Rise in end-tidal CO2 during thyroid surgery can be due to all except –: (A) Anaphylaxis, (B) Malignant hyperthermia, (C) Thyroid storm, (D) Neuroleptic malignant syndrome
Answer is A. 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.