A critical article, made in the DSM-III, about the choices
concerning autism and the autism related disorders (written
by employees of Yale Child Study Center in 1986) and
supported by later studies (Siegel 1986, Dahl, Cohen
en Provence 1986, Szatmari 1992), has caused, based
on solid pre-investigation (1994), that a number of
subcategories are included in the DSM-IV (Asperger's
syndrome, Rett's syndrome and the desintegrative disorders).
(more in the link above)
They assumed that within the restgroup PDD-NOS, a few
subcategories of persons, showing characteristics related
to autism (disorder in the reciprocal social relations)
but differing from autistic people on other details,
would be identified.
Cohen and employees (1986) asked for attention about
a proposal that got no hearing.
It was about a group of children that regularly were
seen in clinical practice, but in literature named very
differently so far viz.:
On ground of literature investigation they came up with
the idea that all those children match the criteria
summarised in three main categories:
- atypical development
- symbiotic psychosis
- borderline disorders in childhood
- schizoid personality disorders
- schizotypical disorders
||disorders in the sensitivity for social signals
and in the development of reciprocal social relations.
||disorders in the regulation of affects.
||disorders in thinking.
The syndrome manifests itself on the age of 2-3.
There are no indications for an autistic or schizophrenic
First this concept got the name Multiplex Developmental
Disorder, but changed its name in 1993 to Multiple-complex
Developmental Disorder, because the initial abbreviation
MDD caused too much confusion with the more naturalised
abbreviation for 'Major Depressive Disorder'. The new
abbreviation matches no predecessor.
The name itself doesn't say anything more about this
group than that the development is disturbed on more
McDD is a developmental disorder considered to be a
sub-type of PDD-NOS, the restgroup of pervasive developmental
disorders, and is therefore a related disorder of autism.
(more information about McDD, you can find in the link
Mostly it will be diagnosed as such, because it isn't
mentioned in the DSM-IV-TR yet.
It would be better though that autism related disorders
aren't seen as a milder form of autism. Several symptomatological
factor analyses have revealed that the autism spectrum
can be divided in four groups:
Because of the lack of clear diagnostic criteria, the
investigation on this last mentioned group is hampered,
which is regretable, especially because autism related
disorders are more common than autism itself.
- the classical Kanner-type autistic
- a group of Kanner-type autistic
patients with mental retardation
- a group of atypical patients with
more organic disturbances
- a group of patients with more affective
and schizoid symptoms can be distinguished (Dahl
et al, 1986; Siegel et al, 1986; Szatmari et al,
1989) and these matches the group of multiple-complex
developmental disorders (Cohen et al, 1986).
|© 2006 #McDD - realisation: