Eduovisual
Pediatrics (System-Integrated)
Bronchiolitis: outpatient and inpatient management
— Peak incidence 2–6 months; rare >2 years (consider alternative diagnoses).
— Seasonal: late fall through early spring in temperate US climates; RSV peaks December–February.
— Leading cause of infant hospitalization in the United States (~2–3% of infants <1 year hospitalized annually).
— RSV (~60–70%) — causative organism in most hospitalized cases.
— Rhinovirus (often associated with later asthma development).
— Human metapneumovirus, parainfluenza, influenza, adenovirus, coronaviruses (including SARS-CoV-2), bocavirus.
— Co-infection in up to 30%; does not change management.
— Infant <24 months with viral prodrome (rhinorrhea, low-grade fever, cough) progressing on day 3–5 to tachypnea, wheezing, crackles, and retractions.
— Feeding difficulty, fussiness, apnea (especially in infants <2 months or ex-premies).
— Age <12 weeks
— Prematurity (<29 weeks particularly)
— Hemodynamically significant congenital heart disease
— Chronic lung disease/BPD
— Immunodeficiency
— Neuromuscular disease
— Exposure to tobacco smoke; lack of breastfeeding
Board pearl: Bronchiolitis is a clinical diagnosis — viral testing and chest x-ray are NOT routinely indicated and can lead to unnecessary antibiotic use. The AAP explicitly recommends against routine virologic testing in typical outpatient cases. Suspect alternative diagnosis if first wheezing episode occurs after age 2 or if recurrent; reconsider asthma, foreign body, vascular ring, or cystic fibrosis.
— Days 1–2: URI prodrome — clear rhinorrhea, congestion, low-grade fever (<38.5°C), mild cough, slightly decreased intake.
— Days 3–5: Lower tract progression — paroxysmal cough, audible wheeze, tachypnea, retractions, nasal flaring, grunting, feeding difficulty, irritability.
— Days 5–14: gradual resolution; cough may persist 2–4 weeks.
— Up to 20% of hospitalized infants <2 months, ex-preemies, or those <44 weeks postmenstrual age may present with apnea before respiratory symptoms become prominent.
— Apnea is an admission criterion regardless of other findings.
— Estimate intake as % of baseline. <50–75% of normal intake is a red flag for hospitalization.
— Ask about urine output: <4 wet diapers/24 hours = dehydration.
— Coughing/choking during feeds suggests inability to coordinate suck-swallow-breathe at higher respiratory rates (RR >60 nearly always impairs feeding).
— Gestational age at birth (prematurity is the strongest predictor of severity).
— Cardiac history (CHD with pulmonary overcirculation).
— Prior wheezing episodes (changes differential toward asthma).
— Choking/sudden-onset symptoms (foreign body).
— Sick contacts; daycare attendance; older siblings.
— Immunization status, including nirsevimab (RSV monoclonal) receipt and maternal RSV vaccination.
— Tobacco/vaping exposure in household.
Step 3 management: When triaging an infant with bronchiolitis by phone or in clinic, feeding tolerance, hydration status, and caregiver reliability are as important as respiratory rate in deciding home vs. ED disposition. An infant taking >75% feeds with reliable caregivers and follow-up access can almost always be managed at home, even with mild wheeze.
— Alertness, interactiveness, color, hydration. A lethargic, mottled, or cyanotic infant is sick until proven otherwise.
— Pediatric Assessment Triangle: appearance, work of breathing, circulation.
— Tachypnea: RR >60 (any age <2 mo concerning); >50 (2–12 mo); >40 (1–2 yr).
— Fever usually low-grade; T >38.5°C should prompt search for alternative source, especially UTI in young infants.
— SpO₂: AAP recommends supplemental O₂ only if persistently <90% in otherwise healthy infants (avoid continuous pulse oximetry in stable, non-hypoxic infants — leads to overtreatment and prolonged stays).
— Nasal flaring, grunting (sign of impending failure), suprasternal/intercostal/subcostal retractions, head bobbing, accessory muscle use, abdominal paradox.
— Diffuse fine crackles (most specific finding) ± expiratory wheeze.
— Prolonged expiratory phase.
