The Daily Differential — Monday, June 8, 2026

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Common Pediatric Respiratory Tract Infections

These are among the most common pediatric ED complaints, and the main job is to identify the few children who are actually sick or at risk for airway...

0:00 AI‑generated audio

At the Bedside

Think syndrome first: URI/common cold, bronchiolitis, croup, viral pharyngitis, influenza, COVID, RSV, pneumonia, sinusitis, otitis media, pertussis, epiglottitis, retropharyngeal/peritonsillar abscess, and foreign body aspiration.
Triage by appearance and work of breathing: toxic appearance, lethargy, stridor at rest, grunting, retractions, apnea, cyanosis, hypoxemia, dehydration, poor feeding, or failure to thrive = higher risk.
Upper airway vs lower airway:
Croup: barky cough, inspiratory stridor, hoarseness, worse at night.
Bronchiolitis: infant with viral prodrome, wheeze/crackles, increased work of breathing, feeding difficulty.
Pneumonia: fever, focal crackles, hypoxemia, tachypnea, chest pain, pleuritic symptoms, or focal findings.
Workup is often minimal if the child is well-appearing with a classic viral syndrome. Use pulse ox, hydration assessment, and targeted testing only when it changes management.
Croup management: dexamethasone for most; nebulized epinephrine for moderate/severe stridor at rest; observe for recurrence after treatment.
Bronchiolitis management: supportive care, nasal suction, oxygen if hypoxic, hydration/PO challenge; bronchodilators and steroids are generally not routine.
Pneumonia: consider CXR if diagnosis uncertain, severe disease, hypoxemia, focal exam, or failure of outpatient therapy. Outpatient amoxicillin is typical for suspected bacterial CAP in appropriate patients; admit if hypoxemic, dehydrated, unable to maintain intake, or with apnea/respiratory distress.
Pharyngitis: evaluate for GAS when age/symptoms fit; use rapid test when indicated. If drooling, muffled voice, tripod, or severe odynophagia, think epiglottitis or deep space infection and secure airway early.
Otitis media: diagnose with bulging TM and middle ear effusion, not just erythema; pain control matters.
Disposition: most uncomplicated viral URIs/croup after treatment, mild bronchiolitis, and stable otitis/pharyngitis go home with return precautions. Admit/transfer if respiratory failure, recurrent apnea, poor feeding/dehydration, toxic appearance, or concern for bacterial deep neck/airway infection.

A Classic Presentation

A 2-year-old vaccinated boy is brought in with fever, runny nose, cough, and mild increased work of breathing for 2 days. He is alert, drinking some fluids, with mild subcostal retractions, wheeze/crackles, and oxygen saturation of 96% on room air. No focal lung findings, no stridor at rest, and no toxic appearance are present. He is diagnosed with viral bronchiolitis, gets nasal suction and supportive care, passes a PO challenge, and is discharged with return precautions.

Patient Presentation to Attending

This is a 2-year-old boy with 2 days of cough, congestion, and fever who looks like uncomplicated viral bronchiolitis, but I’m screening for pneumonia, croup, and other airway disease because of the age and work of breathing. He’s had mild retractions and decreased PO but no apnea, cyanosis, stridor at rest, or focal pleuritic pain, which makes severe lower airway infection or upper-airway obstruction less likely. On exam he’s alert, well perfused, with mild subcostal retractions and diffuse transmitted upper-airway sounds, and his sat is 96% on room air. I don’t see focal crackles or a toxic appearance that would push me toward bacterial pneumonia, and he’s tolerated suction and a PO challenge. Overall I think this is a viral respiratory infection/bronchiolitis picture, so I’m planning supportive care and discharge with close return precautions if he stays well.

Study Directive

Make a one-page “peds airway vs lower airway” differential with the defining features of croup, bronchiolitis, pneumonia, epiglottitis, and deep neck infection.
Memorize the croup treatment ladder: calm child, dexamethasone, nebulized epinephrine, observe, discharge vs admit.
Practice describing pediatric work of breathing using standard language: tachypnea, retractions, nasal flaring, grunting, head bobbing.
Review age-based antibiotic indications for AOM and CAP in children.
Rehearse return precautions for parents: worsening work of breathing, poor intake, apnea, cyanosis, dehydration, persistent fever, lethargy.

