Hajime Kataoka works as a Cardiologist and as a Physician-Scientist at Nishida Hospital, Oita, Japan. He obtained his M.D. degree from the Kagoshima University in 1977 after which he completed specialty training in cardiology. He is mainly interested in the diagnosis and evaluation of the patients with various cardiovascular diseases, especially of heart failure. Presently, he is investigating the body fluid status and cardio-renal interaction in patients with heart failure. He is a member of Japanese Circulation Society, Japanese College of Cardiology, Japanese Heart Failure Society, American Heart Association, Heart Failure Association of the ESC. He served as a member of Editorial Board of the Journals of “World Journal of Cardiology” and “Case Reports in Cardiology”.