NLE Respiratory Nursing — Respiratory Assessment & DiagnosticsExam Answer Templates

Marks

1

Topic

Respiratory Physical Assessment

Difficulty

easy

Template Id

T1

Examiner Tip

Always state both the lower and upper limit of a normal range. Examiners look for precision — '12–20 breaths per minute' earns the mark; '12–18' or '15–20' does not.

Model Answer

The normal adult respiratory rate is 12 to 20 breaths per minute.

Question Type

very_short_answer

Answer Structure

• Line 1: State the exact normal range with correct units [1 mark]

Scoring Breakdown

Common Mark Deductions

• Writing only '12' or only '20' without giving the full range
• Writing 'per hour' instead of 'per minute'
• Giving the pediatric rate instead of the adult rate

Key Phrases To Include

• 12–20 breaths per minute
• adult

Marks

1

Topic

Chest Tubes and Water-Seal Drainage

Difficulty

easy

Template Id

T2

Examiner Tip

The word 'continuous' is the trigger. Examiners specifically test the difference between normal intermittent bubbling (air escaping from a pneumothorax) and abnormal continuous bubbling (air leak). Make sure you use the term 'air leak' explicitly.

Model Answer

Continuous bubbling in the water-seal chamber indicates an air leak in the chest tube system.

Question Type

very_short_answer

Answer Structure

• Line 1: Identify the clinical finding and its significance in one concise statement [1 mark]

Scoring Breakdown

Common Mark Deductions

• Confusing continuous bubbling with intermittent bubbling (which can be normal)
• Stating it is 'normal' — continuous bubbling is always abnormal
• Not specifying which chamber the bubbling refers to

Key Phrases To Include

• air leak
• water-seal chamber
• continuous bubbling

Marks

1

Topic

Oxygen Therapy

Difficulty

easy

Template Id

T3

Examiner Tip

This is one of the most high-yield NLE facts in respiratory nursing. Always pair the 88–92% target with the reason (hypoxic drive), especially in higher-mark questions.

Model Answer

The target SpO2 for a COPD patient receiving supplemental oxygen is 88–92%.

Question Type

very_short_answer

Answer Structure

• Line 1: State the specific percentage range for COPD patients [1 mark]

Scoring Breakdown

Common Mark Deductions

• Writing the standard target of 94–98% or 95–100% — this is incorrect for COPD
• Not specifying the context of COPD (the range is different for other patients)

Key Phrases To Include

• 88–92%
• COPD
• oxygen therapy

Marks

2

Topic

Auscultation of Breath Sounds

Difficulty

easy

Template Id

T4

Examiner Tip

Structure as a two-part contrast. Examiners award one mark per breath sound. Always link each sound to its pathophysiology (fluid vs. narrowed airway) and at least one clinical condition.

Model Answer

Crackles (rales) are discontinuous, popping or crackling sounds caused by fluid in the alveoli or collapsed alveoli reopening; they are heard in pneumonia and pulmonary edema. Wheezes are continuous, high-pitched, musical sounds caused by narrowed or obstructed airways; they are the hallmark of asthma and COPD.

Question Type

short_answer

Answer Structure

• Point 1: Define crackles — sound quality (discontinuous, popping) + cause + clinical condition [1 mark]
• Point 2: Define wheezes — sound quality (continuous, high-pitched, musical) + cause + clinical condition [1 mark]

Scoring Breakdown

Common Mark Deductions

• Reversing the descriptions — calling wheezes 'discontinuous' or crackles 'musical'
• Listing only the sound without mentioning the clinical condition
• Using imprecise language such as 'wet sound' or 'dry sound' without proper clinical terminology

Key Phrases To Include

• discontinuous
• popping
• crackles
• continuous
• high-pitched
• musical
• wheezes
• narrowed airways
• pneumonia
• pulmonary edema
• asthma
• COPD

Marks

2

Topic

Oxygen Therapy — Delivery Devices

Difficulty

medium

Template Id

T5

Examiner Tip

Oxygen delivery device questions almost always require BOTH the FiO2 AND the corresponding flow rate. Memorize them as pairs and write them as pairs.

