Pediatrics (System-Integrated)

Down syndrome: surveillance and primary care

Clinical Overview and When to Suspect Down Syndrome

— Nondisjunction (~95%): maternal meiotic error; risk rises sharply with maternal age (1/1500 at age 20, 1/100 at age 40).

— Robertsonian translocation (~3–4%): typically der(14;21); recurrence risk is substantial if a parent is a balanced carrier (10–15% if maternal carrier, ~1% if paternal).

— Mosaicism (~1–2%): variable phenotype; do not assume milder cognitive outcomes.

— Hypotonia, flat facies, upslanting palpebral fissures, epicanthal folds, small ears, single transverse palmar crease, sandal-toe gap, brachycephaly, brushfield spots, redundant nuchal skin, poor Moro reflex.

— Feeding difficulty, delayed meconium passage (consider Hirschsprung), bilious emesis (duodenal atresia/annular pancreas).

— First-trimester combined screen (NT + PAPP-A + β-hCG), quad screen (↓AFP, ↓estriol, ↑hCG, ↑inhibin A), and cell-free fetal DNA (cfDNA) — highest sensitivity/specificity noninvasive option.

— Confirmation requires karyotype via CVS (10–13 wk) or amniocentesis (≥15 wk).

Down syndrome (trisomy 21) is the most common autosomal aneuploidy and the leading genetic cause of intellectual disability in the US, with a live-birth prevalence of ~1 in 700.

Three cytogenetic mechanisms:

When to suspect in the newborn nursery:

Prenatal detection drives many diagnoses before birth:

Board pearl: cfDNA is a screening test even with >99% sensitivity for T21 — positive results still require diagnostic karyotype before counseling about termination or planning delivery at a tertiary center.

Primary care role begins immediately at diagnosis: confirm karyotype (even if phenotype is classic), disclose with both parents present in a private setting using person-first language, and initiate the AAP Down syndrome health supervision schedule that anchors care from birth through adulthood.

Presentation Patterns and Key History

— Hypotonia ("floppy infant"), poor suck, prolonged jaundice, polycythemia, transient abnormal myelopoiesis (TAM) in ~10%.

— Congenital heart disease in ~50% (most commonly AV septal defect/AVSD, then VSD, ASD, tetralogy of Fallot).

— GI anomalies: duodenal atresia ("double bubble"), annular pancreas, imperforate anus, Hirschsprung disease, TEF.

— Global developmental delay; gross motor most delayed (walking ~24 mo).

— Recurrent otitis media → conductive hearing loss; OSA emerges by age 3–4.

— Failure to thrive vs. later obesity risk; constipation common.

— Mild–moderate intellectual disability (mean IQ 40–70).

— Atlantoaxial instability concerns with sports participation.

— Behavioral: ADHD, anxiety, oppositional behavior; autism spectrum disorder co-occurs in ~15–20%.

— Delayed puberty in males, near-normal in females; men are typically infertile, women are subfertile with 50% chance of transmitting T21.

— Obesity, OSA, depression, celiac disease, thyroid dysfunction.

— Early-onset Alzheimer disease (clinical dementia typically begins in 40s–50s due to triplicated APP gene on chr 21).

— Increased risk of leukemia (ALL and AMKL), reduced risk of most solid tumors.

Newborn period:

Infancy/toddler:

School age:

Adolescence/young adult:

Adulthood:

Key distinction: A new behavioral regression in an adolescent or adult with Down syndrome is not automatically early Alzheimer — always rule out hypothyroidism, OSA, depression, hearing/vision loss, celiac disease, atlantoaxial myelopathy, and B12 deficiency first. These are reversible and far more common than dementia before age 40.

Family history should screen for translocation carriers if the child has translocation T21; offer genetic counseling and parental karyotyping in that subset only.

Physical Exam Findings and Hemodynamic Assessment

— Listen for holosystolic murmur (VSD, AVSD regurg), fixed split S2 (ASD), single S2 (pulmonary HTN), gallop.

— AVSD may be deceptively quiet in the neonate because pulmonary vascular resistance is still high; the absence of a murmur does not rule out CHD.

— Assess perfusion, hepatomegaly, tachypnea, growth velocity — signs of CHF from left-to-right shunt typically appear at 4–8 weeks as PVR drops.

Craniofacial: brachycephaly, flat occiput, midface hypoplasia, small/low-set ears, upslanting palpebral fissures, epicanthal folds, Brushfield spots (speckled iris), protruding tongue (relative macroglossia from small oral cavity), narrow palate, dental anomalies.

