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A Comprehensive Educational Website (established 1998)

Designed, Produced, and maintained (Edition 12, January 2022) by 

Bhavani Shankar Kodali MD

Updated January 2022

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A Flat Line

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This may happen under the following circumstances:

Monitor has been just turned on and it is warming up.

Monitor periodically zeroes itself. Most units display 'zeroing' during this process.

Esophageal intubation

Accidental extubation

Apnea

Circuit disconnection

Cardiac arrest

Sampling tube disconnection.

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