if the soda lime is exhausted.
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