Musculoskeletal: generalized hypotonia, joint hyperflexibility, short broad hands, single transverse palmar (simian) crease, clinodactyly of 5th finger, wide gap between 1st–2nd toes (sandal gap), short stature.

Neuro: decreased Moro, poor head control, brisk early reflexes uncommon; later assess gait, neck pain, torticollis, hyperreflexia, clonus, or bowel/bladder change → screen for symptomatic atlantoaxial instability.

Cardiac exam at every visit through infancy:

Skin/HEENT: cutis marmorata, dry skin, alopecia areata, cataracts (congenital and acquired), strabismus, nystagmus, refractive error, conductive hearing loss from chronic effusions.

GU: cryptorchidism, hypospadias, small phallus.

Step 3 management: Every infant with Down syndrome needs an echocardiogram by a pediatric cardiologist before 1 month of age — even if newborn exam and pulse oximetry are normal. Pulse-ox CCHD screening misses left-to-right shunts and AVSDs without cyanosis. Document the echo in the chart as part of the discharge bundle from the newborn nursery.

Diagnostic Workup — Initial Labs, Imaging, and Newborn Bundle

— Send karyotype (cytogenetic analysis) on every newborn with suspected T21 — distinguishes nondisjunction, translocation, and mosaicism; this distinction drives recurrence-risk counseling.

— FISH or chromosomal microarray can give rapid preliminary results but karyotype remains the standard.

— Echocardiogram by pediatric cardiology within first month.

— CBC with differential at birth: screen for polycythemia (Hct >65% → partial exchange if symptomatic), leukocytosis, blasts (transient abnormal myelopoiesis).

— TSH as part of state newborn screen, then repeat at 6 and 12 months and annually thereafter (high rate of congenital and acquired hypothyroidism).

— Newborn hearing screen (ABR preferred over OAE) — high false-negative rate with OAE due to narrow canals.

— Red reflex and ophthalmology referral by 6 months for congenital cataract and strabismus.

— Feeding/swallow evaluation if any feeding difficulty or aspiration risk.

— Abdominal x-ray if bilious emesis or no meconium in 48 hours → "double bubble" → surgical consult.

— Contrast enema/rectal suction biopsy if delayed stool, distention → Hirschsprung.

— Do NOT order routine cervical spine films in asymptomatic infants. AAP no longer recommends routine screening films; image only if neurologic symptoms or before high-risk activities (e.g., Special Olympics in some programs).

Confirmatory genetic testing:

Newborn nursery bundle (AAP):

Imaging only when indicated:

CCS pearl: On the order screen for a new T21 newborn, the bundle to enter is karyotype, echocardiogram, CBC with diff, TSH, hearing screen (ABR), red reflex/ophtho referral, feeding evaluation, genetics counseling, early intervention referral. Advancing the clock without echo and TSH will be flagged.

Diagnostic Workup — Ongoing Surveillance Studies by Age

— CBC at birth (TAM), then again to monitor; lifetime risk of ALL ~1% and AMKL ~500× general population, especially under age 5.

— Any unexplained bruising, pallor, fatigue, or hepatosplenomegaly → CBC and peripheral smear urgently.

— TSH at birth, 6 mo, 12 mo, then annually for life. Free T4 if TSH abnormal. Anti-TPO if acquired autoimmune hypothyroidism suspected.

— Newborn ABR; behavioral audiometry every 6 months until age 4, then annually. Tympanograms often abnormal due to chronic effusion → ENT referral, possible tubes.

— Ophtho exam by 6 months, then every 1–2 years; watch for keratoconus in adolescence.

— Polysomnogram by age 4 for all children regardless of symptoms (OSA prevalence 50–80%, parent report unreliable).

— Screen with tissue transglutaminase IgA + total IgA when symptomatic (failure to thrive, diarrhea, constipation, anemia, behavior change). Routine universal screening of asymptomatic children is debated; AAP suggests symptom-driven testing.

— Targeted history and neuro exam at every well visit; imaging only if symptoms (neck pain, torticollis, gait change, weakness, bowel/bladder dysfunction, hyperreflexia).

— Annual TSH, CBC, lipid panel; weight/BMI; depression and dementia screening using baseline cognitive assessment in early adulthood as a comparator.

Hematology:

Thyroid:

Hearing:

Vision:

Sleep:

Celiac disease:

Cervical spine:

Adult-specific:

Board pearl: A child with Down syndrome and new-onset behavior change or developmental regression → check TSH, CBC, hearing/vision, sleep study, celiac serologies, and cervical spine exam before invoking neurodevelopmental causes.

Risk Stratification and Management Logic

— Anchor on the AAP Health Supervision for Children and Adolescents with Down Syndrome guideline (2022 update).