Model Answer

A nasal cannula delivers approximately 24–44% FiO2 at flow rates of 1–6 L/min. The maximum recommended flow rate is 6 L/min; flows above 6 L/min do not meaningfully increase FiO2 but dry the nasal mucosa, requiring humidification above 4 L/min.

Question Type

short_answer

Answer Structure

• Point 1: State the FiO2 range (24–44%) and flow rate range (1–6 L/min) [1 mark]
• Point 2: State the maximum flow rate limit (6 L/min) and the clinical rationale (mucosal drying, no FiO2 benefit) [1 mark]

Scoring Breakdown

Common Mark Deductions

• Stating the flow can go to 10 L/min — this applies to a simple face mask, not nasal cannula
• Omitting the humidification recommendation
• Giving only the FiO2 range without the corresponding flow rates

Key Phrases To Include

• 24–44%
• 1–6 L/min
• nasal cannula
• mucosal drying
• humidification
• maximum 6 L/min

Marks

2

Topic

Arterial Blood Gas Analysis

Difficulty

medium

Template Id

T6

Examiner Tip

Always show your ROME steps even in a 2-mark question. Writing 'ROME: Respiratory Opposite — pH down, CO2 up → respiratory acidosis' takes 5 seconds and earns full marks even if your final label has a minor error.

Model Answer

Using the ROME method: The pH of 7.30 is below normal (7.35–7.45), indicating acidosis. The PaCO2 of 50 mmHg is elevated (normal 35–45 mmHg). Since CO2 is high and pH is low, these move in opposite directions — this is consistent with Respiratory (ROME: Respiratory Opposite). The HCO3 of 24 mEq/L is within normal range (22–26 mEq/L), so there is no metabolic compensation. Interpretation: Respiratory acidosis, uncompensated.

Question Type

short_answer

Answer Structure

• Step 1: Assess pH — state whether it is acidotic or alkalotic [0.5 mark]
• Step 2: Assess PaCO2 — state whether it is elevated or decreased, and identify as respiratory component [0.5 mark]
• Step 3: Assess HCO3 — state whether it is within normal range or compensating [0.5 mark]
• Step 4: State the final interpretation with compensation status [0.5 mark]

Scoring Breakdown

Common Mark Deductions

• Failing to state the compensation status (uncompensated vs. partially compensated)
• Calling it 'metabolic acidosis' because the pH is low — the key is to check PaCO2 first
• Skipping the stepwise reasoning and just writing the answer — examiners reward the process

Key Phrases To Include

• ROME method
• pH 7.30 — acidosis
• PaCO2 50 — elevated
• HCO3 24 — normal
• respiratory acidosis
• uncompensated

Marks

2

Topic

Chest Tubes and Water-Seal Drainage

Difficulty

medium

Template Id

T7

Examiner Tip

The '3 sides' detail is a classic NLE patient-safety question. Examiners specifically look for this. If you write 'four sides,' you not only lose the mark — it signals a safety knowledge gap. Always include the rationale.

Model Answer

The priority nursing intervention when a chest tube is accidentally dislodged from the chest is to immediately cover the insertion site with a sterile occlusive dressing taped on three sides only. Taping on three sides creates a flutter-valve effect: it allows air to escape on expiration but prevents air from entering on inspiration, reducing the risk of tension pneumothorax. The nurse must then notify the physician immediately.

Question Type

short_answer

Answer Structure

• Action 1: Immediately cover the site with a sterile occlusive dressing taped on THREE sides — state the number of sides [1 mark]
• Rationale + follow-up: Explain the flutter-valve effect / why NOT four sides; notify physician [1 mark]

Scoring Breakdown

Common Mark Deductions

• Writing 'tape on four sides' — this is a critical safety error and will lose the mark
• Not explaining why three sides (no rationale = no mark for the second criterion)
• Forgetting to mention physician notification

Key Phrases To Include

• sterile occlusive dressing
• three sides
• flutter-valve effect
• tension pneumothorax
• notify physician

Marks

3

Topic

Pulmonary Function Tests

Difficulty

medium

Template Id

T8

Examiner Tip

Always anchor your answer to the FEV1/FVC ratio — this is the key discriminator. State the number (<70% for obstructive). Examiners reward numerical precision in PFT questions.

