Which term describes cessation of breathing due to the lungs' failure to function effectively?

• A. Respiratory Distress
• B. Apnea
• C. Respiratory Failure
• D. Respiratory Arrest

Answer: (C)

This describes a state where the lungs no longer can meet the body's needs for oxygen and carbon dioxide removal. When the lungs fail to function effectively, gas exchange is inadequate, and ventilation/oxygenation fall below what the body requires—this is respiratory failure. It’s not simply that breathing has stopped; rather, the patient’s breathing is insufficient to sustain life-sustaining gas exchange, which is why signs like fatigue, confusion, low oxygen saturation, or rising carbon dioxide can be present.

In contrast, apnea is a complete absence of breathing, and respiratory arrest is the abrupt stoppage of breathing altogether. Respiratory distress refers to labored or difficult breathing with the patient still ventilating. So the term that best fits the description of insufficient gas exchange due to lung failure is respiratory failure.