Latest 2025 guidelines of DAS and AIDAA for difficult airway management

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difficult airway management guidelines

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DAS AIDAA difficult airway management guidelines 2025

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PMID: 41203471

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PMID: 41293142

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https://pmc.ncbi.nlm.nih.gov/articles/PMC12643155

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difficult airway management algorithm flowchart intubation

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DAS 2025 and AIDAA 2025 Guidelines for Difficult Airway Management

Both societies published landmark updated guidelines in 2025, each representing their most significant revision in nearly a decade. They share core philosophies but differ in structure and some specific recommendations.

DAS 2025 Guidelines (Difficult Airway Society, UK)

Full citation: Ahmad I, El-Boghdadly K, Iliff H, et al. Difficult Airway Society 2025 guidelines for management of unanticipated difficult tracheal intubation in adults. Br J Anaesth. 2026. PMID: 41203471

Development Process

12 guideline group members met over 65 meetings across 3 years
Systematic review of 1,241 papers
Three-round Delphi process
20 external emergency front-of-neck airway (eFONA) experts consulted
16 international airway experts provided feedback
65 total recommendations produced

Core Philosophy Shift

The 2015 DAS guidelines were built around "what to do when things fail." The 2025 update reframes the entire approach: maximize the chance of success on the first attempt, rather than plan for failure. The framework (Plans A-D) is retained, but the philosophy is fundamentally changed.

Algorithm Structure (Plans A-D) - Retained and Refined

Plan	Device/Action	Key 2025 Update
A	Tracheal intubation	VL as primary; limit to 3 attempts; physiologic optimization before attempt
B	Supraglottic airway (SGA) device	Reframed as strategic oxygenation pause, not just rescue
C	Face-mask ventilation	"Buying time" - continuous oxygen, not a sign of failure
D	Emergency front-of-neck airway (eFONA)	Act early; delay is the main predictor of poor outcome

Key New Recommendations

1. Physiologically Difficult Airway (NEW) For the first time, DAS formally addresses the critically ill patient - those who are hypoxemic, acidotic, or hypotensive. The difficulty is no longer just anatomical ("can I get the tube in?") but also physiological ("will this patient tolerate the attempt?"). Pre-intubation optimization may include vasopressors, HFNO, and awake intubation consideration.

2. Preoxygenation and Continuous Oxygenation Uninterrupted oxygen delivery is established as the central organizing principle throughout all plans. HFNO during apnea (apnoeic oxygenation) is now formally recommended to extend safe apnoea time.

3. Videolaryngoscopy (VL) VL is recommended as the primary device for tracheal intubation, reflecting its now near-universal availability and superior first-pass success rates.

4. Waveform Capnography Mandatory for confirmation of tracheal tube placement; both the operator and assistant should verbalize sustained exhaled CO2 and adequate SpO2.

5. Human Factors - Central, Not Appendix Shared mental models, leadership, stop-and-think prompts, and structured communication are built into every plan. Cognitive performance under pressure is explicitly addressed - a major cultural departure from 2015.

6. eFONA - Act Early Plan D (eFONA/cricothyroidotomy) is reframed as a time-critical oxygenation intervention, not a last resort. The guidelines directly address "eFONA hesitation" and state that delay is the main predictor of poor outcome. Surgical cricothyroidotomy is preferred over needle technique.

7. "Wake Up" Is Not Always an Option In physiologically difficult airways (critically ill, cannot tolerate delay), waking the patient may not be feasible. The guidelines explicitly acknowledge this.

8. Obesity A dedicated section for obese patients, including ramped positioning, HFNO, and adjusted algorithm thresholds.

9. Rapid Sequence Induction and Intubation (RSII) Updated recommendations including modified RSII, role of VL, and opioid use.

10. Institutional Accountability Simulation, debriefing, and airway governance are now defined as organizational duties - not just individual ones. Airway registries and documentation standards are specified.

AIDAA 2025 Guidelines (All India Difficult Airway Association)

Full citation: Myatra SN, Shah AP, Ramkumar V, et al. All India Difficult Airway Association 2025 guidelines for the management of unanticipated difficult airway in adults under general anaesthesia. Indian J Anaesth. 2025. PMID: 41293142 | PMC Full Text

Development Process

AHA Class of Recommendation + Level of Evidence grading system
Delphi process for areas with absent or weak evidence
Multiple research questions addressed with structured evidence review

Core Philosophy Shift vs. 2016 AIDAA Guidelines

The 2016 AIDAA guidelines focused narrowly on failed intubation. The 2025 update expands scope to address failure of any primary airway strategy: failed SGA insertion, failed face-mask ventilation, or failure of any other primary plan component.

