Lewis Med-Surg 12th Edition Respiratory Unit Mastery Guide (Ch. 27–30): Pass Every Exam Question

The Lewis respiratory unit — Chapters 27 through 30 — is the second most heavily tested section in every Lewis Medical-Surgical Nursing course, right behind cardiovascular. Respiratory questions carry enormous NCLEX weight because airway is always the first priority in clinical reasoning. Students who master this unit don't just score better on their med-surg exams — they build the automatic prioritization thinking that the NCLEX rewards on every section.

This guide breaks down every chapter, the highest-yield concepts professors actually test, the clinical reasoning traps that cause students to miss these questions, and the practice questions that make these patterns automatic.

Ch 27–304 respiratory chapters in Lewis 12e

#2Most tested unit in Lewis courses

26–38%Of NCLEX — physiological integrity including respiratory

$15.99Lewis 12e test bank — all 69 chapters

🫁 Why respiratory is always priority #1 on NCLEX: The ABCs framework — Airway, Breathing, Circulation — means respiratory problems take precedence over almost every other clinical concern. A patient with SpO2 84% and a patient with 3+ pitting edema in the same question? You address the SpO2 first, every single time. Lewis Chapters 27–30 build this reasoning through every condition they cover.

Chapter 27 — Lower Respiratory Problems (COPD, Asthma, CF)

Ch. 27

Lower Respiratory Problems — COPD, Asthma, Cystic Fibrosis

🔥 #1 Most Missed Chapter

Chapter 27 is the most frequently missed chapter in the entire Lewis respiratory unit — not because it's the most complex, but because it contains the single most classic Lewis exam trap: O2 toxicity in COPD. This concept appears on virtually every Lewis Chapter 27 exam and is consistently missed by students who haven't practiced it deliberately.

COPD O2 target 88–92% — NOT higher Hypoxic drive — do NOT over-oxygenate Pursed-lip breathing — reduces air trapping Tripod position — reduces work of breathing Asthma — peak flow meter use, rescue vs. maintenance inhalers CF — pancreatic enzymes with meals, chest physiotherapy COPD barrel chest — air trapping pathophysiology Pursed-lip breathing vs. diaphragmatic breathing

The concept every Lewis professor tests from Chapter 27: A COPD patient has SpO2 97% on 3L O2. What does the nurse do? Reduce the oxygen. 97% is too high for a COPD patient — they rely on hypoxic drive, and suppressing it causes CO2 retention and hypoventilation. The target is 88–92%, not 95–100%.

Lewis Ch. 27 — COPD O2 Management (Classic Trap)

Clinical scenario: A nurse is caring for a patient with a 20-year history of COPD who is receiving supplemental oxygen at 4 L/min via nasal cannula. The patient is alert, comfortable, with RR 16 and SpO2 97%.

What is the nurse's priority action?

A. Document the SpO2 and continue current oxygen flow rate — the patient is stable
B. Increase oxygen to 6 L/min to maintain saturation above 95%
C. Reduce the oxygen flow rate to target a SpO2 of 88–92% and reassess
D. Notify the healthcare provider that the SpO2 has reached an acceptable level

Correct: C. COPD patients develop chronic hypercapnia — their central chemoreceptors become desensitized to high CO2 and instead use LOW O2 as the primary trigger for breathing (hypoxic drive). An SpO2 of 97% on 4L suppresses this drive, risking hypoventilation and dangerous CO2 retention. Reduce the flow rate and target 88–92%. ⚠️ Why A is the trap: "The patient is stable" — this is the most common wrong answer because the patient looks fine. The danger is not immediate; it develops as CO2 rises silently over time. That's exactly why this question tests clinical reasoning, not just observation.

