Shaza Khan, Huma Batool, Zeenat Umar 2024. Comparison Effectiveness of Epidural Catheter by using Two Techniques Air Versus Saline as Pre-emptive Analgesia in Obstetric Patients. Pakistan Journal of Medical & Health Sciences. 18, 01 (Jan. 2024), 747. DOI:https://doi.org/10.53350/pjmhs02024181747.