Key New Recommendations

1. "Code D" - Hospital Emergency Code (NEW) A formally proposed hospital emergency code - "Code D" - to be activated when a patient has a difficult airway and immediate multidisciplinary assistance is required. Analogous to "Code Blue" for cardiac arrest.

2. Circular (Non-Hierarchical) Rescue Algorithm (NEW) The 2016 guidelines used a linear approach. The 2025 guidelines adopt a circular pattern for airway rescue: the three devices (tracheal tube, SGA, face mask) are interchangeable with no fixed hierarchy. Providers switch promptly between them to achieve effective ventilation and oxygenation.

3. Airway Assessment - Anatomical AND Physiological Routine airway assessment must now identify both anatomical and physiologically difficult airways, mirroring the DAS shift.

4. Peri-intubation Oxygenation

Pre-oxygenation is emphasized
Apnoeic oxygenation: nasal oxygen at 10-15 L/min extends safe apnoea time
HFNO is an option and further extends safe apnoea time

5. Videolaryngoscopy VL (with stylets/bougies as adjuncts) recommended to improve first-pass intubation success. Level of Evidence: A, Class of Recommendation: I.

6. Waveform Capnography Tracheal tube position must be confirmed with waveform capnography. Both operator and assistant must verbalize sustained exhaled CO2 AND adequate SpO2. Oesophageal intubation must be actively ruled out - clinical examination alone is not sufficient.

7. Attempt Limits Maximum of up to 3 failed attempts with each device (tracheal tube, SGA, face mask), provided SpO2 remains ≥95%. Nasal oxygen must be continued throughout; time elapsed must be tracked.

8. Surgical Cricothyroidotomy as Preferred eFONA Technique (Updated)

Trigger for cricothyroidotomy: "Complete ventilation failure" = tracheal tube, SGA, AND face mask have all failed (even if oxygenation is momentarily maintained)
In 2016, needle or surgical cricothyroidotomy was acceptable based on familiarity
In 2025, surgical cricothyroidotomy is the preferred technique (expert consensus)
Rationale: universal availability of stab knife, bougie, and size 6 tracheal tube

9. Post-event Care

Team debriefing and team support
Patient and family counselling
Detailed documentation are all explicitly stated as paramount

Side-by-Side Comparison: DAS 2025 vs. AIDAA 2025

Feature	DAS 2025	AIDAA 2025
Algorithm structure	Linear Plans A-B-C-D (retained)	Circular/non-hierarchical rescue (new)
Scope	Unanticipated difficult tracheal intubation	Unanticipated difficult airway (any primary plan failure)
Emergency code	Not specified	"Code D" (new, formal)
Physiologically difficult airway	Formally addressed for first time	Formally addressed for first time
Preoxygenation/apnoeic O2	HFNO standard; continuous O2 central principle	Nasal O2 10-15 L/min or HFNO
VL recommendation	Primary device	Primary device (Class I, Level A)
eFONA trigger	True CICO (cannot intubate, cannot oxygenate)	Complete ventilation failure (TT + SGA + FM all failed)
Preferred cricothyroidotomy	Surgical	Surgical (expert consensus)
Waveform capnography	Mandatory	Mandatory (both operator + assistant verbalize)
Max attempts	Limit attempts; no fixed number per plan	Up to 3 failed attempts per device if SpO2 ≥95%
Human factors	Central to entire document	Debriefing and team support post-event
Institutional duty	Simulation, airway governance, registries	Documentation, counselling

Key Shared Themes Across Both 2025 Guidelines

Optimize for first-attempt success rather than planning reactively for failure
Physiologically difficult airway is now a distinct, formally recognized entity
VL is the primary intubation tool in adults
Waveform capnography is non-negotiable for tube confirmation
Surgical cricothyroidotomy is preferred over needle technique for eFONA
Continuous/peri-intubation oxygenation (apnoeic O2, HFNO) is standard
Early escalation - act before oxygenation failure occurs, not after
Post-event responsibilities (debriefing, documentation, patient communication) are formalized

The DAS 2025 paper (PMID 41203471) is published in the British Journal of Anaesthesia and the AIDAA 2025 paper (PMID 41293142) is open-access in the Indian Journal of Anaesthesia with full text available via PMC. A supporting systematic review on the evidence base underlying current difficult airway guidelines was also published in 2025 (PMID 40318848).

