Airway Management in the Field Setting

Airway Management in the Field Setting

Airway management is the most time-critical skill in prehospital care. Without a patent airway and adequate ventilation, every other intervention is futile. In the field, you must rapidly assess the airway, select the right intervention for the patient's condition and your scope of practice, and perform it correctly — the first time.

Assessment Before Intervention

Before touching any equipment, look, listen, and feel. Is the patient conscious and protecting their own airway? Is chest rise visible? Are there abnormal sounds — stridor, gurgling, snoring — that signal obstruction? A patient who is unconscious, has absent or inadequate breathing, or cannot maintain their own airway requires immediate action.

Position matters first. For a medical patient with no trauma concern, use the head-tilt/chin-lift to open the airway. For any patient with suspected spinal injury, use the jaw thrust instead — it opens the airway without extending the neck. These are foundational, low-risk maneuvers that cost nothing to perform.

Airway Adjuncts: OPA and NPA

An oropharyngeal airway (OPA) holds the tongue away from the posterior pharynx. It is used only in unconscious patients without a gag reflex — inserting one in a patient with an intact gag reflex will cause vomiting and possible aspiration. Size the OPA by measuring from the corner of the mouth to the earlobe.

A nasopharyngeal airway (NPA) is better tolerated in patients with a reduced level of consciousness who still have some gag reflex. Contraindications include suspected basilar skull fracture (signs: Battle's sign, raccoon eyes, CSF from ears or nose) and severe facial trauma to the nasal passage. Lubricate the NPA before insertion. Size by measuring from the tip of the nose to the earlobe.

Bag-Valve-Mask Ventilation

BVM ventilation is the workhorse of prehospital airway support and must be mastered by every EMT and paramedic. Two-person technique is preferred whenever a second rescuer is available: one provider creates a two-handed mask seal using the E-C clamp grip while the second squeezes the bag.

• Adult rate: approximately 10–12 breaths per minute for the apneic adult; 8–10 breaths per minute in cardiac arrest to avoid hyperventilation
• Pediatric rate: approximately 12–20 breaths per minute depending on age
• Tidal volume: deliver enough to produce visible, gentle chest rise — roughly 500–600 mL in an average adult; avoid over-ventilation, which causes gastric inflation and reduced venous return
• Oxygen: connect to 15 L/min supplemental oxygen to achieve high FiO2

Capnography confirms ventilation. A normal waveform capnography (ETCO2) reading during BVM ventilation should show a consistent rectangular waveform. Target ETCO2 is generally 35–45 mmHg in non-arrest patients. Absence of a waveform during BVM with a good mask seal raises concern for severe airflow obstruction or equipment failure.

Supraglottic Airways

Supraglottic airways (SGAs) such as the King LT or laryngeal mask airway (LMA) are inserted without visualizing the vocal cords. They are faster to place than an endotracheal tube and do not require laryngoscopy. SGAs are appropriate for unconscious, apneic patients when endotracheal intubation is not immediately achievable or is outside scope of practice.

Insert the device according to manufacturer instructions, inflate the cuff with the recommended volume of air, ventilate, and immediately confirm placement with waveform capnography and bilateral chest rise. SGAs do not fully protect against aspiration, but they establish a functional airway rapidly.

Endotracheal Intubation (Paramedic Level)

Endotracheal intubation (ETI) provides the most definitive airway available in the prehospital setting. It is within the paramedic scope of practice, not the EMT scope. The sequence:

1. Pre-oxygenate the patient with high-flow oxygen via BVM for at least 30 seconds when possible.

2. Position the patient — sniffing position aligns airway axes for direct laryngoscopy.

3. Insert the laryngoscope blade into the mouth, displace the tongue to the left, and visualize the glottis.

4. Pass the ET tube through the cords under direct vision; note the centimeter marking at the teeth (typically 21–23 cm for an average adult).

5. Remove the laryngoscope and inflate the cuff with the syringe.

6. Immediately confirm with waveform capnography (primary method), bilateral breath sounds, absence of epigastric sounds, and chest rise.

7. Secure the tube with tape or a commercial tube holder and document tube size, depth at teeth, number of attempts, and time to successful placement.

Critical safety rule: Unrecognized esophageal intubation is fatal. If waveform capnography shows a flat line, the tube is not in the trachea — remove it immediately, ventilate with BVM, and reattempt. Video laryngoscopy improves glottic visualization, particularly in patients with difficult airways, obesity, or blood and secretions in the airway.

Limit interruptions: Each intubation attempt should take no longer than approximately 30 seconds. If the first attempt fails, return to BVM ventilation before the next attempt.

Pediatric Considerations

Children have proportionally larger tongues, a more anterior and cephalad larynx, and a narrower airway. Use appropriately sized equipment — incorrect sizing is a leading cause of pediatric airway failure. Length-based resuscitation tapes (such as the Broselow tape) help estimate correct equipment sizes and drug doses. Uncuffed ET tubes are commonly used in young children; always follow current resuscitation guidelines and medical direction.

Documentation and Scope of Practice

Document every airway intervention: the technique used, the number of attempts, confirmation method, and time. If you perform an intervention outside your certification level without medical direction, you place the patient and your certification at risk. When in doubt, ventilate with BVM and contact medical direction.