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Domain 1: Airway Anatomy & Physiology (20 Questions)
Q1: A 45-year-old male presents after a motor vehicle collision with facial trauma. He is
conscious but has significant oral bleeding and complains of difficulty breathing. Which
anatomical structure, if fractured or displaced posteriorly, poses the greatest immediate
threat to airway patency?
A. Zygomatic arch
B. Nasal septum
C. Maxilla
D. Mandible
Correct Answer: C
Rationale: The maxilla forms the central facial structure and, when fractured (Le Fort
fractures), can displace posteriorly along with the hard palate, soft palate, and attached
structures, causing immediate airway obstruction. This is a high-yield FISDAP concept
because maxillary fractures can cause the maxilla to "fall back" and occlude the
oropharynx. The zygomatic arch (A) fracture affects facial contour but not airway
patency. The nasal septum (B) may cause epistaxis but isolated fractures rarely cause
,complete obstruction. The mandible (D) fracture may cause bleeding and difficulty
handling secretions but does not typically cause the same posterior displacement risk
as maxillary fractures.
Q2: During endotracheal intubation, at what anatomical landmark does the trachea
begin?
A. Cricoid cartilage
B. Thyroid cartilage
C. C4 vertebral level
D. C6 vertebral level
Correct Answer: D
Rationale: The trachea begins at the inferior border of the cricoid cartilage at
approximately the C6 vertebral level. This is critical knowledge for intubation as the
cricoid cartilage (A) is the landmark for cricoid pressure (Sellick's maneuver) and is
superior to the tracheal opening. The thyroid cartilage (B) forms the laryngeal
prominence ("Adam's apple") and is superior to the cricoid. C4 (C) is too superior and
corresponds to the thyroid cartilage level. FISDAP frequently tests anatomical
relationships—remember "C6 cricoid, trachea starts below."
Q3: A 28-year-old female with anaphylaxis develops stridor. The paramedic recognizes
this as indicating obstruction at which anatomical level?
A. Bronchial level
B. Alveolar level
,C. Supraglottic level
D. Tracheal level
Correct Answer: C
Rationale: Stridor is a high-pitched, inspiratory sound indicating upper airway
(supraglottic) obstruction, typically at the level of the larynx or above. In anaphylaxis,
angioedema causes swelling of the tongue, epiglottis, and supraglottic structures.
Bronchial obstruction (A) produces wheezing (expiratory > inspiratory). Alveolar level
issues (B) cause crackles or diminished breath sounds. Tracheal obstruction (D) may
cause biphasic stridor but is less common than supraglottic causes in anaphylaxis.
FISDAP tests sound localization heavily—remember: stridor = upper airway, wheeze =
lower airway.
Q4: The primary muscle of inspiration is:
A. Sternocleidomastoid
B. External intercostals
C. Diaphragm
D. Scalene muscles
Correct Answer: C
Rationale: The diaphragm is the primary muscle of inspiration, responsible for
approximately 70-80% of tidal volume during normal quiet breathing. It contracts and
descends, increasing thoracic volume. The external intercostals (B) are secondary
muscles that elevate ribs. The sternocleidomastoid (A) and scalenes (D) are accessory
muscles recruited during respiratory distress. FISDAP often asks about accessory
, muscle use as a sign of respiratory distress, but the diaphragm remains the primary
driver. Remember: quiet breathing = diaphragm primarily; distress = accessory muscles
recruited.
Q5: A patient has a PaO2 of 60 mmHg on room air. Which oxygen delivery device is
MOST appropriate to achieve a target SpO2 of 94%?
A. Nasal cannula at 2 L/min
B. Simple face mask at 6 L/min
C. Non-rebreather mask at 15 L/min
D. Bag-valve-mask with reservoir
Correct Answer: C
Rationale: A PaO2 of 60 mmHg indicates moderate hypoxemia (normal PaO2 is 80-100
mmHg on room air). The oxyhemoglobin dissociation curve shows PaO2 of 60
corresponds to approximately 90% SpO2. To increase to 94%, high-flow oxygen is
needed. A non-rebreather mask (NRB) at 15 L/min delivers 60-90% FiO2 and is
appropriate for moderate to severe hypoxemia. Nasal cannula at 2 L/min (A) delivers
only 28% FiO2—insufficient. Simple face mask (B) delivers 35-50% at 6 L/min but
requires minimum 6 L/min to prevent CO2 rebreathing and delivers lower FiO2 than
NRB. BVM (D) is for ventilatory failure or apnea, not isolated oxygenation issues.
FISDAP tests device selection based on patient presentation—key is matching device
capability to patient need.
Q6: Which structure prevents aspiration during swallowing?
A. Arytenoid cartilages