Upper Respiratory Tract Infections

Upper Respiratory Tract Infections

Upper Respiratory Tract Infections

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URTI Overview - Cold Facts First

  • Etiology (Common Viruses):
    • Rhinovirus (most frequent agent)
    • Adenovirus, RSV, Coronavirus
    • Influenza, Parainfluenza viruses
  • Clinical Features:
    • Rhinorrhea (clear to mucopurulent)
    • Cough, sore throat
    • Nasal congestion, sneezing
    • Low-grade fever (typically < 38.5°C), malaise
  • Symptomatic Management:
    • Adequate hydration (oral fluids)
    • Antipyretics (e.g., Paracetamol) for fever/pain
    • Saline nasal drops or spray for congestion
    • Rest; humidified air
  • Red Flags ⚠️ (Indicating Complications):
    • High fever (> 39°C) or fever persisting > 3 days
    • Respiratory distress (tachypnea, retractions, nasal flaring)
    • Severe ear pain (otitis media), facial pain/swelling (sinusitis)
    • Lethargy, irritability, poor oral intake, dehydration
    • Symptoms worsening or no improvement after 7-10 days

⭐ Rhinovirus is the most common cause of the common cold.

Pharyngitis - Strep Throat Drama

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Otitis & Sinusitis - Ear-itating Pains

Acute Otitis Media (AOM):

  • Pathogens: S. pneumoniae, H. influenzae, M. catarrhalis (📌 SHiM).
  • Features: Otalgia, fever, red bulging Tympanic Membrane (TM). Otoscopic views of tympanic membrane in otitis media
  • Management: Analgesia. Amoxicillin 80-90 mg/kg/day if severe/bilateral <2yrs/no improvement after observation.

⭐ Most common bacterial pathogens in AOM are Streptococcus pneumoniae, non-typeable Haemophilus influenzae, and Moraxella catarrhalis.

AOM Management Algorithm:

AOM vs. Otitis Media with Effusion (OME):

FeatureAOMOME
SymptomsAcute otalgia, feverHearing loss, fullness, often asymptomatic
TMBulging, erythematous, ↓ mobilityRetracted/neutral, air-fluid levels, ↓ mobility
  • Pathogens: Viral (most common); Bacterial: S. pneumoniae, H. influenzae.
  • Features: Persistent (>10 days) purulent nasal discharge, facial pain/pressure, fever.
  • Management: Symptomatic. Amoxicillin-clavulanate for suspected bacterial cases.

Laryngeal Alerts - Bark, Stridor, Action!

Croup (Laryngotracheobronchitis) vs. Epiglottitis

FeatureCroup (Laryngotracheobronchitis)Epiglottitis
EtiologyParainfluenza virus (commonest)Strep/Staph (post-Hib era)
OnsetGradual (days)Rapid (hours)
CoughBarking (📌 SEAL-like)Minimal/absent
StridorInspiratoryInspiratory, muffled cry/voice
FeverLow-gradeHigh
DroolingUncommonProminent (📌 4 D's: Dysphagia, Dysphonia, Drooling, Distress)
DysphagiaMildSevere
PositionVariableTripod/Sniffing
X-ray (Neck)Steeple sign (AP view)Thumbprint sign (Lateral view)
ManagementDexamethasone (0.6 mg/kg), Neb. Epinephrine (for mod-severe)⚠️ Airway emergency! Intubate in OR, IV Abx (e.g., Ceftriaxone)

⭐ The 'thumbprint sign' on lateral neck X-ray is characteristic of epiglottitis.

Approach to Stridor:

High‑Yield Points - ⚡ Biggest Takeaways

  • Common cold (rhinovirus): Most frequent URTI, symptomatic treatment.
  • AOM: Often post-viral URTI; S. pneumoniae is a key pathogen.
  • GAS Pharyngitis: Treat with Penicillin V to prevent rheumatic fever; Centor criteria aid.
  • Epiglottitis: 3Ds (Drooling, Dysphagia, Distress), tripod position, thumb sign; airway emergency.
  • Croup: Parainfluenza virus; barking cough, inspiratory stridor, steeple sign.
  • Diphtheria: Greyish pseudomembrane, bull neck; antitoxin + antibiotics vital.

Practice Questions: Upper Respiratory Tract Infections

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4 year old male, recurrent URTI, has difficulty breathing, High arched palate, Failure to grow and impaired hearing, management is

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Flashcards: Upper Respiratory Tract Infections

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_____ presents with a hoarse, 'seal bark' cough and inspiratory stridor

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_____ presents with a hoarse, 'seal bark' cough and inspiratory stridor

Laryngotracheobronchitis (croup)

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