Air Methods Critical Care Exam Study Guide
2026 - Latest Exam Questions with 100% Verified
Correct Answers & Detailed Rationales
1. What is the most reliable method of confirming and monitoring correct placement of an ET
tube?
Correct Answer: Continuous waveform capnography. ✓
Rationale: Continuous waveform capnography provides real-time confirmation of ET tube
placement by detecting exhaled carbon dioxide. It is more reliable than auscultation or
colorimetric devices because it continuously monitors for displacement.
2. The upper airway consists of...
Correct Answer: Nose, mouth, jaw, oral cavity, pharynx, and larynx. ✓
Rationale: The upper airway extends from the nose and mouth to the larynx. It functions to
warm, humidify, and filter inspired air while also facilitating speech and swallowing.
3. No gas exchange occurs here ______; it's called ______.
Correct Answer: Nose to terminal bronchioles; anatomical dead space (2 mL/kg of inspired
tidal volume). They conduct airflow toward gas exchange units. ✓
Rationale: Anatomical dead space is the volume of the conducting airways where no gas
exchange takes place. It includes the nose, pharynx, trachea, bronchi, and terminal bronchioles.
4. What is the cricothyroid membrane?
Correct Answer: The avascular structure between the thyroid and cricoid cartilages; site of
cricothyrotomy (an emergency opening of the airway). ✓
Rationale: The cricothyroid membrane is easily palpable and avascular, making it the preferred
site for emergency surgical airway access when endotracheal intubation is impossible.
5. A PaCO₂ greater than 45 mmHg indicates:
A. Metabolic acidosis
B. Metabolic alkalosis
C. Respiratory acidosis
pg. 1
,D. Respiratory alkalosis
Correct Answer: C. Respiratory acidosis. ✓
Rationale: PaCO₂ >45 mmHg indicates hypercapnia due to alveolar hypoventilation, causing
respiratory acidosis (pH <7.35). Causes include COPD, opioid overdose, and neuromuscular
disease.
6. What is the normal range for PaCO₂?
Correct Answer: 35-45 mm Hg. Less than 35 likely means hyperventilation (respiratory
alkalosis). ✓
Rationale: Normal PaCO₂ is maintained by alveolar ventilation. Hyperventilation decreases
PaCO₂ (respiratory alkalosis); hypoventilation increases PaCO₂ (respiratory acidosis).
7. Tracheal deviation AWAY from the affected side, decreased breath sounds, and
hyperresonance... What's happening?
Correct Answer: Tension pneumothorax. ✓
Rationale: Tension pneumothorax causes air trapping in the pleural space, shifting the
mediastinum to the opposite side. Tracheal deviation away from the affected side is a late but
classic sign.
8. In a tension pneumothorax, tracheal deviation goes in what direction?
Correct Answer: Away from the affected side. ✓
Rationale: Increased intrapleural pressure on the affected side pushes the trachea and
mediastinum toward the contralateral side, causing obstructive shock and requiring immediate
decompression.
9. What is the normal mean pulmonary artery pressure?
Correct Answer: 10-20 mmHg. ✓
Rationale: *Normal mean PAP is 10-20 mmHg. Pulmonary hypertension is diagnosed when
mean PAP exceeds 20 mmHg at rest.*
10. Pulmonary hypertension is a mean pulmonary artery pressure greater than...
Correct Answer: Greater than 20 mmHg. ✓
Rationale: The hemodynamic definition of pulmonary hypertension is a resting mean PAP >20
mmHg confirmed by right heart catheterization.
pg. 2
,11. What is primary pulmonary hypertension?
Correct Answer: Idiopathic genetic disorder caused by abnormal structure of the pulmonary
blood vessels. ✓
Rationale: Primary (idiopathic) pulmonary hypertension is a rare, progressive disorder with no
identifiable cause, though some cases are linked to genetic mutations (BMPR2).
12. Name three causes of secondary pulmonary hypertension.
Correct Answer: 1. Passive PH (back pressure from mitral stenosis, LV systolic failure); 2.
Active PH (constriction from increased volume, e.g., congenital heart disease); 3. Obstruction
(chronic recurrent pulmonary embolism). ✓
Rationale: Secondary pulmonary hypertension results from underlying conditions. Passive is
post-capillary, active is pre-capillary from increased flow, and obstructive is from mechanical
blockage.
13. What are the resuscitation priorities for a pregnant patient with trauma?
Correct Answer: Resuscitation priorities are the same as non-pregnant patients. The best way to
take care of the baby is to take care of the mother. ✓
Rationale: Maternal stabilization optimizes fetal outcomes. Prioritize airway, breathing,
circulation, and hemorrhage control. Fetal survival depends on maternal perfusion and
oxygenation.
14. What is the most common cause of maternal injury?
Correct Answer: Blunt trauma caused by motor vehicle collision (MVC). Second is blunt
trauma from falls; third is violence. ✓
Rationale: MVCs account for the majority of traumatic injuries during pregnancy. Proper
seatbelt use (lap belt below uterus, shoulder belt between breasts) reduces risk.
