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ARDS Adjuncts: Proning, Paralysis, and Inhaled Vasodilators [ Medical Education ](https://mdster.com/blog?category=medical-education) ARDS Adjuncts: Proning, Paralysis, and Inhaled Vasodilators ============================================================= A board-focused way to think about rescue therapies in refractory hypoxemia [ MDster Editorial Team ](https://mdster.com/about) · Jul 12, 2026 · 4 min read · 34 [ 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) [ Critical Care ](https://mdster.com/blog?tag=critical-care) [ ARDS ](https://mdster.com/blog?tag=ards) [ Mechanical Ventilation ](https://mdster.com/blog?tag=mechanical-ventilation) [ Neuromuscular Blockade ](https://mdster.com/blog?tag=neuromuscular-blockade) [ Prone Positioning ](https://mdster.com/blog?tag=prone-positioning) ![ARDS Adjuncts: Proning, Paralysis, and Inhaled Vasodilators](https://mdster.com/storage/blog/images/ards-adjuncts-proning-paralysis-and-inhaled-vasodilators.jpg) Share this article Share this post On this page 1. [ Start with the physiology you are trying to fix ](#start-with-the-physiology-you-are-trying-to-fix) 2. [ Inhaled vasodilators: physiology, not magic ](#inhaled-vasodilators-physiology-not-magic) 3. [ Neuromuscular blockade: use it to control injurious mechanics ](#neuromuscular-blockade-use-it-to-control-injurious-mechanics) 4. [ Prone positioning: the adjunct that changes outcomes ](#prone-positioning-the-adjunct-that-changes-outcomes) 5. [ Clinical relevance for anesthesiology ](#clinical-relevance-for-anesthesiology) 6. [ Key Takeaways ](#key-takeaways) 7. [ Conclusion ](#conclusion) 8. [ Frequently Asked Questions ](#blog-faqs) 9. [ References ](#references-heading) On this page 1. [ Start with the physiology you are trying to fix ](#start-with-the-physiology-you-are-trying-to-fix) 2. [ Inhaled vasodilators: physiology, not magic ](#inhaled-vasodilators-physiology-not-magic) 3. [ Neuromuscular blockade: use it to control injurious mechanics ](#neuromuscular-blockade-use-it-to-control-injurious-mechanics) 4. [ Prone positioning: the adjunct that changes outcomes ](#prone-positioning-the-adjunct-that-changes-outcomes) 5. [ Clinical relevance for anesthesiology ](#clinical-relevance-for-anesthesiology) 6. [ Key Takeaways ](#key-takeaways) 7. [ Conclusion ](#conclusion) 8. [ Frequently Asked Questions ](#blog-faqs) 9. [ References ](#references-heading) When the ARDS patient is on FiO2 1.0, PEEP 14, and still satting 84%, the dangerous move is to treat every adjunct as interchangeable. Don’t. In severe ARDS, prone positioning has the clearest mortality signal, neuromuscular blockade can help you deliver lung-protective ventilation, and inhaled vasodilators usually function as rescue bridges rather than outcome-changing therapy. [\[1\]](#cite-1 "Reference [1]") That distinction matters to anesthesiologists because we are often called when dyssynchrony worsens, RV strain appears, or a patient needs urgent proning with a tenuous airway. It also matters on boards: a better saturation is not the same thing as a therapy that improves survival. [\[2\]](#cite-2 "Reference [2]") Start with the physiology you are trying to fix ----------------------------------------------- Before escalating, ask what problem is killing the patient right now. Adjuncts in ARDS target three different physiologic failures: collapsed dependent lung with shunt, injurious spontaneous effort with dyssynchrony, or pulmonary vascular dysfunction with severe V/Q mismatch and RV strain. If you cannot name the target, you probably should not start the therapy. [\[3\]](#cite-3 "Reference [3]") - Reach for **prone positioning** when you need better lung homogeneity, less shunt, and lower RV strain. [\[3\]](#cite-3 "Reference [3]") - Reach for **neuromuscular blockade** when unsafe respiratory effort or dyssynchrony is preventing lung-protective ventilation. [\[3\]](#cite-3 "Reference [3]") - Reach for **inhaled vasodilators** when you need a selective pulmonary rescue bridge, especially if RV afterload is part of the problem. [\[2\]](#cite-2 "Reference [2]") Inhaled vasodilators: physiology, not magic ------------------------------------------- Inhaled nitric oxide and inhaled prostacyclin preferentially reach ventilated alveoli, so they dilate vessels in better-aerated lung units. The result is improved V/Q matching, lower pulmonary vascular resistance, and sometimes RV unloading, with much less systemic hypotension than IV vasodilators. [\[4\]](#cite-4 "Reference [4]") That physiology