Comparison of Long Term Oxygen-Therapy (LTOT) and LTOT Combined with Sildenafil and Simvastatin in the Treatment of Severe Chronic Obstructive Pulmonary (COPD) with Hypoxia at Rest and Severe Pulmonary Arterial Hypertension

Huong Tran-Van¹, Anh Vo-Thi-Kim², T Tran-Ngoc³ and Sy Duong-Quy^3,4,5*

¹Department of Health Science, Thang Long University, Hanoi, Vietnam

²Nam Anh General Hospital, Binh Duong Province, Vietnam

³Bio-Medical Research Center, Lam Dong Medical College, Dalat, Vietnam

⁴Department of Cardio-Pulmonology Functional Testing, Cochin Hospital, Paris Descartes University, France

⁵Penn State College of Medicine, Hershey, PA 17033, USA