New York State Emergency Medical Technician (EMT) Practice Exam

When treating a chest injury, what vital sign change should raise immediate concern?

1. Increased heart rate

2. Normal respiratory rate

3. High blood pressure

4. Low oxygen saturation

The correct answer is: Low oxygen saturation

When managing a chest injury, low oxygen saturation is a critical concern because it indicates that the body is not receiving enough oxygen. This can signify potential complications such as a pneumothorax or hemothorax, which could lead to life-threatening respiratory failure. Oxygen saturation levels are a direct measurement of how effectively oxygen is being transported in the bloodstream, and a reading below the normal range (typically 95-100%) can alert EMS providers to the urgency of the situation. In a patient with a chest injury, maintaining adequate oxygenation is essential. If oxygen saturation drops, it often necessitates immediate interventions, such as supplemental oxygen or further evaluation and treatment for possible underlying conditions. Thus, recognizing low oxygen saturation as a vital sign that warrants immediate concern is crucial for ensuring patient safety and effective treatment.