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[ Home ](https://mdster.com) 2. [ Blog ](https://mdster.com/blog) 3. [ Case Discussion ](https://mdster.com/blog?category=case-discussion) 4. Septic Shock RSI and CICO: A Difficult Airway Case Discussion [ Case Discussion ](https://mdster.com/blog?category=case-discussion) Septic Shock RSI and CICO: A Difficult Airway Case Discussion =============================================================== When obesity, OSA, and shock physiology turn a routine RSI into a rapidly fatal oxygenation problem. [ MDster Editorial Team ](https://mdster.com/about) · Jul 09, 2026 · 6 min read · 46 [ 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) [ Board Review ](https://mdster.com/blog?tag=board-review) [ Anesthesiology ](https://mdster.com/blog?tag=anesthesiology) [ Septic Shock ](https://mdster.com/blog?tag=septic-shock) [ Difficult Airway ](https://mdster.com/blog?tag=difficult-airway) [ Rapid Sequence Induction ](https://mdster.com/blog?tag=rapid-sequence-induction) [ CICO ](https://mdster.com/blog?tag=cico) ![Septic Shock RSI and CICO: A Difficult Airway Case Discussion](https://mdster.com/storage/blog/images/septic-shock-rsi-and-cico-a-difficult-airway-case-discussion.jpg) Share this article Share this post On this page 1. [ Why this airway fails fast ](#why-this-airway-fails-fast) 2. [ Anatomy meets physiology ](#anatomy-meets-physiology) 3. [ Pre-induction strategy ](#pre-induction-strategy) 4. [ When Plan A fails ](#when-plan-a-fails) 5. [ Failed laryngoscopy is a declaration, not a surprise ](#failed-laryngoscopy-is-a-declaration-not-a-surprise) 6. [ Differential diagnosis of failed rescue oxygenation ](#differential-diagnosis-of-failed-rescue-oxygenation) 7. [ CICO means move, not think harder ](#cico-means-move-not-think-harder) 8. [ Plan D: scalpel-bougie-tube ](#plan-d-scalpel-bougie-tube) 9. [ Clinical application ](#clinical-application) 10. [ Key Points for Board Exams ](#key-points-for-board-exams) 11. [ Conclusion ](#conclusion) 12. [ Frequently Asked Questions ](#blog-faqs) 13. [ References ](#references-heading) On this page 1. [ Why this airway fails fast ](#why-this-airway-fails-fast) 2. [ Anatomy meets physiology ](#anatomy-meets-physiology) 3. [ Pre-induction strategy ](#pre-induction-strategy) 4. [ When Plan A fails ](#when-plan-a-fails) 5. [ Failed laryngoscopy is a declaration, not a surprise ](#failed-laryngoscopy-is-a-declaration-not-a-surprise) 6. [ Differential diagnosis of failed rescue oxygenation ](#differential-diagnosis-of-failed-rescue-oxygenation) 7. [ CICO means move, not think harder ](#cico-means-move-not-think-harder) 8. [ Plan D: scalpel-bougie-tube ](#plan-d-scalpel-bougie-tube) 9. [ Clinical application ](#clinical-application) 10. [ Key Points for Board Exams ](#key-points-for-board-exams) 11. [ Conclusion ](#conclusion) 12. [ Frequently Asked Questions ](#blog-faqs) 13. [ References ](#references-heading) A 24-year-old man with peritonitis arrives in septic shock: confused, tachypneic, hypoxemic, obese, and anatomically high risk for difficult mask ventilation. After RSI, direct laryngoscopy yields a Grade 4 view, mask ventilation is poor, and the saturation falls through 75%. This is the airway disaster residents must recognize early: the anatomy is difficult, but the physiology is what kills first. The SOE stem follows the classic DAS 2015 Plan A–D framework; as of July 2026, DAS also hosts updated adult difficult intubation guidance, while ASA 2022 continues to emphasize oxygenation, limiting repeated attempts, and preparedness for invasive rescue. [\[1\]](#cite-1 "Reference [1]") Why this airway fails fast -------------------------- ### Anatomy meets physiology The difficult mask ventilation predictors are stacked: obesity, OSA, beard, male sex, and a short thick neck. More importantly, sepsis and abdominal pathology shrink reserve before induction even starts. His pH 7.25 with lactate 4.5 mmol/L tells you the tachypnea is compensatory; once apnea follows induction, desaturation and acidemia accelerate. Failure modeClue in this caseImmediate implicationPoor mask sealBeard, obesityTwo-person technique and adjuncts will likely be neededRapid desaturationObesity, shunt, sepsisSafe apnea time is short despite preoxygenationHemodynamic collapseBP 85/45 after fluidsInduction must