11.1 Basic Airway Maneuvers, Positioning, OPA/NPA & Suctioning Techniques

11.1 Basic Airway Maneuvers, Positioning, OPA/NPA & Suctioning Techniques

Functional Anatomy & Pathophysiology of Upper Airway Obstruction

Airway management is the foundational core of emergency medical care. Under the Canadian Paramedic Competence Framework (CPCF Appendix A #21), the Primary Care Paramedic (PCP) must demonstrate mastery in identifying airway compromise, executing manual positioning maneuvers, selecting and placing basic airway adjuncts, and performing effective airway clearance. The human airway is divided into upper and lower tracts at the level of the true vocal cords (glottic opening). The upper airway comprises the nasopharynx, oropharynx, and laryngopharynx (hypopharynx), functioning to warm, filter, and humidify incoming air before it reaches the larynx, trachea, and bronchial tree.

In healthy, alert individuals, continuous tone in the genioglossus, geniohyoid, and pharyngeal constrictor muscles maintains upper airway patency. However, in patients with a depressed level of consciousness (Glasgow Coma Scale [GCS] score ≤ 8)—secondary to traumatic brain injury, intoxicants, hypoxia, hypoglycemia, or post-cardiac arrest encephalopathy—muscular hypotonicity allows the base of the tongue and the epiglottis to fall backward against the posterior pharyngeal wall. This gravitational and mechanical collapse represents the single most common cause of upper airway obstruction in the supine, unresponsive patient.

Clinical Presentation of Airway Obstruction

Paramedics must rapidly distinguish between partial and complete upper airway obstruction:

• Snoring (Sonorous Respirations): Caused by the vibration of relaxed soft tissues in the oropharynx, primarily the tongue base and soft palate. This indicates partial obstruction and is immediately remediable by manual positioning or basic adjuncts.
• Gurgling: Produced by air bubbling through pooled liquids (blood, vomitus, pulmonary edema fluid, or excessive salivary secretions) in the hypopharynx. Gurgling demands immediate manual clearance and mechanical suctioning.
• Stridor: A harsh, high-pitched, predominantly inspiratory sound originating from the larynx or upper trachea. It signifies critical anatomical narrowing of the upper airway resulting from laryngeal edema (e.g., anaphylaxis, epiglottitis, croup) or an impacted foreign body.
• Complete Airway Obstruction: Characterized by total silence, absence of air movement at the mouth and nose despite extreme respiratory effort, intercostal and supraclavicular retractions, and paradoxical "see-saw" chest-abdominal motion. Without rapid intervention, asphyxial cardiac arrest ensues within minutes.

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Manual Airway Opening Maneuvers & Patient Positioning

Before equipment is selected, the paramedic's immediate initial intervention for an obstructed or threatened airway must be manual positioning.

1. Head-Tilt Chin-Lift Maneuver

• Indications: Unresponsive medical patients with suspected upper airway obstruction where there is no suspicion of cervical spine injury.
• Technique: Place one hand on the patient's forehead and apply firm backward pressure with the palm to tilt the head into extension at the atlanto-occipital joint. Concurrently, place the index and middle fingertips of the opposite hand beneath the bony part of the chin (mandibular symphysis) and lift the mandible upward and anteriorly. Avoid pressing into the soft submandibular tissues, which can compress the airway.
• Mechanism: Anterior displacement of the mandible pulls the attached hyoid bone and genioglossus muscle forward, lifting the base of the tongue and epiglottis away from the posterior pharyngeal wall.

2. Modified Jaw-Thrust Maneuver

• Indications: Mandatory in any patient with confirmed or suspected trauma, an unknown mechanism of injury, or an unwitnessed collapse with potential fall.
• Technique: The paramedic positions themselves at the patient's head, resting elbows on the ground or stretcher. Place the fingers behind the angles of the mandible bilaterally while resting thumbs over the zygomatic arches or maxilla. Apply continuous upward and anterior force to subluxate the mandible forward without extending, flexing, or rotating the cervical spine. Cervical spine manual in-line stabilization (MILS) must be maintained simultaneously.
• Clinical Pearl: If the modified jaw-thrust fails to open the airway and establish ventilation in a trauma patient, life takes precedence over potential spine injury: gently tilt the head backward just enough to permit ventilation, as persistent anoxia is universally fatal.

