EMT Equipment and Tools 2

Question 1

Which bag-valve-mask (BVM) reservoir volume is required to deliver approximately 21% oxygen without supplemental oxygen connected?

Accepted Answer

0% — it delivers room air only

Answer

Without supplemental oxygen, a BVM delivers approximately 21% oxygen (room air) regardless of reservoir bag presence.

Question 2

What is the primary purpose of the pop-off valve on a BVM device?

Accepted Answer

To release excess pressure and prevent barotrauma

Answer

The pop-off (pressure relief) valve releases at approximately 40 cmH2O to prevent lung barotrauma from excessive ventilation pressure.

Question 3

An EMT selects a non-rebreather mask for a patient. At what minimum liter-per-minute oxygen flow should it be set to keep the reservoir bag inflated?

Accepted Answer

10–15 LPM

Answer

Non-rebreather masks require 10–15 LPM to keep the reservoir bag adequately inflated and deliver 90–100% oxygen.

Question 4

Which device is BEST suited for maintaining a patent airway in an unconscious patient who has an intact gag reflex?

Accepted Answer

Nasopharyngeal airway (NPA)

Answer

The NPA is tolerated by patients with intact gag reflexes because it passes through the nose rather than stimulating the oropharynx.

Question 5

When sizing an oropharyngeal airway (OPA), the correct measurement is from the:

Accepted Answer

Corner of the mouth to the earlobe

Answer

An OPA is sized by measuring from the corner of the patient's mouth to the earlobe (or center of mouth to angle of jaw).

(EMT) Emergency Medical Technician Practice Test