Oropharyngeal Airway Insertion: Guedel Sizing & Safe Placement
When a patient is unconscious without a gag, the tongue often blocks the pharynx and bag-mask ventilations fail. This guide covers how to perform oropharyngeal airway insertion: measure from mouth to mandible, suction first, rotate-and-advance technique, pair with BVM ventilation, and know when an OPA is the wrong tool.
On this page
Quick facts
Key takeaway
An OPA is for the unconscious patient without a gag—not the snoring but rousable patient. Suction the mouth first, size to the mandible, insert with control, confirm chest rise, and remove the adjunct the moment the patient gags or wakes.
Procedure summary
| Field | Details |
|---|---|
| Procedure name | Oropharyngeal airway insertion |
| Also known as | OPA insertion; Guedel airway placement; oral airway |
| Category | Emergency airway adjunct / basic airway management |
| Clinical purpose | Maintain a patent oropharyngeal passage in an unconscious patient without a gag reflex so ventilation and oxygenation can continue during manual ventilation or resuscitation support. |
| Who performs | Registered nurses and credentialed clinicians trained in basic airway management; students under direct supervision. Scope and delegation vary by jurisdiction and employer. |
| Typical settings | Emergency departments, wards during deterioration, peri-arrest, post–foreign-body relief when unconscious, and simulation training. |
| Time | Usually under one minute once equipment is ready; reassessment continues after placement. |
What is oropharyngeal airway insertion?
An oropharyngeal airway (OPA)—often called a Guedel airway—is a curved plastic adjunct that sits in the mouth and holds the tongue forward so it does not occlude the posterior pharynx. Nurses insert OPAs when a patient is unconscious and not protecting the airway with an effective gag, typically to support bag-valve-mask ventilation or to bridge care until a definitive airway team arrives.
It is a temporary measure, not a substitute for suction, positioning, reversal of reversible causes, or advanced airway management. Pair every insertion with a focused respiratory assessment, pulse oximetry, and escalation when work of breathing or mental status does not improve.
OPA vs nasopharyngeal airway: which adjunct fits?
Choosing the wrong adjunct wastes seconds and can worsen vomiting or laryngospasm. Use mental status and gag response as your first branch—not habit.
Unconscious without gag
Conscious or gagging
- Patient is conscious or likely to gag—OPA insertion commonly triggers vomiting and worsens obstruction.
- Trismus, blood or vomitus filling the mouth that you cannot clear with airway suctioning first.
- Suspected basal skull fracture or mid-face instability until specialist advice—institutional protocols may vary; many teams prefer nasopharyngeal routes or advanced airways instead.
Clinical indications
- Unconscious patient with ineffective airway maintenance despite head positioning and jaw support.
- Need for assisted ventilation with BVM when oral patency cannot be sustained by hand positioning alone.
- Bridge after relief of obstruction when the patient remains unresponsive—for example following severe choking management and transition to CPR care.
- Peri-arrest or resuscitation support while advanced airway resources are summoned—always within your trained algorithm.
- Suspected reversible depression of consciousness (for example opioid toxicity) where ventilation support is required alongside naloxone per orders.
Contraindications and cautions
- Conscious or semiconscious patients with intact gag—risk of vomiting, laryngospasm, and complete obstruction.
- Obvious oral trauma, unstable mid-face injury, or bleeding you cannot control—seek senior or anaesthesia input.
- When the priority is definitive airway (for example ongoing stridor suggesting upper-airway oedema) rather than repeated adjunct trials.
- Seizure activity or post-ictal clenching—protect the patient and time insertion with team control of movements.
- Cervical spine concern—maintain manual inline stabilisation if trained; jaw thrust may be preferred over excessive head extension per trauma protocol.
- Paediatric patients—use paediatric-sized adjuncts and paediatric BLS pathways; adult OPAs are not interchangeable. Institutional protocols may vary.
Sizing before you open the packet
Incorrect length drives gagging (too long), inadequate tongue lift (too short), or lip trauma. Measure before gloving up when possible.
| Step | How to size | Bedside check |
|---|---|---|
| Length | Place the airway beside the face: from the corner of the mouth to the angle of the mandible (some services use incisor to angle of jaw). | Flange should sit at the lips without the tip projecting beyond the mandible. |
| Colour coding | Manufacturers label sizes (for example 000–5); match the measured length to the kit label. | When between sizes, follow local teaching—many teams choose the smaller airway if uncertain in adults. |
| After insertion | Reassess lip colour, chest rise with ventilation, and resistance on bagging. | Remove and resize if gagging returns, inadequate rise, or trauma to lips or teeth. |
Equipment checklist
Patient preparation
- Verify identity; confirm the patient is unconscious and that gag reflex is absent per your assessment method.
