NBCRNA Anesthesia Equipment and Technology 2

Question 1

Pulse oximetry measures oxygen saturation using which principle?

Accepted Answer

Differential light absorption by oxyhemoglobin and deoxyhemoglobin

Answer

Transcutaneous oxygen diffusion

Answer

Infrared CO2 analysis

Answer

Polarographic electrode measurement

Question 2

Which condition can cause falsely elevated pulse oximetry readings in a patient with carbon monoxide poisoning?

Accepted Answer

Carboxyhemoglobin absorbs light similarly to oxyhemoglobin at 660 nm

Answer

Low perfusion reduces signal accuracy

Answer

Methemoglobin causes a fixed reading of 85%

Answer

Nail polish interferes with both wavelengths equally

Question 3

The Bain circuit (Mapleson D modification) is a co-axial design where the inner tube carries what?

Accepted Answer

Fresh gas flow to the patient end

Answer

Exhaled gases to the APL valve

Answer

Scavenged gases

Answer

Humidified air

Question 4

The anesthesia vaporizer is classified as variable bypass because it does what?

Accepted Answer

Splits gas flow between a bypass chamber and a vaporizing chamber

Answer

Varies temperature to control vapor pressure

Answer

Uses electronic sensors to adjust output

Answer

Relies on carrier gas pressure changes

Question 5

When using a laryngeal mask airway (LMA), what is the maximum recommended cuff inflation volume for a size 4 LMA?

Accepted Answer

30 mL

Answer

60 mL

Answer

15 mL

Answer

50 mL

Question 6

The Venturi effect in anesthesia equipment is used primarily in which device?

Accepted Answer

Venturi oxygen mask to entrain room air

Answer

Circle breathing system CO2 absorber

Answer

Variable bypass vaporizer

Answer

Scavenging system interface