房颤 Traditional form: 房顫 Pinyin (reading): fángchàn Definitions: atrial fibrillation (abbr. for 心房顫動/心房颤动 (xīnfángchàndòng)) Characters: 房 - building, house, room 颤 - to shiver, to tremble; trembling Traditional characters: 房 - building, house, room 顫 - to shiver, to tremble; trembling