- Position supine on a firm surface; align head and neck unless trauma protocol requires manual inline stabilisation and jaw thrust only.
- Open the mouth—remove dentures if loose; suction blood, vomitus, or secretions before inserting the adjunct.
- Select and lubricate the airway; have a smaller and larger size available at the bedside.
- Assign roles: one person maintains airway and ventilates, another inserts adjunct, a third calls for help if not already done.
Step-by-step insertion
Technique wording varies by training programme. The sequence below reflects commonly taught rotate-and-advance insertion aligned with UK and international basic airway teaching. Institutional protocols may vary—follow your competency sign-off.
Airway preparationHand hygiene and PPE
Perform hand hygiene; don gloves and eye protection. Standard precautions apply—assume oropharyngeal secretions are infectious.
Clear the mouth
Suction visible secretions, blood, or debris. Remove only visible foreign material; do not perform blind finger sweeps in a patient who may regain consciousness.
Open the airway manually
Apply head-tilt chin-lift or jaw thrust per trauma status. Confirm whether chest movement improves with bag-mask trial before adjunct insertion when time allows.
Insert with controlled rotation
Holding the airway at the flange, insert upside down (concavity toward the hard palate) along the tongue until resistance at the posterior pharynx, then rotate 180° and advance until the flange rests against the lips. Some programmes teach direct insertion following the tongue curve—use the method you were certified to perform.
Confirm placement
Flange should be external at the lips without teeth biting the tube. Reassess: bilateral chest rise, improving colour, audible ventilation without gross leak, and falling resistance on the bag.
Ventilate and monitor
Deliver ventilations per BLS or resuscitation protocol. Continuously watch for vomiting, coughing, or return of gag—remove the OPA immediately if the patient gags or regains consciousness.
Integrating the OPA with bag-mask ventilation
The OPA keeps the tongue off the posterior wall so the mask seal and ventilations are more effective. Use a two-person technique when possible: one rescuer holds a two-handed mask seal with jaw thrust, the second squeezes the bag at the prescribed rate. If chest rise remains poor, reassess mask size, seal, airway depth, and whether obstruction is supraglottic rather than tongue-related.
Two failed optimisation cycles with persistent apnoea, falling SpO2, or worsening consciousness should trigger senior emergency review and consideration of supraglottic or intubation pathways per local policy—not repeated OPA changes alone.
Post-insertion care and removal
- Reassess airway, breathing, and circulation at least every few minutes during resuscitation; otherwise per observation protocol.
- Remove the OPA as soon as the patient regains consciousness or gags—have suction ready.
- Inspect lips, teeth, and palate for pressure injury after removal.
- Prepare for advanced airway if vomiting recurs, secretions overwhelm suction, or oxygenation does not improve.
Nursing documentation
“21/05/2026 03:12 — Found unresponsive (GCS E1 V1 M3). Gag absent. Mouth suctioned; size 4 OPA inserted with lubricant using rotate technique; flange at lips. BVM ventilation with O2; improved chest rise, SpO2 88% → 94%. Emergency team called. Will remove OPA if consciousness returns.”
- Indication, size, lubrication, insertion technique category, and who performed the skill.
- Pre- and post-insertion observations: SpO2, respiratory rate, chest rise, colour, and effect on ventilation.
- Time of removal or change of size; complications (vomit, lip trauma, desaturation).
- Handover to emergency team including whether BVM was effective after insertion.
Complications
- Vomiting and aspiration—especially if inserted in a patient with preserved gag; prevention is correct patient selection.
- Too deep or too shallow placement—causing cough, inadequate ventilation, or lip or dental trauma.
- Laryngospasm or worsening obstruction—stop and reassess; prepare advanced airway support.
- Soft-tissue injury to lips, gums, or palate from forced insertion without lubrication or sizing.
When to escalate
- Persistent inability to ventilate despite correct OPA size and two-rescuer mask seal.
