YANGON (AFP) - Detained democracy leader Aung San Suu Kyi was admitted to hospital briefly on Sunday over concerns about her heart, a Myanmar official said. Suu Kyi was taken to Yangon General Hospital to check her heart condition for about 45 minutes, the official told AFP on condition of anonymity. He said she returned to her lakeside house, where she is held under house arrest, on Sunday night. Another official confirmed she left the hospital, but neither could give further details. Suu Kyis lawyer Nyan Win said he was as yet unaware of the visit, which is thought to be her first to hospital since 2003, although the 64-year-old has monthly medical check ups by a doctor at her home.