— Findings can shift dramatically after suctioning or coughing — reassess after nasal suction.
— Asymmetric findings should prompt consideration of foreign body, pneumothorax, or mucus plug atelectasis.
— Mucous membranes, capillary refill, fontanelle, tears, skin turgor, urine output.
— Tachycardia out of proportion to fever suggests dehydration or impending decompensation.
— Apnea, grunting, severe retractions, RR >70 sustained, SpO₂ <90% despite O₂, lethargy, poor perfusion, inability to maintain hydration.
Key distinction: Transient desaturations to 88–89% during sleep are normal in recovering infants and do NOT mandate continued admission. The 2014 AAP guideline and Bronchiolitis Choosing Wisely recommendations specifically target unnecessary continuous pulse oximetry, which prolongs hospitalization without improving outcomes. Use intermittent spot checks in stable patients.
— AAP recommends against routine CXR.
— CXR findings (hyperinflation, peribronchial cuffing, patchy atelectasis) are nonspecific and often misread as pneumonia, driving unnecessary antibiotic use.
— Obtain CXR if: atypical course, severe disease requiring ICU, focal findings, suspected pneumothorax, suspected foreign body, or worsening despite supportive care.
— Does not change management in typical outpatient or floor patients.
— Indications: cohorting on inpatient units, infection control, infants <3 months with fever (to risk-stratify for serious bacterial infection), influenza testing if antiviral therapy considered.
— CBC, CRP, procalcitonin do not reliably distinguish viral from bacterial co-infection in typical bronchiolitis.
— Febrile infant <60–90 days: evaluate per febrile infant pathway (UTI workup, often blood/urine cultures; LP based on age and risk algorithm such as PECARN/AAP 2021).
— Severe disease with respiratory failure: VBG/CBG for CO₂ and pH (not arterial unless necessary).
— Concern for dehydration: BMP for electrolytes (watch for SIADH-like hyponatremia with severe disease).
— Concurrent UTI rate ~1–3% in febrile infants with bronchiolitis — check UA in febrile infants <60 days even with confirmed RSV.
Board pearl: A Step 3 stem describing a wheezing infant who gets a CXR showing "patchy atelectasis" and then "amoxicillin" is testing your willingness to stop antibiotics — atelectasis from mucus plugging mimics pneumonia. Recommend discontinuing antibiotics if started reflexively.
— Venous or capillary blood gas preferred over arterial in infants.
— Order when assessing severity in patients with severe distress, considering ICU transfer, or initiating high-flow/CPAP.
— Rising PCO₂ with fatigue (>55–60 mmHg) and worsening pH (<7.30) signals impending respiratory failure regardless of SpO₂.
— Mixed respiratory acidosis with metabolic acidosis suggests poor perfusion or sepsis.
— Emerging role; sensitive for consolidation, pleural effusion, atelectasis without radiation. Not yet standard of care but increasingly used in EDs.
— Consider if: new murmur, hepatomegaly, persistent tachycardia, suspected pulmonary hypertension, or severe disease with cardiac risk factors. Helps exclude unsuspected CHD presenting as "bronchiolitis."
— Useful for cohorting and infection control in hospitalized patients (RSV vs influenza vs other).
— Detection of multiple viruses does not predict severity; do NOT alter therapy based on co-infection.
— Consider in recurrent or atypical bronchiolitis, failure to thrive, or persistent crackles to evaluate for cystic fibrosis.
— Reserved for suspected airway anomaly, foreign body, or persistent atelectasis unresponsive to therapy.
— Consider in unimmunized infants with paroxysmal cough, post-tussive emesis, or apnea without wheeze.
— Failure to improve by day 5–7 of illness
— Recurrent or persistent oxygen requirement >7 days
— Focal/asymmetric exam findings
— Failure to thrive
Step 3 management: In a hospitalized infant not improving as expected after 4–5 days, the right next step is usually CXR + reconsider differential (CHD, FB, CF, immunodeficiency, atypical pathogens) rather than empirically escalating antibiotics or bronchodilators.