Chapter 28 — Lower Respiratory Problems (Pneumonia, TB, Lung Cancer)

Ch. 28

Pneumonia, Tuberculosis, Lung Cancer, Pleural Effusion

🔥 High Yield

Pneumonia questions in Lewis Chapter 28 focus on three things: infection control precautions (which type of pneumonia requires which isolation), priority nursing interventions (positioning, hydration, O2), and patient education for discharge. TB questions are almost always about airborne precautions and the four-drug regimen. These are consistent, predictable question types that practice makes automatic.

Pneumonia positioning — HOB elevated 30–45° TB — airborne precautions, N95 mask, negative pressure room Community vs. hospital-acquired pneumonia distinction Pneumonia — encourage fluids 2–3L/day to loosen secretions Thoracentesis — sit upright, arms on overbed table Pleural effusion — auscultation findings (diminished breath sounds) Lung cancer — smoking cessation, palliative options Incentive spirometry — 10 breaths per hour while awake

Lewis Ch. 28 — Pneumonia Priority

Clinical scenario: A patient admitted with bacterial pneumonia has: T 38.9°C, HR 104, RR 24, SpO2 89% on room air, productive cough with yellow-green sputum. The nurse has applied 2L O2 via nasal cannula and SpO2 is now 93%.

Which nursing action is the highest priority at this time?

A. Encourage the patient to drink 3 L of fluids over the next 24 hours
B. Position the patient with the head of the bed elevated 30–45 degrees
C. Collect a sputum specimen before administering the prescribed antibiotic
D. Administer prescribed antipyretic medication to reduce the fever

Correct: B. HOB elevation is an immediate independent nursing action that improves ventilation by allowing full lung expansion and reducing aspiration risk — critical in pneumonia. SpO2 is 93% on O2 but respiratory rate is still 24 — the work of breathing needs support now. Sputum collection (C) is important but the question says antibiotic hasn't been given yet — however, positioning takes priority for the immediate respiratory status. Antipyretics (D) address comfort, not the breathing priority. ⚠️ Why D is tempting: The fever is 38.9°C — that feels urgent. But antipyretics address comfort, not the primary respiratory concern. ABCs always come before comfort measures on Lewis and NCLEX questions.

Respiratory Precautions — The Most Tested Table in Chapter 28

Condition	Precaution Type	PPE Required	Room Requirement
Tuberculosis (TB)	Airborne	N95 respirator (NOT surgical mask)	Negative pressure room — door closed
Measles, Varicella, Disseminated Zoster	Airborne	N95 respirator	Negative pressure room
Influenza, Pertussis, Meningitis	Droplet	Surgical mask (within 3 feet)	Private room preferred
MRSA, C. diff, wound infections	Contact	Gloves + gown on entry	Private room or cohort
Bacterial pneumonia	Standard	Standard precautions	No special room

Chapter 29 — Obstructive Pulmonary Diseases (COPD Exacerbation, Asthma Attack)

Ch. 29

Obstructive Pulmonary Diseases — COPD Exacerbation, Status Asthmaticus

High Yield

Chapter 29 takes the foundation from Chapter 27 and applies it to acute exacerbation management. COPD exacerbation questions test priority interventions when a patient's condition deteriorates suddenly. Asthma attack questions test rescue inhaler priority (albuterol first, always) vs. maintenance inhaler sequencing. Status asthmaticus — a severe, life-threatening asthma attack unresponsive to bronchodilators — is a consistently tested Lewis Chapter 29 topic.

COPD exacerbation — O2 titrated, bronchodilators, steroids Rescue inhaler (albuterol/SABA) ALWAYS before maintenance (ICS) Status asthmaticus — emergency, IV bronchodilators, possible intubation Inhaler technique — shake, exhale, actuate on slow inhalation, hold 10s Spacer use — improves medication delivery for all MDIs Peak flow meter — <50% personal best = severe, seek emergency care Pursed-lip breathing — slows exhalation, reduces air trapping

Lewis Ch. 29 — Asthma Attack Priority

A patient with asthma is experiencing an acute attack with wheezing and dyspnea. The nurse notes the patient has both a rescue inhaler (albuterol) and a maintenance inhaler (fluticasone/salmeterol) at the bedside. Which action should the nurse take first?

