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MODULE 2: AIRWAY, RESPIRATION & VENTILATION Memorize → Understand → Connect → Apply Based on the supplied chapter-review screenshots from Emergency Care, 14th edition (airway management and respiration/artificial ventilation). Original supplementary teaching, not a reproduction of the full textbook. Follow Army course instruction and current local EMS protocols for specific procedures and treatment thresholds. 1. Learn the vocabulary Airway: The path air takes into the lungs. Why it matters: A blocked airway means air cannot reach the alveoli. Ventilation: Moving air into and out of the lungs. Why it matters: Air movement clears carbon dioxide (CO2); oxygen alone cannot replace it. Oxygenation: Getting oxygen into the blood. Why it matters: Oxygen saturation is related to this, not a direct measure of ventilation. Respiration: Gas exchange in the lungs and tissues. Why it matters: Air movement, gas exchange, and circulation must all work.
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Tidal volume: The volume of air moved in one breath. Why it matters: Shallow breaths may not move enough fresh air to the alveoli. Perfusion: Blood flow through body tissues. Why it matters: Even oxygen-rich blood is ineffective if it cannot reach cells. 2. Memorize the starting numbers • Adult resting respiratory rate: approximately 12–20 breaths/min. • Adult resting heart rate: approximately 60–100 beats/min. • SpO2: often 95–100% in a healthy adult at sea level; a reading must be interpreted in context. • Do not decide from one number: assess rate, depth, chest rise, effort, skin, mental status, and overall condition. Memory check: What is the difference between 30 deep breaths/min and 30 tiny breaths/min? Both have an elevated rate, but only one may be moving enough air. 30 deep breaths/min 30 tiny breaths/min
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3. Why fast breathing can still be inadequate Minute ventilation = respiratory rate × tidal volume. This describes total air moved per minute, not how much reaches the gas-exchanging alveoli. Some air remains in the conducting airways (dead space). respiratory rate x tidal volume = minute ventilation If someone takes very shallow breaths, much of each breath may remain in dead space. So a respiratory rate of 34 does not guarantee adequate ventilation. Look for chest rise, depth, work of breathing, fatigue, and mental status. Connect: Weak breaths → less fresh air reaching alveoli → poorer CO2 elimination (and potentially oxygenation) → worsening mental status and eventually respiratory failure. 4. Oxygenation versus ventilation Oxygenation: Is oxygen getting into the blood? A pulse oximeter estimates oxygen saturation of hemoglobin. It has limitations and may lag behind clinical deterioration.
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Ventilation: Is enough air moving to remove CO2? Assess rate AND depth, chest rise, effort, and mental status. Capnography can help when available and indicated. oxygen: lungs -> blood CO2: blood -> lungs Why a normal SpO2 can be misleading: A patient breathing only 5 times/min may retain CO2 even while oxygen saturation remains high, particularly when supplemental oxygen is being administered. Memory hook: Oxygen is the cargo. Ventilation is the movement of air. Circulation is the delivery truck. A problem with any one can threaten the patient. 5. Distress, failure, and arrest Respiratory distress: The patient is struggling to breathe. Clues include increased rate, accessory muscles, retractions, nasal flaring, and difficulty speaking. Ventilation may still be adequate, but the patient can deteriorate. Respiratory failure: Breathing is insufficient for oxygenation and/or CO2 removal. Clues include very shallow breaths, poor chest rise, exhaustion,
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decreasing responsiveness, or abnormal slowing/irregularity. Respiratory arrest: No normal breathing. Rapidly check responsiveness and pulse and follow the appropriate BLS pathway. Why slowing can be dangerous: A patient who was breathing hard and suddenly becomes quiet with shallow, slow respirations may be exhausting their breathing muscles—not recovering. 6. How breathing changes heart rate and blood pressure Cause-and-effect chain: Inadequate air movement or gas exchange → possible low oxygen and/or high CO2 → stress response → often increased HR and breathing effort initially. If impairment becomes severe or prolonged, hypoxia and exhaustion can contribute to altered mental status, poor circulation, bradycardia, hypotension, and arrest. Not every patient follows an identical sequence. Why HR rises: The sympathetic nervous system increases heart rate as part of a response to physiological stress. Tachycardia is a clue, not proof of one diagnosis.
