Basic Life Support (BLS) Practice Exam

Rescue breaths delivered during CPR when using an endotracheal tube should occur every 6 seconds. This frequency is based on the guidelines that emphasize the importance of providing adequate ventilation while also allowing time for chest compressions. The 6-second interval allows for sufficient oxygen delivery to the lungs without interrupting the circulation too frequently, which is critical to maintaining blood flow to vital organs during CPR.

In the context of CPR effectiveness, the balance between chest compressions and ventilations is essential; compressions should remain the priority, but adequate breaths must also be provided. This interval supports the physiological need for oxygen and helps prevent potential complications associated with providing breaths too quickly, such as hyperventilation.