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过去十多年来,对进行性智能障碍原因之探索,已有不少成果.其中绝大部分属于新发现的先天性代谢异常,特别有关氨基酸的代谢.一般地说,对造成此类疾病的可能原因,可根据病理改变之特点或已知病因而加以分类.例如:先天性氨基酸或碳水化合物代谢紊乱,另一些为脂肪代谢异常.为适应临床诊断之实际需要,此类疾病常依其发病年龄而被分为:1)生后不久即起病;2)两
In the past decade or so, there have been many achievements in the exploration of the causes of progressive mental retardation, most of which belong to the newly discovered congenital metabolic abnormalities, with particular reference to the metabolism of amino acids .Generally speaking, Possible causes can be classified according to the characteristics of the pathological changes or known causes such as: congenital amino acid or carbohydrate metabolism disorders, and some fat metabolism abnormalities to meet the actual needs of clinical diagnosis, such diseases are often dependent on their incidence Age is divided into: 1) onset soon after birth; 2) two