— At each well visit: review growth on Down syndrome–specific growth charts (CDC 2015), update surveillance labs, screen for behavioral and developmental concerns, address family supports.

— 0–1 mo: confirm diagnosis, echo, CBC, TSH, hearing, red reflex, feeding, genetics.

— 1–12 mo: echo follow-up, repeat TSH (6, 12 mo), ophtho by 6 mo, audiology by 6 mo, early intervention enrollment.

— 1–5 yr: annual TSH/CBC, audiology every 6 mo, ophtho yearly, PSG by age 4, dental every 6 mo from age 2, celiac if symptomatic.

— 5–13 yr: annual TSH, CBC, audiology, ophtho every 1–2 yr, behavior/mental health screen, school IEP support, transition to MyPlate/active lifestyle counseling.

— 13–21 yr: annual TSH, lipid panel at 20, mental health, OSA reassessment, reproductive health and consent capacity discussion, transition planning to adult care by age 14.

— Adult: annual TSH, CBC, lipid, depression, dementia surveillance, OSA reassessment, vision/hearing yearly.

— AVSD repair patients → endocarditis prophylaxis only for first 6 months post-repair or if residual defect.

— Children with severe OSA → cardiac re-evaluation for pulmonary HTN.

Down syndrome management is not a single disease pathway but a lifelong, multisystem surveillance schedule layered onto routine pediatric care. The framework:

Risk-stratify by age band:

Identify high-risk subgroups within Down syndrome:

Step 3 management: The single most cost-effective intervention in this population is adherence to the surveillance schedule — most morbidity comes from missed hypothyroidism, untreated OSA, undetected hearing loss, and delayed CHD repair, not from rare cancers. Frame the well visit as a checklist-driven encounter and document each surveillance domain.

Pharmacotherapy and Targeted Medical Therapy

— Treat congenital hypothyroidism with levothyroxine 10–15 mcg/kg/day; titrate to TSH and free T4 with repeat labs in 2–4 weeks.

— In acquired hypothyroidism, start lower (~25–50 mcg/day in older children) and titrate.

— Diuretics (furosemide ± spironolactone), high-calorie formula for growth, sometimes ACE inhibitor; refer for surgical repair of AVSD ideally by 3–6 months of age to prevent irreversible pulmonary vascular disease.

— First line is adenotonsillectomy; CPAP if residual; weight management; consider hypoglossal nerve stimulator in select adolescents.

— Stimulants (methylphenidate) effective but start low, go slow; rule out OSA and hypothyroidism first since they mimic ADHD.

— Polyethylene glycol after ruling out Hirschsprung; ensure adequate fiber and hydration.

— Cholinesterase inhibitors (donepezil) and memantine have limited but reasonable trial evidence; treat depression, OSA, hypothyroidism first.

There is no disease-modifying pharmacotherapy for Down syndrome itself; drugs target comorbidities. Build a problem-list–based regimen rather than a syndrome-based one.

Hypothyroidism (~15% lifetime, can present at any age):

CHF from left-to-right shunt before surgical repair:

OSA:

ADHD:

Constipation:

Celiac disease: strict gluten-free diet after biopsy confirmation.

Alzheimer-related dementia in adults with DS:

Vaccinations: standard schedule plus annual influenza, RSV per age criteria, and pneumococcal coverage; many adults with DS qualify for PPSV23 due to functional immune deficits and CHD.

Board pearl: Before attributing new fatigue, weight gain, or cognitive slowing in a teen with DS to "the syndrome," always check a TSH — autoimmune hypothyroidism prevalence climbs steadily with age and is the most common reversible cause of decline.

Procedures and Surgical Management

— Complete AVSD repair by 3–6 months of age to prevent fixed pulmonary vascular disease (Eisenmenger physiology develops faster in DS than in non-DS children).

— VSD/ASD/PDA closure timed by hemodynamic significance.

— Pre-op: dental clearance, immunization update, RSV prophylaxis in season, optimize nutrition.

— Post-op endocarditis prophylaxis for 6 months or while residual defect/prosthetic material exists.

— Duodenal atresia repair (duodenoduodenostomy), Hirschsprung pull-through, imperforate anus repair, TEF repair — coordinate with cardiac status before anesthesia.

— Myringotomy with tubes for recurrent effusions/conductive loss.

— Adenotonsillectomy for OSA — counsel families that residual OSA after T&A is common in DS (up to 50%) and a post-op PSG in 6–12 weeks is standard.

— Symptomatic atlantoaxial instability → cervical MRI/flexion-extension films → neurosurgical decompression/fusion.