A. Administer the maintenance inhaler first to reduce underlying inflammation
B. Administer the rescue inhaler (albuterol) immediately to achieve rapid bronchodilation
C. Apply supplemental O2 at 4 L/min and reassess in 15 minutes
D. Notify the healthcare provider before administering either inhaler

Correct: B. In an acute asthma attack, the short-acting beta-2 agonist (SABA — albuterol) is the first-line rescue medication. It produces bronchodilation within 5 minutes. Maintenance inhalers (ICS, LABA combinations like fluticasone/salmeterol) are for daily prevention, NOT acute relief — giving them during an attack wastes critical minutes and delays effective treatment. ⚠️ Why A is the trap: "Reduce inflammation" sounds logical during an attack. But corticosteroid inhalers take hours to days to work — they cannot relieve acute bronchospasm. Albuterol first, always, in every Lewis asthma question.

Chapter 30 — Critical Respiratory Conditions (PE, ARDS, Mechanical Ventilation)

Ch. 30

Pulmonary Embolism, ARDS, Mechanical Ventilation, Chest Trauma

🔥 Highest Acuity

Chapter 30 covers the most critical respiratory conditions — the ones where delayed nursing action causes patient deterioration within minutes. Pulmonary embolism questions test risk factors, recognition, and immediate interventions. ARDS questions test the defining criteria (PaO2/FiO2 ratio <300), nursing positioning (prone positioning), and what distinguishes ARDS from cardiogenic pulmonary edema. Mechanical ventilation questions test alarm priorities and what the nurse does when an alarm sounds.

PE classic triad — sudden dyspnea, pleuritic chest pain, hemoptysis PE — anticoagulation (heparin), O2, call HCP immediately ARDS — bilateral infiltrates, PaO2/FiO2 <300, non-cardiogenic ARDS positioning — PRONE positioning improves oxygenation Ventilator alarm — check patient first, then equipment, then call RT Tension pneumothorax — tracheal deviation AWAY from affected side Hemothorax vs pneumothorax assessment differences Chest tube care — never clamp without order, no dependent loops

Lewis Ch. 30 — Pulmonary Embolism Emergency

Clinical scenario: A patient is 3 days post-op following total hip replacement. The patient suddenly reports severe shortness of breath, sharp right-sided chest pain that worsens with deep breathing, and anxiety. HR is 122, RR 28, SpO2 88% on room air.

What is the nurse's immediate priority action?

A. Elevate the patient's right leg to promote venous return
B. Apply supplemental oxygen and notify the healthcare provider immediately
C. Perform a 12-lead ECG to assess for cardiac dysrhythmia
D. Administer prescribed anticoagulation and reassess in 30 minutes

Correct: B. This is a classic pulmonary embolism presentation — sudden onset dyspnea, pleuritic chest pain, tachycardia, hypoxemia in a post-op patient (immobility is a major PE risk factor). ABCs first: SpO2 88% requires immediate oxygen. Then notify the HCP — anticoagulation, imaging (CT pulmonary angiography), and further management require physician orders. The nurse acts on oxygenation independently and escalates simultaneously. ⚠️ Why A is dangerous: Elevating the leg of a patient with a suspected PE could dislodge a clot from the deep veins and worsen the embolism. Post-op patients with suspected PE should have leg elevation AVOIDED — not encouraged. This is a patient safety trap that Lewis Chapter 30 specifically tests.

The 6 Most Missed Lewis Respiratory Questions — And Why

Maintaining high O2 saturation in COPD patients

SpO2 95–100% in a COPD patient is dangerous, not reassuring. The target is 88–92%. Students see a "normal" SpO2 and choose "continue current care" — wrong answer every time.

→ Rule: COPD + SpO2 >94% on O2 = reduce the flow rate immediately.

