I need a quick summarized algorithm of difficult airway from DAS ( intubation and extubation), AIDAA (intubation and extubation) , DAS for obstetrics airway DAS for pediatric airway,
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DAS difficult airway society intubation extubation guidelines algorithm 2015 2022 summary
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AIDAA difficult airway guidelines algorithm intubation extubation India 2022 2023
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DAS intubation extubation obstetric pediatric algorithm plan A B C D
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AIDAA 2025 algorithm unanticipated difficult airway adults steps plan
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AIDAA 2025 extubation at-risk airway algorithm steps
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AIDAA 2016 obstetric pediatric difficult airway guidelines algorithm summary
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Difficult Airway Algorithms — Quick Reference Summary
1. DAS 2015 — Unanticipated Difficult Intubation in Adults
Core Concept: Plan A → B → C → D (stop-and-think between each)
Pre-induction: Assess airway, pre-oxygenate, state a backup plan before every induction.
PLAN A — Facemask ventilation + Tracheal intubation
- Optimize head/neck position (ramping in obese); use NODESAT/THRIVE nasal O₂
- ≤3 laryngoscopy attempts (include 1 by experienced colleague)
- Use video laryngoscopy, bougie, external laryngeal manipulation
- Confirm intubation with capnography (6 consecutive waveforms)
- ✅ Succeed → proceed | ❌ Fail → call for help → Plan B
PLAN B — Supraglottic Airway (SAD) for oxygenation
- Insert 2nd-generation SAD (e.g., ProSeal, i-gel, Supreme)
- Max 2 attempts
- SAD can be used to: (a) oxygenate + wake up, (b) intubate through SAD, (c) proceed without intubating
- ✅ Oxygenation restored → STOP AND THINK (4 options below) | ❌ Fail → Plan C
STOP AND THINK — 4 options:
- Wake the patient up
- Intubate through the SAD (fibreoptic-guided)
- Proceed without intubation (if surgery permits)
- Tracheostomy/cricothyroidotomy (elective)
PLAN C — Final attempt at facemask ventilation
- 2-person technique + airway adjuncts (OPA/NPA)
- ✅ Success → wake up the patient | ❌ Fail → CICO → Plan D
PLAN D — Emergency Front-of-Neck Access (eFONA) — CICO situation
- Scalpel-bougie-tube cricothyroidotomy (preferred over cannula)
- Landmark: transverse stab incision → caudal traction → bougie → 6.0 cuffed tube
Post-event: Monitor for complications, complete airway alert form, explain to patient in writing, notify GP and local database.
2. DAS 2013 — Extubation Guidelines
Step 1: Classify Risk
| Low-Risk | "At-Risk" |
|---|---|
| No airway difficulty at intubation, no ongoing risk factors | Known/suspected difficult airway, access issues, obesity, OSA, surgical factors, haemodynamic instability |
LOW-RISK Extubation
- Optimize patient (position, reversal of NMB, warm, oxygenated)
- Suction (direct vision)
- Awake extubation (preferred routine) OR asleep extubation (select cases only)
- Post-extubation: O₂ supplementation, recovery position, monitoring
AT-RISK Extubation (structured approach)
Step 1 — Formulate Plan:
- Can patient tolerate re-intubation? Is airway expected to deteriorate?