Model Answer

In obstructive lung disease, airflow out of the lungs is impaired. The FEV1 (forced expiratory volume in 1 second) is reduced while the FVC (forced vital capacity) may be normal or slightly reduced, resulting in a decreased FEV1/FVC ratio of less than 70%. Example: asthma and COPD. In restrictive lung disease, the lung volumes are reduced due to stiff lungs or chest-wall restriction. Both FEV1 and FVC are reduced proportionally, so the FEV1/FVC ratio remains normal or is even elevated (>70%). Example: pulmonary fibrosis or chest-wall deformity.

Question Type

short_answer

Answer Structure

• Point 1: Define obstructive pattern — reduced FEV1/FVC ratio (<70%), airflow limitation — with example [1 mark]
• Point 2: Define restrictive pattern — reduced FVC, normal/elevated FEV1/FVC ratio — with example [1 mark]
• Point 3: Provide a clear contrast or clinical implication (e.g., reversibility in asthma vs. COPD, or mechanism) [1 mark]

Scoring Breakdown

Common Mark Deductions

• Reversing the patterns — saying restrictive disease has a reduced FEV1/FVC ratio
• Giving examples only without explaining the PFT findings
• Not giving examples at all (the question asks for one of each)

Key Phrases To Include

• FEV1/FVC ratio
• less than 70%
• obstructive
• reduced FVC
• normal or elevated ratio
• restrictive
• asthma
• COPD
• pulmonary fibrosis

Marks

3

Topic

Arterial Blood Gas Analysis

Difficulty

medium

Template Id

T9

Examiner Tip

Show each step explicitly and write the normal value next to the patient's value for comparison. E.g., 'PaCO2: patient = 30 mmHg, normal = 35–45 mmHg → LOW.' This demonstrates systematic clinical thinking.

Model Answer

The ROME method is a systematic approach to ABG interpretation: Step 1 (pH): Assess the pH. pH 7.50 is above 7.45 — this indicates alkalosis. Step 2 (Respiratory, PaCO2): Assess PaCO2. Normal is 35–45 mmHg. PaCO2 of 30 mmHg is low. Using ROME (Respiratory Opposite): pH is high and PaCO2 is low — they move in opposite directions. This is consistent with a respiratory cause. Step 3 (Metabolic, HCO3): Assess HCO3. Normal is 22–26 mEq/L. HCO3 of 24 mEq/L is within normal range — no metabolic compensation. Step 4 (Compensation): Since HCO3 is normal, there is no compensation. Final Interpretation: Respiratory alkalosis, uncompensated. This pattern is seen in hyperventilation, anxiety, pain, or early sepsis.

Question Type

short_answer

Answer Structure

• Step 1: Assess pH and label as acidosis or alkalosis [0.5 mark]
• Step 2: Assess PaCO2 with normal range stated; apply ROME Respiratory Opposite [1 mark]
• Step 3: Assess HCO3 with normal range stated; determine if compensation is present [0.5 mark]
• Step 4: State the final interpretation with compensation status and give one clinical cause [1 mark]

Scoring Breakdown

Common Mark Deductions

• Describing ROME without actually applying it to the given values
• Forgetting to state normal reference ranges alongside the given values
• Skipping the compensation assessment step

Key Phrases To Include

• ROME
• Respiratory Opposite
• Metabolic Equal
• pH 7.50 — alkalosis
• PaCO2 30 — low
• HCO3 24 — normal
• uncompensated
• respiratory alkalosis
• hyperventilation

Marks

5

Topic

Oxygen Therapy — Delivery Devices

Difficulty

hard

Template Id

T10

Examiner Tip

Use a structured format with numbered points and sub-bullets. In a 5-mark question, examiners expect approximately one mark per device plus a synthesis point. Always end with the COPD clinical priority — this is a signature NLE high-yield fact.

