Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

PFTs and Homcare (Resp 327) > PFT interpretation (General Review) > Flashcards

PFT interpretation (General Review) Flashcards

1
Q

What counts as a good start for a FVC test?

A

BEV <150ml or 5% of FVC (whichever is larger)

  • long enough Expiratory flow ->6 sec of plateau for 2 sec
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What can FVCs and FVLs be used for?

A

Identify level of upper airway obstruction

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

If PEF falls with repeated efforts (or other expiratory flows), what can be suspected?

A
  1. suspect pt fatigue or
  2. hyperreactive airways (as pt tries more times, R may ⬆ and PEF = ⬇)
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

A slow rise in PEF indicates what?

A

A large upper airway obstruction

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

I or E curve squared indicates what?

A

Large upper airway obstruction

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Normal PEF criteria for women, men, and kids?

A
  1. Women: 340-550
  2. Men: 440-740
  3. Kids: 150-450
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

How often should PEF be monitored?

A

2x daily; try to establish a personal best

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

PEF green criteria indicates what treatment plan?

A

Green > 80% best -> Routine Tx

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

PEF yellow criteria indicates what treatment plan??

A

yellow 50-80% best = increase meds

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

PEF Red criteria indicates what treatment plan?

A

Red <50% best = SABA ASAP

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

What does Body plethysmography measure?

A

FRC; determines ERV via spirometry

  • FRC-ERV=RV
  • TLC = FRC + IC
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

What does nitrogen washout measure?

A

Measures FRC; only 1 good test needed

= if >1l should be change in 10% -> report mean

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

What does Helium dilution measure?

A

Measures FRC

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

What does single breath nitrogen washout measure?

A

Distribution of ventilation

  • measures change in N2 during exp of VC breaths after single breath of 100% of O2
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

What does P100 or P0.1 measure?

A

Measure airway hunger

  • Insp against closed shutter. Pas at mouth recorded
  • measures at 100ms after occlusion
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

What does Resting Energy Expenditure (REE) greater than 10% above normal indicate?

A

Hypermetabolic State

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

When to not smoke PFT

A

within 1hr (24hrs for DLCO)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

When not to have alcohol

A

within 4hrs of testing

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

When not to have exercise

A

within 30 mins of testingW

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

When to not have a large meal

A

within 2hrs of tesing

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

Absolute contraindication to spirometry

A

1 month of MI

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

Obstruction in spirometry?

A
  • FEV1% is decreased
  • FVC MAY be decreased
  • FEV1/FVC is decreased
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

Restriction spirometry results

A
  • FEV1 is decreased
  • FVC decreased
  • FEV1/FVC normal
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

obstructive AND restrictive spirometry results

A
  • FEV1 decreased
  • FVC decreased
  • FEV1/FVC decreased
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
25
Q

When to stop SABA before testing?

A

within 4hrs of testing

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
26
Q

When to stop LABA and oral therapy before testing?

A

within 12hrs of testing

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
27
Q

Pre test reversibility

A

3 accepctible FVC manoeuvres

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
28
Q

How long to wait with SABA vs SAAC for PFT testing?

A
  1. > 10mins
  2. 30 mins
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
29
Q

Asthma dx reversibility

A

12-15% improvement in FEV1 OR FVC AND a 200ml increase in either.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
30
Q

negative bronchodilator response

A

<8% change in FVC and FEV1

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
31
Q

Where can PEF be done

A

PF lab, in hospital or bedside,at home via FVL or peak flow meter

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
32
Q

Test procedure in PEF

A
  • rapid and maximum lung volume
  • no hesitation in blow
  • 1-3sec expiratory
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
33
Q

Green zone PEF?

A

80-100% of PB

  • routine tx
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
34
Q

Yellow zone PEF?

A

50-50% of PB

  • acute exacerbation, increase in meds
35
Q

Red zone PEF

A

<50% bronchodilators should be taken immediately, and if no improvement, contact clinician

36
Q

MVV

A

Maximum volume of air a subject can move in and out of the lungs in a specific period of time (12 seconds)
Not as good as FEV1

37
Q

MVV procedure

A

Patient should be sitting and wearing nose clips.

  • Breathe RAPID and as DEEP as possible for 12 seconds
  • ideal rate 90-110br/min
38
Q

Obstruction in MVV?

A

<75-80% of predicted

39
Q

What is Thoracic Gas Volume (TGV)?

A

TGV is all the gas trapped in the thorax at time of airflow obstruction

40
Q

What is FRC plethysmography?

A

Volume of intrathoracic gas when airflow occlusion happens at FRC

41
Q

What is plethysmography used for?

A

Diagnosis of restrictive lung diseases (indicated when Spirometry not showing results or indicating restrictive)

  • Evals obstructive diseases that usually produce lower results (bullous disease of CF)
  • Determination of response to bronchodilators/methacholine (Raw,Sgaw)
  • aka helps follow progression of disease
42
Q

Contraindications of pleth

A
  • Mental confusion
  • IV pumps or O2
  • Condition that interfere with pressure changes (chest tubes, ruptured eardrum, transtracheal O2 catheter)
43
Q

Measurement technique pleth

A

Quiet breathing until stable Vt and FRC established
near FRC, shutter closed and patient pants against closed shutter around 60br/min for 2-3 seconds.
Shutter will open and perform SVC when ready

44
Q

Repeatability of FRC

A

At least 3 FRCpleth values within 5% of eachother

45
Q

P.01

A

100ms of a closed shutter

  • big inspiration against and measures pressure change at mouth recorded.
46
Q

Normal P.01

47
Q

What does P.01 measure

A

Ventilatory drive

  • may be useful in determining weaning from ventilator capability
48
Q

Increased P100

A

Increased with hypercapnia and hypoxia.