- Technique choice: awake (standard), awake-advanced, or asleep
Step 2 — Awake extubation (standard):
- Ensure full reversal of NMB (quantitative TOF preferred)
- Suction under direct vision; ensure cooperative, oxygenated patient
- Have re-intubation plan and equipment ready
Step 3 — Advanced techniques (if standard too risky):
- Airway Exchange Catheter (AEC): Leave in situ as a rail for re-intubation (max 72h); always confirm with capnography if re-intubated via AEC
- Remifentanil infusion: Provides smooth extubation while maintaining respiratory drive and airway reflexes
- SAD exchange: Replace ETT with LMA, allow recovery, then remove SAD
Step 4 — Post-extubation care:
- O₂ throughout transfer; document difficulties; handover to recovery team
3. DAS/OAA 2015 — Obstetric Difficult Airway
Key Principles
- RSI is standard (full stomach/aspiration risk); left lateral tilt
- Lower SpO₂ threshold for action (faster desaturation than non-pregnant)
- Fetal welfare and maternal safety both considered
- Team communication is critical: call obstetrician early
Master Algorithm (GA Caesarean Section)
Pre-induction:
- Pre-oxygenate (3-5 min or 8 vital capacity breaths with tight-fitting mask, +HFNO)
- Ramped/head-up position; antacid prophylaxis (ranitidine/sodium citrate)
- RSI: cricoid pressure + propofol/thiopentone + suxamethonium
PLAN A — Tracheal intubation:
- Optimized direct or video laryngoscopy; bougie
- Max 2 attempts (1 retry with optimized conditions/different device)
- ✅ Intubated → confirm capnography, maintain cricoid pressure until cuff inflated
FAILED INTUBATION → STOP AND THINK:
Immediate decision based on: urgency of surgery, ability to ventilate
| Scenario | Action |
|---|---|
| Can ventilate + non-urgent | Wake up → regional/awake fibreoptic |
| Can ventilate + life-threatening (maternal/fetal) | Proceed with SAD (2nd-generation, e.g., i-gel) |
| CICO | Emergency FONA (scalpel cricothyroidotomy) |
PLAN B — Oxygenation with SAD:
- 2nd-generation SAD; max 2 attempts
- If successful and proceeding with surgery: maintain cricoid pressure, use lowest leak pressure, continuous capnography
PLAN C — Face mask ventilation (2-person if needed)
PLAN D — Emergency FONA / cricothyroidotomy
Post-event:
- Maintain cricoid through extubation (if risk of aspiration)
- Complete airway alert form; debrief patient and team
4. DAS/APA — Pediatric Difficult Airway
Key Differences from Adults
- Anatomy: Large head, short neck, anterior/cephalad larynx, short trachea, large tongue
- Maintain spontaneous ventilation where possible (less reserve, faster desaturation)
- Sedation preferred over paralysis in anticipated difficulty
- Smaller SAD sizes; straight blade often preferred <2 years
- FONA = needle cricothyroidotomy in small children (<8 yr); surgical in older
Algorithm 1: Difficult Mask Ventilation
- Reposition (neutral in infant, sniffing in older child)
- OPA/NPA; 2-person technique
- If persistent failure → SAD insertion
- CICO → emergency needle cricothyroidotomy (< 8yr) or scalpel cricothyroidotomy (≥ 8yr)
Algorithm 2: Unanticipated Difficult Tracheal Intubation (1–8 yr, paralysed)
PLAN A: Direct laryngoscopy with optimization (OELM, pillow under shoulders)
- Max 2 attempts; call for senior help after 1st failure
PLAN B: Alternative laryngoscopy/device
- Videolaryngoscope (e.g., C-MAC, Storz), or smaller tube with stylet
- 1–2 attempts
PLAN C: SAD insertion (i-gel, LMA Classic)
- Oxygenate; STOP AND THINK → wake up or proceed through SAD
PLAN D: CICO → Emergency airway access
- Age < 8yr: wide-bore cannula cricothyroidotomy (jet ventilation via Manujet or 50ml syringe)
- Age ≥ 8yr: scalpel-bougie-tube (as per adult technique with smaller tube)
