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A Comprehensive Educational Website (established 1998)

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

Bhavani Shankar Kodali MD

Updated September 2022

Esophageal intubation and carbonated beverages

Encyclopedia of capnograms

Bhavani Shankar Kodali MD

Esophageal intubation and carbonated beverages


Occasionally, an end-expired level of 2.5% (17-18 mm Hg, highest observed measurement in swine study was 38-39 mm Hg) or more may be observed in first six breaths during esophageal intubation in the presence of carbonated beverages in the stomach. However, the shape of the capnograms appear abnormal and should alert to a non tracheal intubation.


Sum Ping etal. Reliability of capnography in identifying esophageal intubation with carbonated beverage or antacid in the stomach. Anesth Analg 1991;73:333-7.