Key Medications

Dexamethasone (croup/pharyngitis inflammation): 0.6 mg/kg PO/IM/IV once, max commonly 10–16 mg depending on local protocol; verify institutional practice.
Nebulized epinephrine (croup): racemic epinephrine 2.25% 0.5 mL in 2.5–3 mL NS neb, or L-epinephrine 5 mL of 1:1,000 via neb in many protocols; observe after treatment for rebound.
Amoxicillin (AOM, many CAP cases): 80–90 mg/kg/day PO divided BID.
Amoxicillin-clavulanate: 45 mg/kg/day amoxicillin component PO divided BID; use higher-dose formulation when indicated per local guidance.
Azithromycin: 10 mg/kg day 1, then 5 mg/kg daily days 2–5 when atypical pathogens are suspected; pediatric use depends on syndrome and age.
Ibuprofen: 10 mg/kg PO q6–8h PRN.
Acetaminophen: 15 mg/kg PO q4–6h PRN.
Oxygen, suction, IV/NG fluids as needed.
Note: pediatric antibiotic choices vary by age, immunization status, local resistance, and syndrome; check guidelines for febrile infants and specific pneumonia pathways.

High-Yield Pearls

The child’s appearance matters more than the chest x-ray in most routine pediatric respiratory infections.
Stridor is an upper-airway problem until proven otherwise; wheeze/crackles suggest lower airway disease.
A well-appearing child with normal oxygenation and good hydration often needs supportive care, not broad testing or antibiotics.

Board Question

A 3-year-old child has a barky cough and inspiratory stridor that is worse when upset, but no drooling and no tripod posture. What is the best initial treatment?

ACeftriaxone and admission
BDexamethasone
CEmergent intubation
DAlbuterol nebulizers only

Reveal answer

Correct: B

This is classic mild-to-moderate croup, and dexamethasone is the key initial treatment. Nebulized epinephrine is added for stridor at rest or moderate/severe distress; antibiotics and routine bronchodilators are not indicated.

Recent Literature

Review or guideline Childhood community-acquired pneumonia
Eur J Pediatr, 2024 · cited 99×

Full text · open access
Recent clinical Trends and methods of emergency department visits related to suicide attempts in adolescents: a 16-year retrospective observational study (2010-2025)
Eur J Pediatr, 2026

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Mechanical Ventilation and Non-Invasive Positive Pressure Ventilatory Support

Ventilatory support can be lifesaving, but the wrong settings or poor patient selection can worsen shock, barotrauma, or delayed intubation. ED residents...

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At the Bedside

Assess indication: hypoxemic respiratory failure, hypercapnic respiratory failure, increased work of breathing, airway protection failure, or impending arrest.
NIV best fits: COPD exacerbation with acidosis/hypercapnia, cardiogenic pulmonary edema, selected asthma, obesity hypoventilation, and some immunocompromised patients — if they are awake enough to cooperate, protect airway, and tolerate the mask.
Contraindications to NIV: inability to protect airway, vomiting, severe encephalopathy, facial trauma/burns, high aspiration risk, hemodynamic instability/shock, inability to fit mask, copious secretions, or immediate need for intubation.
Initial NIV settings:
BiPAP: start around IPAP 10–15 cm H2O and EPAP 5 cm H2O; adjust for ventilation and oxygenation.
CPAP: often 5–10 cm H2O for pulmonary edema/OSA-type physiology.
Use supplemental O2 to target appropriate saturation.
Invasive ventilation basics: if intubation is needed, preoxygenate aggressively, use hemodynamically thoughtful induction, and anticipate difficulty in obese, hypoxic, or acidotic patients.
Initial ventilator strategy (general): lung-protective tidal volumes around 6–8 mL/kg predicted body weight; adjust RR, PEEP, FiO2 to oxygenation and ventilation goals.
Disease-specific nuances:
Asthma/COPD: avoid air trapping; allow prolonged expiratory time, monitor auto-PEEP, accept permissive hypercapnia when appropriate.
ARDS/severe hypoxemia: low tidal volume, adequate PEEP, minimize volutrauma.
Cardiogenic pulmonary edema: positive pressure reduces preload/afterload and can rapidly improve work of breathing.
Monitoring: serial vitals, mental status, repeat blood gas when needed, and frequent reassessment within 15–30 minutes after NIV initiation. If the patient worsens or doesn’t improve early, escalate promptly.
Disposition: many NIV patients need ICU or step-down; if a patient requires ongoing positive pressure, is acidotic/hypercapnic, or has significant oxygen needs, admission is expected.
Practical rule: if you’re using NIV as a bridge, know the endpoint. If there’s no improvement in work of breathing, gas exchange, or mental status, don’t persist too long.

A Classic Presentation

A 68-year-old man with COPD presents with worsening dyspnea, somnolence, and accessory muscle use. He is tachypneic, hypertensive, and has diffuse wheeze with prolonged expiratory phase; VBG shows respiratory acidosis with elevated CO2. He is placed on BiPAP, given bronchodilators and steroids, and within 20 minutes his work of breathing improves and his pH begins to normalize. He is admitted for ongoing NIV and monitoring.

