A supraglottic airway is in place, and ventilation is effective. Is that enough for the patient's ongoing care, or is a definitive airway needed?

As a military physician and instructor, this is the decision that interests me. The central situation here is an injured patient who still has a pulse. Consciousness may fluctuate, evacuation takes time, and the team must sustain its chosen strategy while recognising when it no longer meets the patient's needs.

Successful insertion, effective ventilation, protection from aspiration, and survival are different outcomes. Comparing supraglottic devices with intubation becomes useful when we identify the task, the expected duration of support, and the conditions in which care will continue. This is an educational discussion of clinical and training decisions, without drug regimens or procedural instructions.

What problem are we trying to solve?

Airway patency means that air can pass. Ventilation moves gas into and out of the lungs, including the elimination of carbon dioxide. Oxygenation concerns the transfer of oxygen into the blood. Aspiration protection limits the entry of foreign material into the airway. One intervention may contribute to several goals, but those goals remain distinct.

An open airway does not ensure adequate ventilation in someone with weak respiratory effort. Providing oxygen does not guarantee sufficient CO₂ clearance. Effective ventilation through a device does not establish that gastric contents cannot enter the trachea. Separating these objectives helps define what each intervention can and cannot achieve.

Supraglottic airway devices, or SGAs, provide a route for ventilation without passing a tube through the vocal cords into the trachea. Laryngeal mask airways belong to this group. The laryngeal tube has a different design, although it is also commonly grouped with SGAs. An endotracheal tube enters the trachea; bag-mask ventilation delivers breaths through a face mask. JTS describes these options separately, according to their capabilities.

Choosing between them requires assessment of respiratory effort, airflow, oxygenation, circulation, consciousness, and trends. Respiratory rate matters, but cannot establish breath depth or effective gas exchange by itself. Device insertion is likewise an intervention, not a measurement of its result.

It is also necessary to distinguish upper airway problems from other causes of impaired breathing. An airway device cannot reverse every consequence of chest injury or blood loss. If insertion does not produce the intended effect, the question must extend beyond which device to insert next: was the cause of deterioration correctly identified? In training, this discourages automatic escalation without reassessing the original problem.

The NAEMSP trauma airway position statement emphasises individualised, iterative assessment and adequate oxygenation and ventilation rather than a particular procedure. Its recommendations are used here only as reported in the authors' abstract. For instructors, this provides a useful starting point: assess how well the decision addresses the patient's problem.

When is an SGA reasonable, and why does the model matter?

An SGA can provide interim or rescue ventilation when basic measures are insufficient and intubation is unavailable, unsuccessful, or difficult to undertake immediately. JTS Airway Management in Trauma, dated 28 January 2026, retains this role. It does not make an SGA mandatory for every unconscious casualty.

Its practical value depends on the team's ability to achieve the required effect promptly. Familiarity with a particular device matters. However, a less complex insertion technique does not remove the need for patient selection, confirmation of ventilation, or recognition of failure.

Training must address the actual model available. The i-gel has a non-inflatable anatomical seal, with a gastric channel in adult models. Solus MRI-safe is a single-use laryngeal mask airway with an inflatable cuff. These features are described in the manufacturer's i-gel and Solus information sheets. They describe construction, not comparative clinical effectiveness in trauma.

Different seals require device-specific handling and checks according to the relevant instructions. An additional channel must be understood in terms of its intended function and compatibility. A gastric channel does not create a sealed tracheal airway or guarantee freedom from aspiration.

The MRI-safe designation concerns that model's properties in the magnetic resonance environment. It does not demonstrate superior ventilation or aspiration protection in trauma. Likewise, results obtained with a laryngeal tube cannot automatically be attributed to an i-gel or another laryngeal mask.

For me, the training question is whether learners understand the device they will actually use. Saying that a team “knows SGAs” can conceal important differences. Demonstrating those differences should support clinical reasoning rather than become a comparison of brands.

“Interim” also needs a clear purpose: reassessment, consultation, or transfer to a team with different capabilities. The term itself establishes no safe duration. The plan should identify the conditions under which support can continue and the response available if those conditions change.

When does the case for intubation become stronger?

An endotracheal tube with an appropriately positioned cuff provides a tracheal barrier that an SGA does not. The need for airway protection and prolonged active respiratory support strengthens the case for a definitive airway. JTS 2026 places this within broader planning for support and ongoing care.

However, “definitive” describes the airway, not freedom from risk or monitoring. Intubation requires a competent operator, confirmation of tube position, monitoring, medication when indicated, and a plan for failure. Equipment availability alone does not establish those conditions.