— Hip dysplasia, slipped capital femoral epiphysis, patellar instability — orthopedic referral.

— Atlantoaxial instability → avoid neck hyperextension during intubation; consider awake fiberoptic or video laryngoscopy.

— Smaller subglottic diameter → use smaller ETT than predicted by age.

— Bradycardia with inhalational induction is common — be ready with atropine.

— Screen for pulmonary HTN pre-op in any child with unrepaired CHD or severe OSA.

Cardiac surgery (the highest-impact procedure in DS):

GI surgery in neonates:

ENT procedures:

Ophthalmologic: cataract surgery, strabismus repair, keratoconus management (cross-linking, contacts).

Orthopedic:

Anesthesia considerations (critical):

CCS pearl: Before any elective surgery in a child with DS, the order set should include recent echo, CBC, TSH, cervical spine neuro exam, anesthesia consult, and dental clearance. Skipping the cervical exam is the classic exam trap.

Special Populations — Adults with Down Syndrome

— Mitral and aortic valve disease (mitral valve prolapse, aortic regurgitation) develops in adulthood even without congenital heart disease — get a baseline adult echocardiogram at transition (~18–21 yr).

— Pulmonary HTN from chronic OSA or unrepaired shunts.

— Obesity, type 2 diabetes, hyperlipidemia — screen lipids at age 20 and every 5 years, A1c per ADA risk-based criteria, lower threshold given sedentary risk.

— Osteopenia/osteoporosis earlier than general population — DEXA at age 30 in select patients.

— Decreased solid tumor risk overall; increased testicular germ cell tumor risk in men — perform annual testicular exam.

— Continue annual CBC; new cytopenias warrant prompt hematology referral.

— Alzheimer disease: clinical dementia in ~50–70% by age 60. Establish a baseline adult cognitive/adaptive assessment around age 30 as a comparator. Annual screening from age 40 using DS-specific tools (NTG-EDSD, DSQIID).

— Late-onset seizures may be the first sign of Alzheimer disease in DS.

Life expectancy has risen from ~25 years (1980s) to ~60 years today due to CHD repair and improved primary care — adults now constitute the fastest-growing DS demographic, and primary care must own their longitudinal care.

Cardiac:

Endocrine/metabolic:

Hematologic/oncologic:

Renal/hepatic: generally normal; standard dosing applies, but adjust for body size and comorbidities.

Neurologic:

Reproductive: counsel about fertility (men typically infertile, women subfertile with 50% transmission risk), contraception, consent capacity, healthy relationships, and abuse screening.

Step 3 management: When an adult with DS presents with new cognitive decline, the workup is TSH, B12, CBC, CMP, depression screen, OSA reassessment, hearing/vision, medication review, and structural brain imaging if focal findings — before labeling as Alzheimer dementia.

Special Populations — Pregnancy, Adolescents, and Transition

— Offer all pregnant patients (not just advanced maternal age) both screening and diagnostic options per ACOG.

— cfDNA preferred screen ≥10 weeks; positive screen → confirmatory CVS or amniocentesis.

— Provide balanced, non-directive counseling including continuation, adoption, and termination; connect with parent peer groups and the Down syndrome diagnosis network.

— Plan delivery at a center with NICU and pediatric cardiology if prenatally diagnosed.

— High-risk OB management; ~50% transmission of T21; increased risk of preeclampsia, preterm birth; cardiac and thyroid status optimization preconception.

— Normal pubertal development in females; sexual health and consent education in developmentally appropriate language.

— Menstrual hygiene support; contraception decisions involve patient, family, and capacity assessment.

— Sexual abuse risk is 4–10× higher in individuals with intellectual disability — screen routinely and sensitively.

— Begin transition planning at age 14; complete by 21.

— Establish medical guardianship or supported decision-making before age 18 if indicated; address Social Security disability (SSI), Medicaid waivers, vocational training, special needs trusts.

— Identify an adult primary care clinician comfortable with DS surveillance; send a written transition summary including baseline cognition, comorbidities, and surveillance schedule.

Prenatal diagnosis and counseling:

Women with Down syndrome who become pregnant:

Adolescent reproductive health:

Transition from pediatric to adult care:

Key distinction: Guardianship is not automatic at age 18, even with intellectual disability — it requires a court process. Failure to plan results in the young adult legally controlling their own decisions on their 18th birthday, which can disrupt care. Discuss alternatives like power of attorney and supported decision-making, which preserve more autonomy.

Complications and Adverse Outcomes

— Unrepaired or late-repaired shunts → Eisenmenger syndrome (irreversible pulmonary vascular disease, cyanosis, polycythemia).