— Age >2 months (or older if ex-premie reaching term equivalence with caregiver competence)
— SpO₂ ≥90% on room air at rest and feeds
— RR appropriate for age, mild work of breathing only
— Tolerating ≥75% of normal oral intake; adequate urine output
— Reliable caregivers with transport, phone, return precautions understood
— Access to follow-up within 24–48 hours
— Persistent SpO₂ <90% on room air
— Moderate-severe respiratory distress (grunting, severe retractions, RR >70 sustained)
— Apnea (witnessed or reported)
— Inability to maintain hydration (intake <50%, signs of dehydration)
— Toxic appearance
— Age <2 months with significant symptoms (low threshold)
— High-risk comorbidity (CHD, BPD, immunodeficiency, neuromuscular disease)
— Social concerns (unreliable follow-up, distance, caregiver capacity)
— Impending or actual respiratory failure (rising PCO₂, fatigue)
— Need for high-flow nasal cannula at maximum settings, CPAP, BiPAP, or intubation
— Recurrent apnea
— Hemodynamic instability/septic appearance
— Nasal suctioning (bulb/saline; avoid aggressive deep suction)
— Hydration (PO if tolerated; IV or NG if not)
— Oxygen if SpO₂ persistently <90%
— Minimal handling to avoid agitation/desaturation
CCS pearl: On a CCS-style bronchiolitis case, the high-yield order set is: continuous cardiopulmonary monitoring (initially), pulse ox (intermittent once stable), saline nasal drops + bulb suction, NPO or small frequent feeds depending on RR, maintenance IVF if RR >60, supplemental O₂ titrated to SpO₂ ≥90%, and respiratory therapy reassessment q4h. Avoid ordering bronchodilators, steroids, antibiotics, or chest physiotherapy reflexively.
— Albuterol/salbutamol: No consistent benefit; do not give. A historical "single trial with objective scoring" was previously suggested but the 2014 update removed this recommendation — routine trial is discouraged. Many boards still accept "no role."
— Racemic epinephrine: No benefit for inpatients; may have short-term benefit in ED but does not change admission rates or length of stay. Not for routine use.
— Systemic or inhaled corticosteroids: No benefit; may prolong viral shedding. Do not give even with family history of asthma.
— Antibiotics: No role unless documented bacterial co-infection (otitis media, UTI, pneumonia with consolidation, or sepsis).
— Chest physiotherapy: Not recommended.
— Hypertonic (3%) saline nebulization: Conflicting data; AAP says may consider for hospitalized patients with anticipated LOS >72h, but most US centers no longer use routinely. NOT for ED/outpatient.
— Montelukast, ipratropium, DNase, heliox: No role.
— Ribavirin: Reserved for severely immunocompromised; not for routine RSV.
— Antipyretics (acetaminophen 15 mg/kg q4–6h; ibuprofen 10 mg/kg q6h if >6 months) for comfort.
— Isotonic IV fluids (D5NS or NS) at maintenance if oral intake inadequate; avoid hypotonic fluids due to SIADH risk.
— Supplemental oxygen titrated to SpO₂ ≥90%.
Board pearl: If a Step 3 stem describes giving "nebulized albuterol and oral prednisolone" to a 6-month-old wheezing with viral prodrome, the correct next step is to stop both and provide supportive care. Steroids and bronchodilators are the most commonly tested wrong answers in bronchiolitis stems.
— Step 1: Nasal suction + positioning. Bulb suction or low-pressure nasopharyngeal suction before feeds and PRN; head-of-bed elevation.
— Step 2: Low-flow nasal cannula O₂ (up to ~2 L/min) titrated to SpO₂ ≥90%.
— Step 3: High-flow nasal cannula (HFNC) — heated, humidified, 1–2 L/kg/min. Reduces work of breathing via PEEP and dead-space washout. First-line escalation on most pediatric floors for infants failing low-flow.
— Step 4: CPAP (5–8 cm H₂O) — for infants failing HFNC or with apnea.
— Step 5: BiPAP or intubation/mechanical ventilation — for respiratory failure, persistent hypercapnia with acidosis, or exhaustion.
— Watch for improvement within 1–2 hours: ↓RR, ↓retractions, ↑SpO₂, ↓HR. Lack of improvement = early indicator for further escalation.
