Which of the following is not an oxygen delivery system used by paramedics?

The correct choice reflects the fact that hyperbaric chambers are not classified as a standard oxygen delivery system used in paramedic practice. Instead, hyperbaric chambers are specialized medical devices employed primarily in hyperbaric oxygen therapy. This therapy involves placing patients in a pressurized environment to treat specific conditions, such as decompression sickness or carbon monoxide poisoning, but not in routine pre-hospital care settings.

In contrast, nasal cannulas, simple face masks, and bag-valve masks are commonly used oxygen delivery systems in emergency medical services. Nasal cannulas provide a low flow of oxygen, making them suitable for patients who require mild to moderate respiratory support. Simple face masks deliver a higher concentration of oxygen and are often used for patients who need additional oxygen delivery without the invasive nature of more complex systems. Bag-valve masks are crucial for providing positive pressure ventilation in cases of severe respiratory distress or respiratory failure, allowing paramedics to quickly and effectively secure the airway and deliver oxygen to the patient.

Understanding the different applications and purposes of these devices is essential for paramedics as they assess and manage patients requiring oxygen therapy in the field.