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[ Home ](https://mdster.com) 2. [ Blog ](https://mdster.com/blog) 3. [ Medical Education ](https://mdster.com/blog?category=medical-education) 4. Pediatric Airway Failure and RSI Nuances Every EM Clinician Must Know [ Medical Education ](https://mdster.com/blog?category=medical-education) Pediatric Airway Failure and RSI Nuances Every EM Clinician Must Know ======================================================================= A high-yield Emergency Medicine guide to preoxygenation, tube sizing, and post-intubation ventilation in neonates and children. [ MDster Editorial Team ](https://mdster.com/about) · Apr 30, 2026 · 6 min read · 56 [ Reviewed by Dr. Ali Ragab, MBBCH, MSc, MCAI ](https://mdster.com/medical-reviewers/dr-ali-ragab) [Editorial Policy](https://mdster.com/editorial-policy) | [Corrections Policy](https://mdster.com/corrections) [ Emergency Medicine ](https://mdster.com/blog?tag=emergency-medicine) [ Mechanical Ventilation ](https://mdster.com/blog?tag=mechanical-ventilation) [ Pediatric Airway ](https://mdster.com/blog?tag=pediatric-airway) [ Rapid Sequence Intubation ](https://mdster.com/blog?tag=rapid-sequence-intubation) [ Neonatal Critical Care ](https://mdster.com/blog?tag=neonatal-critical-care) ![Pediatric Airway Failure and RSI Nuances Every EM Clinician Must Know](https://mdster.com/storage/blog/images/pediatric-airway-failure-and-rsi-nuances-every-em-clinician-must-know.jpg) Share this article Share this post A sick infant does not give you adult-style margin. The child with bronchiolitis, sepsis, status asthmaticus, or head injury can look “okay” right until the saturation falls off a cliff. That is the core pediatric RSI lesson: **the danger is rarely the laryngoscopy alone; it is the speed of desaturation before and during the attempt, and the damage done after the tube goes in if ventilation is sloppy.** Children have less oxygen reserve and higher oxygen consumption, so apnea tolerance is short, especially in neonates and infants. [\[1\]](#cite-1 "Reference [1]") Apnea tolerance and preoxygenation: buy time before you spend it ---------------------------------------------------------------- Preoxygenation in children is not a ceremonial 3-minute pause. It is an attempt to maximize alveolar oxygen stores, recruit lung units, and create enough reserve for a first-pass success attempt. The physiologic benefit of apneic oxygenation depends on **good preoxygenation, airway patency, and enough functional residual capacity**; all three are worse in small children and in anyone with shunt physiology, secretions, or fatigue. [\[1\]](#cite-1 "Reference [1]") That is why the modern pediatric nuance is simple: **oxygenation beats dogma**. If the child will not tolerate a nonrebreather, use two-person BVM with PEEP, jaw thrust, and a tight mask seal. Keep nasal cannula on during laryngoscopy if you can. Current evidence suggests apneic oxygenation is reasonable and may reduce hypoxemia, but high-flow nasal oxygen has not clearly outperformed low-flow oxygen across pediatric settings. In other words, do something reliable, not something fashionable. Standardized pediatric RSI pathways that focus on oxygenation and role clarity improve process safety. [\[2\]](#cite-2 "Reference [2]") A useful inference from the pediatric desaturation literature is this: in the crashing infant, **prolonged unventilated apnea is often the bigger immediate threat than gentle assisted ventilation**. If saturations are drifting, do not stand there admiring your RSI purity. Re-oxygenate, reposition, suction, and take the next attempt under better conditions. Multiple attempts are strongly associated with desaturation and complications; in one multicenter study, desaturation rose from 16% with one attempt to 36% with two and 56% with three or more attempts. [\[3\]](#cite-3 "Reference [3]") > **Clinical Pearl:** In pediatric RSI, the room usually predicts success before the laryngoscope does. If suction, PEEP, backup tube, rescue airway, and a clear re-oxygenation plan are not ready before paralysis, you are already behind. Sizing and equipment readiness: make the room boring ---------------------------------------------------- The sick child airway should feel overprepared. Updated pediatric readiness policy statements continue to emphasize immediately accessible, clearly labeled, kilogram-based equipment and routine verification that equipment is present