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Severe ARDS Case: Proning, Paralysis, Transport, and VV-ECMO [ Case Discussion ](https://mdster.com/blog?category=case-discussion) Severe ARDS Case: Proning, Paralysis, Transport, and VV-ECMO ============================================================== Physiologic reasoning and board-relevant decisions in refractory hypoxemia, transport deterioration, and rescue support [ MDster Editorial Team ](https://mdster.com/about) · Sep 02, 2026 · 5 min read · 155 [ 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) [ Anesthesiology ](https://mdster.com/blog?tag=anesthesiology) [ ARDS ](https://mdster.com/blog?tag=ards) [ Mechanical Ventilation ](https://mdster.com/blog?tag=mechanical-ventilation) [ Prone Positioning ](https://mdster.com/blog?tag=prone-positioning) [ Critical Care Transport ](https://mdster.com/blog?tag=critical-care-transport) [ VV-ECMO ](https://mdster.com/blog?tag=vv-ecmo) ![Severe ARDS Case: Proning, Paralysis, Transport, and VV-ECMO](https://mdster.com/storage/blog/images/severe-ards-case-proning-paralysis-transport-and-vv-ecmo.jpg) Share this article Share this post On this page 1. [ Recognizing Severe ARDS ](#recognizing-severe-ards) 2. [ Lung-Protective Ventilation Before Rescue Therapy ](#lung-protective-ventilation-before-rescue-therapy) 3. [ Why Proning Works ](#why-proning-works) 4. [ Neuromuscular Blockade: Selective, Not Automatic ](#neuromuscular-blockade-selective-not-automatic) 5. [ Urgent CT Transport With Suspected Hemorrhage ](#urgent-ct-transport-with-suspected-hemorrhage) 6. [ High Pressure and Sudden Desaturation ](#high-pressure-and-sudden-desaturation) 7. [ Escalation to iNO and VV-ECMO ](#escalation-to-ino-and-vv-ecmo) 8. [ Key Points for Board Exams ](#key-points-for-board-exams) 9. [ Conclusion ](#conclusion) 10. [ Frequently Asked Questions ](#blog-faqs) 11. [ References ](#references-heading) On this page 1. [ Recognizing Severe ARDS ](#recognizing-severe-ards) 2. [ Lung-Protective Ventilation Before Rescue Therapy ](#lung-protective-ventilation-before-rescue-therapy) 3. [ Why Proning Works ](#why-proning-works) 4. [ Neuromuscular Blockade: Selective, Not Automatic ](#neuromuscular-blockade-selective-not-automatic) 5. [ Urgent CT Transport With Suspected Hemorrhage ](#urgent-ct-transport-with-suspected-hemorrhage) 6. [ High Pressure and Sudden Desaturation ](#high-pressure-and-sudden-desaturation) 7. [ Escalation to iNO and VV-ECMO ](#escalation-to-ino-and-vv-ecmo) 8. [ Key Points for Board Exams ](#key-points-for-board-exams) 9. [ Conclusion ](#conclusion) 10. [ Frequently Asked Questions ](#blog-faqs) 11. [ References ](#references-heading) A 55-year-old man with severe community-acquired pneumonia remains profoundly hypoxemic despite an FiO2 of 1.0 and PEEP of 14 cmH2O. His immediate threats are refractory shunt, ventilator-induced lung injury, hemodynamic deterioration, and the hazards of transporting an unstable patient with suspected hemorrhage. Recognizing Severe ARDS ----------------------- The PaO2/FiO2 ratio is 65 mmHg, measured with PEEP well above 5 cmH2O. Under the Berlin Definition, this is **severe ARDS**. Although oral examinations sometimes ask for “three criteria,” the definition contains four domains: - Onset within one week of pneumonia or worsening respiratory symptoms - Bilateral opacities not explained by effusions, collapse, or nodules - Respiratory failure not fully explained by cardiac failure or fluid overload - PaO2/FiO2 ≤100 mmHg with PEEP of at least 5 cmH2O Normal LV function supports noncardiogenic pulmonary edema but does not independently exclude fluid overload or RV dysfunction. Competing diagnoses include cardiogenic edema, diffuse alveolar hemorrhage, extensive atelectasis, mucus plugging, pneumothorax, and pulmonary embolism. [\[1\]](#cite-1 "Reference [1]") Lung-Protective Ventilation Before Rescue Therapy ------------------------------------------------- His tidal volume is 420 mL, exactly 6 mL/kg predicted body weight. The