Patient Presentation to Attending

This is a 68-year-old man with COPD and hypercapnic respiratory failure who’s presenting with worsening dyspnea and fatigue over the last several hours, and my main concern is impending ventilatory failure because he’s tiring out and retaining CO2. He’s tachypneic with accessory muscle use, diffuse wheezing, and an elevated CO2 with acidosis on VBG, but he’s still awake enough to protect his airway and cooperate with the mask. I’m less worried that he needs immediate intubation right now because he has no vomiting, no severe encephalopathy, and no shock, though I’m watching closely for failure of NIV. We started BiPAP with bronchodilators and steroids, and his work of breathing is already improving. Plan is serial reassessment and likely ICU or step-down admission unless he deteriorates or stops responding.

Study Directive

Memorize the NIV indication/contraindication list and rehearse it out loud.
Practice setting initial BiPAP/CPAP values from memory and explain what IPAP vs EPAP changes.
Review the initial ventilator strategy for COPD vs ARDS vs pulmonary edema.
Draw a quick algorithm: when to try NIV, when to reassess, and when to intubate.
Read one institutional or textbook chapter on peri-intubation hemodynamic optimization.

Key Medications

No “ventilator medication” replaces source control and respiratory support.
Sedation for NIV is nuanced and often risky; if needed, use ICU/airway expertise and institutional protocols.
Common intubation adjuncts if escalation is needed:
- Etomidate: 0.3 mg/kg IV.
- Ketamine: 1–2 mg/kg IV for induction; may be favored in bronchospasm or shock, but dose and effect vary by patient.
- Rocuronium: 1–1.2 mg/kg IV for paralysis.
Bronchodilators/steroids should be given for asthma/COPD-specific indications per standard protocols.

High-Yield Pearls

NIV is a bridge, not a destination; early improvement in work of breathing and gas exchange should be visible.
Positive pressure helps cardiogenic pulmonary edema but can hurt preload-dependent or shocky patients.
For intubation, lung-protective ventilation and thoughtful preoxygenation matter as much as the tube itself.

Board Question

Which of the following is the best candidate for a trial of non-invasive positive pressure ventilation?

AA vomiting, obtunded patient with facial burns
BA cooperative patient with COPD exacerbation and hypercapnic acidosis
CA hypotensive patient with copious secretions and altered mental status
DA patient with severe agitation who cannot tolerate any mask

Reveal answer

Correct: B

COPD exacerbation with hypercapnic acidosis is a classic indication for NIV if the patient can protect the airway and cooperate. The other options are contraindications or poor candidates because of aspiration risk, inability to tolerate the interface, or hemodynamic instability.

Recent Literature

Review or guideline Non-invasive ventilatory support and high-flow nasal oxygen as first-line treatment of acute hypoxemic respiratory failure and ARDS
Intensive Care Med, 2021 · cited 287×

Full text · open access
Recent clinical Sarcopenia in amyotrophic lateral sclerosis: a key predictor of respiratory dysfunction and disease progression
Front Nutr, 2026

Full text · open access

4 of 4

Mechanical and Non-Invasive Positive Pressure Ventilation Complications

Positive pressure can save lives, but it can also cause immediate, lethal complications — especially barotrauma, hemodynamic collapse, aspiration, and...

0:00 AI‑generated audio

At the Bedside

Think of complications in two buckets:

1. Ventilator/NIV-induced physiologic problems 2. Device/interface problems or failure to improve

Common complications of invasive ventilation:
Barotrauma: pneumothorax, pneumomediastinum, subcutaneous emphysema
Hypotension from decreased venous return/increased intrathoracic pressure
Auto-PEEP/dynamic hyperinflation causing shock, especially in asthma/COPD
Ventilator dyssynchrony, breath stacking, inadequate sedation/analgesia
Oxygen toxicity/atelectasis/volutrauma with inappropriate settings
Common complications of NIV:
Aspiration/vomiting
Pressure sores, eye irritation, gastric insufflation
Air leak and poor mask seal
Delayed intubation if the patient is failing but kept on NIV too long
Red flags after starting positive pressure: worsening hypotension, rising CO2, increasing work of breathing, new unilateral breath sounds, sudden hypoxia, agitation, inability to synchronize, mental status decline.
Immediate response:
Check the patient before the machine.
Remove mask/tube if causing immediate instability and support ventilation as needed.
Consider pneumothorax in sudden decompensation; bedside ultrasound and CXR are useful, but unstable patients may need empiric treatment.
If auto-PEEP is suspected in asthma/COPD, disconnect briefly from the ventilator to allow exhalation and reassess; reduce RR, tidal volume, and inspiratory time, and increase expiratory time.
For hypotension after intubation/PPV, assess for dynamic hyperinflation, barotrauma, sedation-related vasodilation, and preload reduction.
Disposition: any patient with a major PPV complication requires immediate reassessment, possible tube repositioning/chest decompression, and ICU-level care.