Having a pulse does not establish haemodynamic stability. A casualty in haemorrhagic shock may depend on compensatory mechanisms. Induction of anaesthesia and transition to positive-pressure ventilation can worsen haemodynamics. JTS emphasises resuscitation before intubation when the airway can be maintained during that period.

The physiological effects of positive pressure are not exclusive to endotracheal ventilation. They also matter during ventilation through an SGA or face mask. The NAEMSP statement on physiological optimisation addresses risks associated with procedures, medications, and conversion to positive pressure. Its recommendations on correcting hypoxaemia and hypotension are used here as presented in the authors' abstract.

This does not justify delaying essential airway management when an immediate threat cannot be controlled. Urgency, current support, procedural risk, and expected needs must be weighed together. Replacing an effective SGA with a tube is itself another intervention requiring preparation.

I think that discussion should explicitly identify both the expected benefit and the risk of transition. What should improve: protection, control of support, or provision for prolonged care? What can the team sustain before, during, and afterwards? This avoids changing a functioning device merely to use another, or retaining it solely because ventilation was initially achieved.

Severe traumatic obstruction may also require a surgical airway. A comparison of two devices must not restrict thinking to two options or distract from other immediate threats to life.

What changes as consciousness returns, and why distinguish the medications?

An SGA tolerated during profound unconsciousness may become poorly tolerated as protective reflexes return. JTS identifies limitations in conscious patients. Initial tolerance cannot be assumed to persist throughout evacuation.

Movement or agitation should not automatically be interpreted as a need for more sedation. Training should require reassessment: what has changed, is support still effective, and does the strategy fit the new situation? The answer must address the patient, not simply make retaining the device easier.

Vomiting is active expulsion of gastric contents; regurgitation is their passive return; aspiration is entry of material into the airway. No visible vomiting does not establish that regurgitation or aspiration has not occurred. Equal risks cannot be assumed across devices without relevant evidence.

A tracheal tube provides a better anatomical barrier, but aspiration can occur before placement or during the procedure. Similar overall aspiration rates in a trial do not establish equal protection after insertion. In AIRWAYS-2, the timing of events relative to airway management also mattered.

Sedation, analgesia, and neuromuscular blockade serve different purposes. Sedation alters alertness; analgesia addresses pain. Neuromuscular blockade can abolish spontaneous breathing without producing unconsciousness or analgesia. This danger is explicitly reflected in the official rocuronium prescribing information, including sections 5.1–5.4.

Requiring medication does not independently determine the device. It adds requirements for ventilation, monitoring, and continued care. The NAEMSP drug-assisted airway statement emphasises resources, training, medical oversight, and rescue options; these recommendations are available in its abstract. In teaching, the decision that support is necessary should be distinguished from how it will be delivered.

How do we establish that support remains effective?

After placement, assess the patient, device, and breathing system together. Chest movement, breath sounds, leakage, resistance during ventilation, consciousness, and haemodynamics provide different information. Monitoring complements clinical assessment rather than replacing it.

With an SGA, seal effectiveness is particularly important. With an endotracheal tube, tracheal placement must be confirmed and monitored. For either, asking whether ventilation is adequate now is more useful than accepting that the device is “in place.”

SpO₂ estimates haemoglobin oxygen saturation, not adequate CO₂ clearance. An acceptable value does not exclude inadequate ventilation. Pulse oximetry also has a response delay and signal limitations, including with poor peripheral perfusion, as described in JTS Appendix G. One number cannot describe the whole respiratory picture.

Capnography displays exhaled CO₂ as a waveform; EtCO₂ is the value at end-expiration. Waveform presence, shape, and trends help assess ventilation and detect problems. A capnogram does not measure protection against gastric contents or demonstrate the absence of aspiration.

CO₂ must also be delivered to the lungs by the circulation. EtCO₂ therefore depends on pulmonary perfusion as well as ventilation. A low value cannot automatically be labelled hyperventilation. As circulation deteriorates, EtCO₂ may fall and its relationship with arterial CO₂ may change. These limitations are described in section 7 of AARC Capnography/Capnometry During Mechanical Ventilation, 2011. This older guideline remains listed in AARC's official catalogue and is used here for measurement limitations.

The practical implication is to interpret waveforms and trends alongside ventilation, circulation, and system function. Sudden loss of a signal requires immediate assessment of the patient and equipment. Looking for a technical explanation must not delay responding to possible deterioration.

An unchanged value is also different from an unreliable measurement. If the oximetry signal is poor or the capnogram doubtful, describing the observations as “stable” may mislead. Records and handover should state which data were obtained, their reliability, and the other assessments available. Uncertainty must remain visible to the team rather than disappear behind a displayed number.

