• Acta Anaesthesiol Scand · Apr 2013

    Case Reports

    Atypical upswing at initial part of phase III in capnograms due to technical cause.

    • Department of Anesthesia and Pain Medicine, The Catholic University of Korea College of Medicine, Seoul, Korea.
    • Acta Anaesthesiol Scand. 2013 Apr 1;57(4):526-8.

    AbstractWe 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 (CO2 ) sampling tube, water trap, and unidirectional valves. The upsurge of CO2 disappeared with increasing the respiratory rate; however, it reappeared with decreasing the respiratory rate and vice versa. We experimentally reproduced the phenomenon of overshooting CO2 measurement after the luer lock connection of the sample gas line at the water trap had been unscrewed a little bit.© 2012 The Acta Anaesthesiologica Scandinavica Foundation.

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