be vasopressor-ready ### Pre-induction strategy For critically ill adults, DAS recommends head-up positioning if possible, waveform capnography, preoxygenation with facemask/CPAP/NIV/nasal oxygen, cardiovascular optimization, and explicit sharing of the failure plan before laryngoscopy. Continuous nasal oxygenation and facemask ventilation between attempts are built into the algorithm, not afterthoughts. [\[2\]](#cite-2 "Reference [2]") In practice, this means the difficult airway trolley is open before drugs, a second-generation SAD is at hand, and the front-of-neck set is already out. I would also identify the cricothyroid membrane before induction in this neck. In septic shock, clinical judgment dictates reduced-dose induction and full neuromuscular blockade; the half-anesthetized, poorly paralyzed patient is often harder to oxygenate than the fully relaxed one. [\[2\]](#cite-2 "Reference [2]") > **Clinical Pearl:** In septic shock, the most dangerous seconds are often immediately after induction, when sympathetic tone, pharyngeal tone, and FRC all disappear at once. When Plan A fails ----------------- ### Failed laryngoscopy is a declaration, not a surprise Once the Grade 4 view appears, the key move is verbal: **declare failed intubation**. DAS 2015 limits direct or video laryngoscopy to a maximum of 3+1 attempts with optimization, not repetitive trauma. The endpoint is oxygenation, not proving that one more look might work. [\[1\]](#cite-1 "Reference [1]") Immediate corrective actions include: - Call for help early. - Re-optimize head and neck position. - Use external laryngeal manipulation and a bougie if any view is obtained. - Remove cricoid pressure if it is worsening the laryngoscopic view. - Maintain anesthesia while transitioning to rescue oxygenation. DAS Plan B is insertion of a **second-generation SAD**. If it fails, Plan C is a final attempt at facemask ventilation using a two-person technique with airway adjuncts; if facemask ventilation is impossible, the algorithm explicitly supports paralysis before that final attempt. [\[1\]](#cite-1 "Reference [1]") ### Differential diagnosis of failed rescue oxygenation Not every failed rescue attempt means the same thing. In this case, think in parallel: CauseTypical cluePractical responsePoor mask sealAudible leak, poor chest riseTwo-person mask hold, oral/nasal airwayPharyngeal collapseObesity/OSA after inductionJaw thrust, adjuncts, adequate paralysisSAD malposition or esophageal ventilationETCO2 briefly appears then fadesReposition or replace; do not accept this as successCircuit/oxygen problemNo improvement despite good techniqueExclude equipment failure immediately A low-amplitude square ETCO2 trace that disappears to zero over a few breaths is not reassuring. Treat it as ineffective or non-tracheal ventilation until proven otherwise. NAP4 made the broader lesson clear: failure to use or interpret capnography correctly is a recurring pathway to major airway harm. [\[3\]](#cite-3 "Reference [3]") CICO means move, not think harder --------------------------------- ### Plan D: scalpel-bougie-tube If SAD attempts fail and final facemask ventilation is not restoring oxygenation, declare **CICO** and proceed immediately to front-of-neck access. DAS recommends continuing upper-airway oxygen, ensuring neuromuscular blockade, extending the neck if possible, and performing scalpel cricothyroidotomy. Repeated extra attempts at laryngoscopy or SAD rescue simply consume the last oxygen reserve. [\[1\]](#cite-1 "Reference [1]") The DAS scalpel-bougie-tube sequence is straightforward: 1. Stabilize the larynx and identify the cricothyroid membrane with the laryngeal handshake. 2. Make a transverse stab incision through the membrane. 3. Rotate the blade 90 degrees with the cutting edge caudad. 4. Slide the bougie into the trachea alongside the blade. 