— Can often be delivered on a general floor depending on institutional protocols; high settings require PICU.
— Lung-protective: low tidal volumes (5–7 mL/kg), permissive hypercapnia, adequate expiratory time to avoid auto-PEEP.
— Watch for pneumothorax and air trapping.
— Continuous cardiorespiratory monitoring for infants <2 months or ex-preemies.
— Recurrent apnea → CPAP or intubation; consider PICU.
— NG/OG feeds preferred over IV fluids alone in infants on HFNC who cannot safely PO — provides calories and is generally well tolerated.
— Hold feeds during periods of escalating distress.
Step 3 management: When an infant on HFNC at 2 L/kg/min shows rising PCO₂ (e.g., 62) with pH 7.26 and worsening retractions despite 2 hours of therapy, the next step is escalation to CPAP/BiPAP and PICU transfer, not increasing HFNC further or starting bronchodilators.
— Increased risk of severe disease, apnea, and respiratory failure.
— Low threshold for admission, even with seemingly mild symptoms.
— Eligible for nirsevimab RSV monoclonal prophylaxis.
— Baseline impaired pulmonary reserve; higher hospitalization and ICU rates.
— May have chronic O₂ requirement — establish baseline SpO₂ goal with parents/pulmonologist (often 88–92% at baseline rather than ≥90% in healthy infants).
— Increased monitoring; consider PICU early.
— Highest risk: hemodynamically significant CHD with pulmonary overcirculation (large VSD, AVSD, unrepaired ToF, single ventricle physiology).
— Watch for worsening CHF with viral infection: hepatomegaly, gallop, worsening tachycardia.
— Hypoxia must be interpreted in context — cyanotic CHD baseline saturations may be 75–85%.
— Eligible for nirsevimab.
— Severe combined immunodeficiency, post-transplant, oncologic patients on chemo.
— Ribavirin may be considered for severe RSV in this group (controversial, specialist-driven).
— IVIG sometimes used.
— Strict isolation, low admission threshold.
— Impaired cough/secretion clearance.
— Need aggressive airway clearance, NIV, and early PICU involvement.
— Often have associated CHD, hypotonia, and airway anomalies; treat as high-risk.
— Rare in this age group; adjust fluid management; monitor electrolytes.
Key distinction: A child with cyanotic CHD and baseline SpO₂ of 80% does not require supplemental O₂ during a bronchiolitis admission unless desaturating below baseline. Reflexive O₂ can worsen pulmonary overcirculation in some shunt-dependent physiology. Always confirm baseline saturation goal with parents or cardiology.
— Recommended for ALL infants <8 months entering or born during their first RSV season (typically October–March in US) whose mothers did not receive RSV vaccine ≥14 days before delivery.
— High-risk children 8–19 months (BPD requiring therapy, severe immunocompromise, CF with severe disease, AI/AN children): second-season dosing.
— Dose: 50 mg if <5 kg, 100 mg if ≥5 kg.
— Replaced palivizumab as first-line for most indications (palivizumab still available; monthly dosing).
— Single dose at 32–36 weeks gestation during September–January (seasonal administration).
— Protects infant via transplacental antibody transfer through ~6 months of age.
— Either maternal vaccination OR infant nirsevimab is recommended — not routinely both.
— Nirsevimab is not a vaccine but is administered like one logistically; insurance coverage through VFC program.
— Does NOT prevent all RSV but reduces medically attended LRTI by ~75% and hospitalization by ~80%.
— Breastfeeding (protective, especially exclusive for ≥4 months).
— Hand hygiene; avoid sick contacts.
— Avoid tobacco smoke exposure (single most modifiable risk factor).
— Daycare considerations; cohorting.
— Routine immunizations including influenza (≥6 months) and COVID-19 per current ACIP schedule.
— Document RSV prevention status at every well-child visit during RSV season; coordinate with OB if maternal vaccine considered.
Board pearl: If a stem describes a healthy 3-month-old in November whose mother received the RSV vaccine at 34 weeks gestation, no nirsevimab is needed — maternal vaccine has already conferred protection. Routine "both" administration is not standard.
— Apnea — particularly infants <2 months, ex-preemies; can precede respiratory symptoms.
