Questions: How long should the second rescuer squeeze the bag-mask device when providing 2 -rescuer ventilation? CHOOSE THE CORRECT ANSWER 1 second 2 seconds 3 seconds 4 seconds

The answer is the first one: 1 second.

Explanation for each option:

1. 1 second: This is the correct answer. According to the American Heart Association (AHA) guidelines for CPR and emergency cardiovascular care, when providing ventilation with a bag-mask device, each breath should be delivered over 1 second. This ensures that the breath is delivered effectively without causing excessive pressure, which could lead to complications such as gastric inflation.

2. 2 seconds: This is incorrect. Delivering a breath over 2 seconds is too long and can increase the risk of gastric inflation and other complications.

3. 3 seconds: This is incorrect. Delivering a breath over 3 seconds is excessively long and can lead to ineffective ventilation and increased risk of complications.

4. 4 seconds: This is incorrect. Delivering a breath over 4 seconds is far too long and can result in ineffective ventilation and significant risk of complications.

Summary: The second rescuer should squeeze the bag-mask device for 1 second when providing 2-rescuer ventilation to ensure effective and safe delivery of breaths.