To help encourage universal quality and safety practices, the ASA has adopted and mandates the use of all the following monitors during general anesthesia, except
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An oxygen analyzer
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Capnography
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Continuous visual display of an ECG
4) A peripheral nerve stimulator
explanation
ASA standards mandate the use of pulse oximetry, capnography, an oxygen analyzer in the breathing system, disconnect alarms, a visual display of an ECG, systemic blood pressure and heart rate monitoring, and temperature monitoring (when clinically indicated) for all cases. The use of a peripheral nerve stimulator is not a mandated monitor.