New York State Basic Emergency Medical Technician (EMT-B) Practice Exam

Which indicator is the BEST for assessing the quality of ventilations?

1. Chest expansion

2. Pupil size

3. Blood pressure

4. Skin color

The correct answer is: Chest expansion

Chest expansion is the best indicator for assessing the quality of ventilations because it directly reflects the effectiveness of air movement into the lungs. When ventilations are adequate, you would observe symmetrical and full expansion of the chest wall with each breath. This physical movement indicates that air is entering the lungs properly, allowing for effective gas exchange. Other indicators, such as pupil size, blood pressure, and skin color, do provide valuable information about a patient's overall condition and oxygenation status but do not specifically assess the mechanical aspect of ventilation. Pupil size can change due to various factors, including neurological responses or drug effects, while blood pressure reflects cardiovascular status. Skin color can indicate oxygenation levels, but it is not a direct assessment of how well the ventilation process is occurring. Therefore, focusing on chest expansion provides the most relevant and direct information regarding the quality of ventilations during airway management.