Rise in end-tidal CO2 during thyroid surgery can be due to all except –
Anaphylaxis is generally associated with hypotension, shock, and hypoperfusion of lungs and results in decreased End Tidal CO2 measurements.
Thyroid storm (hypermetabolic state), malignant hyperthermia and neuroleptic malignant syndrome can cause rise in ETCO2.
Anaphylaxis
Malignant hyperthermia
Thyroid storm
Neuroleptic malignant syndrome