When precise arterial CO₂ measurement is clinically important, capnography does not replace a blood gas measurement. Conversely, lack of blood gas access does not make capnography unhelpful: clinicians must understand which questions it can answer.

What do movement, prolonged care, and handover change?

Transfers and transport challenge an initially successful intervention. Device displacement, traction on the circuit, or changes in the seal can impair ventilation. Effectiveness therefore needs reassessment after movement rather than reliance on pre-transfer findings. NAEMSP recommends reliable fixation and initial and ongoing confirmation using waveform capnography.

Prolonged care adds organisational demands. Who watches breathing, assesses changes, records observations, and maintains medication? How will ventilation continue if the primary equipment fails? Are suction, the necessary oxygen supply, power, and assistance available?

These questions apply to both strategies. A tube does not remove nursing and monitoring needs; an SGA does not remove planning requirements. JTS Appendix B addresses continued care. I think readiness for this stage should be discussed when the airway strategy is selected.

Handover should explain the reasoning. Useful information includes why the device was chosen, model and size, insertion time, attempts, confirmation, initial effect, and subsequent changes. Tolerance, suspected regurgitation or aspiration, medications and their most recent administration times, and current support needs also matter.

This is a suggested handover content, not a new universal form. It should fit existing documentation and the team's scope. The aim is to communicate why the strategy is considered effective and what remains unresolved. Missing observations should be identified rather than implying continuously confirmed stability.

Observation should also be separated from interpretation. “A leak appeared after transfer” and “the device may have moved” express different levels of certainty. Both are useful when clearly distinguished. With suspected aspiration, communicate what was seen and what changed without presenting an unconfirmed explanation as an established diagnosis.

What do AIRWAYS-2 and PART actually show?

AIRWAYS-2 compared initial i-gel and tracheal intubation strategies in adults with non-traumatic out-of-hospital cardiac arrest. It was cluster-randomised at paramedic level rather than individually by patient.

The primary outcome was modified Rankin Scale status at hospital discharge or day 30, whichever occurred first. A favourable outcome, scores 0–3, occurred in 6.4% with i-gel versus 6.8% with intubation. Superiority was not demonstrated; equivalence was not established.

Initial ventilation success was 87.4% versus 79.0%, respectively. This was a separate outcome, not first-attempt insertion success. Limitations included crossover and different proportions receiving advanced airway management. The comparison concerned strategies within a system, not just two objects.

PART compared an initial laryngeal tube, not i-gel, with intubation in out-of-hospital cardiac arrest. Its primary outcome was 72-hour survival: 18.3% versus 15.4%. Initial intubation strategy success was relatively low. In additional post hoc adjusted analysis, the survival difference was no longer statistically significant. That does not erase the primary result but warrants caution.

Neither trial directly answers the question for trauma patients with a pulse. Populations, resuscitation priorities, and circumstances differ. They do not establish equal vomiting risks as consciousness returns or a safe duration for continued SGA use.

For teaching, their important contribution is the distinction between technical success, ventilation, and patient outcomes. A better result at one stage cannot automatically establish a superior overall strategy in another population.

The percentages also cannot be compared across the two trials as a device ranking. Functional status at discharge or day 30 differs from survival at 72 hours. Systems, operators, and devices also differed. Interpretation rests on comparisons within each trial, not which trial reported the higher percentage.

Nor does the lack of a direct answer for trauma with a pulse prove that SGAs are ineffective. It defines uncertainty: decisions must draw on relevant trauma guidance, patient assessment, and team capabilities. Learners should hear that uncertainty rather than a categorical rule the trials did not test.

Why do guidelines give SGAs different roles?

The Airway Management section for Tactical Field Care in TCCC, 1 May 2026, does not include an SGA as a recommended step. This is not a universal prohibition throughout military medicine.

JTS 2026 has broader scope: trauma airway management in the operational environment, including prolonged care. It combines previous traumatic airway injury and prolonged field care guidance and retains an SGA role. Differences require attention to phase, training, and resources rather than an assumption of contradiction.

In cardiac arrest, ERC Adult ALS 2025 prefers i-gel to a laryngeal tube. This does not establish superiority over all other SGAs or intubation in trauma. AHA Adult ALS 2025 relates strategy to system capabilities, training, and intubation success.

Selecting convenient recommendations from different documents does not produce a universal algorithm. Guidance provides context; it does not automatically authorise every clinician to perform every procedure. Practice must match training and medical direction.

What should an instructor assess?

For me, a complete scenario should test the rationale, confirmation of effect, reassessment, recognition of failure, and a feasible next plan. Insertion technique remains important, but successful placement should not end the assessment.

