Early-onset Alzheimer disease pathology develops in almost 100% of individuals by 40 years of age.
General Principles and Growth Monitoring
Multidisciplinary approach focuses on early stimulation, surveillance for comorbid conditions, and maximizing functional independence.
Identify patients as having special healthcare needs and enter into a chronic condition management registry to ensure coordinated longitudinal care.
Conduct regular growth monitoring at every clinical visit using Down syndrome-specific growth charts.
Monitor infants for failure to thrive secondary to dysphagia, gastrointestinal malformations, and cardiac complications.
Monitor older children and adolescents for a high tendency to develop obesity.
System-Specific Surveillance Protocol
Organ System
Evaluation/Screening Modality
Recommended Frequency
Cardiac
Echocardiography
Newborn period or before 9 months of age.
Endocrine
TSH and T4
At birth, 6 months, 12 months, and annually thereafter.
Audiology/ENT
Audiologic evaluation
Every 6 months until 3-4 years of age, then annually.
Ophthalmology
Pediatric ophthalmologic evaluation
By 1 year of age, annually until age 5, biannually until age 13, and every 3 years thereafter.
Hematology
CBC and Hemoglobin
Neonatal CBC with differential; screen for leukemia twice in first year; annual hemoglobin.
Sleep/Pulmonary
Polysomnography
Baseline study for obstructive sleep apnea by 4 years of age or earlier if symptomatic.
Dental
Pediatric dental examination
Initial visit at 1 year of age, then at least every 6 months.
Neurodevelopmental and Behavioral Management
Commence early intervention services at 2 months of age and continue into school-aged years.
Utilize physiotherapy to improve core strength, manage generalized hypotonia, and facilitate adaptive motor planning.
Provide speech therapy to manage pharyngeal hypotonia, articulation difficulties, and delayed expressive language.
Integrate occupational therapy to address fine motor delays and promote independence in activities of daily living.
Conduct routine behavioral surveillance for Autism Spectrum Disorder and Attention-Deficit/Hyperactivity Disorder.
Monitor adolescents and adults for psychiatric comorbidities, particularly depression, anxiety, and early-onset Alzheimer disease.
Musculoskeletal and Cervical Spine Surveillance
Monitor for joint instability, pes planus, and scoliosis secondary to generalized ligamentous laxity.
Current evidence advises against routine radiographic screening for asymptomatic atlantoaxial instability.
Rely on targeted neurologic examination at every visit, assessing for radicular neck pain, new-onset spasticity, weakness, clumsiness, or sudden bowel/bladder regression.
Counsel parents to restrict high-risk activities that place excessive strain on the cervical spine.
Gastrointestinal and Immunologic Monitoring
Maintain a high index of suspicion for Celiac disease; test if the child exhibits chronic diarrhea, constipation, growth faltering, unexplained anemia, or behavioral changes.
Manage gastroesophageal reflux disease and chronic constipation proactively to prevent feeding refusal and respiratory complications.
Administer routine immunizations strictly according to schedule.
Consider additional preventative strategies for common respiratory pathogens due to subtle T-cell and B-cell lymphopenia and defects in neutrophil chemotaxis.
Transition to Adulthood
Initiate a formal transition plan during adolescence, focusing on vocational training, community integration, hygiene, and self-care independence.
Provide explicit sexuality and reproductive education, discussing appropriate relationships, birth control, and increased risk of sexual victimization.
Schedule annual follow-up with a clinical geneticist to monitor adherence to complex, evolving health guidelines.
Provide recurrence risk counseling for parents; mothers aged 35 years or younger with a child affected by free trisomy 21 carry a 1% risk of recurrence in subsequent pregnancies.
