Capnography basically monitors-: (A) Central venous pressure, (B) Blood pressure during anesthesia, (C) Concentration of exhaled CO2, (D) Concentration of inhaled O2
Answer is C. Capnography monitores end tidal CO2 levels ( CO2 in Exhaled gas ) It is based on the principle of absorption spectrophotometry . Normal levels of EtCO2 is 35-45mmg