— Acquired valvular disease in adulthood.

— Endocarditis risk with residual prosthetic material.

— Recurrent pneumonia, aspiration from hypotonia and GERD.

— Chronic OSA → pulmonary HTN, cor pulmonale, cognitive decline, behavioral problems, growth failure.

— Hypothyroidism (congenital and acquired autoimmune).

— Type 1 diabetes increased ~4×; type 2 diabetes from obesity.

— Transient abnormal myelopoiesis (TAM) in neonates: typically resolves but 20–30% develop AMKL by age 4.

— ALL and AMKL lifetime increased.

— Iron deficiency anemia from picky eating and celiac disease.

— Celiac disease (5–15%), GERD, constipation, Hirschsprung-associated enterocolitis post-repair.

— Symptomatic atlantoaxial instability (rare but catastrophic if missed).

— Seizures (infantile spasms in infancy, late-onset seizures in adults often signaling Alzheimer disease).

— Early-onset Alzheimer disease.

Cardiac:

Respiratory:

Endocrine:

Hematologic/oncologic:

GI:

Neurologic:

Sensory: progressive hearing loss, cataracts, keratoconus, severe refractive errors.

Mental health: depression, anxiety, autism (15–20%), ADHD, OCD.

Musculoskeletal: hip subluxation, SCFE, patellar dislocation, scoliosis.

Skin: alopecia areata, vitiligo, hidradenitis suppurativa, atopic dermatitis.

Board pearl: Infantile spasms (West syndrome) are notably more common in Down syndrome and respond particularly well to ACTH or vigabatrin, often with better neurodevelopmental outcomes than in idiopathic cases — recognize subtle "jackknife" flexor spasms with hypsarrhythmia on EEG and refer urgently.

When to Escalate Care — Consults and Inpatient Triage

— Any newborn with DS (within first month).

— Murmur, cyanosis, poor feeding, tachypnea, failure to thrive, diaphoresis with feeds.

— Bilious emesis, abdominal distention, failure to pass meconium, imperforate anus — neonatal surgery.

— Symptomatic atlantoaxial instability → neurosurgery and immobilization.

— Neonatal blasts on smear, unexplained cytopenias, organomegaly, persistent leukocytosis — evaluate for TAM/AMKL/ALL.

— Polycythemia with Hct >65% in symptomatic neonate → partial exchange transfusion.

— PSG positive for moderate–severe OSA → ENT for adenotonsillectomy and pulmonology if pulmonary HTN suspected.

— Persistent TSH abnormality, growth deceleration, diabetes management complexity.

— All translocation cases for parental karyotype and recurrence-risk counseling.

— Mosaic cases for prognostic counseling.

— Behavioral regression, suspected ASD, depression, suicidality.

— Pneumonia with hypoxemia (lower threshold given CHD/OSA risk).

— Dehydration with electrolyte derangement.

— Pre-op admission for cardiac surgery or major procedures.

— Acute neurologic change (seizure, focal deficit, suspected cord compression).

Immediate cardiology consult and echo:

Urgent surgical consult:

Hematology consult:

ENT/pulmonology:

Endocrinology:

Genetics:

Mental health/developmental:

Inpatient admission triggers:

CCS pearl: In a CCS case of a febrile, lethargic infant with Down syndrome, your first orders are CBC with diff, blood culture, urinalysis/culture, CXR, IV access, and empiric ceftriaxone after cultures — these children behave like immunocompromised hosts with frequent occult bacteremia and have higher mortality from sepsis. Don't wait for classic SIRS criteria before escalating.

Key Differentials — Other Trisomies and Aneuploidies

— Clenched fists with overlapping fingers, rocker-bottom feet, microcephaly, micrognathia, prominent occiput, severe IUGR.

— VSD, ASD, PDA, omphalocele; >90% mortality in first year; surveillance approach is comfort-focused.

— Holoprosencephaly, cleft lip/palate, polydactyly, microphthalmia, scalp cutis aplasia, severe CHD.

— Similarly high early mortality.

— Female with short stature, webbed neck, low hairline, coarctation of aorta and bicuspid aortic valve, primary amenorrhea, streak ovaries, lymphedema. Normal intelligence (unlike DS).

— Tall stature, gynecomastia, small testes, infertility, mild learning disability. Phenotype emerges in adolescence, not infancy.

— Same trisomy 21 cytogenetic event but only a fraction of cells affected; phenotype variable but don't over-promise mild course — IQ and comorbidity distributions overlap significantly with full trisomy.