5. AIDAA 2025 — Unanticipated Difficult Airway in Adults (Updated)
Core Concept: Maintain SpO₂ ≥95% at every step; "Code D" as emergency alert
Primary Airway Plan (intubation, SGA, facemask, or TIVA + oxygen):
- Use video laryngoscopy as first-line where available
- Confirm intubation with 6 consecutive sustained capnography waveforms
If Primary Plan Fails:
- Declare "Code D" — hospital emergency code for difficult airway; call for experienced help immediately
- Maintain depth of anaesthesia throughout rescue attempts
- Deliver nasal O₂ throughout (THRIVE/HFNO preferred)
- Track SpO₂ and time elapsed continuously
Airway Rescue — No hierarchy between devices:
- Switch promptly between tracheal tube (TT), SGA, and facemask
- Max 3 attempts each with TT, SGA, and mask ventilation
- Proceed to next attempt only if SpO₂ ≥95%
- If SpO₂ not maintained or bradycardia → bypass steps → emergency cricothyroidotomy immediately
Complete Ventilation Failure (CVF) — all three fail:
- → Emergency cricothyroidotomy without delay
Post-event: Document, airway alert form, patient communication, follow-up
6. AIDAA 2025 — Extubation of the "At-Risk" Airway
Framework: SAFE
| Letter | Action |
|---|---|
| S — Stratify Risk | Classify: routine vs. "at-risk" (known difficult airway, airway edema, obesity, OSA, prolonged intubation, neck surgery, etc.) |
| A — Assemble & Anticipate | Assemble equipment, experienced personnel, re-intubation plan; anticipate complications |
| F — Facilitate Extubation | Execute extubation using the appropriate technique (see below) |
| E — Evaluate & Escalate | Monitor post-extubation; escalate early if deterioration |
AT-RISK Extubation — 3 Limbs (3 Ds + 3 Ss)
Limb 1 — Routine at-risk extubation (conditions manageable with standard care)
Limb 2 — 3 Ds (difficult conditions):
- Difficult re-intubation expected
- Deteriorating airway (edema, bleeding, hematoma)
- Dependency on tube (e.g., tracheomalacia, cervical instability)
Limb 3 — 3 Ss (special techniques):
- Staged Sequential Extubation (SSE): Remove ETT over an Airway Exchange Catheter (AEC), allowing re-intubation if needed; or step down to SAD then remove
- Supervised extubation in controlled environment (HDU/ICU) with senior presence
- Stay intubated: Delayed extubation when airway is not safe yet
Post-extubation for all at-risk: Continue O₂ (PerEOx — peri-extubation oxygenation), handover with re-intubation plan, stay alert for laryngospasm, bronchospasm, stridor, NPPE, aspiration.
Quick Comparison Table
| Feature | DAS 2015 (Adult Intubation) | DAS Extubation | DAS Obstetrics | DAS Pediatric | AIDAA 2025 Intubation | AIDAA 2025 Extubation |
|---|---|---|---|---|---|---|
| Structure | Plan A→B→C→D | Risk classify → technique | RSI → Plan A→B→C→D | Plan A→B→C→D (age-adjusted) | Primary plan → Code D → rescue | SAFE framework |
| Max intubation attempts | 3 total (Plan A) | — | 2 (more conservative) | 2–3 | 3 TT + 3 SGA + 3 mask | — |
| CICO rescue | Scalpel-bougie (surgical) | — | Scalpel-bougie (surgical) | Needle (<8yr) / scalpel (≥8yr) | Emergency cricothyroidotomy | — |
| Key trigger | Failed intubation | Risk stratification | Failed intubation during RSI | Failed intubation | SpO₂ <95% / bradycardia | Any at-risk feature |
| Key innovation | Simplified overview + detailed version | AEC / remifentanil techniques | 2 attempts max; wake up vs. proceed decision | Spontaneous ventilation preference | "Code D" + no-hierarchy device switching | SAFE + SSE + 3Ds/3Ss |
| Confirm intubation | Capnography | — | Capnography + cricoid until cuff inflated | Capnography | 6 consecutive capnography waveforms | — |
Key references:
- DAS 2015 intubation: Frerk et al., BJA 2015
