Tanzeela Firdous, Ali Kashif, Sahira Nawaz Khan, Ayesha Waqar, Sufyan Ali, Sumayya Tariq. Compare the Mean Non Hypoxic Apnea Duration of 20° Head up with Conventional Supine Position during Pre-oxygenation in Patients Undergoing Elective Surgery. Pakistan Journal of Medical & Health Sciences [Internet]. 2022 Aug. 23 [cited 2024 Jul. 17];16(07):397. Available from: https://pjmhsonline.com/index.php/pjmhs/article/view/2071