Tehran University of Medical Sciences Archives of Anesthesiology and Critical Care 2423-5849 3 3 2017 05 15 363 364 EN Alireza Ahmadi Department of Anesthesiology, Imam Reza Anesthesiology Center, Kermanshah University of Medical Sciences, Kermanshah, Iran Abbas Ahmadi Department of Anesthesiology, Imam Reza Anesthesiology Center, Kermanshah University of Medical Sciences, Kermanshah, Iran 2016 11 28 2017 04 17 Hypercapnia is a frequent event but severe hypercapnia is a harmful complication of general anesthesia. A 6 month old Iranian baby boy who had an appendicitis under general anesthesia exhibited severe hypercapnia during surgery. Arterial blood gas revealed a PCO2 of 95mmHg. Troubleshooting immediately were taken but the level of CO2 did not decline. Under that situation by elevating fresh gas flow to twice or three times the hypercapnia decreased and by adjusting FGF we could reach the best end tidal PCO2 and paco2. https://aacc.tums.ac.ir/index.php/aacc/article/view/100 https://aacc.tums.ac.ir/index.php/aacc/article/download/100/286