is useful, but the exam pearl is brutal: better oxygenation does not translate into better survival. Recent systematic reviews show that iNO may modestly improve PaO2/FiO2 yet shows no clear mortality benefit in adult ARDS; prior reviews also found increased renal dysfunction with iNO. Inhaled prostacyclins can improve oxygenation and pulmonary artery pressures, but outcome data remain limited. [\[5\]](#cite-5 "Reference [5]") - Use a **time-limited rescue trial** when catastrophic hypoxemia or RV dysfunction persists while you organize proning, hemodynamic optimization, or ECMO evaluation. [\[6\]](#cite-6 "Reference [6]") - Don’t mistake a prettier ABG for definitive therapy. If the patient meets proning criteria, prone them. [\[3\]](#cite-3 "Reference [3]") > **Clinical Pearl:** Inhaled vasodilators often improve the monitor faster than the disease. Treat them as bridges, not destinations. [\[5\]](#cite-5 "Reference [5]") Neuromuscular blockade: use it to control injurious mechanics ------------------------------------------------------------- The conceptual role of neuromuscular blockade in ARDS is not “fix hypoxemia.” It is to abolish dyssynchrony, reduce work of breathing, and prevent large spontaneous inspiratory efforts that can drive high transpulmonary pressures and worsen ventilator-induced lung injury. That benefit comes at a price: deep sedation, immobility, and possible ICU-acquired weakness. [\[3\]](#cite-3 "Reference [3]") Current guidance is selective, not routine. The 2024 ATS guideline suggests NMBA use in **early severe ARDS**, and frames the likely sweet spot as severe disease early in the course, especially when dyssynchrony or failure to meet ventilator targets persists despite sedation; treatment duration in trials was generally limited to 48 hours. The 2026 SCCM guideline similarly suggests NMBAs for ARDS with PaO2/FiO2 <150 when patients remain hypoxemic or cannot achieve ventilation targets on sedation. [\[1\]](#cite-1 "Reference [1]") Historically, ACURASYS suggested benefit, but ROSE did not show benefit when the comparator used lighter sedation. That is why the modern answer is not “paralyze every moderate ARDS patient,” but “paralyze the patient whose respiratory drive is making lung-protective ventilation impossible.” Also remember a 2026 board-style pitfall: being prone is **not** by itself an automatic indication for paralysis. [\[3\]](#cite-3 "Reference [3]") - Never start paralysis without a clear analgesia-sedation plan. [\[7\]](#cite-7 "Reference [7]") - Reassess early; if mechanics stabilize, do not let paralysis drift beyond the short-course strategy studied in trials. [\[1\]](#cite-1 "Reference [1]") Prone positioning: the adjunct that changes outcomes ---------------------------------------------------- If you remember one adjunct for boards, make it prone positioning. ATS continues to recommend proning for more than 12 hours per day in severe ARDS, and ESICM recommends proning patients with moderate-severe ARDS when PaO2/FiO2 remains <150 mmHg despite optimized settings, typically using prolonged sessions of 16 hours or more. The PROSEVA enrollment phenotype is the high-yield mental model: intubated early ARDS, PaO2/FiO2 <150, FiO2 at least 0.6, PEEP at least 5, and low-tidal-volume ventilation already in place. [\[1\]](#cite-1 "Reference [1]") Why does proning work? It improves V/Q matching, increases end-expiratory lung volume, homogenizes lung stress and strain, and can unload the right ventricle. Just as important, ESICM emphasizes that you should not abandon proning simply because the first post-turn blood gas is underwhelming; the protective effect may persist even without a dramatic oxygenation jump. [\[8\]](#cite-8 "Reference [8]") Common failures are operational, not intellectual: delayed initiation, poor airway and line planning, pressure injury prevention that is an afterthought, and inadequate staffing. Earlier trials and guidelines also remind us that prone positioning increases endotracheal tube obstruction and pressure sore risk, so execution matters as much as indication. [\[9\]](#cite-9 "Reference [9]") Clinical relevance for anesthesiology ------------------------------------- This is where anesthesiology training adds value. Secure the tube before proning, anticipate hemodynamic shifts, use echo or other bedside assessment when RV strain is suspected, and choose paralysis only when it helps you achieve safe mechanics rather than simply silencing the patient. In other words, match the adjunct to the physiology you see at the