A Classic Presentation

A 59-year-old man with severe COPD is intubated for hypercapnic respiratory failure. Shortly after ventilation starts, he becomes profoundly hypotensive with rising peak pressures and poor exhalation. Exam shows diminished breath sounds and prolonged expiratory phase; bedside assessment suggests dynamic hyperinflation with auto-PEEP rather than isolated sepsis. The ventilator is temporarily disconnected, the settings are adjusted to allow longer exhalation, he is resuscitated with pressors, and he stabilizes.

Patient Presentation to Attending

This is a 59-year-old man with severe COPD who became hypotensive shortly after intubation, and my main concern is a positive-pressure complication like auto-PEEP or barotrauma rather than simple sedation effect. He’s got high peak pressures, poor chest rise, and prolonged expiration, which makes dynamic hyperinflation very plausible; I’m also watching for pneumothorax because of the abrupt decompensation. On exam he’s tachycardic, hypotensive, and difficult to ventilate, with diminished breath sounds on the right more than the left. We’ve briefly disconnected the circuit to allow exhalation, are checking for tension physiology with bedside ultrasound, and I’m adjusting the ventilator to lower rate and increase expiratory time while supporting blood pressure. If he doesn’t stabilize quickly, we’ll need emergent decompression or tube repositioning and ICU-level care.

Study Directive

Draw a ventilator complication differential for sudden hypotension: tension pneumo, auto-PEEP, tube misplacement, mucus plug, sedation effect.
Practice distinguishing peak vs plateau pressure problems.
Rehearse the immediate bedside response to a crashing ventilated patient: disconnect, oxygenate, assess tube/chest, ultrasound, decompress if needed.
Review ventilator waveform basics if available at your institution.
Make a 1-page “what to change first” list for obstructive vs restrictive ventilation problems.

Mechanism Pearl of the Day: Positive pressure is a double-edged sword: it can recruit alveoli and unload the left heart, but it also increases intrathoracic pressure, which can drop venous return, worsen RV afterload, and precipitate shock in preload-dependent or pulmonary vascular disease states.

Key Medications

Analgesia/sedation for ventilator dyssynchrony depends on the clinical context and is protocol-driven. Common ICU/ED agents include:
- Fentanyl: 25–100 mcg IV boluses; infusion protocols vary.
- Propofol: infusion commonly 5–50 mcg/kg/min; monitor for hypotension.
- Dexmedetomidine: 0.2–1.5 mcg/kg/hr infusion; slower onset, less respiratory depression.
Peri-intubation/RSI agents if tube exchange or reintubation is needed:
- Etomidate: 0.3 mg/kg IV
- Ketamine: 1–2 mg/kg IV
- Rocuronium: 1–1.2 mg/kg IV
For severe bronchospasm/auto-PEEP in asthma: treat with bronchodilators, steroids, magnesium, and ventilator adjustments.
Important: sedative dosing and choice vary widely by patient and protocol; check local guidance if uncertain.

High-Yield Pearls

Always assess the patient first, not just the ventilator numbers.
High peak pressures can mean obstruction, bronchospasm, secretions, or compliance problems; high plateau pressures point more toward stiff lungs/low compliance.
In COPD/asthma, too much rate or too little expiratory time can cause auto-PEEP and obstructive shock.

Board Question

A mechanically ventilated patient suddenly becomes hypotensive with rising peak airway pressures and unilateral absent breath sounds. What is the most appropriate immediate next step?

AIncrease tidal volume
BCheck for pneumothorax and treat immediately if suspected
CAdminister furosemide
DIncrease the respiratory rate

Reveal answer

Correct: B

Sudden hypotension with high airway pressures and unilateral absent breath sounds is concerning for tension pneumothorax or other barotrauma. In an unstable patient, treatment should not be delayed for imaging if clinical suspicion is high.

Recent Literature

Review or guideline How to ventilate obstructive and asthmatic patients
Intensive Care Med, 2020 · cited 70×

Full text · open access
Recent clinical Admission Criteria to Paediatric Intensive Care for Oncology Haematology Patients: Updates and Evidence-Based Clinical Recommendations
Pediatr Rep, 2026

Full text · open access

TheDaily Differential

Pulmonary Hypertension

At the Bedside

Study Directive

Recent Literature

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