next data required are plateau pressure, total PEEP, driving pressure, flow waveform, and evidence of auto-PEEP. Current guidelines support tidal volumes of 4–8 mL/kg PBW with plateau pressure below 30 cmH2O; PBW, not actual weight, determines tidal volume. [\[2\]](#cite-2 "Reference [2]") A pH of 7.28 may be accepted during protective ventilation if there is no major contraindication to permissive hypercapnia. Higher PEEP may benefit moderate-to-severe ARDS, but it should be individualized against compliance, blood pressure, and RV performance. Prolonged aggressive recruitment maneuvers should be avoided. [\[3\]](#cite-3 "Reference [3]") ### Why Proning Works Proning should begin early and continue for prolonged sessions, commonly at least 16 hours, when severe hypoxemia persists. It improves gas exchange and limits regional stress through: - Recruitment of dorsal lung while preserving its preferential perfusion - More homogeneous pleural and transpulmonary pressure gradients - Reduced cardiac and abdominal compression of dependent lung - More uniform tidal ventilation, reducing regional overdistention The objective is not merely a higher PaO2. Proning distributes strain across a larger functional lung and has demonstrated a survival benefit in appropriately selected severe ARDS. [\[4\]](#cite-4 "Reference [4]") ### Neuromuscular Blockade: Selective, Not Automatic Cisatracurium may be justified when deep sedation alone cannot prevent dyssynchrony, excessive inspiratory effort, or unsafe ventilation during proning. Adequate analgesia and amnesia must precede paralysis. The evidence remains nuanced. ATS guidance conditionally supports neuromuscular blockade in early severe ARDS, whereas ESICM recommends against routine continuous infusion solely to reduce mortality. ROSE found no mortality benefit from routine early cisatracurium compared with a lighter-sedation strategy using high PEEP. [\[3\]](#cite-3 "Reference [3]") > **Clinical Pearl:** Paralysis is a tool for delivering protective ventilation—not a substitute for correcting poor ventilator settings, pain, acidosis, or airway obstruction. Urgent CT Transport With Suspected Hemorrhage --------------------------------------------- A falling hemoglobin and abdominal distention require immediate reassessment, coagulation studies, fibrinogen, type and crossmatch, and review of anticoagulant exposure. CT is justified only if imaging will alter urgent management and bedside alternatives are inadequate. Before departure, verify: - ETT depth, fixation, cuff integrity, suction patency, and emergency airway equipment - Transport ventilator function with ICU-equivalent tidal volume, PEEP, rate, and alarms - Oxygen supply exceeding the calculated journey requirement, plus a bag with PEEP valve - Continuous ECG, SpO2, blood pressure, and ETCO2 monitoring - Battery life, secure vascular access, norepinephrine reserve, and backup infusions - Skilled personnel capable of airway intervention and advanced resuscitation Formal transport planning should address communication, equipment, monitoring, staffing, and documentation. [\[5\]](#cite-5 "Reference [5]") ### High Pressure and Sudden Desaturation Disconnecting the ventilator distinguishes equipment failure from patient or airway pathology. Persistently poor manual compliance prioritizes: 1. ETT obstruction or kinking—attempt to pass a suction catheter. 2. Tension pneumothorax—look for unilateral findings and worsening shock; decompress immediately if strongly suspected. 3. Severe bronchospasm. 