- Return of gag with vomiting—remove adjunct, lateral recovery position if conscious enough and no spinal precautions, suction, and call for help.
- Suspected stroke, seizure, or toxic ingestion where definitive airway and imaging are needed.
- Agonal respirations, falling SpO2, or arrest—activate resuscitation team and follow adult BLS.
Clinical pearls
- Gag means stop: if you are unsure whether the patient will gag, reassess consciousness with level of consciousness tools before opening the packet.
- Suction first: an OPA does not clear vomitus—it only holds space; clearing the mouth wins obstructed airways.
- Re-measure after repositioning: head movement changes apparent length; confirm flange position after rolling or transfer.
- Document size and response: “OPA inserted” without size or ventilation effect is poor handover data for the arriving team.
Clinical Judgment Practice
NCLEX-style clinical judgment practice — Unconscious patients without a gag reflex need the right adjunct before bagging fails—rehearse sizing, insertion priority, select-all-that-apply cue recognition, post-OPA trend interpretation, matrix escalation, and documentation cloze for oropharyngeal airway insertion (recognise cues → analyse → prioritise → act → evaluate outcomes).
Unfolding case — medical ward, night shift. Mr. Okello, 58, is found unresponsive in bed after a witnessed tonic-clonic episode ends. He is not responding to voice. Secretions pool in the mouth; SpO2 82% on room air, respiratory rate 6, no chest rise. The crash trolley is en route. You are credentialed for basic airway adjuncts.
Answer key & rationale
Frequently asked questions
Can you use an OPA in a conscious patient?
No. A conscious or semiconscious patient with an intact gag is likely to vomit or laryngospasm. Use positioning, treat the cause, and escalate rather than forcing an oral adjunct.
How do you measure the correct OPA size?
Measure from the corner of the mouth to the angle of the mandible (or follow your local teaching for incisor-to-angle measurement). The flange should rest at the lips without the tip projecting beyond the jaw.
Should the airway be inserted upside down?
Many programmes teach insertion concavity-up along the palate, rotation at the pharynx, then advancement until the flange sits at the lips. Follow the technique you were certified to use.
When should the OPA be removed?
Remove it as soon as the patient gags, vomits, or regains consciousness. Have suction ready and reassess whether a different airway plan is needed.
Does an OPA replace suction or CPR?
No. Clear the mouth, ventilate effectively, and start CPR when indicated. The OPA only maintains space in the oropharynx during assisted breathing.
Is an OPA the same as intubation?
No. It is a basic adjunct for temporary patency. Definitive airways require additional training, equipment, and medical oversight.
References
- Royal Marsden Manual of Clinical Nursing Procedures — Insertion of an oropharyngeal airway (RMM Online).https://www.rmmonline.co.uk/manual/c12-fea-0025
- Royal Marsden Manual — Procedures hub (general nursing procedure library).https://www.rmmonline.co.uk/contents/procedures
- Merck Manual Professional Edition. How To Insert an Oropharyngeal Airway.https://www.merckmanuals.com/professional/critical-care-medicine/how-to-do-basic-airway-procedures/how-to-insert-an-oropharyngeal-airway
- Resuscitation Council UK. Adult basic life support and airway management guidance.https://www.resus.org.uk/library/2025-resuscitation-guidelines/adult-basic-and-advanced-life-support
- American Heart Association. 2025 CPR & ECC Guidelines — Adult Basic Life Support.https://cpr.heart.org/en/resuscitation-science/cpr-and-ecc-guidelines/adult-basic-life-support
- RCEM Learning. The oropharyngeal airway (basic airway adjuncts module).https://www.rcemlearning.co.uk/modules/basic-airway-management/lessons/simple-airway-adjuncts/topic/the-oropharyngeal-airway/
- OpenStax. Clinical Nursing Skills — emergency and airway-related nursing fundamentals.https://openstax.org/details/books/clinical-nursing-skills
Editorial standards & medical review
About the author: Sid A. Abdala Balal, RN, writes evidence-based nursing education focused on practical bedside skills, patient safety, and clinical decision support for nurses.
Medical review: This guide is reviewed by Dr. Adam Sayedi, MD, for clinical accuracy, clarity, and alignment with current basic airway management and resuscitation guidance.
Policies: Medical Review Process · Editorial Policy · Correction Policy