PCCN Respiratory System — Questions and Answers
Question 1: Which arterial blood gas (ABG) finding is most consistent with respiratory acidosis?
- pH 7.50, PaCO₂ 30 mmHg
- pH 7.32, PaCO₂ 50 mmHg (Correct answer)
- pH 7.48, HCO₃ 30 mEq/L
- pH 7.36, PaCO₂ 40 mmHg
Correct answer: pH 7.32, PaCO₂ 50 mmHg
Respiratory acidosis is characterized by a low pH (acidic) and an elevated PaCO₂ (carbon dioxide, which is an acid). In this option, the pH of 7.32 is acidic (normal 7.35-7.45), and the PaCO₂ of 50 mmHg is elevated (normal 35-45 mmHg). This combination directly indicates respiratory acidosis.
Question 2: Which breath sound is most commonly associated with fluid in the alveoli?
- Rhonchi
- Stridor
- Fine crackles (Correct answer)
- Wheezes
Correct answer: Fine crackles
Fine crackles, also known as rales, are short, high-pitched, popping sounds heard during inspiration. They are produced when collapsed alveoli or small airways suddenly open, often due to the presence of fluid. This makes them a characteristic finding in conditions like pulmonary edema or pneumonia where fluid accumulates in the alveoli.
Question 3: What is the primary reason to place a patient in high Fowler’s position during a respiratory distress episode?
- Reduce blood pressure
- Facilitate diaphragmatic expansion (Correct answer)
- Prevent aspiration
- Improve venous return
Correct answer: Facilitate diaphragmatic expansion
Placing a patient in high Fowler's position (sitting upright at 60-90 degrees) allows gravity to pull the abdominal organs away from the diaphragm. This reduces pressure on the diaphragm, enabling it to move more freely and expand the lungs more effectively. This position optimizes lung expansion and improves ventilation, thereby easing respiratory distress.
Question 4: A nurse assesses a tracheostomy patient and notes a sudden drop in oxygen saturation and the sound of air escaping. What should the nurse suspect?
- Tracheal stenosis
- Mucus plug
- Cuff leak or tracheostomy dislodgement (Correct answer)
- Bronchospasm
Correct answer: Cuff leak or tracheostomy dislodgement
A sudden drop in oxygen saturation combined with the sound of air escaping around a tracheostomy tube strongly suggests a problem with the cuff or the tube's position. A cuff leak means air is escaping past the cuff instead of going into the lungs, reducing ventilation. Dislodgement means the tube is no longer correctly positioned in the trachea, leading to ineffective ventilation and air leakage, both requiring immediate intervention.
Question 5: Which parameter is most reliable in evaluating the effectiveness of oxygen therapy?
- Respiratory rate
- Lung sounds
- SpO₂ level (Correct answer)
- Capillary refill
Correct answer: SpO₂ level
The SpO₂ (pulse oximetry) level directly measures the percentage of hemoglobin saturated with oxygen in the arterial blood. It provides an immediate and objective assessment of oxygenation status and the effectiveness of oxygen therapy. While other parameters like respiratory rate and lung sounds are important, SpO₂ offers a direct physiological measure of how well the body is being oxygenated.
Question 6: A patient with a history of COPD presents with confusion and somnolence. ABG results show pH 7.28, PaCO₂ 60 mmHg. What is the best initial nursing action?
- Apply a non-rebreather mask
- Encourage deep breathing and coughing
- Prepare for intubation
- Notify the provider and consider BiPAP (Correct answer)
Correct answer: Notify the provider and consider BiPAP
The ABG results (pH 7.28, PaCO₂ 60 mmHg) indicate severe respiratory acidosis with hypoventilation, consistent with COPD exacerbation and CO₂ retention, leading to confusion and somnolence. BiPAP (Bilevel Positive Airway Pressure) is a non-invasive ventilation method that can help improve ventilation, reduce PaCO₂, and prevent the need for intubation. Notifying the provider is crucial for medical orders and further management.
Question 7: Which condition is characterized by a sudden onset of sharp chest pain and dyspnea, often associated with a pneumothorax?
- Pulmonary edema
- Pleural effusion
- Pulmonary embolism
- Pneumothorax (Correct answer)
Correct answer: Pneumothorax
A pneumothorax is the presence of air in the pleural space, which causes the lung to collapse. This condition typically presents with a sudden onset of sharp, pleuritic chest pain (pain that worsens with breathing) and dyspnea (shortness of breath) as the lung's ability to expand is compromised. The other options have different primary presentations.
Question 8: A patient with asthma is experiencing wheezing and shortness of breath. Which medication should the nurse expect to administer first?
- Inhaled corticosteroid
- Oral leukotriene inhibitor
- Albuterol nebulizer (Correct answer)
- Montelukast
Correct answer: Albuterol nebulizer
Albuterol is a short-acting beta-2 agonist (SABA) and a bronchodilator. It works rapidly to relax the smooth muscles of the airways, opening them up and relieving acute symptoms like wheezing and shortness of breath during an asthma exacerbation. It is considered a 'rescue' medication and is the first-line treatment for acute asthma attacks.
Question 9: Which finding in a patient with pneumonia requires immediate intervention?
- Productive cough with yellow sputum
- Respiratory rate of 24 breaths per minute
- New-onset confusion and restlessness (Correct answer)
- Temperature of 101.2°F (38.4°C)
Correct answer: New-onset confusion and restlessness
New-onset confusion and restlessness in a patient with pneumonia can indicate hypoxemia (low oxygen levels) or developing sepsis, especially in older adults. These are signs of worsening respiratory status or systemic compromise that require immediate assessment and intervention to prevent further deterioration. Other findings like cough and fever are expected with pneumonia but are less immediately concerning than acute neurological changes.
PCCN Respiratory System
Which arterial blood gas (ABG) finding is most consistent with respiratory acidosis?