Neuroepidemiological surveys conducted on cerebral palsy in Okayama Prefecture in 1964 revealed that in 138, 414 children under 6 years old, 268 subjects (0.19%) had cerebral palsy.
The follow-up studies from the standpoint of developmental neurology on these 268 patients were performed four years and four months to six years and four months after the initial survey, and the following results were obtained.
(All patients are in school age at this point.)
1) Follow-up examinations were carried out on 206 (76.9%) of 268 cases, of which 41 cases (15.3%) had already died.
2) There were 13 cases (4.9%) who showed little or minimal disturbance of motor functions. These cases were considered to have improved spontaneously.
3) Fourty-two cases (15.7%) were found to be severely handicapped mentally as well as physically.
4) At the initial examination the most predominant type was the spastic one found in 103 cases (62.8%), but this type decreased to half in number by the time of the school age, while dyskinetic type (athetosis and dystonia) increased in number.
5) Spastic type turned in three different ways of manifestation, namely unchanged, dyskinetic type and spontaneous improvement.
6) Dyskinetic type showed essentially no change in clinical picture.
7) No case of hypotonic or rigid type was found in this survey. Most of the cases presented either of the type stated above, namely spastic, dyskinetic, or spontaneous improvement.
8) Clinical epilepsy was observed in 34 (12.7%) of 268 cases at the initial survey, and this complication increased to 42 (25.6%) of 164 cases at the later date.
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