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7. The airway comes before the oxygen device • Tongue: In an unresponsive patient, loss of muscle tone can allow the tongue and soft tissues to obstruct the airway. • Vomit or secretions: Material blocks airflow and may require suction. • Foreign body: A severe obstruction can prevent effective speech, cough, and air movement. • Swelling: Narrowing can cause noisy breathing, including stridor. Opening the airway: Head-tilt/chin-lift is generally used without suspected spinal trauma; jaw-thrust is generally preferred when cervical spine injury is suspected. Effective airway opening and oxygenation remain priorities. Airway adjuncts: An OPA is generally used in an unresponsive patient without a gag reflex. An NPA may be tolerated with a gag reflex but must be avoided when contraindicated (for example, suspected basilar skull fracture or significant midface trauma). Use the exact course guidance for selection and sizing.
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8. How to decide what to do first • Is the airway patent? If not, open it and clear obstructing material appropriately. • Is breathing adequate? Look at rate, depth, chest rise, effort, mental status, and air movement. • Is breathing effective but oxygenation inadequate? Give indicated oxygen under protocol. • Is ventilation inadequate? Support the airway and assist ventilations with a bag-valve mask (BVM), as indicated. • Is normal breathing absent? Check pulse promptly and follow current BLS/EMT algorithms. Why BVM is different from oxygen alone: A BVM actively moves air into the lungs. Supplemental oxygen raises inspired oxygen concentration but does not correct inadequate movement of air. Deliver breaths that produce visible chest rise and avoid excessive ventilation. 9. Worked scenario: follow the reasoning Patient: A 67-year-old man is drowsy after taking an unknown medication. RR 6/min, shallow chest rise, HR 108/min, SpO2 96% on supplemental oxygen.
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What is abnormal? Very slow, shallow breathing and decreased responsiveness. Which function is threatened? Ventilation: not enough air is moving to remove CO2. Why is 96% not reassuring? Oxygen saturation can remain normal for a period while CO2 builds up, especially with supplemental oxygen. What comes first? Ensure an open airway and assist inadequate ventilations with BVM as indicated, while checking pulse and following protocols. Transfer lesson: A normal oxygen saturation cannot cancel out clearly inadequate breathing. 10. Recall drill: say the WHY aloud
Why can rapid shallow breathing be ineffective?Think through your answer, then select to reveal
Much of each small breath may remain in dead space, so little fresh air reaches alveoli.
Why does SpO2 not tell you if CO2 is being removed?Think through your answer, then select to reveal
It estimates hemoglobin oxygen saturation, not ventilation or CO2 clearance.
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Why can a patient become less responsive during respiratory failure?Think through your answer, then select to reveal
Poor oxygenation and/or rising CO2 can impair brain function.
Why can HR increase during breathing distress?Think through your answer, then select to reveal
Sympathetic stress response often accelerates the heart.
Why might slowing breathing after prolonged distress be ominous?Think through your answer, then select to reveal
Respiratory muscle fatigue may be reducing effective ventilation.
Why might oxygen alone not help a very shallow breather?Think through your answer, then select to reveal
It does not move sufficient air into and out of the lungs.
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Why might an OPA be unsafe in an alert patient?Think through your answer, then select to reveal
An intact gag reflex can provoke gagging and vomiting.
Why is suction sometimes more urgent than applying oxygen?Think through your answer, then select to reveal
Obstructing vomit or secretions can prevent air from reaching the lungs.
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13. Final self-check Without looking back, explain in your own words: (1) ventilation versus oxygenation, (2) why RR 35 can still be inadequate, (3) why SpO2 98% does not rule out hypoventilation, (4) why exhaustion after distress is dangerous, and (5) when BVM support is more important than oxygen alone. Study method: If you miss a question, write the physiological link you missed in one sentence, then retry it tomorrow. A correct guess is not mastery. Source and safety note: Topic scope is drawn from user-supplied review screenshots from Emergency Care, 14th ed., Chapters 9–10. This supplement uses general EMT/BLS principles; exact airway adjunct precautions, oxygen thresholds, ventilation rates, and resuscitation procedures should be checked against the full course text, current NREMT guidance, and local medical direction. These are original practice questions, not actual NREMT questions.