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Etiologic yield of single domain developmental delay: a prospective study
M I Shevell1, A Majnemer, P Rosenbaum
1Department of Neurology/Neurosurgery, School of Physical & Occupational Therapy, McGill University, Montreal, Quebec, Canada.
Insights
Diagnosing the cause of developmental delay in young children varies significantly. While causes are rarely found for developmental language disorder, over half of isolated motor delay cases have identifiable, often preventable, etiologies.
Area of Science:
- Pediatric Neurology
- Developmental Pediatrics
- Clinical Genetics
Background:
- Single domain developmental delay affects young children, encompassing developmental language disorder and isolated motor delay.
- Specialty diagnostic evaluations are crucial for identifying underlying etiologies.
- Understanding the etiologic yield is vital for guiding medical management and parental counseling.
Purpose of the Study:
- To determine the diagnostic yield of specialty evaluations for young children with single domain developmental delay.
- To compare the etiologic yield between developmental language disorder and isolated motor delay.
- To identify factors predicting successful etiologic diagnosis in pediatric developmental delay.
Main Methods:
- Prospective enrollment of children under 5 years with single domain developmental delay referred to pediatric neurology or developmental pediatrics.
- Etiologic yield assessed through clinical assessments and physician-ordered laboratory studies.
- Analysis of diagnostic outcomes for developmental language disorder versus isolated motor delay groups.
Main Results:
- Developmental language disorder had a low etiologic yield (4.1%), with non-audiometric investigations being uninformative.
- Isolated motor delay showed a higher etiologic yield (59%), with over half of identified causes being potentially preventable.
- Physical findings on initial assessment strongly predicted successful etiologic determination in isolated motor delay (P =.002).
Conclusions:
- The etiologic yield for single domain developmental delay significantly differs between developmental language disorder and isolated motor delay.
- Diagnostic evaluation is more fruitful for children with isolated motor delay, often impacting management and recurrence risk.
- Further research into specific etiologies for developmental language disorder may be warranted.
Objective:
To determine the etiologic yield in young children with single domain developmental delay (either developmental language disorder or isolated motor delay) after a specialty diagnostic evaluation.
Methods:
During an 18-month period, all children <5 years of age, who were consecutively referred to pediatric neurology or developmental pediatric clinics at a single tertiary pediatric center, were prospectively enrolled. Etiologic yield was determined after completion of clinical assessments and selected laboratory studies requested by the evaluating physician.
Results:
Seventy-two children (60 boys) were found to have a developmental language disorder, and 22 children (11 boys) had isolated motor delay, of whom 6 had an associated diagnosis of cerebral palsy. An etiologic diagnosis was rarely made in the children with developmental language disorder (3/72, 4.1%). Laboratory investigations (metabolic, cytogenetic, imaging), aside from audiometry, were uniformly uninformative. In those children with isolated motor delay, an etiology was apparent in more than half (13/22, 59%). Slightly more than half (7/13, 54%) of etiologies identified in this group were potentially preventable. Successful etiologic determination in children with motor delay often had an impact on recurrence risk estimation, medical management, or specific therapy offered (8/13, 62%). The presence of physical findings on initial assessment was found to be highly predictive of successful etiologic determination in children with isolated motor delay (13/17 vs 0/5, P =.002).
Conclusion:
Etiologic yield differs substantially according to the subgroup of single domain developmental delay.