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脊肌萎缩症（ｓｐｉｎａｌｍｕｓｃｕｌａｒａｔｒｏ－ｐｈｙ，ＳＭＡ）是较常见的常染色体隐性遗传病。在白种人中发生率为１／６０００［１］，我国尚无统计，但不少见。根据病情轻重及病程，本病可分３型［２］：Ⅰ型又称重型，急性型、婴儿型，或Ｗｅｒｄｎｉｇ－Ｈｏｆｆ
Spinal muscular atrophy (SMA) is a more common autosomal recessive disease. Occurred in Caucasians in 1/6000 [1], there is no statistics in our country, but not uncommon. According to the severity and duration of disease, the disease can be divided into 3 types: type I also weighing, acute, infants, or Werdnig-Hoff