5. Railroad a lubricated cuffed 6.0 tube, inflate the cuff, ventilate, and confirm with capnography. If the membrane is impalpable, make a large vertical incision first, use blunt finger dissection, then complete the cricothyroidotomy. [\[1\]](#cite-1 "Reference [1]") Clinical application -------------------- After rescue, the job is not finished. A cricothyrotomy is a temporary emergency airway, and the ICU handover must include the chronology, number of attempts, Cormack-Lehane grade, devices used, ETCO2 findings, lowest SpO2, drugs and vasopressors given, complications, and the plan for definitive airway management. DAS also emphasizes postoperative follow-up, airway alert documentation, and explaining the event to the patient in person and in writing. [\[1\]](#cite-1 "Reference [1]") Key Points for Board Exams -------------------------- - In septic shock, airway management is a physiology problem before it becomes a laryngoscopy problem. - Obesity, OSA, beard, male sex, and a short thick neck should make you expect difficult mask ventilation. - Head-up preoxygenation, CPAP/NIV when needed, continuous nasal oxygen, and cardiovascular optimization are guideline-level moves in the critically ill. [\[2\]](#cite-2 "Reference [2]") - Failed intubation should be declared early; DAS 2015 limits laryngoscopy to 3+1 attempts. [\[1\]](#cite-1 "Reference [1]") - If rescue oxygenation fails, declare CICO early and commit to scalpel-bougie-tube. [\[1\]](#cite-1 "Reference [1]") Conclusion ---------- The exam-winning insight is knowing when to pivot. This case is passed not by naming devices, but by recognizing that oxygenation is the only real priority after Plan A fails. Those principles remain consistent with ASA 2022, the classic DAS failed-intubation pathway, and the current DAS airway guidance available in July 2026. [\[4\]](#cite-4 "Reference [4]") Frequently Asked Questions ---------------------------- ### Should septic shock automatically push you toward ketamine instead of propofol? Not automatically. The bigger issue is dose reduction, vasopressor readiness, and pre-intubation resuscitation; many clinicians avoid full-dose propofol in profound shock because it can worsen hypotension. ### Why is a second-generation SAD preferred in failed intubation rescue? Current DAS algorithms favor a second-generation device because it generally offers a better seal and a gastric drainage channel, improving the chance of rescue oxygenation. [\[1\]](#cite-1 "Reference [1]") ### What does an ETCO2 trace that fades to zero over three breaths usually mean? It should be treated as ineffective or non-tracheal ventilation until proven otherwise, rather than accepted as successful rescue. Capnography interpretation errors were a major theme in NAP4. [\[3\]](#cite-3 "Reference [3]") ### When should CICO be declared in this scenario? As soon as tracheal intubation has failed and upper-airway rescue techniques are not restoring oxygenation. The critical mistake is delaying eFONA while repeating low-yield attempts. [\[1\]](#cite-1 "Reference [1]") ### What must be documented after emergency cricothyrotomy? Document the sequence of events, devices and attempts, laryngoscopic grade, capnography findings, lowest saturation, complications, current airway status, and the definitive airway plan. Airway alert documentation and patient notification are also recommended. [\[1\]](#cite-1 "Reference [1]") References (5) ------------------ 1. 1. [ Difficult Airway Society 2015 guidelines for management of unanticipated difficult intubation in adults ](https://database.das.uk.com/files/das2015intubation_guidelines.pdf) [↩](#cite-ref-1-1 "Back to text") 2. 2. [ DAS, ICS, FICM, RCoA Guideline for tracheal intubation in critically ill adults (2017 algorithm) ](https://database.das.uk.com/files/2017/page/DAS_ICU_guidelines.pdf) [↩](#cite-ref-2-1 "Back to text") 3. 3. [ Royal College of Anaesthetists. NAP4: Major Complications of Airway Management in the United Kingdom. ](https://rcoa.ac.uk/research/research-projects/national-audit-projects-naps/nap4-major-complications-airway-management) [↩](#cite-ref-3-1 "Back to text") 4. 4. [ Apfelbaum JL, Hagberg CA, Connis RT, et al. 2022 American Society of Anesthesiologists Practice Guidelines for Management of the Difficult Airway. Anesthesiology. 2022;136(1):31-81. ](https://pubmed.ncbi.nlm.nih.gov/34762729/) [↩](#cite-ref-4-1 "Back to text") 5. 5. 