Question 1

Advantages of O₂ concentrators for home O₂ therapy include which of the following? 1) Operate at safe low pressures. 2) Are cost-effective for continuous use. 3) Do not waste or lose any O₂. 4) Can power most pneumatic equipment.

Accepted Answer

O₂ concentrators for home O₂ therapy operate at safe low pressures, are cost-effective for continuous use, and do not waste or lose any O₂. However, they may not be able to power most pneumatic equipment. Therefore, options 1, 2, and 3 are correct, but option 4 is not necessarily true.

Question 2

To help prevent problems with home O₂ therapy, you should have the patient or caregiver check all delivery equipment at least how often?

Accepted Answer

To avoid problems before they occur, have the patient or caregiver check all O₂ delivery equipment at least once a day.

Question 3

Advantages of home liquid O₂ systems include which of the following? 1) Usually include a small refillable portable subsystem. 2) Do not require an O₂ service delivery company. 3) Provide large-volume O₂ storage in a small space. 4) Are useful for rehabilitation activities (e.g., walking).

Accepted Answer

Advantages of home liquid O₂ systems include: 1) Usually include a small refillable portable subsystem, which is an advantage for people who need to use O₂ on the go. 2) Do not require an O₂ service delivery company, which can be cost-saving for the users. 3) Provide large-volume O₂ storage in a small space, which is an advantage for people with limited space at home. 4) The option "Are useful for rehabilitation activities (e.g., walking)" does not seem to be an advantage of the home liquid O₂ systems. Therefore, option 4 is incorrect. Thus, the best choice is D, which includes all of the correct advantages of home liquid O₂ systems.

Question 4

In setting up a home care chronic obstructive pulmonary disease patient for continuous low-flow O₂ therapy through an O₂ concentrator, which of the following additional equipment must you provide?

Accepted Answer

You must ensure that all such systems have an emergency backup supply.

Question 5

When not in use, vaporization in a home liquid O₂ system maintains the pressure in the container at what range?

Accepted Answer

When the cylinder is not in use, this vaporization maintains pressures between 20 and 25 psi.

Question 6

Most portable home liquid O₂ systems can provide low-flow O₂ (2 L/min) for approximately how long?

Accepted Answer

Most portable units come with a carrying case or small cart and can provide 5 to 8 hr of O₂ at a flow of 2 L/min.

Question 7

What electrically powered device can separate the O₂ in room air from N₂, thereby providing an enriched flow of O₂ for therapeutic use?

Accepted Answer

An O₂ concentrator is an electrically powered device that physically separates the O₂ in room air from N₂.

Question 8

The O₂ in the inner reservoir of a home liquid O₂ system is maintained at what temperature?

Accepted Answer

The liquid O₂ is kept at approximately -300° F.

Question 9

What is the purpose of the small refillable liquid O₂ tank that comes with many stationary home liquid O₂ reservoirs?

Accepted Answer

Many personal liquid O₂ systems also come with smaller portable units . This system is ideal for the ambulatory patient who is capable of physical activity.

Question 10

When the flow-metering device of a home liquid O₂ system is turned on, O₂ leaves the container through a vaporizing coil, where it is heated by exposure to which of the following?

Accepted Answer

When flow is turned on, gaseous O₂ passes through a vaporizing coil, where it is warmed by exposure to room temperature.

Question 11

Other than providing a backup H cylinder for a home care O₂ therapy patient who uses a concentrator, what other safety measure would you take to ensure an uninterrupted supply?

Accepted Answer

If a home care patient's primary O₂ supply is by concentrator, the home care respiratory therapist should notify the electric power company in writing that life-support equipment is in use at that location.

Question 12

An ambulatory home O₂ therapy patient complains that the portable liquid (at 3 L/min) does not last long enough for a visit with the grandchildren. What might you recommend to overcome this limitation?

Accepted Answer

The functional use time of portable liquid O₂ units can be extended with O₂-conserving devices, including the demand-flow systems.

Question 13

One cubic foot (1 cu/ft) of liquid O₂ equals how many cu/ft of gaseous O₂?