- DAS extubation 2012: Mitchell et al., Anaesthesia 2012
- DAS obstetric 2015: Mushambi et al., Anaesthesia 2015
- DAS pediatric 2015: Difficult Airway Society / APA
- AIDAA 2025 intubation: PMC12643155
- AIDAA 2025 extubation: PMC12643154
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The full summary is ready above! Here's a quick orientation to help you navigate it:
What's included:
- DAS 2015 Adult Intubation — Plan A→B→C→D with attempt limits and FONA (scalpel-bougie)
- DAS 2013 Extubation — Risk stratify (low-risk vs. at-risk) → AEC / remifentanil / SAD exchange techniques
- DAS/OAA 2015 Obstetrics — RSI-based, max 2 intubation attempts, wake-up vs. proceed decision tree, CICO management
- DAS/APA Pediatrics — Age-adjusted plans, spontaneous ventilation preference, needle vs. scalpel FONA by age
- AIDAA 2025 Adult Intubation — "Code D" activation, no-hierarchy device switching (TT/SGA/mask), SpO₂ ≥95% gate before each attempt
- AIDAA 2025 Extubation — SAFE framework + 3 Ds / 3 Ss limb system + Staged Sequential Extubation (SSE)
A few high-yield distinctions to remember:
- DAS obstetrics allows only 2 laryngoscopy attempts (vs. 3 in adult general)
- AIDAA's "Code D" is a unique institutional emergency activation concept
- AIDAA explicitly states no hierarchy between TT, SGA, and mask during rescue — switch freely
- DAS pediatric FONA differs by age: needle (<8 yr) vs. scalpel (≥8 yr)
- AIDAA 2025 extubation introduced SSE (Staged Sequential Extubation) as a formal strategy
Let me know if you'd like any section expanded, a printable table, or a specific scenario walked through.
Need all and need summarise to write in exam
Here is a tight, exam-ready write-up for all six algorithms — structured so you can reproduce it in an exam in logical order.
DIFFICULT AIRWAY ALGORITHMS — EXAM WRITE-UP
1. DAS 2015 — Unanticipated Difficult Intubation in Adults
Pre-induction essentials:
- Airway assessment + pre-oxygenation (3–5 min or 8 vital capacity breaths)
- State a backup plan before every induction
- Nasal O₂ (THRIVE/HFNO) throughout
Plan A — Facemask ventilation + Tracheal intubation
- Optimise position (ramp obese patients), use video laryngoscopy + bougie
- Maximum 3 attempts (one may be by a senior colleague)
- Confirm with capnography
- Fail → call for help → Plan B
Plan B — SAD insertion (oxygenation priority)
- Insert 2nd-generation SAD (i-gel, ProSeal, Supreme)
- Maximum 2 attempts
- If SAD ventilates → STOP AND THINK → 4 options:
- Wake patient up
- Intubate through SAD (fibreoptic)
- Proceed without intubation (if appropriate)
- Elective surgical airway
- Fail → Plan C
Plan C — Final facemask ventilation attempt
- 2-person technique + OPA/NPA
- Success → wake up | Fail → CICO → Plan D
Plan D — Emergency Front-of-Neck Access (eFONA)
- Scalpel-bougie-tube cricothyroidotomy
- Stab incision → caudal traction → bougie → size 6.0 cuffed tube
Post-event: Airway alert form, written explanation to patient, notify GP
2. DAS 2012/2013 — Extubation Guidelines
Step 1: Stratify Risk
| Low Risk | At Risk |
|---|---|
| Easy intubation, no complications, no ongoing risk factors | Difficult intubation, obesity, OSA, airway oedema, restricted access, haemodynamic instability |
Low-Risk Extubation
- Fully reverse NMB; optimise position + oxygenation
- Suction under direct vision
- Awake extubation (preferred) OR asleep (selected cases)
- Post-extubation O₂ + monitoring
At-Risk Extubation — 3 Techniques
- Awake extubation (standard) — full reversal, co-operative, oxygenated patient; re-intubation plan ready
- Airway Exchange Catheter (AEC) — leave in situ after extubation; re-intubate over AEC if needed; confirm with capnography