A hypothetical training example, not a case from my practice: an injured patient has a pulse and impaired consciousness. Ventilation is confirmed after SGA placement. Following transfer, the capnogram changes and a leak appears. The learner must recognise this, assess the patient and system, and justify subsequent action within their training. Initial insertion alone should not earn a pass for the entire scenario.

In a variation, ventilation remains effective but protective reflexes return. Now tolerance, continuing support needs, and medication capabilities must be reconsidered. “The device still works” does not address all those questions.

I suggest assessing five elements:

  • Did the choice match the clinical problem and team capabilities?
  • How were ventilation, oxygenation, and trends confirmed?
  • Were changes after movement or altered consciousness recognised?
  • Were the strategy's limitations and possible failure identified?
  • Were the rescue plan and handover realistic?

Assessment depth differs for a non-medical learner and a clinician with advanced monitoring. It should test trained actions and timely requests for assistance within the learner's actual scope of practice. Debriefing should explain reasoning rather than reward a particular device regardless of context.

A manikin can test technique and responses to simulated changes; success does not demonstrate a strategy's clinical effectiveness. Training records should distinguish technical skill, interpretation of supplied data, and teamwork. Reducing these to “inserted correctly” obscures where further preparation is needed.

Conclusion: evaluate the strategy over time

An SGA can provide necessary interim or rescue ventilation. Intubation offers different capabilities for protection and prolonged support, alongside procedural and organisational demands. Neither establishes a universal winner for all injured patients with a pulse.

My position is that decisions should address current needs and the anticipated next stage. Anatomy, physiology, consciousness, aspiration risk, support duration, and team capability matter. A changing condition can change the justification for the initial choice.

Training should therefore include confirmation of effect and an appropriate response when it is lost. That is what makes the SGA–intubation discussion useful in practice.

What criteria does your team use to decide whether to continue ventilation through an SGA or move to a definitive airway?

References

Versions checked on 31 October 2026. The JTS catalogue lists the 28 January 2026 edition; TCCC was checked against the dated 1 May 2026 PDF and current Allogy page. JAMA methods, results, and limitations were accessible for both trials. The three NAEMSP statements are used only to the extent reported in their available author abstracts. Manufacturer information sheets support descriptions of construction, not comparative clinical effectiveness.

  1. Joint Trauma System. Airway Management in Trauma. 28 January 2026, CPG 39. JTS catalogue.
  2. CoTCCC. TCCC Guidelines, 01 May 2026. Official Allogy page.
  3. Benger JR, et al. Effect of a Strategy of a Supraglottic Airway Device vs Tracheal Intubation During Out-of-Hospital Cardiac Arrest on Functional Outcome: The AIRWAYS-2 Randomized Clinical Trial. JAMA. 2018;320(8):779–791. doi:10.1001/jama.2018.11597.
  4. Wang HE, et al. Effect of a Strategy of Initial Laryngeal Tube Insertion vs Endotracheal Intubation on 72-Hour Survival in Adults With Out-of-Hospital Cardiac Arrest. JAMA. 2018;320(8):769–778. doi:10.1001/jama.2018.7044.
  5. Soar J, et al. European Resuscitation Council Guidelines 2025: Adult Advanced Life Support. Resuscitation. 2025;215(Suppl 1):110769. doi:10.1016/j.resuscitation.2025.110769.
  6. Wigginton JG, et al. Part 9: Adult Advanced Life Support — 2025 AHA Guidelines. Circulation. 2025;152(Suppl 2):S538–S577. doi:10.1161/CIR.0000000000001376.
  7. Intersurgical. i-gel information sheet, Issue 17, June 2024.
  8. Intersurgical. Solus laryngeal mask airways information sheet, Issue 15.
  9. Walsh BK, Crotwell DN, Restrepo RD. AARC Clinical Practice Guideline: Capnography/Capnometry During Mechanical Ventilation: 2011. Respir Care. 2011;56(4):503–509. doi:10.4187/respcare.01175. AARC catalogue.
  10. NAEMSP. Prehospital Trauma Airway Management: Position Statement and Resource Document. Prehosp Emerg Care. 2022;26(Suppl 1):64–71. doi:10.1080/10903127.2021.1994069. Author abstract.
  11. Davis DP, et al. Optimizing Physiology During Prehospital Airway Management: An NAEMSP Position Statement and Resource Document. Prehosp Emerg Care. 2022;26(Suppl 1):72–79. doi:10.1080/10903127.2021.1992056. Author abstract.
  12. Jarvis JL, et al. Prehospital Drug Assisted Airway Management: An NAEMSP Position Statement and Resource Document. 2022. doi:10.1080/10903127.2021.1990447. Author abstract.
  13. DailyMed. Rocuronium bromide injection: prescribing information, sections 5.1–5.4.