Model Answer

Oxygen is a drug and its delivery must be matched to the patient's clinical need. The four major delivery devices are: 1. Nasal Cannula - FiO2: 24–44% - Flow rate: 1–6 L/min - Indication/Consideration: Used for mild to moderate hypoxemia. It is comfortable, allows the patient to eat and talk, and is well-tolerated for long-term use. Flows above 6 L/min do not meaningfully raise FiO2 and cause mucosal drying; humidification should be added at flows above 4 L/min. 2. Simple Face Mask - FiO2: 40–60% - Flow rate: 5–10 L/min - Indication/Consideration: Used for moderate hypoxemia. A minimum flow of 5 L/min is required to flush exhaled CO2 from the mask and prevent rebreathing. Flows below 5 L/min are contraindicated. 3. Non-Rebreather Mask (NRM) - FiO2: Approximately 80–95% - Flow rate: 10–15 L/min - Indication/Consideration: Used for severe hypoxemia and emergencies. The reservoir bag must remain inflated at all times during inspiration. It has one-way valves that prevent exhaled air from re-entering the bag. It is the highest FiO2 achievable with a low-flow device. 4. Venturi Mask - FiO2: Fixed, precise concentrations (24%, 28%, 31%, 35%, 40%) - Flow rate: Varies by color-coded diluter attached - Indication/Consideration: It is a high-flow, fixed-performance system that delivers a precise, consistent FiO2 regardless of the patient's breathing pattern. It is the device of CHOICE for COPD patients who require controlled, low-concentration oxygen to avoid suppressing the hypoxic drive and causing CO2 retention. Nursing Priority: In COPD, titrate oxygen to a SpO2 target of 88–92% using the Venturi mask. Never withhold oxygen from a hypoxic patient, but monitor closely for signs of CO2 narcosis (drowsiness, confusion, decreased respiratory rate).

Question Type

long_answer

Answer Structure

• Introduction: State that oxygen is a drug and must be matched to clinical need [0.5 mark]
• Device 1 — Nasal cannula: FiO2, flow rate, indication, max flow/humidification consideration [1 mark]
• Device 2 — Simple face mask: FiO2, flow rate, minimum 5 L/min to flush CO2 [1 mark]
• Device 3 — Non-rebreather mask: FiO2, flow rate, keep reservoir bag inflated [1 mark]
• Device 4 — Venturi mask: precise fixed FiO2, device of choice for COPD, hypoxic drive rationale [1 mark]
• Summary nursing priority: COPD target SpO2 88–92%, monitor for CO2 narcosis [0.5 mark]

Scoring Breakdown

Common Mark Deductions

• Mixing up the FiO2 ranges — especially confusing NRM with simple mask
• Not mentioning the minimum 5 L/min for simple face mask
• Omitting the COPD SpO2 target or not explaining why Venturi mask is preferred for COPD
• Not mentioning that the NRM reservoir bag must stay inflated
• Listing devices without linking clinical indications to each

Key Phrases To Include

• 24–44%
• 40–60%
• 80–95%
• 10–15 L/min
• minimum 5 L/min
• reservoir bag inflated
• Venturi mask
• fixed FiO2
• COPD
• 88–92%
• hypoxic drive
• CO2 retention
• humidification

Marks

5

Topic

Chest Tubes and Water-Seal Drainage

Difficulty

hard

Template Id

T11

Examiner Tip

Organize your answer under clear Roman numeral sub-headings (I. Chambers, II. Normal Findings, III. Interventions). This structure guides the examiner's eye directly to each scorable point. Always include rationale with each intervention — in nursing exams, knowing WHAT to do is worth partial credit; knowing WHY earns full marks.

