Equipment

Question 1

The Murphy eye if present on the ETT will minimize the risk of?

Answer 1

Patient asphyxiation- in the event the end hole is blocked

Question 2

What are 3 reasons to use a cuffed endotracheal tube?

Answer 2

1. Prevent leakage of air & gas around the tube 2. Minimize risk of aspiration 3. Prevent patient from breathing room air around tube which will dilute anesthetic gases

Question 3

How do you measure for the correct length for an endotracheal tube?

Answer 3

The distance between the most rostral aspect of the mouth and the thoracic inlet. *Excessive length is a risk that only one lung will be infused with O2 or mechanical dead space will increase leading to hypoxemia.

Question 4

1. What is the equation for calculating the amount of liter (L) present in an oxygen tank? 2. At a flow rate of 1L/min how long will a full E tank last?

Answer 4

1. Multiply the pressure (in psi) by 0.3. Full E Tank at 2200psi will contain 660L of oxygen 2. 660min or 11 hours

Question 5

What does the pressure reducing valve lower the pressure of gas to?

Answer 5

40-50psi *line pressure gauge if present will verify that the pressure has been dropped to 40-50psi

Question 6

The flowmeter reduces the pressure of the gas even further after the pressure reducing valve to what?

Answer 6

15psi *the optimum pressure for entry into the breathing circuit and ultimately the patients lungs

Question 7

The oxygen flush valve delivers pure oxygen at a flow rate of?

Answer 7

35-75L/min

Question 8

A __________ endotracheal tube has no cuff or side home but is designed with an abrupt decrease in diameter near the patient end of the tube.

Answer 8

Cole

Question 9

1. How do you calculate the time constant to help explain the change in the vaporizer dial setting time reflected in the breathing circuit
2. If you have a total volume of about 5 L in your breathing circuit and you flow rate is set at 2L/min, how many minutes will it take for the anesthetic concentration in the circuit to reach 95% of the new dial setting?

Answer 9

1. Time constant (in minutes)= total volume of the breathing circuit in liters / carrier gas flow rate (in L/min) -when vaporizer setting is changed it take about 5 time constants to effect 95% change
2. 5L divided by 2.5L/min = 2.5 min
3. 5X5=12.5minutes

It will take 12.5 minutes

Question 10

What is the equation to chose the proper resorvoir bag for your patient?

Answer 10

6 X paitent’s tidal volume