Accepted Answer

One cubic foot of liquid O₂ equals 860 cu/ft of gas.

Question 14

Disadvantages of home liquid O₂ systems include which of the following? 1) Oxygen is lost when not used (because of venting). 2) The low temperature of liquid O₂ can be a hazard. 3) Liquid O₂ must be delivered when needed. 4) These systems cannot drive pneumatic equipment.

Accepted Answer

Home liquid O₂ systems have several disadvantages: oxygen is lost due to venting when not in use, the low temperature of liquid O₂ can pose a hazard, liquid O₂ needs to be delivered regularly, and these systems cannot drive pneumatic equipment.

Question 15

A home care patient receiving long-term O₂ therapy at 5 L/min complains that her nondisposable humidifier is not bubbling properly. Upon inspection of the humidifier, you notice hard white deposits in and around the diffusing element. Which of the following would you recommend to this patient?

Accepted Answer

Otherwise, the porous diffusing element may become occluded. Although complete blockage is unlikely, occlusion of the diffusing element can impair humidification and alter flow.

Question 16

At normal liquid cylinder operating pressures, 1 lb of stored liquid O₂ equals approximately how many liters of gaseous O₂?

Accepted Answer

At normal liquid cylinder operating pressures, 1 lb of liquid O₂ equals approximately 344 L of gaseous O₂.

Question 17

At 3 to 5 L/min output, a typical molecular sieve O₂ concentrator provides O₂ concentrations at what level?

Accepted Answer

At 3 to 5 L/min, O₂ concentrations fall to between 85% and 93%.

Question 18

At flows between 1 and 2 L/min, a typical molecular sieve O₂ concentrator provides an O₂ concentration of approximately what level?

Accepted Answer

At flows of 1 to 2 L/min, the typical molecular sieve concentrator provides between 92% and 95% O₂.

Question 19

What are some disadvantages of O₂ concentrators for home O₂ therapy? 1) FiO₂ values decrease with increased flow. 2) Backup O₂ is required in case of electrical failure. 3) They cannot operate high-pressure devices. 4) Loss of electricity disrupts delivery.

Accepted Answer

Oxygen concentrators for home oxygen therapy have several disadvantages, including decreased FiO2 values with increased flow, the need for backup oxygen in case of electrical failure, inability to operate high-pressure devices, and disruption of delivery during a loss of electricity.

Question 20

The gauge reading of a 50-lb home liquid O₂ system indicates that the cylinder is a third full. What is the approximate duration of flow of this system at 2 L/min?

Accepted Answer

See Mini Clini Computing a Liquid Oxygen System's Duration of Flow for an example of how you can compute a liquid O₂ system's duration of flow.

Quiz 56: Respiratory Care in Alternative Settings

Advantages of O₂ concentrators for home O₂ therapy include which of the following? 1) Operate at safe low pressures. 2) Are cost-effective for continuous use. 3) Do not waste or lose any O₂. 4) Can power most pneumatic equipment.

To help prevent problems with home O₂ therapy, you should have the patient or caregiver check all delivery equipment at least how often?

Advantages of home liquid O₂ systems include which of the following? 1) Usually include a small refillable portable subsystem. 2) Do not require an O₂ service delivery company. 3) Provide large-volume O₂ storage in a small space. 4) Are useful for rehabilitation activities (e.g., walking) .

In setting up a home care chronic obstructive pulmonary disease patient for continuous low-flow O₂ therapy through an O₂ concentrator, which of the following additional equipment must you provide?

When not in use, vaporization in a home liquid O₂ system maintains the pressure in the container at what range?

Most portable home liquid O₂ systems can provide low-flow O₂ (2 L/min) for approximately how long?

What electrically powered device can separate the O₂ in room air from N₂, thereby providing an enriched flow of O₂ for therapeutic use?

The O₂ in the inner reservoir of a home liquid O₂ system is maintained at what temperature?

What is the purpose of the small refillable liquid O₂ tank that comes with many stationary home liquid O₂ reservoirs?