Model Answer

A three-chamber water-seal drainage system is used to evacuate air, fluid, blood, or pus from the pleural space and restore negative intrapleural pressure to re-expand the lung. I. The Three Chambers 1. Collection Chamber (first chamber): Collects all drainage from the pleural space. The nurse monitors and records the amount, color, and rate of drainage. The level is marked with the date and time on the outside of the chamber at regular intervals. 2. Water-Seal Chamber (second chamber): Acts as a one-way valve. Air exits the pleural space through this chamber but cannot re-enter. It is filled with 2 cm of sterile water. The water-seal prevents atmospheric air from entering the pleural space. 3. Suction-Control Chamber (third chamber): Regulates the amount of suction applied to the pleural space. In a wet system, suction level is controlled by the water level; in a dry system, it is set by a dial. II. Expected Normal Findings - Tidaling (fluctuation of water in the water-seal chamber with respiration) is NORMAL and indicates the system is patent. Absence of tidaling may indicate lung re-expansion or tube obstruction. - Intermittent bubbling in the water-seal chamber is normal during early pneumothorax drainage when air is being evacuated. - CONTINUOUS bubbling in the water-seal chamber is ABNORMAL and indicates an air leak — the nurse must check all connections and inspect the insertion site immediately. III. Priority Nursing Interventions 1. Keep the drainage system BELOW the level of the chest at all times: This prevents backflow of drainage into the pleural space, which could cause infection or tension pneumothorax. 2. Do NOT routinely clamp the chest tube: Clamping while an air leak is present traps air in the pleural space and can cause a life-threatening tension pneumothorax. Clamping is done only per specific physician order. Additional interventions include: encouraging deep breathing and incentive spirometry to promote lung re-expansion; monitoring for signs of tension pneumothorax (tracheal deviation, absent breath sounds, hypotension, distended neck veins); and keeping a bottle of sterile water and tube clamps at the bedside for emergencies.

Question Type

long_answer

Answer Structure

• Section I — Three chambers: describe each (collection, water-seal, suction-control) with function [1.5 marks]
• Section II — Normal findings: tidaling is normal, define it; intermittent bubbling normal in pneumothorax drainage; continuous bubbling = air leak [1.5 marks]
• Section III — Two priority nursing interventions: keep below chest level + rationale; do not clamp + rationale [2 marks]

Scoring Breakdown

Common Mark Deductions

• Describing only two of the three chambers
• Stating that tidaling is abnormal — this is incorrect
• Confusing intermittent and continuous bubbling
• Recommending routine clamping — this is a patient safety error
• Giving interventions without rationale

Key Phrases To Include

• collection chamber
• water-seal chamber
• suction-control chamber
• tidaling
• normal finding
• continuous bubbling
• air leak
• below chest level
• no routine clamping
• tension pneumothorax

Marks

2

Topic

Auscultation of Breath Sounds and Nursing Diagnosis

Difficulty

medium

Template Id

T12

Examiner Tip

Nursing diagnosis questions in the NLE require NANDA language. Always write: Problem + 'related to' (etiology) + 'as evidenced by' (defining characteristics). A medical diagnosis written in the nursing diagnosis slot earns zero marks for that criterion.

Model Answer

Two adventitious breath sounds heard in patients with heart failure are: 1. Crackles (rales) — discontinuous, popping sounds caused by fluid in the alveoli, heard bilaterally at the lung bases. 2. Wheezes — continuous, high-pitched sounds caused by narrowed airways due to pulmonary edema (sometimes called 'cardiac asthma'). The priority nursing diagnosis is: Impaired Gas Exchange related to alveolar-capillary fluid accumulation as evidenced by bilateral crackles, decreased SpO2, and dyspnea.

Question Type

short_answer

Answer Structure

• Point 1: Name and describe two correct adventitious breath sounds heard in heart failure [1 mark]
• Point 2: State the NANDA-appropriate nursing diagnosis using PES format [1 mark]

Scoring Breakdown

Common Mark Deductions

• Naming breath sounds without describing them
• Writing a medical diagnosis ('heart failure') instead of a nursing diagnosis
• Not using PES format for the nursing diagnosis

Key Phrases To Include

• crackles
• bilateral
• lung bases
• wheezes
• Impaired Gas Exchange
• PES format
• related to
• as evidenced by

Marks

2

Topic

Arterial Blood Gas Analysis — Pre-procedure Care

Difficulty

medium

Template Id

T13

Examiner Tip

Always state what POSITIVE means in clinical terms — 'palm flushes within 5–7 seconds, indicating adequate ulnar collateral flow.' Examiners expect you to interpret the test, not just describe it mechanically.

