Because most symptomatic patients are diagnosed at an older age, mental retardation and motor delay are difficult to reverse.
Because mental retardation and motor delay are difficult to reverse in older patients with IEM, it is essential to increase the availability of newborn screening.
Motor delay is apparent from the first year of life, with evident ataxia at the time of independent walking, if achieved.
Nine months after the initial hospitalization, the child had substantial physical and motor delays, was legally blind in both eyes, and had epilepsy.
Gross and/or fine motor delays were documented in 42%, and 23% demonstrated global developmental delay.
Each tap is performed after a motor delay, and the series of intervals produced by the timekeeper, as well as the successive motor delays are both considered as uncorrelated white noises.
No developmental or motor delays were noted.
All six patients had moderate-to-severe developmental delay, with motor delays being the most prominent and severe.
Surprisingly, unlike other mutations that reduced the channel ATP sensitivity by a similar amount, no motor or mental developmental delay was associated with the L164P mutation.