- SAD exchange / Remifentanil technique — replace ETT with LMA; remifentanil infusion maintains spontaneous ventilation + reflexes during extubation
Post-extubation: O₂ throughout transfer, detailed handover, document all difficulties
3. DAS/OAA 2015 — Obstetric Difficult Airway
Key differences from general adult:
- RSI is standard (full stomach risk); left lateral tilt
- Faster desaturation → lower threshold for action
- Only 2 laryngoscopy attempts (more conservative than general DAS)
- Dual concern: maternal and fetal safety
- Always include obstetrician in decision-making
Algorithm (GA Caesarean Section)
Pre-induction:
- Pre-oxygenate + HFNO; antacid prophylaxis
- RSI: cricoid pressure + propofol/thiopentone + suxamethonium
Plan A — Tracheal intubation (max 2 attempts):
- Optimised DL or VL + bougie; maintain cricoid pressure
- Confirm with capnography; maintain cricoid until cuff inflated
Failed intubation → STOP AND THINK:
| Situation | Action |
|---|---|
| Can ventilate + non-urgent surgery | Wake up → regional/awake FOI |
| Can ventilate + life-threatening (maternal or fetal) | Proceed with 2nd-gen SAD (i-gel preferred) |
| CICO | Emergency eFONA (scalpel cricothyroidotomy) |
Plan B: 2nd-generation SAD — max 2 attempts
Plan C: 2-person facemask ventilation
Plan D: Scalpel cricothyroidotomy
Post-event: Cricoid maintained till full airway protection; airway alert form; debrief team + patient
4. DAS/APA — Paediatric Difficult Airway
Key anatomical/physiological differences:
- Large head, short neck, anterior/cephalad larynx, large tongue, short trachea
- Faster desaturation; less respiratory reserve
- Prefer to maintain spontaneous ventilation in anticipated difficulty
- Straight blade preferred < 2 years
Algorithm 1: Difficult Mask Ventilation
- Reposition (neutral infant; sniffing in older child)
- OPA/NPA + 2-person technique
- Fail → SAD insertion
- CICO → emergency airway access (age-dependent — see below)
Algorithm 2: Unanticipated Difficult Tracheal Intubation (1–8 yr, paralysed)
Plan A: DL with optimisation (OELM, shoulder roll) — max 2 attempts; call for help after 1st failure
Plan B: Alternative device — VL (C-MAC/Storz), stylet — 1–2 attempts
Plan C: SAD insertion (i-gel/LMA Classic) — oxygenate → STOP AND THINK → wake up or intubate through SAD
Plan D — CICO — Emergency airway (age-based):
| Age | Technique |
|---|---|
| < 8 years | Wide-bore cannula cricothyroidotomy → jet ventilation (Manujet/50 mL syringe) |
| ≥ 8 years | Scalpel-bougie-tube (adult technique, smaller tube) |
5. AIDAA 2025 — Unanticipated Difficult Airway in Adults
Key innovations vs. DAS:
- No fixed hierarchy between rescue devices
- "Code D" as a formal hospital emergency code
- SpO₂ ≥95% gate before every attempt
- 6 consecutive capnography waveforms to confirm intubation
Algorithm
Primary Airway Plan (intubation / SGA / facemask / TIVA + O₂):
- Video laryngoscopy as first-line where available
- If successful → continue; if any difficulty → declare Code D immediately
Rescue Phase (no hierarchy — switch freely):
- Attempt Tracheal tube (TT) → SGA → Facemask in any order
- Max 3 attempts each
- Proceed to next attempt only if SpO₂ ≥ 95%
- Deliver nasal O₂ (HFNO preferred) throughout
- Track SpO₂ + elapsed time continuously
- Maintain depth of anaesthesia throughout
If SpO₂ drops / bradycardia develops at any point:
→ Bypass remaining steps → Emergency cricothyroidotomy immediately
Complete Ventilation Failure (all 3 devices fail):
→ Emergency cricothyroidotomy without further delay
Post-event: Airway alert form, patient communication, follow-up
6. AIDAA 2025 — Extubation of the "At-Risk" Airway
Framework: SAFE
| Step | Content | |
|---|---|---|
