Presenting History
In infants and young children presenting with stridor (harsh, high-pitched vibratory sound caused by turbulent airflow through a narrowed upper airway), systematically analyze the timing, sound pitch, postural variations, feeding relationship, and red flag emergency symptoms.
- Characteristics of the Stridor:
- Onset & Age: Present at birth, within first 2 to 4 weeks of life (congenital), or acute onset in an older child?
- Phase of Respiration:
- Inspiratory Stridor: Supraglottic lesion (laryngomalacia, vocal cord paralysis, thyroglossal cyst).
- Biphasic Stridor: Glottic / Subglottic lesion (subglottic stenosis, vascular ring, subglottic hemangioma).
- Expiratory Stridor / Wheeze: Intrathoracic trachea / main bronchi (tracheomalacia, foreign body).
- Pitch & Quality: Low-pitched fluttering/rattling (supraglottic) vs high-pitched piercing/crowing (glottic/subglottic).
- Modulating & Dynamic Factors:
- Positional Variation: Does it worsen in supine position and dramatically improve in prone position with neck extended (hallmark of laryngomalacia)?
- Activity & Agitation: Does the stridor intensify during crying, agitation, or feeding, and quieten during restful deep sleep?
- Infection: Did the stridor abruptly worsen following a mild upper respiratory infection?
- Associated Airway & Craniofacial Features:
- Voice & Cry Quality: Normal, crisp, loud cry (supraglottic/laryngomalacia) vs weak, hoarse, muffled, or aphonic cry (glottic/vocal cord palsy).
- Barking Cough: Brassy, seal-like barking cough (croup / subglottic lesion).
- Feeding Difficulties & Aspiration:
- Choking, sputtering, nasal regurgitation, prolonged feeding times ($>45\text{ minutes}$), or recurrent aspiration pneumonias?
- Cutaneous Vascular Lesions:
- History of cutaneous "strawberry" infantile hemangiomas in a "beard distribution" (mandible, neck, lips) pointing to subglottic hemangioma?
Negative History (3C 1D Framework)
| Category | Pertinent Negative Question | Rationale / Significance |
|---|---|---|
| Causes | Foreign Body Aspiration: No history of choking while feeding solids or playing with small toys. Infectious Croup / Epiglottitis: No high fever, drooling of saliva, tripoding, toxic appearance, or acute onset over hours. Endotracheal Intubation: No prior NICU admission, prolonged mechanical ventilation, or airway instrumentation. | Rules out acute aspirated foreign body. Differentiates acute infective laryngotracheobronchitis or acute epiglottitis. Acquired subglottic stenosis typically occurs post-prolonged neonatal endotracheal intubation. |
| Complaints (Differentiating) | Vascular Ring / Double Aortic Arch: No persistent dysphagia with solid feeds, recurrent aspiration, or hyperextended neck posture. Laryngeal Web: Cry is loud and clear, not hoarse or aphonic since the first day of life. Bilateral Vocal Cord Palsy: No severe acute aphonia, cyanosis at birth, or Chiari malformation / hydrocephalus. | Differentiates extrinsic tracheal compression by aberrant vessels. Differentiates congenital anterior glottic web. Differentiates neurogenic bilateral vocal cord abductor paralysis. |
| Complications | Severe Airway Obstruction / Apnea: No apneic spells, cyanotic episodes, bradycardia, or loss of consciousness. Failure to Thrive / Dysphagia: No persistent drop in weight percentiles due to excessive work of breathing. Pectus Excavatum: No progressive sternal depression from chronic negative intrathoracic pressure swings. | Immediate criteria for surgical intervention (supraglottoplasty). Assesses high caloric cost of respiratory distress. Assesses severe chronic supraglottic collapse. |
| Differentials | Tracheomalacia: No expiratory 'seal-like' honking cough with normal inspiratory phase. Macroglossia / Micrognathia: No retrognathia, glossoptosis, or cleft palate (Pierre Robin Sequence). | Differentiates lower tracheal intrathoracic collapse. Differentiates anatomical pharyngeal airway obstruction. |
Other Relevant History
- Birth & Perinatal History: Birth weight, gestational age, APGAR scores, history of birth trauma, NICU stay, duration of oxygen / CPAP / intubation.
- Feeding History: Breastfeeding duration, feeding frequency, interruptions, sweating during feeds, and cyanotic spells.
- Developmental History: Attainment of head control, social smile, visual tracking.
- Family History: Family history of airway malformations, congenital syndromes, or infant deaths.
History Summary
"Master/Miss `Patient Name`, a `Age in weeks/months` old `male/female` infant, `Birth Order` born term/preterm to a `consanguineous/non-consanguineous` couple, presented with a `Duration in weeks` history of high-pitched inspiratory musical sound noted since `Age of onset` of life, which worsens characteristically in the supine position, during crying and feeding, and ameliorates in the prone position with neck extension, with a normal, loud, crisp cry and absence of cyanotic spells, foreign body aspiration, fever, or prior endotracheal intubation.
In view of the early neonatal onset of variable, position-dependent inspiratory stridor with preserved voice and normal cry, I would like to consider a provisional diagnosis of Congenital Stridor secondary to Supraglottic Airway Anomaly, most likely Laryngomalacia, currently mild-to-moderate, without severe airway compromise, cor pulmonale, or failure to thrive."
General & Head-to-Toe Examination
- Child Behavioral State & Airway Dynamics:
- Observe infant at rest, in mother's lap: note whether quiet breathing produces stridor.
- Evaluate stridor during dynamic positional changes (supine vs prone vs upright).
- Vitals & Signs of Respiratory Distress:
- Heart rate, respiratory rate, SpO2 on room air, presence of suprasternal, substernal, and intercostal retractions.
- Head & Craniofacial Inspection:
- Craniofacial morphology: Micrognathia, retrognathia, high arched palate, cleft palate.
- Cutaneous examination: Inquire and inspect for "beard distribution" hemangiomas.
- Thorax: Inspect for progressive pectus excavatum (indrawn sternum).
Systemic Examination
Respiratory System
- Inspection: Sternal retractions, inspiratory indrawing of soft tissues of neck and suprasternal notch, absence of stridor-free breathing in severe obstruction.
- Palpation: Trachea midline, no palpable tracheal mass or thrill.
- Auscultation:
- Characterize sound over anterior neck (larynx/trachea) vs chest wall.
- Pure inspiratory musical harsh sound loudest over the larynx, conducted to lung fields.
- Symmetrical air entry bilaterally; absence of localized crackles or persistent expiratory wheezes.
Cardiovascular System
- Heart rate, heart sounds ($S_1, S_2$ normal; no loud $P_2$ indicating pulmonary hypertension), absence of murmurs (rule out associated congenital heart disease / vascular ring).
Final Summary & Diagnosis
"A `Age in weeks/months` old `male/female` infant presenting with early-onset chronic inspiratory stridor, with examination demonstrating high-pitched inspiratory sound exacerbated in the supine posture and during agitation, relieved in the prone position, with mild suprasternal and subcostal indrawing, a normal crisp phonatory cry, absence of cutaneous hemangiomas, and good weight gain without hypoxemic episodes.
My final clinical diagnosis is Congenital Stridor secondary to Laryngomalacia (Omega-shaped epiglottis / redundant arytenoid mucosa), mild-to-moderate without severe airway compromise, pending confirmatory flexible fiberoptic laryngoscopy (FFL)."