— Phenotypically identical to nondisjunction DS but recurrence risk is elevated; parental karyotyping is mandatory.

Distinguishing Down syndrome from other chromosomal syndromes is high-yield because management and prognosis differ dramatically.

Trisomy 18 (Edwards syndrome):

Trisomy 13 (Patau syndrome):

Turner syndrome (45,X):

Klinefelter (47,XXY):

Mosaic DS:

Translocation DS:

Key distinction: All three autosomal trisomies (13, 18, 21) share CHD, growth restriction, and developmental delay, but only Down syndrome has a survival trajectory measured in decades with appropriate care. The presence of severe midline defects (holoprosencephaly, omphalocele, rocker-bottom feet) should push the differential toward T13/T18 rather than T21 — and karyotype is the arbiter.

Key Differentials — Non-Chromosomal Conditions That Mimic Features

— Prader-Willi syndrome: neonatal hypotonia, poor feeding, then hyperphagia/obesity, hypogonadism, characteristic facies; chr 15q11-q13 imprinting.

— Spinal muscular atrophy (SMA): profound weakness with tongue fasciculations, areflexia, frog-leg posture; SMN1 deletion. Cognition preserved.

— Congenital myotonic dystrophy: mother with myotonia, polyhydramnios, clubfeet, facial diplegia.

— Zellweger spectrum: dysmorphic, seizures, hepatomegaly, very long chain fatty acids elevated.

— Macroglossia, umbilical hernia, hypotonia, prolonged jaundice, constipation — can phenocopy DS in newborn. Newborn screen catches it; DS infants must still have separate karyotype.

— Short palpebral fissures, smooth philtrum, thin upper lip, microcephaly, developmental delay; history of prenatal alcohol exposure.

— Consider chromosomal microarray, fragile X testing, Rett (in females), Angelman, Williams (elfin facies, supravalvular AS, hypercalcemia, "cocktail party" personality).

Hypotonic infant differential (DS shares this with many disorders):

Congenital hypothyroidism:

Fetal alcohol spectrum disorder:

Beckwith-Wiedemann: macroglossia and abdominal wall defect but with macrosomia, hemihypertrophy, Wilms tumor risk.

Robin sequence: micrognathia, glossoptosis, cleft palate — distinct from DS macroglossia/midface hypoplasia.

Idiopathic intellectual disability with normal karyotype:

Board pearl: Macroglossia + hypotonia + umbilical hernia + prolonged jaundice = think either Down syndrome or congenital hypothyroidism — and the cheap, fast move is to check the newborn screen TSH and send a karyotype simultaneously; they are not mutually exclusive and ~1% of DS infants also have congenital hypothyroidism.

Long-Term Plan and Preventive Health

— Routine pediatric schedule on time.

— Annual influenza from 6 months.

— RSV prophylaxis (nirsevimab) per current AAP/CDC criteria — DS with hemodynamically significant CHD qualifies as high-risk.

— Pneumococcal: PCV per schedule; consider PPSV23 at age 2 and again at 5 in children with chronic cardiac/pulmonary disease.

— COVID-19 per current recommendations — adults with DS have substantially elevated COVID-19 mortality and are a priority population.

— HPV at 9–12 yr, MenACWY and MenB per schedule.

— DS-specific growth charts; counsel against excess calorie intake from early childhood.

— Daily physical activity 60 min; structured sports with cervical screening if collision risk.

— Dental visits every 6 months from age 2 (high rate of periodontal disease).

— Annual depression and anxiety screening from adolescence.

— Connect families to National Down Syndrome Society, local parent groups, and early intervention/IEP services.

— Special needs trust, ABLE accounts, SSI eligibility, Medicaid waivers, guardianship vs. supported decision-making by age 18.

— Reconcile thyroid, cardiac, psychiatric meds; ensure no anticholinergic burden that could worsen cognition.

Down syndrome is a lifetime primary care relationship, not a pediatric handoff. Build a problem list and surveillance calendar that travels with the patient.

Vaccinations:

Lifestyle and nutrition:

Mental health and social:

Financial/legal planning:

Adult discharge medications after any admission:

Step 3 management: At the well-adult visit for a 35-year-old with DS, your order set is TSH, CBC, lipid panel, depression screen (PHQ-9 modified), baseline cognitive/adaptive assessment, vision and hearing, OSA reassessment, dental, age-appropriate cancer screening (including testicular exam in men), and review of guardianship and advance directives.

Follow-Up, Monitoring, and Family Counseling

— Newborn: 1–2 weeks, then standard well-child schedule (1, 2, 4, 6, 9, 12 mo), often with extra visits for feeding/weight checks.