and functional. That matters because higher ED pediatric readiness is associated with lower mortality, and respiratory equipment is one of the readiness components most linked to survival. [\[4\]](#cite-4 "Reference [4]") Board answer and bedside truth: **the first attempt is the best attempt**. The PeDI registry showed that more than two attempts, especially persistence with direct laryngoscopy, increase severe complications, including cardiac arrest; switching early to an indirect technique improves safety. So size the child, but just as importantly, size your backup plan. [\[5\]](#cite-5 "Reference [5]") A practical starting table: PatientETT starting pointNeonate <1000 g2.5 mm IDNeonate 1000-2000 g3.0 mm IDNeonate >2000 g3.5 mm IDOlder infant/childUse an age-based estimate as a starting point, then have one tube 0.5 mm smaller and one 0.5 mm larger opened These neonatal sizes reflect NRP-based recommendations. For older children, age-based formulas are only a starting estimate; tube brand, airway pathology, and patient habitus matter. Cuffed tubes are now widely accepted in children because they reduce tube exchanges and improve monitoring of exhaled volumes and end-tidal gases when cuff pressure is kept safe. [\[6\]](#cite-6 "Reference [6]") Before drugs, have this visible: primary laryngoscope, backup blade/device, suction turned on, stylet loaded, ETCO2 connected, BVM with PEEP, oral airway, rescue supraglottic airway, and post-intubation sedation ready. Do not intubate a child into an unsedated, unventilated void. Postintubation sedation is a real quality issue in pediatric ED care, not an afterthought. [\[7\]](#cite-7 "Reference [7]") Post-intubation ventilation targets: don’t win the tube and lose the patient ---------------------------------------------------------------------------- The common post-RSI error is adult-default ventilation. For the critically ill child, start with **continuous capnography**, age-appropriate rate selection, and lung-protective thinking. In PARDS, PALICC-2 suggests tidal volumes of **6-8 mL/kg**, with **4-6 mL/kg** if needed to stay within pressure limits, plateau pressure **≤28 cm H2O** in most patients, and driving pressure around **≤15 cm H2O**. Permissive hypercapnia can be acceptable to a lower **pH of 7.20** when used to stay within lung-protective limits. [\[8\]](#cite-8 "Reference [8]") In the ED, that translates to a mental model: **target gas exchange, not just a pretty waveform**. Watch chest excursion, ETCO2 trend, pressure alarms, and oxygen requirement. Then get an early blood gas if the physiology is ugly or the ETCO2 does not fit the child. If this is suspected severe TBI, avoid reflex hyperventilation; routine prophylactic hyperventilation is not recommended because hypocapnia can worsen cerebral ischemia. [\[8\]](#cite-8 "Reference [8]") Clinical correlations --------------------- Bronchiolitis, asthma, pneumonia, sepsis, and TBI all fail for different reasons, but the airway strategy starts the same: maximize reserve, minimize attempts, and ventilate with intent. The exam pitfall is thinking pediatric RSI ends when the tube passes the cords. It does not. The real resuscitation continues with confirmation, sedation, pressure-aware ventilation, and frequent reassessment. Children are unforgiving of both hypoxemia and overventilation. [\[5\]](#cite-5 "Reference [5]") Key Takeaways ------------- - **Children desaturate fast**; preoxygenation is about reserve, not ritual. [\[1\]](#cite-1 "Reference [1]") - Use **apneic oxygenation when feasible**, but do not confuse high-flow novelty with proven superiority. [\[2\]](#cite-2 "Reference [2]") - **Limit attempts early**; repeated laryngoscopy is where complications multiply. [\[3\]](#cite-3 "Reference [3]") - Have **one tube size up and down** plus a rescue device opened before drugs. [\[9\]](#cite-9 "Reference [9]") - After intubation, use **capnography, sedation, and lung-protective ventilation**, not adult-default settings. [\[8\]](#cite-8 "Reference [8]") - In suspected **pediatric TBI**, avoid routine hyperventilation unless you are treating impending herniation as a temporizing maneuver. [\[10\]](#cite-10 "Reference [10]") Conclusion ---------- Pediatric airway failure punishes improvisation. Prepare obsessively, oxygenate aggressively, intubate efficiently, and ventilate thoughtfully. If you remember one line, make it this: **in children, the successful RSI is the one that preserves oxygen reserve before the tube and protects the lungs and brain after it.