Model Answer

The Allen test is a bedside assessment performed to confirm that adequate collateral circulation exists in the hand via the ulnar artery before the radial artery is punctured for ABG sampling. Procedure: The nurse compresses both the radial and ulnar arteries simultaneously until the palm blanches, then releases only the ulnar artery. If the palm flushes pink within 5–7 seconds, the Allen test is POSITIVE (adequate collateral circulation is present) and radial puncture may safely proceed. Rationale: If the radial artery is damaged or goes into spasm after puncture, the ulnar artery provides collateral blood supply to the hand, preventing ischemia. A negative Allen test (slow or absent flushing) indicates poor collateral flow and the radial site should be avoided.

Question Type

short_answer

Answer Structure

• Part 1: Define the Allen test and its purpose [0.5 mark]
• Part 2: Describe the procedure briefly and what a positive result means [0.5 mark]
• Part 3: Explain the clinical rationale — why it matters before radial puncture [1 mark]

Scoring Breakdown

Common Mark Deductions

• Describing only the procedure without explaining the rationale
• Confusing positive and negative results (positive = good flow = safe to proceed)
• Not mentioning the ulnar artery as the collateral vessel

Key Phrases To Include

• Allen test
• collateral circulation
• ulnar artery
• radial artery
• blanch
• flush pink
• positive result
• ischemia prevention
• ABG sampling

Marks

3

Topic

Respiratory Physical Assessment — Inspection

Difficulty

medium

Template Id

T14

Examiner Tip

The 5 g/dL deoxygenated hemoglobin fact is the key to earning full marks on cyanosis questions. This number is exactly the kind of specific clinical fact that examiners use to distinguish students who truly understand the physiology.

Model Answer

Two late signs of hypoxemia observed on physical assessment are: 1. Central Cyanosis: This refers to a bluish discoloration of the lips, tongue, and oral mucous membranes. It is considered a LATE sign because it only becomes visible when approximately 5 grams per deciliter (g/dL) of deoxygenated hemoglobin is present in the blood. This means significant oxygen desaturation must occur before cyanosis is visually detectable. In patients with anemia, cyanosis may never appear even in severe hypoxemia because there is not enough hemoglobin to reach the 5 g/dL threshold. 2. Digital Clubbing: This is a painless widening and rounding of the fingertips with a loss of the normal angle between the nail and the nail bed (Schamroth's sign). Clubbing is a LATE sign because it develops gradually over months to years of chronic hypoxemia, reflecting long-term tissue ischemia and compensatory changes in peripheral tissue perfusion. Clinical Implication: Because both signs appear late, nurses must rely on early indicators — such as rising respiratory rate, restlessness, use of accessory muscles, and falling SpO2 — to detect hypoxemia before these late signs manifest.

Question Type

short_answer

Answer Structure

• Sign 1: Name central cyanosis, describe it, explain why it is late (5 g/dL deoxygenated Hgb threshold) [1 mark]
• Sign 2: Name clubbing, describe it, explain why it is late (develops over months to years of chronic hypoxemia) [1 mark]
• Clinical implication: State what early signs nurses should monitor instead [1 mark]

Scoring Breakdown

Common Mark Deductions

• Describing peripheral cyanosis (fingers only) instead of central cyanosis (lips, tongue) — peripheral can have other causes
• Not explaining the physiological reason why each sign is late
• Omitting the clinical implication of what to monitor early

Key Phrases To Include

• central cyanosis
• 5 g/dL deoxygenated hemoglobin
• late sign
• digital clubbing
• chronic hypoxemia
• early warning signs
• SpO2
• accessory muscles

Marks

5

Topic

Oxygen Therapy — COPD Management

Difficulty

hard

Template Id

T15

Examiner Tip

Case-study questions reward integration of knowledge. Examiners are looking for NANDA diagnosis, clinical rationale, specific numbers (88–92%), device knowledge, and monitoring parameters — all in one organized answer. Use Roman numeral sections to organize your response and signal to the examiner that you have covered every aspect of the question. Referencing RA 9173 in practice-related questions signals professional nursing awareness.

