<prompt> In which of the following condition, flat capnogram is NOT seen?ApneaComplete laryngospasmForeign body obstructing the upper airwayNone of the above  <response>: Capnography is a valuable monitor of the pulmonary, cardiovascular, and anesthetic breathing systems. Capnographs in common use rely on the absorption of infrared light by CO2. A value commonly repoed on the capnography device is the end-tidal CO2 the maximum CO2 concentration at the end of each tidal breath, or ETCO2. A flat-line capnogram can be due to either apnea, upper airway obstruction, or complete laryngospasm. Ref: Miner J.R. 2011. Chapter 41. Procedural Sedation and Analgesia. In J.E. Tintinalli, J.S. Stapczynski, D.M. Cline, O.J. Ma, R.K. Cydulka, G.D. Meckler Eds, Tintinallis Emergency Medicine: A Comprehensive Study Guide, 7e. 