3. Left Lateral Recovery Position

• Indications: Unresponsive, spontaneously breathing medical patients with an adequate respiratory rate and tidal volume who do not require positive pressure ventilation and have no suspected spinal or pelvic trauma.
• Physiological Rationale: Placing the patient onto their left side aligns the hypopharynx to promote gravitational drainage of saliva, blood, and gastric secretions out of the mouth, significantly reducing pulmonary aspiration risk. The dependent tongue falls forward rather than backward. The left lateral orientation also relieves inferior vena cava compression in late-term pregnant patients.

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Airway Opening Adjuncts: Oropharyngeal & Nasopharyngeal Airways

Manual maneuvers are physically fatiguing to maintain during transport. Basic airway adjuncts maintain an open corridor between the tongue and the posterior pharyngeal wall, facilitating spontaneous ventilation or manual positive pressure ventilation via bag-valve-mask (BVM).

Oropharyngeal Airway (OPA) Nuances

Selecting the correct size is critical: a device that is too long will compress the epiglottis downward over the laryngeal inlet, causing total mechanical obstruction; a device that is too short will compress the base of the tongue deeper into the pharynx, worsening obstruction. In pediatric patients, the 180-degree rotation technique is strictly contraindicated because the rigid plastic tip can easily avulse the delicate, highly vascular soft palate; paramedics must use a tongue depressor to gently displace the tongue anteriorly and guide the OPA anatomically with its curvature matching the tongue.

Nasopharyngeal Airway (NPA) Nuances

The NPA is exceptionally well tolerated by semi-conscious patients (e.g., postictal state, drug intoxication, hypoglycemia) who require airway maintenance but retain a protective pharyngeal reflex. The right naris is typically larger and straighter; when inserting on the right side, the bevel faces the septum and the curvature matches the airway. If inserting into the left naris, the bevel must still face the septum, which requires inserting the device inverted and rotating it 180 degrees once past the mid-turbinates. Never force an NPA against bony resistance. In suspected basilar skull fractures (characterized by periorbital ecchymosis [raccoon eyes], retroauricular ecchymosis [Battle's sign], hemotympanum, or cerebrospinal fluid [CSF] rhinorrhea/otorrhea), the cribriform plate of the ethmoid bone may be shattered, creating a direct path for the NPA into the cranial vault and frontal brain tissue.

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Oropharyngeal & Tracheobronchial Suctioning Protocols

Airway opening maneuvers and adjuncts are useless if the conduit remains filled with fluids. Prehospital suctioning clears secretions, blood, and gastric contents to prevent fatal aspiration pneumonitis and maintain gas exchange.

Suction Catheter Selection

1. Rigid Pharyngeal Catheter (Yankauer / Tonsil-Tip): Large-bore, rigid plastic device designed exclusively for oropharyngeal clearance. Its wide lumen accommodates thick secretions, clotted blood, and particulate vomitus. It must be manipulated under direct visualization to avoid soft tissue gouging.
2. Flexible Suction Catheter (French / Whistle-Tip): Soft, flexible tubing used for nasopharyngeal suctioning, clearing tracheostomy tubes, or clearing secretions through advanced airway conduits (supraglottic airways or endotracheal tubes).

Negative Pressure Limits and Operational Vacuum Settings

To prevent excessive mucosal trauma, capillary hemorrhage, and pulmonary atelectasis, suction units must be regulated to standardized negative pressure limits:

• Adults: -80 to -120 mmHg (portable units may be calibrated up to -150 mmHg for massive particulate emesis, but -80 to -120 mmHg is the recognized standard safe range).
• Pediatrics (Children): -80 to -100 mmHg.
• Infants / Neonates: -60 to -80 mmHg.

Suction Vacuum Pressure Calibration:
[Occlude Tubing] ➔ [Adjust Vacuum Gauge to -80 to -120 mmHg] ➔ [Test with Sterile Saline]

Step-by-Step Technique and Duration Limits

Suctioning inevitably evacuates oxygen from the hypopharynx and lungs alongside secretions. Hypoxemia and intense vagal nerve stimulation are frequent, life-threatening complications. Paramedics must adhere to the following protocol:

1. Pre-Oxygenation: Administer high-flow supplemental oxygen (100% FiO2) for at least 1 to 2 minutes prior to suctioning when clinical circumstances permit.
2. Measurement & Insertion: Measure the rigid catheter from the corner of the mouth to the angle of the jaw. Insert the catheter into the oral cavity under direct vision without applying suction (leave the thumb port open).
3. Application of Suction: Once the catheter is positioned at the desired anatomical depth, occlude the thumb port and apply suction only while withdrawing the catheter.
4. Rotational Withdrawal: Withdraw the catheter using a smooth, rolling/twirling motion between the fingers to sweep the pharynx and prevent the catheter tip from vacuum-locking onto mucosal walls.
5. Strict Duration Limits:
   • Adults: Maximum 10 to 15 seconds per suction cycle.
   • Children: Maximum 5 to 10 seconds.
   • Infants: Maximum 5 seconds.
6. Post-Oxygenation & Reassessment: Immediately re-oxygenate and ventilate the patient for 1 to 2 minutes between attempts, monitoring heart rate and SpO2. If profound bradycardia develops (due to vagal stimulation), immediately abort suctioning, withdraw the catheter, and ventilate with 100% oxygen.

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Clinical Scenario: Unresponsive Overdose with Airway Compromise

Prehospital Encounter: Polysubstance Toxicity

Paramedics are dispatched to an urban alleyway for an unresponsive male found slumped against a brick wall. On arrival, the crew finds a 46-year-old male with central cyanosis, pinpoint pupils, and shallow, irregular respirations at 6 breaths/min. Loud, coarse sonorous snoring is audible from several meters away, interrupted by bubbling gurgles.

Immediate Assessment & Manual Maneuver:
The lead paramedic initiates a primary survey: GCS is 3 (Eye 1, Verbal 1, Motor 1). Pulse is 54 bpm, weak and regular; SpO2 is 68% on room air. Because there is no history or evidence of trauma, the paramedic immediately executes a head-tilt chin-lift maneuver. The snoring sound resolves instantly, confirming that the tongue was obstructing the pharynx; however, coarse gurgling persists due to pooled secretions in the oropharynx.

Mechanical Clearance & Suctioning:
The secondary paramedic powers on the portable suction unit, occludes the tubing, and confirms the regulator gauge is set to -100 mmHg. Using a rigid Yankauer catheter measured to the angle of the jaw, the paramedic inserts the tip along the inside cheek without suction, occludes the suction port, and withdraws the catheter in a twirling motion for 10 seconds, clearing approximately 30 mL of thick saliva and vomitus. The patient's heart rate remains stable at 56 bpm.

Adjunct Selection & Assisted Ventilation:
The crew attempts to place a size 4 OPA; however, as the tip touches the posterior pharynx, the patient demonstrates an active gag reflex and coughs. The paramedic immediately withdraws the OPA to prevent emesis and laryngospasm. Recognizing that the airway requires mechanical support but the gag reflex is present, the paramedic selects a 28 Fr NPA, checks its diameter against the patient's fifth finger, measures from the tip of the nose to the tragus, and coats it generously with water-soluble lubricant. The NPA is gently advanced along the floor of the right naris with the bevel toward the septum until the flange rests flush against the nostril. No epistaxis occurs. The crew initiates gentle BVM ventilations with high-flow oxygen at 1 breath every 6 seconds, producing immediate bilateral chest rise. Within 90 seconds, SpO2 rises to 96%, and naloxone is administered with full recovery.

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Exam Pitfalls & High-Yield Pearls

• Modified Jaw-Thrust vs Head-Tilt: In any scenario with trauma or unknown MOI, the modified jaw-thrust is the ONLY correct manual maneuver. Never hyperextend the neck.
• OPA Contraindication: An intact gag reflex is an absolute contraindication to OPA placement. Forcing an OPA triggers vomiting, aspiration, and laryngospasm. If the patient gags, immediately remove it and switch to an NPA.
• NPA Contraindication: Never place an NPA in patients with mid-face smash or signs of basilar skull fracture (raccoon eyes, Battle's sign, CSF leak). The catheter can penetrate the fractured cribriform plate and enter the brain.
• Suctioning Rules: Never apply suction while inserting a catheter; apply suction only on withdrawal. Never exceed 15 seconds in an adult (5 seconds in an infant). Pre-oxygenate before and after every suction pass.
• Vagal Bradycardia: In pediatric patients and hypoxemic adults, suctioning the posterior pharynx easily stimulates the glossopharyngeal and vagus nerves, inducing catastrophic bradycardia. Abort suctioning if the heart rate drops.