Using a surgical mask for TB isolation

TB is AIRBORNE — requires an N95 respirator, not a surgical mask. Surgical masks are for DROPLET precautions (flu, meningitis). Students confuse the two because both involve respiratory protection.

→ TB = N95 + negative pressure room. Flu = surgical mask + private room preferred.

Giving the maintenance inhaler first in asthma attacks

Fluticasone, budesonide, fluticasone/salmeterol — these are prevention medications that take hours to work. They cannot treat an acute bronchospasm. Albuterol (SABA) always comes first.

→ Acute attack = SABA (albuterol) first. Maintenance = daily prevention only.

Elevating the leg in a suspected PE patient

Post-op patients with PE risk — elevating the affected leg can dislodge a DVT thrombus. Avoid leg elevation in suspected PE. O2 and immediate HCP notification come first.

→ PE suspect: O2 + notify HCP + anticoagulation as ordered. Do NOT manipulate the leg.

Confusing ARDS with cardiogenic pulmonary edema

Both cause bilateral infiltrates and hypoxemia. The key difference: ARDS is NON-cardiogenic — BNP is normal or low, PCWP is normal. Cardiogenic pulmonary edema has elevated BNP and PCWP. Lewis Chapter 30 tests this distinction with lab values.

→ ARDS: normal PCWP + normal BNP + PaO2/FiO2 <300. Pulmonary edema: ↑BNP + ↑PCWP.

Wrong thoracentesis positioning

Thoracentesis requires the patient to sit upright with arms resting on an overbed table — this opens intercostal spaces and allows fluid to pool at the lung bases. Students choose side-lying or supine positions, which are incorrect.

→ Thoracentesis: sitting upright, leaning slightly forward, arms on overbed table. Always.

High-Yield Respiratory Medications — Lewis Unit

Drug / Class	Lewis Chapter	Key NCLEX Nursing Point
Albuterol (SABA)	Ch. 27/29	Rescue inhaler — first in acute attack; side effects: tachycardia, tremor
Fluticasone (ICS)	Ch. 27/29	Maintenance only — rinse mouth after use to prevent oral candidiasis
Tiotropium (LAMA)	Ch. 27	Long-acting anticholinergic for COPD maintenance; dry mouth common
Prednisone/Methylprednisolone	Ch. 27/29	Monitor blood glucose — steroids raise BG; never stop abruptly long-term
Heparin IV	Ch. 30 (PE)	Monitor aPTT q6h; therapeutic 60–100 sec; antidote = protamine sulfate
tPA (alteplase)	Ch. 30 (PE)	Massive PE only; monitor for bleeding — no IM injections during infusion
Isoniazid (INH)	Ch. 28 (TB)	Monitor liver function; peripheral neuropathy — give pyridoxine (B6) with INH

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QWhich Lewis respiratory chapter is most important for the NCLEX?

All four chapters carry NCLEX weight, but Chapter 27 (COPD/COPD O2 management) and Chapter 30 (PE/ARDS) generate the most clinical judgment questions. COPD O2 targeting appears consistently in NCLEX physiological integrity. PE recognition in post-operative patients is a high-frequency NCLEX scenario. Prioritize these two chapters first, then build outward to 28 and 29.

QHow many questions should I practice before my Lewis respiratory exam?

Minimum 40–50 questions per chapter. For Chapter 27 (COPD — most missed) and Chapter 30 (PE/ARDS — most acute), aim for 60+ questions each. Work them in the 48 hours after each lecture, not the night before your exam. Consistent daily practice of 30–40 questions builds the pattern recognition that makes respiratory questions automatic rather than effortful on exam day.

QDoes the Lewis test bank include respiratory medication questions?

Yes — the Lewis 12th Edition test bank covers respiratory medications throughout Chapters 27–30, including albuterol/SABA rescue inhaler priority, ICS maintenance sequencing, steroid monitoring (blood glucose), heparin management in PE, and INH hepatotoxicity for TB. The medication questions are embedded in clinical scenarios, not isolated drug facts — which is exactly how exams test them.