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Explore topics: [ # Board Review ](https://mdster.com/blog?tag=board-review) [ # Anesthesiology ](https://mdster.com/blog?tag=anesthesiology) [ # Septic Shock ](https://mdster.com/blog?tag=septic-shock) [ # Difficult Airway ](https://mdster.com/blog?tag=difficult-airway) [ # Rapid Sequence Induction ](https://mdster.com/blog?tag=rapid-sequence-induction) [ # CICO ](https://mdster.com/blog?tag=cico) [ Back to all posts ](https://mdster.com/blog) Discussion () ----------------- Join the discussion [ Log in ](https://mdster.com/auth/login) or [ Sign up ](https://mdster.com/auth/register) No comments yet Be the first to share your thoughts! ![]() More in Case Discussion ----------------------- [ See all ](https://mdster.com/blog?category=case-discussion) [### Borderline Personality Disorder Crisis: Safe ED Medication Choices 7 min read Jul 06, 2026 ](https://mdster.com/blog/borderline-personality-disorder-crisis-safe-ed-medication-choices) [### Adhesive Capsulitis Case Discussion: The Stiff Painful Shoulder 7 min read Jul 04, 2026 ](https://mdster.com/blog/adhesive-capsulitis-case-discussion-the-stiff-painful-shoulder) [### Pediatric Cystic Fibrosis Case: Cough, Steatorrhea, Clubbing 7 min read Jul 02, 2026 ](https://mdster.com/blog/pediatric-cystic-fibrosis-case-cough-steatorrhea-clubbing) Related Posts ------------- [ ![Borderline Personality Disorder Crisis: Safe ED Medication Choices](https://mdster.com/storage/blog/images/borderline-personality-disorder-crisis-safe-ed-medication-choices.jpg) Case Discussion ### Borderline Personality Disorder Crisis: Safe ED Medication Choices A case discussion for psychiatry trainees on managing acute borderline personality disorder crisis in the ED, with practical guidance on benzodiazepines, promethazine, overdose safety, and DBT. 7 min read 0 comments ](https://mdster.com/blog/borderline-personality-disorder-crisis-safe-ed-medication-choices) [ ![Placental to Pulmonary Gas Exchange Transition in Newborns](https://mdster.com/storage/blog/images/placental-to-pulmonary-gas-exchange-transition-in-newborns.jpg) Medical Education ### Placental to Pulmonary Gas Exchange Transition in Newborns A focused pediatrics review of how newborns switch from placental to pulmonary gas exchange, with delayed cord clamping, fetal shunts, falling PVR, and board-style pearls. 7 min read 0 comments ](https://mdster.com/blog/placental-to-pulmonary-gas-exchange-transition-in-newborns) [ ![ICP Physiology for Anesthesiology: CPP, Monro–Kellie, Herniation](https://mdster.com/storage/blog/images/icp-physiology-for-anesthesiology-cpp-monro-kellie-herniation.jpg) Medical Education ### ICP Physiology for Anesthesiology: CPP, Monro–Kellie, Herniation Master ICP physiology for boards and bedside care: understand Monro–Kellie, why CPP falls when MAP drops, and how to recognize herniation early. 8 min read 0 comments ](https://mdster.com/blog/icp-physiology-for-anesthesiology-cpp-monro-kellie-herniation) [ ![Adhesive Capsulitis Case Discussion: The Stiff Painful Shoulder](https://mdster.com/storage/blog/images/adhesive-capsulitis-case-discussion-the-stiff-painful-shoulder.jpg) Case Discussion ### Adhesive Capsulitis Case Discussion: The Stiff Painful Shoulder A case-based review of adhesive capsulitis covering key diagnostic clues, imaging decisions, steroid injection counseling, and escalation for refractory stiffness. 7 min read 0 comments ](https://mdster.com/blog/adhesive-capsulitis-case-discussion-the-stiff-painful-shoulder) [ ![Baseline Labs for Psychotropics and Differential Diagnosis](https://mdster.com/storage/blog/images/baseline-labs-for-psychotropics-and-differential-diagnosis.jpg) Medical Education ### Baseline Labs for Psychotropics and Differential Diagnosis A practical psychiatry guide to baseline labs that actually change care: rule out medical mimics, start psychotropics safely, and avoid board-style monitoring mistakes. 8 min read 0 comments ](https://mdster.com/blog/baseline-labs-for-psychotropics-and-differential-diagnosis) [ ![Pediatric Cystic Fibrosis Case: Cough, Steatorrhea, Clubbing](https://mdster.com/storage/blog/images/pediatric-cystic-fibrosis-case-cough-steatorrhea-clubbing.jpg) Case Discussion ### Pediatric Cystic Fibrosis Case: Cough, Steatorrhea, Clubbing A pediatric cystic fibrosis case discussion covering chronic wet cough, steatorrhea, clubbing, sweat chloride testing, pulmonary exacerbation care, PERT, and follow-up. 7 min read 0 comments ](https://mdster.com/blog/pediatric-cystic-fibrosis-case-cough-steatorrhea-clubbing) [ MDster home ](/ "MDster home") Master your medical exams with evidence-based learning. 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