— Respiratory failure requiring mechanical ventilation (~2–5% of hospitalized; higher in high-risk).
— Dehydration from poor intake + insensible losses through tachypnea.
— SIADH/hyponatremia — relatively common in severe disease; use isotonic IVF, monitor sodium.
— Atelectasis (mucus plugging) — may be mistaken for pneumonia on CXR.
— Pneumothorax/pneumomediastinum — from air trapping, ↑ in mechanically ventilated.
— Secondary bacterial infection:
– Most common: acute otitis media (~50% of hospitalized).
– Bacterial pneumonia uncommon (<1%) without superinfection.
– Bacteremia <1% in typical bronchiolitis.
— Cardiac decompensation in infants with CHD.
— Recurrent wheezing in 30–40% post-bronchiolitis through childhood.
— Asthma: Association strongest with rhinovirus bronchiolitis, possibly causal vs. marker of underlying atopy. RSV bronchiolitis also associated but causality debated.
— Possible mild long-term reduction in pulmonary function.
— Antibiotic-associated diarrhea, C. difficile (rare in young infants but rising).
— Steroid-related hyperglycemia, immune suppression — another reason to avoid.
— Aspiration during forced feeding in severely tachypneic infants.
— Hospital-acquired infections (rotavirus, C. difficile, MRSA).
— Hyponatremia from hypotonic IVF.
Step 3 management: In a hospitalized infant with bronchiolitis whose sodium drops from 138 to 128 over 48 hours on D5½NS at 1.5× maintenance, switch to isotonic fluids and reduce rate to maintenance; consider mild fluid restriction. This is classic SIADH of severe respiratory illness, not "needs more fluids."
— Sustained RR >70, severe retractions, grunting, nasal flaring
— Cyanosis or pallor; lethargy or unusual irritability
— Apneic spells
— Refusing feeds or <50% of normal intake
— <4 wet diapers in 24 hours
— Worsening despite home care after day 5
— Persistent SpO₂ <90% on room air after suctioning and observation
— Sustained moderate-severe distress
— Inability to feed adequately
— Any apnea
— High-risk comorbidity with any abnormality
— Social concerns
— Need for HFNC at high settings (institution-dependent threshold)
— Need for CPAP/BiPAP or intubation
— Recurrent apnea requiring stimulation
— Rising PCO₂ with acidosis (pH <7.30)
— Hemodynamic instability or septic appearance
— Suspected/confirmed pneumothorax
— Worsening despite maximal floor support
— Pediatric pulmonology: atypical course, persistent O₂ requirement >2 weeks, recurrent bronchiolitis, suspected underlying lung disease.
— Cardiology: new murmur, suspected CHF, known CHD with severe disease.
— Infectious disease: immunocompromised host, unusual pathogens, treatment of severe RSV with ribavirin/IVIG.
— Otolaryngology: persistent stridor or suspected airway anomaly.
— Lactation/feeding specialist: poor feeding affecting discharge.
— Stabilize airway/breathing before transfer; consider intubation prior to transport in deteriorating infants — avoid an unplanned airway in the ambulance.
CCS pearl: On a CCS bronchiolitis case, if you see PCO₂ trending from 45 → 55 → 62 with worsening clinical exam over a few hours, transfer to PICU and call respiratory therapy for NIV setup BEFORE intubation becomes emergent. Pre-emptive escalation is rewarded; reactive escalation is punished.
— More likely if ≥3 episodes of wheeze, family history of asthma, atopy (eczema, food allergy), age >12 months.
— Asthma Predictive Index stratifies risk in young children.
— Responds to albuterol and steroids (unlike bronchiolitis) — a positive response supports asthma over bronchiolitis.
— Overlap with both bronchiolitis and asthma phenotypes. Children >12 months with isolated wheeze may benefit from bronchodilator trial in a way that infants under 12 months typically do not.
— Focal crackles, lobar consolidation on CXR, persistently high fever, toxic appearance.
— May coexist with bronchiolitis but uncommon (<1%).
— Paroxysmal cough, post-tussive emesis, inspiratory whoop, apnea in young infants. Often no wheeze.
— Lymphocytosis on CBC.
— Treat with azithromycin.
