Bronchiolitis

Key Points

• Bronchiolitis is acute lower-airway inflammation of the bronchioles, most commonly caused by RSV.
• Infants, especially premature or very young infants, have higher risk for severe respiratory distress.
• Disease progression often starts with upper-respiratory symptoms, then moves to lower-airway distress over 2 to 3 days.
• Core RN priorities are airway/oxygenation support, hydration monitoring, and early recognition of complications.

Pathophysiology

Bronchiolitis occurs when viral infection injures bronchiolar epithelial cells, impairs ciliary function, and triggers inflammation. Edema and mucus burden narrow small airways and increase resistance to airflow.

As airflow limitation worsens, clients can develop tachypnea, increased work of breathing, and hypoxemia. In infants with limited respiratory reserve, this progression can become severe quickly.

Classification

• Typical viral bronchiolitis: Most often RSV-related, with rhinovirus, metapneumovirus, adenovirus, coronavirus, or parainfluenza as alternatives.
• Severity class: Mild home-manageable illness versus severe illness requiring hospitalization for oxygenation and hydration support.
• High-risk profile: Prematurity, age under 5 months, chronic lung disease, immunosuppression, close-quarter exposure, and tobacco-smoke exposure.

Nursing Assessment

NCLEX Focus

In pediatric bronchiolitis, trend breathing effort and feeding tolerance together; worsening in either may indicate deterioration.

• Identify early upper-airway symptoms (cough, rhinorrhea, fever) and track progression timing.
• Monitor for lower-airway distress signs: crackles, wheezing, rhonchi, retractions, grunting, cyanosis, and dyspnea.
• Trend respiratory rate/pattern, pulse oximetry, and accessory-muscle use.
• Assess intake and output closely for dehydration risk, including dry mucous membranes and reduced skin turgor.
• In infants, monitor for irritability and poor feeding as early decompensation cues.
• In premature infants or infants younger than 2 months, assess for apnea because it may be an early presenting severe sign.
• Watch for complications such as pneumonia, pneumothorax, and severe respiratory failure requiring escalation.
• Recognize bronchiolitis as primarily a clinical diagnosis; severe cases may require ABG evaluation for intubation planning.

Nursing Interventions

• Provide supportive care based on severity and hydration status.
• Administer prescribed humidified oxygen and titrate to maintain ordered goals, including SpO2 greater than 90% when specified.
• Support secretion and edema management with ordered nebulized hypertonic saline in hospitalized severe cases.
• Assist with suctioning strategies as ordered (including deep suctioning for heavy secretion burden and pre-feed suctioning to improve intake).
• Administer prescribed fluids and antipyretics; prioritize oral hydration when tolerated and use IV hydration when intake is inadequate.
• Position infants upright and elevate the head of bed for children to improve lung expansion and gas exchange.
• Cluster care and reduce prolonged crying to limit fatigue and oxygen demand.
• Perform frequent reassessment of respiratory status and escalate for ICU/intubation readiness in very severe deterioration.
• Teach caregivers infection-control steps (hand hygiene, respiratory etiquette, cleaning shared surfaces/toys).
• Teach smoke-exposure avoidance and feeding support strategies, including nasal suctioning before infant feeds and small frequent meals.
• Reevaluate outcomes at each reassessment/diagnostic update and revise the care plan when outcomes are partially met or unmet.

Deterioration Risk

Rising work of breathing, persistent hypoxemia, cyanosis, or worsening feeding intolerance requires urgent escalation.

Pharmacology

Drug Class	Examples	Key Nursing Considerations
analgesics/antipyretics	Acetaminophen, ibuprofen	Symptom support for fever and comfort to improve intake tolerance.
Hypertonic saline therapy	Nebulized 3% saline (ordered)	Can reduce airway edema and secretion viscosity in hospitalized severe cases.
oxygen-therapy	Humidified oxygen	Titrate to target oxygenation; monitor for escalating respiratory support need.

Bronchiolitis management is primarily supportive; medication use is directed at symptom relief and respiratory stabilization.

Clinical Judgment Application

Clinical Scenario

A 4-month-old with RSV bronchiolitis develops retractions, grunting, SpO2 89%, and poor feeding.

• Recognize Cues: Lower-airway distress, hypoxemia, and hydration risk.
• Analyze Cues: Airway edema and secretion burden are increasing with declining reserve.
• Prioritize Hypotheses: Immediate priorities are oxygenation and prevention of respiratory failure/dehydration.
• Generate Solutions: Escalate respiratory support, optimize positioning, and reinforce feeding/suction strategy.
• Take Action: Apply ordered humidified oxygen, monitor continuously, and coordinate severe-case management.
• Evaluate Outcomes: Work of breathing decreases, SpO2 improves above target, and feeding tolerance increases.

Related Concepts

• respiratory-viral-infections - RSV and other viral etiologies linked to bronchiolitis.
• thorax-and-lung-assessment-breath-sounds-and-respiratory-patterns - Respiratory-effort and adventitious-sound assessment framework.
• pneumothorax - Potential severe complication requiring urgent recognition.
• pneumonia - Infectious complication risk in clinical deterioration.
• oxygen-therapy - Core escalation pathway for hypoxemia support.

Self-Check

1. Which assessment findings suggest bronchiolitis has progressed from mild to severe?
2. Why is feeding tolerance a critical nursing outcome in infants with bronchiolitis?
3. What caregiver teaching reduces both transmission risk and respiratory workload at home?