15. Why is fetal distress an early sign of maternal distress?
Correct Answer: Catecholamine-mediated vasoconstriction from blood loss shunts blood away
from the fetus to the mother. ✓
Rationale: Maternal hypovolemia triggers sympathetic activation, reducing uterine blood flow
to preserve maternal perfusion. Fetal tachycardia or bradycardia may be the first sign of
maternal compromise.
pg. 3
, 16. How is fetal hypoperfusion evidenced?
Correct Answer: Fetal tachycardia (140 to 160+ bpm) and fetal bradycardia. ✓
Rationale: Initially, hypoperfusion causes fetal tachycardia. As hypoxia worsens, bradycardia
develops. Continuous fetal monitoring is essential for viable pregnancies.
17. What is the functional residual capacity (FRC) in a pregnant patient?
Correct Answer: Reduced by the gravid uterus lifting the diaphragm. ✓
Rationale: *The enlarging uterus elevates the diaphragm, decreasing FRC by 10-20%. This
increases the risk of rapid oxygen desaturation during apnea.*
18. Chest tube placement in a pregnant patient is how many spaces higher?
Correct Answer: 1-2 intercostal spaces higher because of the lifted diaphragm. ✓
Rationale: *The diaphragm is elevated by the gravid uterus. Standard chest tube insertion sites
(4th-5th intercostal space) may be too low; insert 1-2 spaces higher to avoid intra-abdominal
placement.*
19. What is the cause of physiological anemia in pregnant patients?
Correct Answer: Hemodilutional anemia. Plasma volume increases 30-50%, outproportion to
red blood cell mass increase. ✓
Rationale: Physiologic anemia of pregnancy is dilutional, not true iron deficiency. Increased
plasma volume supports uteroplacental circulation but lowers hemoglobin concentration.
20. What is preterm labor (PTL)? (Answer not fully provided in original)
Correct Answer: Regular uterine contractions with cervical change occurring before 37 weeks
gestation. ✓
Rationale: Preterm labor is a leading cause of neonatal morbidity and mortality. Tocolytics may
be used to delay delivery for maternal steroid administration.
21. What is abruptio placentae?
Correct Answer: Premature separation of the placenta from the uterine wall. ✓
Rationale: Abruptio placentae is a medical emergency causing painful vaginal bleeding, uterine
tenderness, and fetal distress. It can lead to disseminated intravascular coagulation (DIC) and
maternal shock.
pg. 4
2026 - Latest Exam Questions with 100% Verified
Correct Answers & Detailed Rationales
1. What is the most reliable method of confirming and monitoring correct placement of an ET
tube?
Correct Answer: Continuous waveform capnography. ✓
Rationale: Continuous waveform capnography provides real-time confirmation of ET tube
placement by detecting exhaled carbon dioxide. It is more reliable than auscultation or
colorimetric devices because it continuously monitors for displacement.
2. The upper airway consists of...
Correct Answer: Nose, mouth, jaw, oral cavity, pharynx, and larynx. ✓
Rationale: The upper airway extends from the nose and mouth to the larynx. It functions to
warm, humidify, and filter inspired air while also facilitating speech and swallowing.
3. No gas exchange occurs here ______; it's called ______.
Correct Answer: Nose to terminal bronchioles; anatomical dead space (2 mL/kg of inspired
tidal volume). They conduct airflow toward gas exchange units. ✓
Rationale: Anatomical dead space is the volume of the conducting airways where no gas
exchange takes place. It includes the nose, pharynx, trachea, bronchi, and terminal bronchioles.
4. What is the cricothyroid membrane?
Correct Answer: The avascular structure between the thyroid and cricoid cartilages; site of
cricothyrotomy (an emergency opening of the airway). ✓
Rationale: The cricothyroid membrane is easily palpable and avascular, making it the preferred
site for emergency surgical airway access when endotracheal intubation is impossible.
5. A PaCO₂ greater than 45 mmHg indicates:
A. Metabolic acidosis
B. Metabolic alkalosis
C. Respiratory acidosis
pg. 1
,D. Respiratory alkalosis
Correct Answer: C. Respiratory acidosis. ✓
Rationale: PaCO₂ >45 mmHg indicates hypercapnia due to alveolar hypoventilation, causing
respiratory acidosis (pH <7.35). Causes include COPD, opioid overdose, and neuromuscular
disease.
6. What is the normal range for PaCO₂?
Correct Answer: 35-45 mm Hg. Less than 35 likely means hyperventilation (respiratory
alkalosis). ✓
Rationale: Normal PaCO₂ is maintained by alveolar ventilation. Hyperventilation decreases
PaCO₂ (respiratory alkalosis); hypoventilation increases PaCO₂ (respiratory acidosis).
7. Tracheal deviation AWAY from the affected side, decreased breath sounds, and
hyperresonance... What's happening?