When the flow-metering device of a home liquid O₂ system is turned on, O₂ leaves the container through a vaporizing coil, where it is heated by exposure to which of the following?

Other than providing a backup H cylinder for a home care O₂ therapy patient who uses a concentrator, what other safety measure would you take to ensure an uninterrupted supply?

An ambulatory home O₂ therapy patient complains that the portable liquid (at 3 L/min) does not last long enough for a visit with the grandchildren. What might you recommend to overcome this limitation?

One cubic foot (1 cu/ft) of liquid O₂ equals how many cu/ft of gaseous O₂?

Disadvantages of home liquid O₂ systems include which of the following? 1) Oxygen is lost when not used (because of venting) . 2) The low temperature of liquid O₂ can be a hazard. 3) Liquid O₂ must be delivered when needed. 4) These systems cannot drive pneumatic equipment.

A home care patient receiving long-term O₂ therapy at 5 L/min complains that her nondisposable humidifier is not bubbling properly. Upon inspection of the humidifier, you notice hard white deposits in and around the diffusing element. Which of the following would you recommend to this patient?

At normal liquid cylinder operating pressures, 1 lb of stored liquid O₂ equals approximately how many liters of gaseous O₂?

At 3 to 5 L/min output, a typical molecular sieve O₂ concentrator provides O₂ concentrations at what level?

At flows between 1 and 2 L/min, a typical molecular sieve O₂ concentrator provides an O₂ concentration of approximately what level?

What are some disadvantages of O₂ concentrators for home O₂ therapy? 1) FiO₂ values decrease with increased flow. 2) Backup O₂ is required in case of electrical failure. 3) They cannot operate high-pressure devices. 4) Loss of electricity disrupts delivery.

The gauge reading of a 50-lb home liquid O₂ system indicates that the cylinder is a third full. What is the approximate duration of flow of this system at 2 L/min?

Quiz 56: Respiratory Care in Alternative Settings

Advantages of O2 concentrators for home O2 therapy include which of the following? 1) Operate at safe low pressures. 2) Are cost-effective for continuous use. 3) Do not waste or lose any O2. 4) Can power most pneumatic equipment.

To help prevent problems with home O2 therapy, you should have the patient or caregiver check all delivery equipment at least how often?

Advantages of home liquid O2 systems include which of the following? 1) Usually include a small refillable portable subsystem. 2) Do not require an O2 service delivery company. 3) Provide large-volume O2 storage in a small space. 4) Are useful for rehabilitation activities (e.g., walking) .

In setting up a home care chronic obstructive pulmonary disease patient for continuous low-flow O2 therapy through an O2 concentrator, which of the following additional equipment must you provide?

When not in use, vaporization in a home liquid O2 system maintains the pressure in the container at what range?

Most portable home liquid O2 systems can provide low-flow O2 (2 L/min) for approximately how long?

What electrically powered device can separate the O2 in room air from N2, thereby providing an enriched flow of O2 for therapeutic use?

The O2 in the inner reservoir of a home liquid O2 system is maintained at what temperature?

What is the purpose of the small refillable liquid O2 tank that comes with many stationary home liquid O2 reservoirs?

When the flow-metering device of a home liquid O2 system is turned on, O2 leaves the container through a vaporizing coil, where it is heated by exposure to which of the following?

Other than providing a backup H cylinder for a home care O2 therapy patient who uses a concentrator, what other safety measure would you take to ensure an uninterrupted supply?

An ambulatory home O2 therapy patient complains that the portable liquid (at 3 L/min) does not last long enough for a visit with the grandchildren. What might you recommend to overcome this limitation?

One cubic foot (1 cu/ft) of liquid O2 equals how many cu/ft of gaseous O2?

Disadvantages of home liquid O2 systems include which of the following? 1) Oxygen is lost when not used (because of venting) . 2) The low temperature of liquid O2 can be a hazard. 3) Liquid O2 must be delivered when needed. 4) These systems cannot drive pneumatic equipment.

