The rate of infantile cerebral palsy in the population in general is from 6 to 120 x 1,000 live births. And vary according to the developed country or developing.
In a study opened in Australia from 1975 to 1985, the reported incidence was 12. 1st 64.9 x 1,000 live births.
Another recent study analysed 3 time periods, 1975-1977, 1981-1985 and 1986-1991 at the first diagnosis was established toward the 10 years; and the last two periods from 3 to 10 years would be presenting or detecting disabilities.
- At 2500g or older:
0.8 - 1.1 x 1,000 surviving in the first year of life.
0.8 - 1.1 x 1,000 live births.
- Between 2499 g and 1500 g:
6.9 - 7.6 x 1,000 surviving in the first year of life.
6.1 – 7.6 x 1,000 born alive.
- In
65.5 - 59.5 x 1,000 surviving in the first year of life.
28.5-39.7 x 1,000 born alive.
The distribution according to topography and of type spastic is:
Percentage distribution according to weight and types of cerebral palsy spastic and not spastic.
| Type | WEIGHT | ||
| > 2500g | 2499 1500-g | <1500g: | |
| Diplegia | 10% | 20% | * 32% |
| Hemiplegia | * 29% | 18% | 19% |
| Quadriplegia | 36% | * 38% | 35% |
| Non-spastic | * 30% | 24% | 14% |
* Highest percentage of cases among 2499 and 1500g.
This has not changed much in current studies, ranging from a population to another. And it has direct relation with the standard of living and prenatal care of the populations. Although this has to be modified in direct relationship with care before pregnancy.
When analysed groups of babies that survive in the intensive weight less than 1,500 g with or without neonatal sepsis have a risk of up to 3 times more than having cerebral palsy around two years. And if increase you each risk factor this will increase by 5% for each factor.
Prenatal care of high risk pregnancies monitored with transvaginal ultrasound a week 17 to 32 of 63 fetuses studied, 42 had a greater periventricular ecodensidad, and these 28 were preterm, of which 4 were leukomalacia at birth periventrincular and 23 developed it in the first year of life
In minor of 1250 g to 500 g the rate is increased to 67 X 1,000, of which 18 x 1,000 will have delay mental slight to severe.
When not there are factors of risk in the pregnancy to the term but is found a placenta of lower weight for the age gestational and bruising retroplacentarios is associated a 62% to porencephaly and 39% with paralysis brain with an incidence of 63% of epilepsy in this population.
Those factors predictive related with which will make March are:
(That within the two first years 1) achieve roll is, sitting is or keep is of foot; ((2) that do not have quadriplegia spastic and 3) that can see.
It is is the importance of early diagnosis and that the preterm and term with risk factors are integrated to a program of early intervention.