waveform

Question 1

what creates flow

Answer 1

pressure gradient between patient and vent

Question 2

what creates volume (in pressure mode)

Answer 2

flow (positive or negative between pt and vent)

Question 3

how to increase volume without increasing pressure

Answer 3

shorten Ti

Question 4

difference between PC and PS in conscious pt

Answer 4

Ti

Question 5

indications of secretions

Answer 5

• increased pip

- jumpping waveform

Question 6

what causes flow to deviate in positive direction from expect direction

Answer 6

flow is moving from vent to patient

Question 7

what causes flow to deviate in a negative direction from the expected direction

Answer 7

flow is moving from patient to vent (expiratory effort)

Question 8

what can a drop in etco2 have form indicate

Answer 8

pt taking a spontaneous breath

Question 9

which wave form in pressure mode will indicate a leak

Answer 9

volume

Question 10

cause of scalloping in pressure waveform

Answer 10

sough
over distension in vc
inadequate flow delivery ( pt drawing more)
Ti too long

Question 11

inadequate flow delivery on pressure waveform

Answer 11

wave form is round and wide (fix is to increase pressure not Ti)

Question 12

what does ramp time control

Answer 12

speed of inspiratory valve opening

Question 13

what is a fix from air hunger

Answer 13

neo (50ms)
ped (150ms)
shorten ramp time

Question 14

indication of Ti too short

Answer 14

flow will drop before Ti ends

Question 15

restrictive lung disease is

Answer 15

• poor compliance

- ie decreased lung volume

Question 16

obstructive lung disease is

Answer 16

• poor resistance

- ie decreased airflow on expiration

Question 17

indication of de-recruitmentment on flow waveform

Answer 17

narrowing of flow waveform

Question 18

indication or increased resistance on flow waveform

Answer 18

spike then negative scoop in flow waveform on inspiration and takes longer for plateaus to return to zero
- fix is to shorten Ti

Question 19

possible resolution to a patient who is uncomfortable on ac

Answer 19

SIMV on the same setting as the support synchronies with respirations (ensures pt still reaches desired volume