4. Mainstem migration, acute derecruitment, pulmonary edema, or raised intra-abdominal pressure. Do not transport onward while troubleshooting. Return to the nearest fully supported clinical area unless an immediate intervention is available at the destination. Escalation to iNO and VV-ECMO ----------------------------- Inhaled nitric oxide selectively dilates vessels adjacent to ventilated alveoli, redirecting pulmonary blood flow and improving V/Q matching. Any oxygenation response is usually temporary; evidence does not demonstrate a survival benefit, so iNO is best regarded as a bridge rather than definitive ARDS therapy. [\[6\]](#cite-6 "Reference [6]") VV-ECMO consultation should occur early for potentially reversible ARDS despite protective ventilation and proning. ELSO advises consideration with PaO2/FiO2 below 80 mmHg or severe hypercapnic acidosis despite optimized conventional ventilation. EOLIA thresholds—PaO2/FiO2 below 50 for over three hours, below 80 for over six hours, or pH below 7.25 with PaCO2 at least 60 mmHg for over six hours—are useful referral triggers, not universal mandates. Active retroperitoneal bleeding materially complicates cannulation and anticoagulation decisions. [\[7\]](#cite-7 "Reference [7]") Key Points for Board Exams -------------------------- - This patient meets Berlin criteria for severe ARDS. - Low tidal volume and limited plateau pressure remain foundational. - Early prolonged proning improves survival in severe ARDS. - Use continuous NMB selectively for otherwise unachievable protective ventilation. - Poor compliance during manual ventilation suggests airway obstruction, pneumothorax, or severe bronchospasm. - Contact an ECMO center before conventional options are exhausted. Conclusion ---------- Successful management depends on sequencing: confirm the diagnosis, minimize mechanical injury, prone early, use paralysis selectively, transport with ICU-level safeguards, and escalate before rescue options become futile. Frequently Asked Questions ---------------------------- ### Should every patient with severe ARDS receive continuous neuromuscular blockade? No. Consider it when deep sedation cannot achieve safe protective ventilation, control injurious effort, or facilitate proning; routine infusion solely for mortality reduction is not supported. ### Does improved oxygenation after proning prove that lung recruitment occurred? Not necessarily. Improved V/Q matching and altered perfusion may raise PaO2 without major recruitment. Continue proning based on ARDS severity and tolerance, not oxygenation response alone. ### What should be checked first when transport ventilation suddenly becomes difficult? Disconnect the ventilator and manually ventilate. If compliance remains poor, assess ETT patency immediately while evaluating for tension pneumothorax and bronchospasm. ### Is inhaled nitric oxide an alternative to VV-ECMO? No. It may transiently improve oxygenation and serve as a bridge, but it has not demonstrated a survival benefit in ARDS. References (10) ------------------- 1. 1. [ ARDS Definition Task Force. Acute Respiratory Distress Syndrome: The Berlin Definition. JAMA. 2012. ](https://pubmed.ncbi.nlm.nih.gov/22797452/) [↩](#cite-ref-1-1 "Back to text") 2. 2. [ ATS/ESICM/SCCM Clinical Practice Guideline: Mechanical Ventilation in Adult ARDS. 2017. ](https://www.thoracic.org/statements/resources/cc/ards-guidelines.pdf) [↩](#cite-ref-2-1 "Back to text") 3. 3. [ www.atsjournals.org/doi/pdf/10.1164/rccm.202311-2011ST?download=true ](https://www.atsjournals.org/doi/pdf/10.1164/rccm.202311-2011ST?download=true) [↩](#cite-ref-3-1 "Back to text") 4. 4. [ Guérin C, et al. Prone Positioning in Severe ARDS. NEJM. 2013. ](https://pubmed.ncbi.nlm.nih.gov/23688302/) [↩](#cite-ref-4-1 "Back to text") 5. 5. [ pubmed.ncbi.nlm.nih.gov/14707589 ](https://pubmed.ncbi.nlm.nih.gov/14707589/) [↩](#cite-ref-5-1 "Back to text") 6. 6. [ pubmed.ncbi.nlm.nih.gov/41484686 ](https://pubmed.ncbi.nlm.nih.gov/41484686/) [↩](#cite-ref-6-1 "Back to text") 7. 7. [ pmc.ncbi.nlm.nih.gov/articles/8315725 ](https://pmc.ncbi.nlm.nih.gov/articles/8315725/) [↩](#cite-ref-7-1 "Back to text") 8. 8. [ Qadir N, et al. An Update on Management of Adult Patients With ARDS. ATS Guideline. 2024. ](https://pmc.ncbi.nlm.nih.gov/articles/PMC10870893/) 9. 9. [ Grasselli G, et al. ESICM Guidelines on ARDS. 2023. ](https://pmc.ncbi.nlm.nih.gov/articles/PMC10354163/) 10. 10. [ Tonna JE, et al. 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