  • 0.5-0.6cmH2O/mmhg/PcO2 (20% variability)
  • (0.5cmH2O per 1mmhg increase in PaCO2)
49
Q

How can MIP/MEP be assessed

A

against occluded airway either on intubated patients or mouthpiece

50
Q

What does MIP/MEP measure

A

Assess muscular strength and weaning/extubation potential

51
Q

MIP procedure

A

Exhale to RV, then occlude mouthpiece to inspire maximally for 1-3sec

52
Q

MEP procedure

A

inhale to TLC, mouthpiece occluded and patient is coached to expire maximally for 1-3seconds

53
Q

Normal MIP

A

-80–100cmH2O

54
Q

Normal MEP

A

> 80-100cmH2O

55
Q

critical MIP

A

> -20cmh2o = difficult to wean or extubate or impending respiratory failure.

56
Q

Normal DLCO

A

25ml/min/mmhg

57
Q

Tracer gases DLCO

A

He, Ne and CH4

58
Q

Results of patient with emphysema, Pulmonary fibrosis, ILD..etc

A

DLCO decreased
DLCO/Va decreased

59
Q

Results of patient with small lungs/lung resection/short person DLCO

A

DLCO decreased
DLCO/Va normal

60
Q

Reporting DLCO

A

Mean of results

61
Q

Repeatability DLCO

A

Two tests within 10% or 2ml

62
Q

Acceptability DLCO

A

Inspired volume >90% in less than 4 seconds
No leak or valsalva maneuvres
Expiration <4 seconds with a washout volume

63
Q

He dilution goal

A

To measure FRC

64
Q

What does Va determine

A

Alveolar volume. If DLCO/Va is decreased, it is an indicator for increased thickness of the AC membrane

65
Q

In Bronchoprovocation testing, what do PC20 values indicate?

A

Level of airway hyperresponsiveness

  • PC20 > 16 mg/mL = normal responsiveness
  • PC20 4.0-16 mg/mL = borderline bronchial hyper-responsiveness (BHR)
  • PC20 1.0-4.0 mg/mL = mild BHR and indicates a positive test
  • PC20 < 1.0 mg/mL = moderate to severe BHR
  • PC20 of ≤ 8 mg/mL is common in patients with hyperactive airways
66
Q

Normal FEV1% (FEV1/FVC) range?

A

> 70% of predicted

  • Remember, FVC and FEV normal are >80% of predicted
67
Q

What lung volumes make up Inspiratory capacity (IC)?

A

IRV and VT

68
Q

What lung volumes make up Functional residual capacity (FRC)

A

ERV and RV

69
Q

What lung volumes make up VC?

A

IRV, Vt, and ERV

70
Q

What could a TLC <80% of predicted indicate?

A

Restrictive lung disease

  • If you look at RV and TLC alone; Decreased TLC and with a normal RV/TLC ratio indicate RLD
71
Q

Normal Lung volumes?

A

80-120% of predicted

72
Q

What does a TLC > 120% of predicted indicate?

A

Obstructive lung disorder

  • If you look at the TLC and RV alone; Increased RV/TLC + increased TLC indicate OLD
73
Q

Normal RL/TLC ratio?

A

Anything less than 35% is considered normal.

  • Anything greater than 35% with normal TLC indicates acute air trapping aka asthma
  • Anything greater than 35% with increased TLC indicates chronic hyperinflation
74
Q

COPD vs Acute asthma lung volume comparison

A
  • COPD = Increased TLC and RV as well
  • Acute asthma = normal TLC
75
Q

What tests for lungs volumes

A
  1. Nitrogen washout aka open circuit test (alveolar volume aka gas in and out) –> gives 100% O2 to washout Nitrogen
  2. Helium dilution aka closed circuit test (alveolar volume)
  3. Body plethysmography measures thoracic gas volume (TGN)
76
Q

If you had to choose between nitrogen washout and helium dilution, which would you choose to test lung volumes on a COPD patient with hypercapnia?

A

Helium dilution bc nitrogen washout uses 100% fiO2 which is dangerous for COPD pateints

77
Q

What do diffusing capacities depend on (both corrected and non) that will lower the ratio?

A

Hb (g/dl)

  • If the Hb is low, the predicted diffusing capacity will be lower, but the actual measures, the DLCO/Va ratio will raise up higher than it should
78
Q

Normal DLCO ratio?

A

80-120% of predicted is normal

  • take actual/predicted DlCO…always use the corrected value = DLCO/Va
  • Tells us there is a problem somewhere diffusion defect
79
Q

Normal hemoglobin levels

A
  • For adult males: 13.8 to 17.2 grams per deciliter (g/dL)
  • For adult females: 12.1 to 15.1 g/dL
80
Q

How do you get your percentages for FVC, FEV1, RV, TLC, and DLCO/Va (corrected)

A

Always take the actual/predicted

81
Q

How do you get FEV1%?

82
Q

FVC and FEV normal ranges?

A

<80% of predicted

83
Q

Normal FEV1% or FEV1/FVC?

A

> 70% of predicted is normal

  • Normal/restrictive normal bc they’re able to blow out
  • Anything less than 70% = obstructive bc they can’t blow out their the right amount in the first second (FEV1)

PFTs and Homcare (Resp 327) (19 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2025 Bold Learning Solutions. Terms and Conditions