Abbas S, Arshad Y, Ghous K, Akhtar N, Shahnawaz A, Ayub H. The Impact of PF Ratio and Oxygenation on Non-Invasive Ventilation Failure during Acute Exacerbations of COPD. AJSMU [Internet]. 5Jan.2026 [cited 9Jan.2026];11(2):62-6. Available from: http://ajsmu.com/index.php/AJSMU/article/view/375