Presenting History
In infants presenting with suspected Down Syndrome (Trisomy 21), elicit the maternal age at conception, neonatal floppiness, feeding performance, developmental delay, recurrent respiratory infections, and cardiac failure symptoms.
- Hypotonia & Floppiness Since Birth:
- Did the baby feel unusually limp, loose, and heavy like a "rag doll" when handled or bathed?
- Did the infant slip through the caregiver's hands when lifted under the axillae (slip-through sign)?
- Developmental Delay:
- Inquire regarding gross motor milestones: neck holding, rolling over, sitting without support.
- Assess social smile, visual tracking, and vocalization.
- Feeding Difficulties & Cardiac Failure Triad:
- Does the infant tire easily during breastfeeding, taking only 1-2 minutes before stopping to breathe (suck-rest-suck cycle)?
- Is there profuse sweating over the forehead and temples during feeding (diaphoresis)?
- Is there persistent fast breathing (tachypnea) and poor weight gain despite frequent feeds?
- Recurrent Lower Respiratory Tract Infections:
- Has the baby experienced frequent episodes of cough, wheezing, and chest retractions requiring hospitalization (pulmonary overcirculation)?
Negative History (3C 1D Framework)
| Category | Pertinent Negative Question | Rationale / Significance |
|---|---|---|
| Causes | Maternal Age: Note maternal age at conception ($>35$ years exponentially increases risk of meiotic nondisjunction). Antenatal Screening: Inquire if combined screening, triple/quadruple test, or anomaly ultrasound was performed. | $95\%$ of Down syndrome is free Trisomy 21 due to maternal meiotic nondisjunction. Assesses antenatal missed opportunities for pre-test counseling. |
| Complaints (Differentiating) | GI Obstruction: No history of persistent bilious vomiting or obstinate constipation. Epileptic Spasms: No history of sudden, repetitive flexor spasms occurring in clusters upon waking. | Duodenal atresia and Hirschsprung disease are common congenital GI anomalies in Down syndrome. Infantile spasms (West syndrome) occur with increased frequency and require early vigabatrin/ACTH. |
| Complications | Cyanosis: No history of blue discoloration of lips or tongue during crying (rules out Eisenmenger syndrome / TOF). Bleeding Diathesis / Pallor: No history of easy bruising, petechiae, or extreme pallor. Neck Pain / Quadriparesis: In older children, no history of torticollis, change in gait, or hyperreflexia. | Large AVSD can develop early irreversible pulmonary vascular disease (Eisenmenger) by 6-12 months. Down syndrome has high risk of Transient Myeloproliferative Disorder (TMD) and Acute Leukemia (ALL / AMkL). Screen for Atlantoaxial Instability (AAI) due to ligamentous laxity. |
| Differentials | Congenital Hypothyroidism: No coarse features, dry cold skin, hoarse cry, or open posterior fontanelle. Prader-Willi Syndrome: No cryptorchidism or microphallus; PWS lacks facial mongoloid slant and cardiac defects. | Hypothyroidism shares hypotonia and macroglossia, but lacks Hall's cardinal dysmorphic signs. Differentiates other causes of neonatal hypotonia. |
Other Relevant History
- Family History & Pedigree: Maternal and paternal ages, prior miscarriages, chromosomal abnormalities in siblings.
- Feeding & Growth History: Plot growth on Down Syndrome-Specific Growth Charts.
- Immunization History: Complete UIP schedule; seasonal influenza and pneumococcal boosters recommended.
History Summary
"Master/Miss `Patient Name`, a `Age in months` old `male/female` infant, `Birth Order` born to a `Maternal Age` year old mother from `City, State`, presented with generalized hypotonia and floppiness since birth, gross motor developmental delay, feeding fatigue with suck-rest-suck cycle, profuse forehead sweating, and recurrent chest infections, in the absence of cyanosis, bilious vomiting, or infantile spasms.
In view of the generalized hypotonia, dysmorphic facial features, and symptoms of cardiac failure, I would like to consider a provisional diagnosis of Down Syndrome (Trisomy 21), complicated by Acyanotic Congenital Heart Disease (most likely Atrioventricular Septal Defect / AVSD) with a large left-to-right shunt in active Congestive Cardiac Failure, requiring medical heart failure control and cytogenetic confirmation."
General & Head-to-Toe Examination
- Child Behavioral State: Assess Prechtl state (placid, non-irritable, socially responsive).
- Vitals: Heart rate (tachycardia $>140\text{ bpm}$), respiratory rate (tachypnea $>50\text{ bpm}$), $SpO_2$ (normal $>95\%$ in acyanotic shunt), blood pressure.
- Anthropometry: Plot weight, length, and head circumference on Down-specific growth charts (microcephaly with brachycephaly is common).
- Hall's 10 Diagnostic Signs for Down Syndrome (Check Systematically):
- Flat facial profile with depressed nasal bridge.
- Upslanting palpebral fissures (Mongoloid slant).
- Prominent inner epicanthal folds.
- Small, dysplastic, low-set ears with folded superior helix.
- Brushfield spots in peripheral iris.
- Protruding tongue through small oral cavity (relative macroglossia).
- Loose, redundant skin on posterior nape of neck.
- Brachydactyly and clinodactyly of 5th digit (hypoplastic middle phalanx).
- Single transverse palmar crease (Simian Crease) bilaterally.
- Sandal gap (wide gap between 1st and 2nd toes with deep plantar crease).
- Generalized muscular hypotonia and hyperflexibility. (Presence of $\ge 6/10$ signs establishes clinical diagnosis with $>99\%$ confidence).
Systemic Examination
Cardiovascular System (CVS)
- Precordium hyperactive; palpable parasternal heave (RV overload); apex displaced laterally; wide, fixed split $S_2$ with loud $P_2$; Grade 3/6 pansystolic murmur at left lower sternal border; apical mid-diastolic rumble.
Abdomen
- Symmetrically full; soft; Hepatomegaly ($>3\text{ cm}$ below costal margin with firm smooth edge confirms Congestive Cardiac Failure); spleen not palpable.
Respiratory System
- Tachypneic with subcostal retractions; bilateral fine basal inspiratory crepitations (pulmonary congestion).
Central Nervous System (CNS) - Hypotonia Assessment
- Axial Tone: Complete head lag on pull-to-sit; inverted-U on ventral suspension.
- Appendicular Tone: Scarf sign crosses contralateral axilla; heel-to-ear test easily performed without resistance.
- Deep tendon reflexes sluggish ($1+$ bilaterally); plantars flexor.
Final Summary & Diagnosis
"A `Age in months` old `male/female` infant born to a `Maternal Age` year old mother, presenting with generalized hypotonia, gross motor delay, and failure to thrive, with physical examination revealing `Number of signs`/10 Hall's diagnostic signs, and cardiovascular examination demonstrating active Congestive Cardiac Failure (tachycardia, tachypnea, hepatomegaly `cm`, wide fixed split $S_2$, and pansystolic murmur).
My final diagnosis is Down Syndrome (Trisomy 21), complicated by Acyanotic Congenital Heart Disease (Complete Atrioventricular Septal Defect / AVSD) with large left-to-right shunt in active Congestive Cardiac Failure (Modified Ross Class III), requiring urgent medical heart failure therapy, early surgical repair, and karyotypic confirmation."