FIVE Hongkong doctors are to be trained in the latest heart treatment techniques - including transplants and balloon angioplasty - at some of the United States' most prestigious medical centres. Dr Patrick Pau Wing-Iu, executive member of the Hongkong Heart Foundation, which is sponsoring the doctors at a total cost of $625,000, said the move was an attempt to improve treatment of heart disease, the territory's second biggest killer. Dr Pau said the foundation was trying to support efforts by the Hongkong Academy of Medicine to set up advanced training programmes in different medical specialties in Hongkong. ''We feel it is not enough to have training in Hongkong,'' Dr Pau said. ''We need to send doctors abroad too because the pace of technology is so fast.'' The doctors - Wilson Chan Wai-man of the Prince of Wales, Charles Chow Wai-ho and Duncan Ho Hung-kwong of Queen Elizabeth, Kathy Lee Lai-fun of Queen Mary and William Ng Wai-lin of Grantham - have completed two years' training in cardiology here. They will spend their final year of training at centres such at Stanford University, Minnesota's Mayo Clinic, and the University of Michigan. Queen Elizabeth Hospital's Dr Ho said he was very excited: ''These centres are very famous.'' Dr Ho said he was looking forward to learning advanced techniques unavailable in Hongkong, such as atherectomy. This enables doctors to tunnel through blocked arteries - a treatment which could benefit patients such as Governor Chris Patten who underwent balloon angioplasty in January. Other new techniques include electrophysiology, which detects abnormal electrical pathways in the hearts of patients with an irregular heartbeat, enabling them to be corrected. Foundation chairman Sir Quo-wei Lee appealed for more donations from the public to fund the programme in future.