猝死可发生于各种年龄,在成年常由于心律不齐,特别是室颤;在青少年常由于意外事故;在婴儿虽可由于心律不齐或意外事故,但常是原因不明,而称为婴儿猝死综合征(Sudden-Infant death Syndr-ome, SIDS)病理检查常无足以解释死因的变化。过去曾认为SIDS系由于肿大的胸腺引起窒息,或由于对牛奶蛋白过敏, Sudden death can occur at all ages, often due to arrhythmia in adults, especially in patients with ventricular fibrillation; in adolescents often due to accidents; although infants may be due to arrhythmia or accident, but often for unknown reasons, and called infants Sudden-Infant death Syndr-ome (SIDS) pathological examination often enough to explain changes in the cause of death. In the past, it was thought that SIDS caused suffocation due to an enlarged thymus or allergies to milk proteins,