Lung Vent Agents

Question 1

method of localization of lung vent agenst

Answer 1

closed compartment of airways and lungs traps inhaled RP so RP used must mix completely with air and stay uniform

Question 2

2 classes of lung vent

Answer 2

gaseous and aeresol

Question 3

gaseous material have advantage of

Answer 3

complete and lasting mixing with air

Question 4

gaseous materials have disadvantage of

Answer 4

difficulty trapping exhaled gases from pt

Question 5

noble gases are useful why

Answer 5

lack of physiological uptake in body and once inhaled become inert and exhale immediatley

Question 6

the small amount of gaseous material absorbed in bloodstream is exerted how

Answer 6

first pass through body via blood excreting into airspace

Question 7

how is Xe133 produced

Answer 7

reactor

Question 8

xe133 half life

Answer 8

5.3 days

Question 9

energy of Xe133

Answer 9

low energy gamma (80 kev)

Question 10

Dose xe133

Answer 10

unit dose of 10-20mCi cal wednesday of week of use

Question 11

what does the unit dose consist of

Answer 11

2cc glass filled vial of Xenon diluted slightly with CO2 under slight negative pressure

Question 12

Xe127 is produced hoq

Answer 12

accelerator prodcued

Question 13

xe127 half life

Answer 13

36.4 days

Question 14

xe 127 energy

Answer 14

gamma emission of 172 and 203 kev

Question 15

xe127 is no longer availabel

Answer 15

yes

Question 16

how is xenon gas collected once patient exhales

Answer 16

closed system that outputs to environement or storage for decay

Question 17

how are aeresols made

Answer 17

droplets with Tc labeled materials made by bubbling oxygen through radioactive liquid

Question 18

what is a baffle system

Answer 18

allows droplets of proper size to be carried by oxygen flow to the patient

Question 19

what happens to the aersol that does not deposit on interior lung surface

Answer 19

it is exhaled and trapped in a filter to prevent contamination of pt or room

Question 20

optimal droplet size

Answer 20

0.5-3 microns (sm enough for prolonged suspension in the air)

Question 21

biological half life in lung for aeresol is

Answer 21

45 min

Question 22

pt inhale material for how long

Answer 22

2-8 minc

Question 23

main concern with aersol pt

Answer 23

contamination of pt, cam, tech externally

Question 24

what is kit made of

Answer 24

Tc DTPA

Question 25

dose of Tc DTPA

Answer 25

30-40 mCi