II. Pathophysiology

  1. Turbulent air flow in a partially obstructed upper airway results in a high pitched sound
  2. Location of obstruction determines inspiratory or biphasic timing
    1. Obstruction above the glottis results in Inspiratory Stridor
    2. Obstruction at or immediately below the glottis results in both inspiratory and expiratory Stridor (Biphasic Stridor)

III. Epidemiology

  1. Most common in younger children
    1. A child's small airways are impacted most significantly by even relatively small partial obstructions
    2. Airway diameter reduction of 25% results in a cross-sectional airway reduction of 50%

IV. Precautions

  1. See Awake Nasotracheal Intubation
  2. Maintain airway and consider differential diagnosis
  3. Ready all airway management equipment (RSI, intubation, failed airway)

V. Causes: Stridor under age 6 months

VI. Causes: Congenital

  1. Choanal Atresia
  2. Maxillofacial dysplasia
  3. Vascular anomalies (e.g. Vascular Ring)
  4. Laryngeal or tracheal abnormalities
  5. Laryngomalacia
  6. Tracheomalacia
  7. Bronchomalacia

VIII. Causes: Neoplasm

  1. Airway Papilloma
  2. Airway Hemangioma

IX. Causes: Neurogenic

XI. Causes: Allergy

  1. Spasmodic Croup
  2. Angioneurotic edema

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Ontology: Stridor (C0038450)

Definition (NCI_CTCAE) A disorder characterized by a high pitched breathing sound due to laryngeal or upper airway obstruction.
Definition (NCI) A symptom resulting from laryngeal obstruction. It is characterized by a high pitched breathing sound.
Concepts Sign or Symptom (T184)
MSH D012135
ICD9 786.1
ICD10 R06.1
SnomedCT 207064008, 158382006, 70407001
LNC LA17612-5
English Stridors, STRIDOR, [D]Stridor (context-dependent category), [D]Stridor, stridor (physical finding), stridor, stridor was observed, stridors, [D]Stridor (situation), Stridulous breathing, Stridor (finding), Stridor
Portuguese ESTRIDOR, Estridor
Spanish ESTRIDOR, [D]estridor (categoría dependiente del contexto), Estridor, [D]estridor, [D]estridor (situación), estridor (hallazgo), estridor, respiración estridulosa
Italian Stridore
Japanese 上気道性喘鳴, ジョウキドウセイゼンメイ
French Stridor, STRIDOR
German Stridor, STRIDOR
Czech Stridor, stridor
Korean 그렁거림
Hungarian Stridor
Norwegian Stridor, Hes piping
Dutch stridor, Stridor