** Frequently Asked Questions ---------------------------- ### Should every pediatric RSI include apneic oxygenation? Use it whenever it does not delay the attempt or interfere with mask seal. Current pediatric evidence supports apneic oxygenation as reasonable, but high-flow oxygen has not clearly proven superiority over low-flow oxygen across settings. [\[2\]](#cite-2 "Reference [2]") ### What tube size should I choose for a neonate? A practical NRP-based starting point is 2.5 mm ID for infants <1000 g, 3.0 mm for 1000-2000 g, and 3.5 mm for >2000 g, then confirm fit and position clinically. [\[6\]](#cite-6 "Reference [6]") ### Are cuffed tubes acceptable in children? Yes. Modern evidence supports cuffed tubes in children because they reduce tube exchanges and improve ventilatory monitoring, provided cuff pressure is kept in a safe range. [\[9\]](#cite-9 "Reference [9]") ### What are sensible post-intubation ventilator targets in pediatric respiratory failure? Think lung protection: use continuous ETCO2 monitoring, start around 6-8 mL/kg tidal volume, drop toward 4-6 mL/kg if needed to keep plateau pressure and driving pressure within safe limits, and accept permissive hypercapnia only when that is the strategy. [\[8\]](#cite-8 "Reference [8]") ### What is the biggest airway mistake after the tube is placed? Leaving the child on adult-default ventilation and delaying sedation. Post-intubation sedation should be planned before RSI, and ventilation should be titrated with capnography and the child’s physiology. [\[11\]](#cite-11 "Reference [11]") References (17) ------------------- 1. 1. [ pubmed.ncbi.nlm.nih.gov/?term=28099321 ](https://pubmed.ncbi.nlm.nih.gov/?term=28099321) [↩](#cite-ref-1-1 "Back to text") 2. 2. [ pubmed.ncbi.nlm.nih.gov/36479287 ](https://pubmed.ncbi.nlm.nih.gov/36479287/) [↩](#cite-ref-2-1 "Back to text") 3. 3. [ pubmed.ncbi.nlm.nih.gov/27130327 ](https://pubmed.ncbi.nlm.nih.gov/27130327/) [↩](#cite-ref-3-1 "Back to text") 4. 4. [ pubmed.ncbi.nlm.nih.gov/41556937 ](https://pubmed.ncbi.nlm.nih.gov/41556937/) [↩](#cite-ref-4-1 "Back to text") 5. 5. [ pubmed.ncbi.nlm.nih.gov/26705976 ](https://pubmed.ncbi.nlm.nih.gov/26705976/) [↩](#cite-ref-5-1 "Back to text") 6. 6. [ publications.aap.org/pediatrics/article/153/4/e2023062925/196867/Endotracheal-Tube-Size-Adjustments-Within-Seven ](https://publications.aap.org/pediatrics/article/153/4/e2023062925/196867/Endotracheal-Tube-Size-Adjustments-Within-Seven) [↩](#cite-ref-6-1 "Back to text") 7. 7. [ pmc.ncbi.nlm.nih.gov/articles/PMC7523837 ](https://pmc.ncbi.nlm.nih.gov/articles/PMC7523837/) [↩](#cite-ref-7-1 "Back to text") 8. 8. [ achpccg.com/wp-content/uploads/2023/10/Emeriaud\_2023\_Executive-Summary-of-the-Second-International-Guidelines-for-the-Diagnosis-and-Management-of-Pediatric-Acute-Respiratory-Distress-Sydnrome-PALICC-2.pdf ](https://achpccg.com/wp-content/uploads/2023/10/Emeriaud_2023_Executive-Summary-of-the-Second-International-Guidelines-for-the-Diagnosis-and-Management-of-Pediatric-Acute-Respiratory-Distress-Sydnrome-PALICC-2.pdf) [↩](#cite-ref-8-1 "Back to text") 9. 9. [ pubmed.ncbi.nlm.nih.gov/36317427 ](https://pubmed.ncbi.nlm.nih.gov/36317427/) [↩](#cite-ref-9-1 "Back to text") 10. 10. [ pubmed.ncbi.nlm.nih.gov/30822776 ](https://pubmed.ncbi.nlm.nih.gov/30822776/) [↩](#cite-ref-10-1 "Back to text") 11. 11. [ pubmed.ncbi.nlm.nih.gov/39773921 ](https://pubmed.ncbi.nlm.nih.gov/39773921/) [↩](#cite-ref-11-1 "Back to text") 12. 12. Pediatric Readiness in the Emergency Department: Policy Statement. Pediatrics. 2026. 13. 13. Airway management complications in children with difficult tracheal intubation from the Pediatric Difficult Intubation (PeDI) registry: a prospective cohort analysis. Lancet Respir Med. 2016. 14. 14. The number of tracheal intubation attempts matters! A prospective multi-institutional pediatric observational study. BMC Pediatr. 2016. 15. 15. Apnoeic oxygenation during paediatric intubation: A systematic review. Front Pediatr. 2022. 16. 16. Executive Summary of the Second International Guidelines for the Diagnosis and Management of Pediatric Acute Respiratory Distress Syndrome (PALICC-2). Pediatr Crit Care Med. 2023. 17. 17. Executive Summary: International Clinical Practice Guidelines for Pediatric Ventilator Liberation, A PALISI Network Document. Am J Respir Crit Care Med. 2023. 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