A home care patient receiving long-term O2 therapy at 5 L/min complains that her nondisposable humidifier is not bubbling properly. Upon inspection of the humidifier, you notice hard white deposits in and around the diffusing element. Which of the following would you recommend to this patient?

At normal liquid cylinder operating pressures, 1 lb of stored liquid O2 equals approximately how many liters of gaseous O2?

At 3 to 5 L/min output, a typical molecular sieve O2 concentrator provides O2 concentrations at what level?

At flows between 1 and 2 L/min, a typical molecular sieve O2 concentrator provides an O2 concentration of approximately what level?

What are some disadvantages of O2 concentrators for home O2 therapy? 1) FiO2 values decrease with increased flow. 2) Backup O2 is required in case of electrical failure. 3) They cannot operate high-pressure devices. 4) Loss of electricity disrupts delivery.

The gauge reading of a 50-lb home liquid O2 system indicates that the cylinder is a third full. What is the approximate duration of flow of this system at 2 L/min?

Advantages of O₂ concentrators for home O₂ therapy include which of the following? 1) Operate at safe low pressures. 2) Are cost-effective for continuous use. 3) Do not waste or lose any O₂. 4) Can power most pneumatic equipment.

To help prevent problems with home O₂ therapy, you should have the patient or caregiver check all delivery equipment at least how often?

Advantages of home liquid O₂ systems include which of the following? 1) Usually include a small refillable portable subsystem. 2) Do not require an O₂ service delivery company. 3) Provide large-volume O₂ storage in a small space. 4) Are useful for rehabilitation activities (e.g., walking) .

In setting up a home care chronic obstructive pulmonary disease patient for continuous low-flow O₂ therapy through an O₂ concentrator, which of the following additional equipment must you provide?

When not in use, vaporization in a home liquid O₂ system maintains the pressure in the container at what range?

Most portable home liquid O₂ systems can provide low-flow O₂ (2 L/min) for approximately how long?

What electrically powered device can separate the O₂ in room air from N₂, thereby providing an enriched flow of O₂ for therapeutic use?

The O₂ in the inner reservoir of a home liquid O₂ system is maintained at what temperature?

What is the purpose of the small refillable liquid O₂ tank that comes with many stationary home liquid O₂ reservoirs?

When the flow-metering device of a home liquid O₂ system is turned on, O₂ leaves the container through a vaporizing coil, where it is heated by exposure to which of the following?

Other than providing a backup H cylinder for a home care O₂ therapy patient who uses a concentrator, what other safety measure would you take to ensure an uninterrupted supply?

An ambulatory home O₂ therapy patient complains that the portable liquid (at 3 L/min) does not last long enough for a visit with the grandchildren. What might you recommend to overcome this limitation?

One cubic foot (1 cu/ft) of liquid O₂ equals how many cu/ft of gaseous O₂?

Disadvantages of home liquid O₂ systems include which of the following? 1) Oxygen is lost when not used (because of venting) . 2) The low temperature of liquid O₂ can be a hazard. 3) Liquid O₂ must be delivered when needed. 4) These systems cannot drive pneumatic equipment.

A home care patient receiving long-term O₂ therapy at 5 L/min complains that her nondisposable humidifier is not bubbling properly. Upon inspection of the humidifier, you notice hard white deposits in and around the diffusing element. Which of the following would you recommend to this patient?

At normal liquid cylinder operating pressures, 1 lb of stored liquid O₂ equals approximately how many liters of gaseous O₂?

At 3 to 5 L/min output, a typical molecular sieve O₂ concentrator provides O₂ concentrations at what level?

At flows between 1 and 2 L/min, a typical molecular sieve O₂ concentrator provides an O₂ concentration of approximately what level?

What are some disadvantages of O₂ concentrators for home O₂ therapy? 1) FiO₂ values decrease with increased flow. 2) Backup O₂ is required in case of electrical failure. 3) They cannot operate high-pressure devices. 4) Loss of electricity disrupts delivery.

The gauge reading of a 50-lb home liquid O₂ system indicates that the cylinder is a third full. What is the approximate duration of flow of this system at 2 L/min?