Severe Pulmonary Hypertension in Chronic Kidney Disease Patient with Ovarian Tumour: Use of Graded Epidural Anaesthesia for Laparatomy: A Case Report. J Med B Sci Res [Internet]. 2023 Jan. 12 [cited 2024 Dec. 24];4(1-2):113-5. Available from: https://jmbsr.com.ng/index.php/jmbsr/article/view/172