Correct Answer: Tension pneumothorax. ✓
Rationale: Tension pneumothorax causes air trapping in the pleural space, shifting the
mediastinum to the opposite side. Tracheal deviation away from the affected side is a late but
classic sign.
8. In a tension pneumothorax, tracheal deviation goes in what direction?
Correct Answer: Away from the affected side. ✓
Rationale: Increased intrapleural pressure on the affected side pushes the trachea and
mediastinum toward the contralateral side, causing obstructive shock and requiring immediate
decompression.
9. What is the normal mean pulmonary artery pressure?
Correct Answer: 10-20 mmHg. ✓
Rationale: *Normal mean PAP is 10-20 mmHg. Pulmonary hypertension is diagnosed when
mean PAP exceeds 20 mmHg at rest.*
10. Pulmonary hypertension is a mean pulmonary artery pressure greater than...
Correct Answer: Greater than 20 mmHg. ✓
Rationale: The hemodynamic definition of pulmonary hypertension is a resting mean PAP >20
mmHg confirmed by right heart catheterization.
pg. 2
,11. What is primary pulmonary hypertension?
Correct Answer: Idiopathic genetic disorder caused by abnormal structure of the pulmonary
blood vessels. ✓
Rationale: Primary (idiopathic) pulmonary hypertension is a rare, progressive disorder with no
identifiable cause, though some cases are linked to genetic mutations (BMPR2).
12. Name three causes of secondary pulmonary hypertension.
Correct Answer: 1. Passive PH (back pressure from mitral stenosis, LV systolic failure); 2.
Active PH (constriction from increased volume, e.g., congenital heart disease); 3. Obstruction
(chronic recurrent pulmonary embolism). ✓
Rationale: Secondary pulmonary hypertension results from underlying conditions. Passive is
post-capillary, active is pre-capillary from increased flow, and obstructive is from mechanical
blockage.
13. What are the resuscitation priorities for a pregnant patient with trauma?
Correct Answer: Resuscitation priorities are the same as non-pregnant patients. The best way to
take care of the baby is to take care of the mother. ✓
Rationale: Maternal stabilization optimizes fetal outcomes. Prioritize airway, breathing,
circulation, and hemorrhage control. Fetal survival depends on maternal perfusion and
oxygenation.
14. What is the most common cause of maternal injury?
Correct Answer: Blunt trauma caused by motor vehicle collision (MVC). Second is blunt
trauma from falls; third is violence. ✓
Rationale: MVCs account for the majority of traumatic injuries during pregnancy. Proper
seatbelt use (lap belt below uterus, shoulder belt between breasts) reduces risk.
15. Why is fetal distress an early sign of maternal distress?
Correct Answer: Catecholamine-mediated vasoconstriction from blood loss shunts blood away
from the fetus to the mother. ✓
Rationale: Maternal hypovolemia triggers sympathetic activation, reducing uterine blood flow
to preserve maternal perfusion. Fetal tachycardia or bradycardia may be the first sign of
maternal compromise.
pg. 3
, 16. How is fetal hypoperfusion evidenced?
Correct Answer: Fetal tachycardia (140 to 160+ bpm) and fetal bradycardia. ✓
Rationale: Initially, hypoperfusion causes fetal tachycardia. As hypoxia worsens, bradycardia
develops. Continuous fetal monitoring is essential for viable pregnancies.
17. What is the functional residual capacity (FRC) in a pregnant patient?
Correct Answer: Reduced by the gravid uterus lifting the diaphragm. ✓
Rationale: *The enlarging uterus elevates the diaphragm, decreasing FRC by 10-20%. This
increases the risk of rapid oxygen desaturation during apnea.*
18. Chest tube placement in a pregnant patient is how many spaces higher?
Correct Answer: 1-2 intercostal spaces higher because of the lifted diaphragm. ✓
Rationale: *The diaphragm is elevated by the gravid uterus. Standard chest tube insertion sites
(4th-5th intercostal space) may be too low; insert 1-2 spaces higher to avoid intra-abdominal
placement.*
19. What is the cause of physiological anemia in pregnant patients?
Correct Answer: Hemodilutional anemia. Plasma volume increases 30-50%, outproportion to
red blood cell mass increase. ✓
Rationale: Physiologic anemia of pregnancy is dilutional, not true iron deficiency. Increased
plasma volume supports uteroplacental circulation but lowers hemoglobin concentration.
20. What is preterm labor (PTL)? (Answer not fully provided in original)
Correct Answer: Regular uterine contractions with cervical change occurring before 37 weeks
gestation. ✓
Rationale: Preterm labor is a leading cause of neonatal morbidity and mortality. Tocolytics may
be used to delay delivery for maternal steroid administration.
21. What is abruptio placentae?
Correct Answer: Premature separation of the placenta from the uterine wall. ✓
Rationale: Abruptio placentae is a medical emergency causing painful vaginal bleeding, uterine
tenderness, and fetal distress. It can lead to disseminated intravascular coagulation (DIC) and
maternal shock.
pg. 4