— History of choking with feeds; consider GERD, swallowing dysfunction, laryngeal cleft, TEF.
— Sudden onset, often unilateral findings, no viral prodrome, age typically >6 months when mobile.
— Inspiratory/expiratory CXR or decubitus films may show air trapping; bronchoscopy definitive.
— Persistent stridor and wheeze unrelated to illness; CT or MR angiography diagnostic.
— Wheeze worse with crying, agitation, feeding; chronic course.
Key distinction: First wheezing episode in an infant <12 months with viral prodrome = bronchiolitis (do NOT trial bronchodilators routinely). Recurrent wheeze in a toddler with family history of asthma and atopy = asthma (DO trial bronchodilators/steroids). Age and recurrence drive the management split.
— Large left-to-right shunt (VSD, PDA, AVSD) often presents at 6–8 weeks as feeding difficulty, tachypnea, diaphoresis with feeds, failure to thrive.
— Look for: hepatomegaly, gallop rhythm, weak pulses, murmur, cardiomegaly on CXR.
— Echocardiography diagnostic.
— May be misdiagnosed as bronchiolitis during peak season.
— Failure to thrive, steatorrhea, recurrent or persistent respiratory symptoms, salty-tasting skin, meconium ileus history.
— Newborn screen typically catches; sweat chloride confirms.
— Rapid onset, exposure history, urticaria, angioedema, hypotension. Treat with IM epinephrine.
— Toxic appearance, age <60 days with fever → full workup including UA/UC, blood culture, and consideration of LP per AAP febrile infant guideline.
— Tachypnea from metabolic acidosis (e.g., organic acidemias, MCAD) can mimic respiratory distress. Check glucose, ammonia, blood gas, anion gap in atypical presentations.
— Kussmaul breathing mistaken for respiratory distress; check glucose.
— Salicylates → tachypnea, metabolic acidosis. Less common in infants but possible with caregiver error.
— Ex-preemie with chronic O₂ needs; baseline status critical for interpreting current presentation.
— Recurrent infections, persistent thrush, failure to thrive — consider SCID, especially with severe RSV.
— Persistent symptoms weeks after adenovirus or severe viral illness; not the acute presentation.
Board pearl: A 6-week-old with "bronchiolitis" who has a holosystolic murmur, hepatomegaly, and cardiomegaly on CXR with increased pulmonary vascular markings is in CHF from a VSD, not bronchiolitis. Order an echocardiogram and start diuresis with cardiology input rather than escalating respiratory support alone.
— Stable respiratory status on room air — typically SpO₂ ≥90% (or back to baseline for chronic lung disease) for several hours including during sleep and feeds.
— Many institutions require 12–24 hours off supplemental O₂ before discharge, especially for infants <3 months.
— RR appropriate for age with mild or no work of breathing
— Tolerating adequate oral intake (≥75% of normal) to maintain hydration
— Adequate urine output (≥4 wet diapers/24h)
— Caregivers educated and demonstrate appropriate suctioning technique
— Reliable follow-up arranged within 24–72 hours (sooner for higher-risk)
— Generally NONE — bronchiolitis requires no chronic therapy.
— Saline nasal drops + bulb suction supply
— Antipyretics PRN for comfort
— Avoid prescribing albuterol, steroids, or antibiotics "just in case."
— Worsening breathing, fast breathing at rest, retractions, blue lips/face
— Apnea or unusual sleepiness
— Refusing feeds or <4 wet diapers in 24h
— Fever >38°C in infant <3 months, or persistent high fever >38.5°C
— Worsening after expected day 5–7 plateau
— Hand hygiene for all household members
— Smoke-free environment — strongest modifiable risk factor; counsel and offer cessation resources
— Breastfeeding encouragement
— Catch-up immunizations including influenza (≥6 months) and COVID-19 per ACIP; revisit RSV prevention status
— Limit exposure to large groups and sick contacts during peak season
— Discuss daycare considerations
Step 3 management: A common Step 3 distractor on discharge is "prescribe albuterol MDI with spacer to use at home." The correct discharge plan for resolving bronchiolitis is supportive care education, nasal saline, return precautions, and a follow-up visit in 24–72 hours — no inhalers, no steroids, no antibiotics.