bedside. [\[2\]](#cite-2 "Reference [2]") Key Takeaways ------------- - **Prone positioning** is the adjunct with the strongest mortality signal; think early when PaO2/FiO2 stays <150 despite optimized invasive ventilation. [\[3\]](#cite-3 "Reference [3]") - **Neuromuscular blockade** is a mechanics tool, not an oxygen drug. Use it when dyssynchrony or unsafe spontaneous effort prevents lung protection. [\[3\]](#cite-3 "Reference [3]") - **Inhaled vasodilators** may transiently improve oxygenation and RV afterload, but routine use is not supported by outcome data. [\[2\]](#cite-2 "Reference [2]") - Board pitfall: never confuse improvement in PaO2/FiO2 with proof of mortality benefit. [\[10\]](#cite-10 "Reference [10]") Conclusion ---------- In refractory hypoxemia, don’t ask which adjunct is “best.” Ask which physiologic problem you are trying to solve. In ARDS, prone early, paralyze selectively, and use inhaled vasodilators as rescue bridges—not as substitutes for evidence-based lung protection. [\[3\]](#cite-3 "Reference [3]") Frequently Asked Questions ---------------------------- ### Does a strong response to inhaled nitric oxide mean the patient is improving in a meaningful way? Not necessarily. In adult ARDS, iNO may improve oxygenation transiently, but it has not shown clear mortality benefit; use it as a rescue bridge while definitive strategies are pursued. [\[5\]](#cite-5 "Reference [5]") ### Should every patient undergoing prone ventilation also receive continuous neuromuscular blockade? No. The 2026 SCCM guideline found equipoise on routine NMBA use solely because a patient is proned. Use paralysis when dyssynchrony or unsafe respiratory effort prevents lung-protective targets. [\[7\]](#cite-7 "Reference [7]") ### What practical threshold should trigger proning in intubated ARDS? Think early when PaO2/FiO2 remains below 150 mmHg despite low-tidal-volume ventilation and adjusted PEEP; prolonged sessions of about 16 hours or more best match the evidence base. [\[3\]](#cite-3 "Reference [3]") ### How long should neuromuscular blockade usually continue when used in ARDS? Current evidence supports early, short courses, generally up to 48 hours, with frequent reassessment and a plan to return to lighter sedation or spontaneous breathing when safe. [\[1\]](#cite-1 "Reference [1]") References (13) ------------------- 1. 1. [ An Update on Management of Adult Patients with Acute Respiratory Distress Syndrome: An Official American Thoracic Society Clinical Practice Guideline, 2024 ](https://academic.oup.com/ajrccm/article/209/1/24/8427573) [↩](#cite-ref-1-1 "Back to text") 2. 2. [ pmc.ncbi.nlm.nih.gov/articles/PMC6186554 ](https://pmc.ncbi.nlm.nih.gov/articles/PMC6186554/) [↩](#cite-ref-2-1 "Back to text") 3. 3. [ pureadmin.qub.ac.uk/ws/portalfiles/portal/584378484/s00134-023-07050-7.pdf ](https://pureadmin.qub.ac.uk/ws/portalfiles/portal/584378484/s00134-023-07050-7.pdf) [↩](#cite-ref-3-1 "Back to text") 4. 4. [ publications.ersnet.org/content/erj/44/4/1023 ](https://publications.ersnet.org/content/erj/44/4/1023) [↩](#cite-ref-4-1 "Back to text") 5. 5. [ pmc.ncbi.nlm.nih.gov/articles/PMC12866168 ](https://pmc.ncbi.nlm.nih.gov/articles/PMC12866168/) [↩](#cite-ref-5-1 "Back to text") 6. 6. [ pmc.ncbi.nlm.nih.gov/articles/PMC6680148 ](https://pmc.ncbi.nlm.nih.gov/articles/PMC6680148/) [↩](#cite-ref-6-1 "Back to text") 7. 7. [ Society of Critical Care Medicine Guidelines for the Administration of Neuromuscular Blockade in Adults With ARDS, 2026 ](https://www.sccm.org/clinical-resources/guidelines/guidelines/guidelines-for-the-administration-of-neuromuscular-blockade) [↩](#cite-ref-7-1 "Back to text") 8. 8. [ academic.oup.com/ajrccm/article/195/9/1253/8500154 ](https://academic.oup.com/ajrccm/article/195/9/1253/8500154) [↩](#cite-ref-8-1 "Back to text") 9. 9. [ An Official ATS/ESICM/SCCM Clinical Practice Guideline: Mechanical Ventilation in Adult Patients with ARDS, 2017 ](https://www.thoracic.org/statements/resources/cc/ards-guidelines.pdf) [↩](#cite-ref-9-1 "Back to text") 10. 10. [ pubmed.ncbi.nlm.nih.gov/27347773 ](https://pubmed.ncbi.nlm.nih.gov/27347773/) [↩](#cite-ref-10-1 "Back to text") 11. 11. [ ESICM guidelines on acute respiratory distress syndrome: definition, phenotyping and respiratory support strategies, 2023 ](https://link.springer.com/article/10.1007/s00134-023-07050-7) 12. 12. [ Guérin C, et al. Prone positioning in severe acute respiratory distress syndrome (PROSEVA). N Engl J Med. 2013 ](https://pubmed.ncbi.nlm.nih.gov/23688302/) 13. 13. 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