Model Answer

I. Assessment and Priority The priority nursing problem for this patient is Impaired Gas Exchange related to airflow obstruction and CO2 retention, as evidenced by respiratory distress. According to Maslow's Hierarchy of Needs, oxygenation is a physiological priority and must be addressed first. Under RA 9173 (Philippine Nursing Act of 2002), the nurse has the professional obligation to implement safe and evidence-based oxygen therapy. II. Device of Choice: Venturi Mask The Venturi mask is the device of choice for COPD patients requiring supplemental oxygen. It is a high-flow, fixed-performance device that delivers a precise, known FiO2 (commonly 24%, 28%, 31%, 35%, or 40%) regardless of the patient's respiratory rate or tidal volume. This precision is critical in COPD management. III. Target SpO2: 88–92% For COPD patients, oxygen is titrated to a SpO2 target of 88–92% — NOT the standard 94–98%. This lower target is intentional. Rationale — Hypoxic Drive: Many patients with chronic hypercapnia (COPD Type B/Blue Bloater pattern) become accustomed to elevated PaCO2 levels. Their primary respiratory drive shifts from the normal CO2 stimulus to a hypoxic drive (low PaO2 stimulates respiration). If excessive oxygen is administered and SpO2 rises above 92–94%, this hypoxic drive is blunted, leading to reduced respiratory effort, further CO2 accumulation, and CO2 narcosis. Important: Never completely withhold oxygen from a hypoxic COPD patient — uncontrolled hypoxemia is immediately life-threatening. The goal is controlled, titrated oxygen, not zero oxygen. IV. Monitoring Parameters 1. SpO2 — Continuous pulse oximetry; target 88–92%. Adjust oxygen flow if SpO2 drops below 88% or rises above 94%. 2. ABG — Obtain baseline ABG and repeat after 30–60 minutes to monitor PaCO2 trends. A rising PaCO2 with decreasing consciousness indicates CO2 narcosis. 3. Level of consciousness — Monitor for early signs of CO2 narcosis: drowsiness, headache, confusion, asterixis (flapping tremor). These indicate hypercapnic encephalopathy. 4. Respiratory rate and work of breathing — Monitor for decreasing respiratory rate (a warning sign of CO2 retention and impending respiratory failure). 5. Oxygen delivery system — Ensure the correct color-coded Venturi diluter is attached for the prescribed FiO2. Verify connections and mask position. V. Documentation Document the oxygen device, flow rate, FiO2, SpO2 baseline and ongoing values, ABG results, and patient's mental status changes per shift and as needed.

Question Type

case_study

Answer Structure

• Section I: Identify priority nursing problem using NANDA + Maslow rationale + RA 9173 reference [0.5 mark]
• Section II: State Venturi mask as device of choice with explanation of fixed/precise FiO2 delivery [1 mark]
• Section III: State 88–92% SpO2 target + explain hypoxic drive rationale + safety note about not withholding O2 [1.5 marks]
• Section IV: List at least 4 specific monitoring parameters with clinical rationale for each [1.5 marks]
• Section V: Mention documentation responsibilities [0.5 mark]

Scoring Breakdown

Common Mark Deductions

• Prescribing a non-rebreather mask for COPD — this is a critical error that demonstrates misunderstanding of COPD management
• Stating SpO2 target as 94–98% instead of 88–92%
• Not explaining the hypoxic drive mechanism
• Suggesting oxygen be completely withheld — this is a dangerous and incorrect recommendation
• Listing monitoring parameters without clinical rationale
• Not using nursing process or nursing diagnosis language in a case-study question

Key Phrases To Include

• Venturi mask
• fixed FiO2
• 88–92%
• hypoxic drive
• CO2 retention
• CO2 narcosis
• titrated oxygen
• ABG monitoring
• level of consciousness
• Impaired Gas Exchange
• Maslow
• RA 9173