TNCC Airway and Ventilation Management 2 — Questions and Answers
Question 1: A trauma patient with facial burns and singed nasal hairs has a hoarse voice. The priority intervention is:
- Administering humidified oxygen via face mask
- Early endotracheal intubation before airway edema progresses (Correct answer)
- Nebulized epinephrine treatment
- Continuous pulse oximetry monitoring
Correct answer: Early endotracheal intubation before airway edema progresses
Hoarseness with facial burns and singed nasal hairs indicates impending airway compromise from edema. Early intubation is critical before swelling makes it impossible.
Inhalation injury with facial burns, singed nasal hairs, and hoarseness represents an evolving airway emergency. The hoarse voice indicates laryngeal edema has already begun. Upper airway edema from thermal injury can progress rapidly over hours, potentially making intubation extremely difficult or impossible. TNCC guidelines emphasize early, elective intubation in these patients rather than waiting for complete obstruction. The decision to intubate should be made based on clinical signs rather than waiting for desaturation or stridor. Once the airway is secured, the endotracheal tube should not be cut short, as facial and neck swelling may displace a short tube.
Question 2: Which airway adjunct is most appropriate as a temporizing measure for an unconscious trauma patient with intact gag reflex?
- Oropharyngeal airway (OPA)
- Nasopharyngeal airway (NPA) (Correct answer)
- Laryngeal mask airway (LMA)
- Endotracheal tube
Correct answer: Nasopharyngeal airway (NPA)
A nasopharyngeal airway is better tolerated in patients with an intact gag reflex compared to an oropharyngeal airway, which would stimulate gagging and vomiting.
The nasopharyngeal airway (NPA) is a soft rubber or silicone tube inserted through the nostril to the posterior pharynx. Unlike the oropharyngeal airway (OPA), it is well tolerated in patients with intact protective reflexes including the gag reflex, making it suitable for semi-conscious patients. It maintains airway patency by preventing the soft palate and tongue from obstructing the nasopharynx. The NPA is contraindicated in suspected basilar skull or midface fractures due to the risk of intracranial placement. Size is estimated by the distance from the nostril to the earlobe. It should be lubricated with water-soluble lubricant and inserted along the floor of the nasal passage.
Question 3: During rapid sequence intubation of a trauma patient, cricoid pressure (Sellick maneuver) is applied primarily to:
- Improve visualization of the vocal cords
- Prevent aspiration by occluding the esophagus (Correct answer)
- Reduce cervical spine movement
- Facilitate tube passage through the trachea
Correct answer: Prevent aspiration by occluding the esophagus
Cricoid pressure compresses the esophagus against the cervical vertebral body, reducing the risk of passive regurgitation and aspiration during intubation.
The Sellick maneuver applies firm posterior pressure to the cricoid cartilage, which is the only complete cartilaginous ring in the airway. This compresses the esophagus against the body of C6 vertebra, theoretically preventing passive regurgitation of gastric contents during the apneic period of rapid sequence intubation. Trauma patients are always considered to have full stomachs. While recent evidence has questioned its efficacy and some practitioners have moved away from routine use, TNCC and many trauma protocols still include it. Important caveats: cricoid pressure should be released if it impedes intubation or ventilation, and it does NOT prevent active vomiting — if the patient actively retches, pressure must be released to prevent esophageal rupture.
Question 4: A trauma patient has oxygen saturation of 85% despite bag-valve-mask ventilation with 100% oxygen. Breath sounds are absent on the left with tracheal deviation to the right. The immediate intervention is:
- Left chest tube insertion
- Needle decompression at the left 2nd intercostal space, midclavicular line (Correct answer)
- Emergent intubation
- Increase the respiratory rate of bag-valve-mask ventilation
Correct answer: Needle decompression at the left 2nd intercostal space, midclavicular line
Absent breath sounds, tracheal deviation away from the affected side, and hypoxemia indicate tension pneumothorax requiring immediate needle decompression.
This presentation — absent breath sounds unilaterally, contralateral tracheal deviation, hypoxemia, and difficulty ventilating — is classic for tension pneumothorax, a life-threatening condition identified during the 'B' phase of the primary survey. Air enters the pleural space through a one-way valve mechanism, progressively collapsing the lung and shifting the mediastinum, which compresses the contralateral lung and kinks the great vessels, reducing venous return. Treatment is immediate needle decompression using a 14-gauge needle at the 2nd intercostal space, midclavicular line (or 4th-5th intercostal space, anterior axillary line in larger patients). This converts the tension pneumothorax to a simple pneumothorax, followed by definitive chest tube placement. This is a clinical diagnosis — never delay treatment for chest X-ray confirmation.
Question 5: Which of the following confirms correct endotracheal tube placement most reliably?
- Auscultation of bilateral breath sounds
- Visualization of chest rise with ventilation
- Continuous waveform capnography (ETCO2) (Correct answer)
- Condensation in the endotracheal tube
Correct answer: Continuous waveform capnography (ETCO2)
Continuous waveform capnography providing end-tidal CO2 detection is the gold standard for confirming and continuously monitoring correct endotracheal tube placement.
Continuous waveform capnography (ETCO2) is considered the most reliable method for confirming endotracheal tube placement per TNCC, AHA, and multiple international guidelines. It detects carbon dioxide in exhaled gas, which should only be present if the tube is in the trachea (not the esophagus). A sustained waveform with appropriate morphology over multiple breaths confirms tracheal placement. While auscultation, chest rise, and tube condensation are useful adjuncts, they can be unreliable in noisy resuscitation environments, obese patients, or when main-stem bronchial intubation has occurred. Capnography also provides continuous monitoring — a sudden loss of ETCO2 waveform alerts to tube dislodgement, obstruction, or cardiac arrest. Chest X-ray confirms depth of placement but is not immediately available.
Question 6: A trauma patient requires a surgical airway. The anatomical landmark for cricothyrotomy is the membrane between the:
- Hyoid bone and thyroid cartilage
- Thyroid cartilage and cricoid cartilage (Correct answer)
- Cricoid cartilage and first tracheal ring
- First and second tracheal rings
Correct answer: Thyroid cartilage and cricoid cartilage
An emergency cricothyrotomy is performed through the cricothyroid membrane, located between the inferior border of the thyroid cartilage and the superior border of the cricoid cartilage.
The cricothyroid membrane spans the gap between the thyroid cartilage (Adam's apple) superiorly and the cricoid cartilage inferiorly. It is the preferred site for emergency surgical airway access because it is superficial, relatively avascular (the superior cricothyroid arteries run along the upper margin), and easily palpated. The procedure involves a vertical skin incision followed by a horizontal stab through the membrane, then dilation and insertion of a cuffed tracheostomy or endotracheal tube (typically 6.0 mm). Cricothyrotomy is indicated when endotracheal intubation has failed or is impossible (massive facial trauma, airway edema, anatomic obstruction). It is relatively contraindicated in children under 12, where needle cricothyrotomy with jet ventilation is preferred due to the small, pliable cricothyroid membrane.
TNCC Airway and Ventilation Management 2
A trauma patient with facial burns and singed nasal hairs has a hoarse voice.
The priority intervention is: