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Atypical upswing at initial part of phase III in capnograms due to technical cause
Author(s) -
CHON J.Y.,
KANG J.M.
Publication year - 2013
Publication title -
acta anaesthesiologica scandinavica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.738
H-Index - 107
eISSN - 1399-6576
pISSN - 0001-5172
DOI - 10.1111/aas.12026
Subject(s) - medicine , ventilation (architecture) , anesthesia , intubation , respiratory system , endotracheal intubation , respiratory monitoring , trap (plumbing) , respiratory rate , tracheal intubation , endotracheal tube , surgery , anatomy , meteorology , heart rate , blood pressure , physics
We sporadically experienced three paediatric cases of atypical upswing at the initial part of phase III in the capnograms via side‐stream capnometer immediately following endotracheal intubation and mechanical ventilation. No fault was found in the monitor or anaesthetic system including breathing circuits, carbon dioxide ( CO 2 ) sampling tube, water trap, and unidirectional valves. The upsurge of CO 2 disappeared with increasing the respiratory rate; however, it reappeared with decreasing the respiratory rate and vice versa. We experimentally reproduced the phenomenon of overshooting CO 2 measurement after the luer lock connection of the sample gas line at the water trap had been unscrewed a little bit.