Air Methods Critical Care Exam
(Actual 2025/2026) – 199 Questions
and Verified Answers
1. What is the most reliable method of confirming and
monitoring correct placement of an ET tube?
Answer: Continuous waveform capnography.
Rationale: Continuous waveform capnography provides
immediate, real-time feedback on ET tube placement by detecting
exhaled CO2. It is the gold standard, more reliable than
auscultation or colorimetric devices.
2. The upper airway consists of which structures?
Answer: Nose, mouth, jaw, oral cavity, pharynx, and larynx.
Rationale: The upper airway includes all structures from the nose
and mouth down to the larynx, functioning to conduct air,
warm/humidify it, and protect the lower airway.
3. No gas exchange occurs from the nose to the terminal
bronchioles; this area is called what?
Answer: Anatomical dead space.
Rationale: Anatomical dead space refers to the volume of the
conducting airways where no gas exchange occurs. In a healthy
adult, this is approximately 2 mL/kg of inspired tidal volume.
4. The cricothyroid membrane is located between which two
cartilages?
,Answer: The cricoid and thyroid cartilages.
Rationale: The cricothyroid membrane is a thin ligament between
the cricoid and thyroid cartilages, making it the primary site for a
surgical or needle cricothyrotomy in a "can't intubate, can't
ventilate" scenario.
5. What is the minimum target oxygen saturation for a
patient with a traumatic brain injury?
Answer: Greater than 90% (typically 94-99%).
Rationale: Hypoxia worsens secondary brain injury. Maintaining
SpO2 >90% ensures adequate oxygen delivery to injured brain
tissue, though 94-99% is often preferred to avoid hyperoxia.
6. In a patient with suspected increased intracranial pressure,
what ETCO2 range is recommended for short-term
hyperventilation?
Answer: 30-35 mmHg.
Rationale: Moderate hyperventilation (ETCO2 30-35) causes
cerebral vasoconstriction, reducing cerebral blood volume and
ICP. Aggressive hyperventilation (ETCO2 <25) can cause cerebral
ischemia.
7. What is the primary indication for a surgical
cricothyrotomy?
Answer: Failed airway where bag-valve-mask ventilation and
endotracheal intubation are impossible (can't intubate, can't
ventilate).
Rationale: Cricothyrotomy is a rescue procedure for the "can't
intubate, can't ventilate" scenario, providing a definitive airway
when other methods fail.
,8. What is the most common complication of endotracheal
intubation in the prehospital or critical care transport
environment?
Answer: Esophageal intubation.
Rationale: Esophageal intubation remains a common preventable
complication. Continuous waveform capnography is the best
method for immediate detection.
9. What is the primary difference between a tension
pneumothorax and a simple pneumothorax?
Answer: Tension pneumothorax causes hemodynamic
compromise (hypotension, shock) due to mediastinal shift and
decreased venous return.
Rationale: A simple pneumothorax has air in the pleural space
but no significant pressure effect. Tension pneumothorax traps air,
causing progressive hypotension, distended neck veins, and
tracheal deviation.
10. What is the preferred initial treatment for a suspected
tension pneumothorax in a critically ill or unstable patient?
Answer: Needle decompression (large-bore catheter in the 2nd
intercostal space, midclavicular line) followed by chest tube.
Rationale: Needle decompression rapidly releases trapped
intrapleural pressure, restoring cardiac output. Definitive
treatment requires chest tube placement.
11. What is the normal range for central venous pressure
(CVP)?
Answer: 2-8 mmHg.
Rationale: CVP reflects right atrial pressure and is an estimate of
, right ventricular preload. Normal range is 2-8 mmHg, though
dynamic measures are often more reliable.
12. In a patient with septic shock, what is the initial target
mean arterial pressure (MAP)?
Answer: Greater than 65 mmHg.
Rationale: MAP >65 mmHg is the standard initial target for septic
shock to ensure adequate perfusion to vital organs, as per
Surviving Sepsis Campaign guidelines.
13. What does a narrowed pulse pressure (e.g., 90/70)
suggest?
Answer: Decreased stroke volume, often from cardiac
tamponade, tension pneumothorax, or hypovolemic shock.
Rationale: Narrow pulse pressure reflects a small difference
between systolic and diastolic pressures, typically indicating
reduced stroke volume or impaired cardiac output.
14. What is the formula for calculating MAP?
Answer: MAP = (Systolic BP + 2(Diastolic BP)) / 3.
Rationale: This formula accounts for the longer duration of
diastole in the cardiac cycle. Alternatively, MAP = Diastolic BP +
1/3 (Pulse Pressure).
15. What is the first-line vasopressor for septic shock?
Answer: Norepinephrine.
Rationale: Norepinephrine is recommended as the first-line
vasopressor in septic shock due to its potent alpha-adrenergic
effects (vasoconstriction) with less chronotropic effect than
dopamine.
(Actual 2025/2026) – 199 Questions
and Verified Answers
1. What is the most reliable method of confirming and
monitoring correct placement of an ET tube?
Answer: Continuous waveform capnography.
Rationale: Continuous waveform capnography provides
immediate, real-time feedback on ET tube placement by detecting
exhaled CO2. It is the gold standard, more reliable than
auscultation or colorimetric devices.
2. The upper airway consists of which structures?
Answer: Nose, mouth, jaw, oral cavity, pharynx, and larynx.
Rationale: The upper airway includes all structures from the nose
and mouth down to the larynx, functioning to conduct air,
warm/humidify it, and protect the lower airway.
3. No gas exchange occurs from the nose to the terminal
bronchioles; this area is called what?
Answer: Anatomical dead space.
Rationale: Anatomical dead space refers to the volume of the
conducting airways where no gas exchange occurs. In a healthy
adult, this is approximately 2 mL/kg of inspired tidal volume.
4. The cricothyroid membrane is located between which two
cartilages?
,Answer: The cricoid and thyroid cartilages.
Rationale: The cricothyroid membrane is a thin ligament between
the cricoid and thyroid cartilages, making it the primary site for a
surgical or needle cricothyrotomy in a "can't intubate, can't
ventilate" scenario.
5. What is the minimum target oxygen saturation for a
patient with a traumatic brain injury?
Answer: Greater than 90% (typically 94-99%).
Rationale: Hypoxia worsens secondary brain injury. Maintaining
SpO2 >90% ensures adequate oxygen delivery to injured brain
tissue, though 94-99% is often preferred to avoid hyperoxia.
6. In a patient with suspected increased intracranial pressure,
what ETCO2 range is recommended for short-term
hyperventilation?
Answer: 30-35 mmHg.
Rationale: Moderate hyperventilation (ETCO2 30-35) causes
cerebral vasoconstriction, reducing cerebral blood volume and
ICP. Aggressive hyperventilation (ETCO2 <25) can cause cerebral
ischemia.
7. What is the primary indication for a surgical
cricothyrotomy?
Answer: Failed airway where bag-valve-mask ventilation and
endotracheal intubation are impossible (can't intubate, can't
ventilate).
Rationale: Cricothyrotomy is a rescue procedure for the "can't
intubate, can't ventilate" scenario, providing a definitive airway
when other methods fail.
,8. What is the most common complication of endotracheal
intubation in the prehospital or critical care transport
environment?
Answer: Esophageal intubation.
Rationale: Esophageal intubation remains a common preventable
complication. Continuous waveform capnography is the best
method for immediate detection.
9. What is the primary difference between a tension
pneumothorax and a simple pneumothorax?
Answer: Tension pneumothorax causes hemodynamic
compromise (hypotension, shock) due to mediastinal shift and
decreased venous return.
Rationale: A simple pneumothorax has air in the pleural space
but no significant pressure effect. Tension pneumothorax traps air,
causing progressive hypotension, distended neck veins, and
tracheal deviation.
10. What is the preferred initial treatment for a suspected
tension pneumothorax in a critically ill or unstable patient?
Answer: Needle decompression (large-bore catheter in the 2nd
intercostal space, midclavicular line) followed by chest tube.
Rationale: Needle decompression rapidly releases trapped
intrapleural pressure, restoring cardiac output. Definitive
treatment requires chest tube placement.
11. What is the normal range for central venous pressure
(CVP)?
Answer: 2-8 mmHg.
Rationale: CVP reflects right atrial pressure and is an estimate of
, right ventricular preload. Normal range is 2-8 mmHg, though
dynamic measures are often more reliable.
12. In a patient with septic shock, what is the initial target
mean arterial pressure (MAP)?
Answer: Greater than 65 mmHg.
Rationale: MAP >65 mmHg is the standard initial target for septic
shock to ensure adequate perfusion to vital organs, as per
Surviving Sepsis Campaign guidelines.
13. What does a narrowed pulse pressure (e.g., 90/70)
suggest?
Answer: Decreased stroke volume, often from cardiac
tamponade, tension pneumothorax, or hypovolemic shock.
Rationale: Narrow pulse pressure reflects a small difference
between systolic and diastolic pressures, typically indicating
reduced stroke volume or impaired cardiac output.
14. What is the formula for calculating MAP?
Answer: MAP = (Systolic BP + 2(Diastolic BP)) / 3.
Rationale: This formula accounts for the longer duration of
diastole in the cardiac cycle. Alternatively, MAP = Diastolic BP +
1/3 (Pulse Pressure).
15. What is the first-line vasopressor for septic shock?
Answer: Norepinephrine.
Rationale: Norepinephrine is recommended as the first-line
vasopressor in septic shock due to its potent alpha-adrenergic
effects (vasoconstriction) with less chronotropic effect than
dopamine.