— Toddler/childhood: every well visit plus subspecialty cadence (cardiology, audiology q6mo, ophtho yearly, dental q6mo).

— Adolescent: annual primary care + mental health + transition planning.

— Adult: annual primary care visit at minimum.

— Growth on DS-specific curves.

— TSH (annual), CBC (annual), lipid panel (every 5 yr in adults).

— Audiology and ophtho dates.

— PSG dates and results.

— Echo dates.

— Cognitive baseline (around age 30) and annual screening from age 40.

— Early intervention (Part C) from diagnosis to age 3: PT, OT, speech.

— School-based services (IEP under IDEA) from age 3.

— Speech therapy especially for articulation given macroglossia and hypotonia.

— Adaptive PE, social skills training, vocational rehab in adolescence.

— Use person-first language ("child with Down syndrome," not "Down's child").

— Emphasize strengths and individual variability; avoid prognostic absolutes.

— Address sibling impact, parental mental health, marital stress.

— Discuss recurrence risk: ~1% above maternal age baseline for nondisjunction; substantially higher for translocation carriers — refer for genetic counseling before next pregnancy.

Visit cadence:

Monitoring parameters to track in the chart:

Rehab and therapy:

Family counseling cornerstones:

Board pearl: When a parent asks "What will my child be able to do?" the evidence-based answer is that most individuals with DS achieve functional literacy, hold supported employment, form meaningful relationships, and live semi-independently with appropriate supports. Avoid both falsely optimistic and falsely pessimistic framing; provide concrete resources and a long-term plan.

Ethical, Legal, and Patient Safety Considerations

— Counseling must be non-directive, balanced, and accurate — provide updated outcome data (life expectancy ~60 yr, high rates of community participation) alongside medical realities. Studies show termination rates fall when counseling is comprehensive rather than focused on negatives.

— Offer connection to families raising children with DS and to the Down syndrome diagnosis network during prenatal counseling.

— Most adults with DS have mild–moderate intellectual disability; capacity is decision-specific, not global. A person may consent to a flu shot but need support for surgical consent.

— Default to supported decision-making over plenary guardianship when possible — preserves autonomy and dignity.

— Sexual consent and reproductive decisions require especially careful capacity discussion.

— Individuals with intellectual disability face substantially higher rates of physical, sexual, and financial abuse. Clinicians are mandated reporters; maintain a high index of suspicion for unexplained injuries, behavior change, or caregiver inconsistency. In adults, report to Adult Protective Services.

— 18th birthday cliff: parents lose automatic decision-making authority unless legal planning has occurred — proactively address by age 14–16.

— Pediatric-to-adult transfer: send a structured summary; the adult PCP must own the surveillance schedule going forward.

— Hospital handoffs: communication boards, familiar caregivers at bedside, and explicit accommodation plans reduce error.

Prenatal diagnosis ethics:

Informed consent and capacity:

Mandatory reporting:

Transitions of care risks:

Anesthesia safety: cervical positioning and airway anatomy are exam-classic safety issues.

Health equity: adults with DS were historically denied transplants and ICU-level care; current ethical and legal standards (ADA) prohibit such discrimination — disability is not an acceptable sole criterion for withholding life-sustaining therapy.

Step 3 management: When a 17-year-old with DS needs spinal surgery and the parents sign consent without involving the patient, pause — the patient must be involved at her developmental level, and post-18 decision-making structure must be addressed before discharge.

High-Yield Associations and Rapid-Fire Clinical Facts

Maternal age 35 → quad screen pattern: ↓AFP, ↓estriol, ↑hCG, ↑inhibin A = trisomy 21.

cfDNA = best noninvasive screen for T21 (>99% sensitivity), but still requires karyotype to diagnose.

Most common CHD in DS = complete AVSD; most common GI anomaly = duodenal atresia ("double bubble").

Brushfield spots = speckled iris, classic DS exam finding.

Hematologic: TAM in neonate → 20–30% develop AMKL by age 4; lifetime ALL and AMKL risk markedly increased; solid tumors decreased.

Hypothyroidism screen: TSH at birth, 6 mo, 12 mo, then annually for life.

Polysomnogram by age 4 for every child with DS regardless of symptoms.

Atlantoaxial instability: image only if symptomatic; do not screen asymptomatic children with routine films.

Alzheimer disease in DS = early onset (40s–50s); driven by triplicated APP gene on chr 21.

Anesthesia: smaller ETT, neck protection, bradycardia with induction.

Robertsonian translocation der(14;21) → parental karyotype mandatory; 10–15% recurrence if mother is carrier.

