Nasal packing is frequently used as a effective management in epistaxis or after intranasal surgery. The local complications produced by nasal packing are well know, but the systemic effects, particulary pulmonary changes are not well known. The alterations of the arterial blood gases(PaO₂, and PaCO₂) were studied on the 30 normal humans after intranasal surgery for the purpose of evaluating the systemic effects followed by nasal packing. Results are as follows. 1) In the changes of PaO₂, and PaCO₂ with nasal packing, PaO₂ ws decreased by 8mmHg, and PaCO₂ was increased by 3mmHg. 2) In the changes of PaO₂ and PaCO₂ after the removal of nasal packing, PaO₂ was increased by 12mmHg, and PaCO₂ was decreased by 3mmHg. 3) There was no significant differences in the changes of PaO₂ and PaCO₂ between preoperative state and postopevative state of the intranasal surgery. 4) The symptoms of patients by the changes of PaO₂ and PaCO₂ produced by nasal packing were not found in this study. If these symptoms were found, the removal of nasal packing should be primary method, and it is considered that the proper oxygen supply by the degree of the arterial blood gases will be done.