This article has been accepted for publication and undergone full peer review but has not been through the copyediting, typesetting, pagination and proofreading process, which may lead to differences between this version and the Version of Record. Please cite this article as doi: 10.1111/AAS.13684 This article is protected by copyright. All rights reserved PROFESSOR ABEER AHMED (Orcid ID : 0000-0002-8251-7147) PROFESSOR BASSANT MOHAMED ABDELHAMID (Orcid ID : 0000-0001-8938-4175) Article type : Clinical investigation Intraoperative MgSO 4 infusion protects oxygenation and lung mechanics in COPD patients during general anesthesia. A randomized clinical trial. Abeer Ahmed a* , Ahmed H Sayed a , Jehan Elkholy a , Sahar Elshal a , Abdelrahman Badwy b , Bassant Abdelhamid a , Mohamed Ollaek a . Affiliation: a Department of Anesthesiology, Surgical ICU and Pain Management, Kasr Alainy Faculty of Medicine, Cairo University, Egypt. b Department of Otorhinolaryngology, Kasr Alainy Faculty of Medicine, Cairo University, Egypt Short title: Intraoperative MgSO 4 infusion in COPD. Word count: 2932 Corresponding author: Assistant professor: Abeer Ahmed Accepted Article