Infantile spasms more common in DS but respond well to ACTH/vigabatrin.

Hirschsprung disease ~50× more common in DS than general population.

Celiac disease 5–15% in DS — test symptomatic children with tTG-IgA + total IgA.

Testicular germ cell tumors increased in adult men with DS — annual exam.

COVID-19 mortality substantially higher in adults with DS — priority for vaccination.

Life expectancy ~60 years today.

Women with DS are subfertile, not infertile; 50% transmission to offspring.

Men with DS are typically infertile.

Board pearl: A neonate with DS, bilious emesis, and a "double bubble" on x-ray has duodenal atresia — make NPO, NG decompression, IV fluids, surgical consult, and confirm karyotype if not already done.

Board Question Stem Patterns

Stem 1 — newborn nursery: Term infant with hypotonia, upslanting palpebral fissures, single palmar crease, and a quiet precordium. Best next step? → Echocardiogram (AVSD can be silent in first weeks).

Stem 2 — feeding intolerance: DS neonate with bilious emesis at 18 hours of life and a "double bubble" on abdominal x-ray. Diagnosis? → Duodenal atresia. Next step: NG decompression, IV fluids, surgical consult.

Stem 3 — quad screen: 38-year-old G2P1 at 16 weeks with ↓AFP, ↓estriol, ↑hCG, ↑inhibin A. Best next step? → Offer cfDNA (or proceed to amniocentesis for diagnosis if patient wants definitive answer).

Stem 4 — behavioral regression: 14-year-old with DS, declining school performance, weight gain, fatigue. Next step? → Check TSH (and consider OSA screen, hearing test) before invoking depression or cognitive decline.

Stem 5 — sports clearance: DS child wants to play soccer; parents ask about cervical x-rays. Answer? → Routine screening films not recommended; perform thorough neuro exam; image only if symptoms.

Stem 6 — neonatal CBC: Term DS infant with WBC 65,000 and circulating blasts. Diagnosis? → Transient abnormal myelopoiesis; usually resolves but warrants hematology follow-up due to AMKL risk.

Stem 7 — anesthesia: DS child going for T&A — most important pre-op consideration? → Cervical spine neurologic exam and atlantoaxial precautions during intubation; also confirm recent echo.

Stem 8 — adult cognitive decline: 42-year-old with DS, new forgetfulness and seizures. Workup? → TSH, B12, depression screen, OSA reassessment, MRI brain; Alzheimer disease is likely but rule out reversible causes first.

Stem 9 — recurrence risk: Child diagnosed with DS due to translocation t(14;21). Next step? → Parental karyotyping to determine carrier status and recurrence risk.

CCS pearl: When a CCS case opens with a newborn DS infant, your highest-yield early orders are echocardiogram, karyotype, CBC with differential, TSH, hearing screen (ABR), ophthalmology consult, and genetics consult, plus a feeding evaluation. Skipping the echo before discharge is the most common scored omission.

One-Line Recap

High-yield recap bullets:

Down syndrome care is a structured, lifelong, multisystem surveillance program — anchor on the AAP schedule, treat comorbidities aggressively (CHD, hypothyroidism, OSA, hearing/vision, celiac, leukemia, Alzheimer disease), and partner with families using person-first, evidence-based counseling.

Newborn bundle: confirm karyotype, echocardiogram before 1 month, CBC with diff, TSH, ABR hearing screen, red reflex/ophtho, feeding eval, genetics, early intervention referral.

Lifelong surveillance: annual TSH, CBC, audiology and ophthalmology on schedule, PSG by age 4, celiac if symptomatic, atlantoaxial neuro exam at every visit (image only if symptomatic), baseline adult cognitive assessment by age 30 with annual dementia screening from 40.

High-impact interventions: AVSD repair by 3–6 months prevents Eisenmenger; adenotonsillectomy + CPAP treats OSA-driven morbidity; levothyroxine for hypothyroidism reverses many "developmental regressions"; vaccinations including annual flu, RSV if eligible, and COVID-19 reduce mortality.

Step 3 priorities: non-directive prenatal counseling, transition-of-care planning by age 14 with guardianship/supported decision-making addressed before 18, anesthesia safety with cervical spine and airway precautions, mandatory reporting awareness given elevated abuse risk, and rejection of disability-based denial of life-sustaining care.

Board pearl: When in doubt about any new symptom — cognitive, behavioral, or physical — in a patient with Down syndrome at any age, the reflex move is TSH, CBC, hearing, vision, OSA, and celiac screen before reaching for a neurodevelopmental or psychiatric label, because the reversible causes are common and the irreversible ones are rare by comparison.