— Within 24–48 hours for infants discharged from ED or hospital, by phone or in-person.
— Within 24 hours for high-risk infants (ex-preemies, <3 months, comorbidities).
— In-person visit within 1 week to confirm resolution.
— Respiratory status, work of breathing, feeding, hydration, sleep, activity
— Persistent or worsening symptoms beyond expected day 5–7 peak
— Weight check (especially if poor feeding during illness)
— Resolution of fever
— Caregiver coping and burden
— Cough may persist 2–4 weeks after acute illness; this alone does not warrant re-evaluation unless other symptoms.
— Symptoms typically peak day 3–5 and improve thereafter.
— Sleep disruption is common during recovery.
— Recurrent wheeze with future colds in ~30%; reassure and re-evaluate if pattern emerges (asthma evaluation).
— Track growth and development closely after severe bronchiolitis
— Consider pulmonology follow-up if persistent symptoms >4 weeks, persistent O₂ requirement, or atypical course
— Cardiology follow-up if CHD-related concerns surfaced during admission
— Demonstrate nasal saline + bulb suction technique (before feeds and sleep, not excessively)
— Encourage small, frequent feeds during recovery
— Maintain head-of-bed elevation while supervised
— Never expose infants to tobacco smoke or vaping aerosols
— Hand hygiene during sibling illnesses
— Influenza, COVID, routine schedule; ensure nirsevimab if in RSV season and not yet given (deferred during acute illness)
Board pearl: Persistent cough at 2-week follow-up after bronchiolitis in an otherwise improving infant who is feeding well and afebrile is expected and does not require further workup or treatment — reassure parents. New focal findings, fever, weight loss, or progressive symptoms warrant imaging and reassessment for atypical pathogens or alternative diagnoses.
— Discuss the evidence base for "doing less" — many parents expect antibiotics, bronchodilators, or steroids; clinicians must counsel that these are not beneficial and may cause harm.
— Frame supportive care as active, evidence-based management.
— Document parental understanding when declining additional interventions.
— ED → floor: Communicate respiratory trajectory, support modalities, feeding plan, social concerns.
— Floor → home: Ensure caregivers can suction, recognize warning signs (teach-back), have follow-up scheduled, and have transportation.
— Floor → PICU: Anticipatory transfer before crisis; structured handoff (e.g., I-PASS).
— PICU → floor → home: Multi-step transitions are highest risk for missed information; written discharge summary to PCP within 48 hours.
— Avoid hypotonic IVF in hospitalized children to prevent iatrogenic hyponatremia.
— Avoid continuous pulse oximetry in stable, non-hypoxic infants — drives alarm fatigue, prolongs stays, and overuse of O₂ ("oximetry creep"); use intermittent spot checks.
— Avoid antibiotic overuse — drives resistance, C. diff, and side effects.
— Confirm correct patient and dose for any high-alert medication (e.g., epinephrine, opioids if used for intubation).
— Suspected child abuse or neglect must be reported even if encountered incidentally during bronchiolitis admission (e.g., unexplained bruising, caregiver neglect leading to delayed presentation, fabricated illness). Reporting is mandated regardless of parental wishes.
— Tobacco exposure is not reportable but should be addressed; document smoking-cessation counseling.
— Insurance/access barriers may limit nirsevimab uptake — advocate via VFC.
— Avoid unnecessary admissions that increase family financial toxicity; use observation status when appropriate.
— Equity: respiratory illness disproportionately affects AI/AN and lower-income communities; targeted prevention matters.
Step 3 management: When a family asks for "a Z-pack" for a 4-month-old with bronchiolitis, the correct response is explicit shared decision-making: explain antibiotics are ineffective against viruses, can cause harm, and supportive care is the evidence-based standard — document the conversation. Caving to non-evidence-based requests is a recognized safety and stewardship failure.
— Do not give albuterol, racemic epi (routine), steroids, antibiotics, or chest PT.
— O₂ if SpO₂ persistently <90%.
— Hypertonic saline only may be considered for hospitalized patients.
— Use intermittent, not continuous, pulse oximetry once stable.