| S | Stratify Risk | Identify at-risk features: known difficult airway, airway oedema, obesity, OSA, prolonged intubation, neck surgery, cervical instability |
| A | Assemble & Anticipate | Gather equipment + experienced personnel; formulate written re-intubation plan; anticipate complications |
| F | Facilitate Extubation | Execute using appropriate limb/technique (see below) |
| E | Evaluate & Escalate | Monitor continuously post-extubation; escalate early; maintain O₂ (PerEOx) |
At-Risk Extubation — 3 Limbs
Limb 1 — Standard at-risk extubation:
- Full NMB reversal (quantitative TOF), co-operative patient, O₂ supplementation
Limb 2 — 3 Ds (for high-risk conditions):
- Difficult re-intubation expected
- Deteriorating airway (oedema, haematoma, bleeding)
- Dependency on tube (tracheomalacia, unstable cervical spine)
- → Use AEC or staged techniques
Limb 3 — 3 Ss (special strategies):
- Staged Sequential Extubation (SSE): remove ETT over AEC → step down to SAD → then remove SAD
- Supervised extubation in controlled environment (HDU/ICU)
- Stay intubated (delayed extubation) when airway is unsafe
Post-extubation for all at-risk:
- PerEOx (peri-extubation oxygenation) — continue O₂ throughout transfer
- Handover with explicit re-intubation plan
- Watch for: laryngospasm, bronchospasm, stridor, NPPE, aspiration, apnoea
EXAM MEMORY ANCHORS
| Algorithm | Memory Hook |
|---|---|
| DAS adult intubation | A-B-C-D (3 tries A, 2 tries B, 1 last C, scalpel D) |
| DAS extubation | Low vs. At-risk → AEC / Remi / SAD exchange |
| DAS obstetrics | RSI + max 2 attempts + Wake OR Proceed + eFONA |
| DAS paediatric | Spontaneous ventilation + needle (<8yr) vs. scalpel (≥8yr) |
| AIDAA intubation | Code D + no hierarchy + SpO₂ ≥95% gate + 3 each |
| AIDAA extubation | SAFE + 3 Ds + 3 Ss + SSE |
One-line rule that applies to ALL algorithms:
"Oxygenation takes priority over intubation at every step — if you cannot oxygenate, surgical airway without delay."
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The full exam-ready write-up is complete above. Here's how to use it efficiently:
For a short answer (5–10 marks):
Write the algorithm name → state the core concept → list Plans A→B→C→D with attempt limits → end with eFONA + post-event care. One paragraph per plan.
For a long answer (15–20 marks):
Add the comparison table, key differences (obstetric = max 2 attempts; pediatric = age-based FONA; AIDAA = Code D + no hierarchy), and the SAFE/3Ds/3Ss framework for extubation.
Highest-yield points examiners test:
- Max attempts: DAS adult = 3, DAS obstetric = 2, AIDAA = 3 each device
- CICO rescue: adults = scalpel-bougie, pediatric <8yr = cannula/needle
- AIDAA's unique terms: Code D, SpO₂ ≥95% gate, 6 capnography waveforms, no hierarchy
- AIDAA extubation mnemonic: SAFE + 3 Ds + 3 Ss + SSE
- Universal rule: oxygenation > intubation; surgical airway if CICO
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Difficult Airway Algorithms
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What's inside (8 sections, colour-coded):
- DAS 2015 Adult Intubation — Plans A→B→C→D with attempt limits, STOP AND THINK options, eFONA technique
- DAS Extubation — Low-risk vs. at-risk stratification, AEC/Remifentanil/SAD exchange techniques
- DAS/OAA Obstetrics — RSI, max 2 attempts, wake vs. proceed decision table, CICO
- DAS/APA Paediatrics — Age-based algorithms, FONA by age (<8yr needle vs. ≥8yr scalpel)
- AIDAA 2025 Intubation — Code D, no-hierarchy rescue, SpO₂ ≥95% gate, CVF trigger
- AIDAA 2025 Extubation — SAFE framework, 3 Ds, 3 Ss, Staged Sequential Extubation
- Master Comparison Table — All 6 algorithms side by side
- Exam Memory Anchors — 15 high-yield examiner-tested points + mnemonics
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