PCCN Respiratory System

Question 1

Which arterial blood gas (ABG) finding is most consistent with respiratory acidosis?

Accepted Answer

pH 7.32, PaCO₂ 50 mmHg

Answer

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?

Accepted Answer

Fine crackles

Answer

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?

Accepted Answer

Facilitate diaphragmatic expansion

Answer

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?

Accepted Answer

Cuff leak or tracheostomy dislodgement

Answer

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?

Accepted Answer

SpO₂ level

Answer

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.

PCCN Exam Practice Test

PCCN Exam Practice Test

PCCN Respiratory System