Image of both

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DAS 2025 difficult airway algorithm image Plan A B C D flowchart

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AIDAA 2025 difficult airway algorithm image Code D circular flowchart India

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Here are the official algorithm images from both the DAS 2025 and AIDAA 2025 guidelines:

DAS 2025 - Main Algorithm: Management of Unanticipated Difficult Tracheal Intubation

The linear Plans A-D framework is retained. Note the "OXYGENATE" sidebar running vertically - continuous oxygenation is the central principle throughout all plans. "Stop, Think and Communicate" boxes appear at Plan B and C transition points.

DAS 2025 - Preparation and Planning for Tracheal Intubation

DAS 2025 Preparation and Planning Flowchart

This is the pre-intubation planning figure: airway assessment leads to a decision on whether AWI (Awake Tracheal Intubation) is appropriate, or whether to proceed to asleep intubation with a full preparation checklist (Plans A-D equipment, waveform capnography, preoxygenation strategy).

AIDAA 2025 - Management of Unanticipated Difficult Airway in Obstetrics

AIDAA 2025 Obstetric Difficult Airway Algorithm

This shows the AIDAA circular design - the three devices (tracheal tube, SGA, face mask) form a non-hierarchical loop. "Code D" call for help runs along the left side. Complete Ventilation Failure triggers Emergency Surgical Cricothyroidotomy at the bottom.

AIDAA 2025 - Extubation of the "At-Risk" Airway

Bonus: AIDAA 2025 also published companion guidelines for extubation of the at-risk airway, shown here - covering the 3 Ds (Difficulty, Delayed recovery, Difficult FMV/intubation) and 3 Ss (Suspected collapse, oedema, surgical cause), with pathways to awake extubation, staged sequential extubation, or delayed extubation in HDU/ICU.

Key visual difference: DAS uses a vertical linear cascade (A → B → C → D), while AIDAA uses a circular loop with three interchangeable devices and no fixed hierarchy - reflecting their fundamentally different rescue philosophies.

Aidaa and das 2016 difficult airway image

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DAS 2015 difficult airway algorithm image Plan A B C D unanticipated difficult intubation

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AIDAA 2016 difficult airway algorithm image unanticipated difficult intubation India

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AIDAA 2016 adult unanticipated difficult tracheal intubation algorithm figure 1 PMC5168891

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Here are all the images I was able to retrieve. The AIDAA 2016 adult algorithm image is not directly fetchable from external sources (PMC blocks direct hotlinking for older articles), but I have the obstetrics version which shares the same stepwise structure, plus the DAS 2015 overview in full clarity.

DAS 2015 - Difficult Intubation Guidelines Overview

The classic linear Plans A-D: Plan A = Facemask ventilation + laryngoscopy → tracheal intubation. Plan B = SAD insertion (with "Stop and Think" options: wake up / intubate via SAD / proceed / tracheostomy). Plan C = Final facemask attempt → wake up if successful. Plan D = CICO → Cricothyroidotomy.

AIDAA 2016 - Unanticipated Difficult Tracheal Intubation in Adults (Linear Stepwise Algorithm)

The direct image file for the 2016 adult algorithm is not accessible via hotlink, but the structure is identical to this obstetrics version (same 4-step linear format):

AIDAA 2016 Adult Algorithm - Obstetrics version (same structure)

AIDAA 2016 Adult Algorithm Steps:

Step 1: Laryngoscopy and tracheal intubation (nasal O2 15 L/min; max 2 attempts if SpO2 ≥95%; confirm with capnography)

Step 2: Insert SAD to maintain oxygenation (2nd gen preferred; max 2 attempts if SpO2 ≥95%)

Step 3: Rescue face-mask ventilation (ensure NMB; optimal technique + adjuncts)

Step 4 (Complete Ventilation Failure): Emergency cricothyroidotomy (surgical / wide-bore cannula / needle - based on familiarity)

Running left sidebar: "CALL FOR HELP" at every step

Nasal O2 insufflation at 15 L/min throughout all steps

You can view and download the original AIDAA 2016 adult algorithm directly from the AIDAA official algorithms page.

Quick Side-by-Side: 2015/2016 vs 2025

Feature	DAS 2015	AIDAA 2016	DAS 2025	AIDAA 2025
Structure	Linear A-D	Linear 4 steps	Linear A-D (retained)	Circular (no hierarchy)
Scope	Failed intubation	Failed intubation	Failed intubation	Any failed primary plan
Emergency code	None	None	None	"Code D"
Preferred eFONA	Any cricothyroidotomy	Any technique	Surgical	Surgical
VL	Optional	Optional	Primary device	Primary device
Physiologic DA	Not addressed	Not addressed	Formally addressed	Formally addressed
HFNO/apnoeic O2	Not standard	15 L/min nasal O2	HFNO standard	10-15 L/min or HFNO

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