Key distinction: "Bronchiolitis" in the adult literature refers to small airway diseases (bronchiolitis obliterans, RB-ILD, etc.) — pediatric usage is restricted to acute viral lower respiratory infection of small airways in children <2 years.
— 6-month-old with 3 days of URI, now wheezing, RR 50, SpO₂ 94%, feeding well. CXR shown with hyperinflation. The doc started albuterol nebs and amoxicillin.
— Answer: Discontinue albuterol and antibiotics; provide supportive care, nasal suction, and PO hydration. Discharge with return precautions.
— 4-week-old ex-preemie with viral URI, mild retractions, SpO₂ 91%, took only 40% of feeds in 24h, mom reports two brief apneic episodes.
— Answer: Admit (apnea + poor feeding + age + prematurity); continuous monitoring, IV/NG hydration, oxygen as needed.
— Hospitalized 8-month-old, clinically improving, feeding well, with intermittent SpO₂ dips to 88% during sleep, now on continuous monitoring.
— Answer: Transition to intermittent pulse oximetry; transient sleep desaturations are normal and do not delay discharge.
— 3-month-old hospitalized 2 days, sodium dropped from 138 to 128 on D5½NS.
— Answer: Switch to isotonic fluids (D5NS), reduce rate; SIADH from severe respiratory illness.
— Healthy term infant born October to a mom who received maternal RSV vaccine at 34 weeks.
— Answer: No nirsevimab needed.
— Hospitalized infant on HFNC 2 L/kg/min, rising PCO₂ (60), pH 7.27, worsening retractions.
— Answer: Escalate to CPAP/BiPAP; PICU transfer.
— 6-week-old with "bronchiolitis," feeding poorly with sweating, hepatomegaly, holosystolic murmur, CXR with cardiomegaly.
— Answer: Echocardiogram for suspected VSD/CHF, not airway escalation.
— Infant off O₂ for 12 hours, feeding 80% of baseline, RR 40, parents demonstrate suctioning.
— Answer: Discharge with PCP follow-up in 24–48 hours; no medications needed.
Board pearl: USMLE rewards doing less in bronchiolitis. When unsure between supportive care and a pharmacologic intervention, choose supportive care.
Bronchiolitis is a clinical diagnosis of viral lower airway inflammation in children <2 years for which the cornerstone of management is supportive care — oxygen to keep SpO₂ ≥90%, hydration, nasal suctioning, escalating respiratory support when needed — while specifically avoiding routinely ineffective therapies like albuterol, steroids, antibiotics, and chest physiotherapy, and applying targeted RSV prevention with nirsevimab or maternal vaccination.
— Diagnosis is clinical: No routine CXR, viral testing, or labs. Reserve workup for severe/atypical disease, febrile infants <60 days (check UA), or failure to improve.
— Supportive care wins: Nasal saline + bulb suction, isotonic IVF (avoid hypotonic — SIADH risk), oxygen if SpO₂ persistently <90%, HFNC → CPAP → intubation as escalation. Use intermittent pulse oximetry in stable patients.
— Don't give: Albuterol, racemic epi (routine), corticosteroids, antibiotics (unless documented bacterial co-infection), chest PT. Hypertonic saline only optionally for prolonged inpatient stays.
— Prevention: Nirsevimab for all infants <8 months entering first RSV season (unless mom received RSVpreF vaccine ≥14 days pre-delivery); palivizumab still available for select high-risk patients; smoke avoidance and breastfeeding for everyone.
— Admit for: apnea, hypoxia, dehydration/poor feeding, age <2 months with significant symptoms, high-risk comorbidity, or social concerns.
— Discharge when: stable on room air (or baseline), feeding ≥75% baseline, caregivers educated with reliable follow-up; expect cough up to 2–4 weeks.
Step 3 management: On exam day, default to "stop the unnecessary medication and provide supportive care" for any bronchiolitis stem unless a clear comorbidity or alternative diagnosis (CHD, foreign body, pertussis, CF, sepsis) shifts you elsewhere — and remember that thoughtful transitions of care, family education, and primary care follow-up within 24–72 hours are graded just as heavily as inpatient orders in Step 3's ambulatory and longitudinal frame.