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Human Physiological Measurement > Lung Function Tests > Flashcards

Lung Function Tests Flashcards

1
Q

FEV1

A

Forced expiratory volume in 1 second

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2
Q

FVC

A

Forced Vital Capacity

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3
Q

TLC

A

Total lung capacity

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4
Q

FRC

A

Functional residual capacity

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5
Q

AWR

A

Airway resistance

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6
Q

C

A

Lung compliance

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7
Q

TLco

A

Single breath carbon monoxide transfer factor

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8
Q

PaCO2

A

Partial pressure of oxygen in systemic arterial blood

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9
Q

SpO2

A

Oxygen saturation in arterial blood by pulse oximetry

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10
Q

PetCO2

A

End tidal partial pressure of CO2

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11
Q

What is the equation for minute volume?

A

Tidal volume x respiratory frequency

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12
Q

Equation for measuring FRC by He dilution

A

He(initial) v Vol(spir) x FHe(initial)

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13
Q

What does F stand for in He dilution equation

A

Fractional concentration of helium

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14
Q

How is human lung compliance measured

A

Nano-oesophageal tube - oesophageal balloon

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15
Q

Compliance =

A

Delta V / Delta P

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16
Q

Airway resistance measured by

A

Constant volume whole body plethysmography

17
Q

AWR equation, shutter open

A

AWR= (deltaPalveolar/F)
deltaPalv = deltaPbox x (Volbox/Valv)

18
Q

Shutter closed equation

A

Valv =Palm x (delta V / delta P alv )

19
Q

Equation for airway resistance slope

A

Slope = GAW = 1/raw

20
Q

Carbon Monoxide Transfer Factor

A

TLco = mmol CO transferred . Min-1. KPa-1

21
Q

Residual volume

A

RV = vol in x (%He in / % He out) - vol

22
Q

Normal Pa02

23
Q

Normal PaCO2

24
Q

Normal HCO3

25
Q

Normal pH

26
Q

low pa02, normal or low PaCO2 and HCO3, normal or high pH

A

Ventilation:perfusion mismatch

27
Q

Low pao2, high Pac02, normal hco3, low pH

A

Acute hypo ventilation, acute respiratory acidosis

28
Q

Low pa02, high, high, low

A

Chronic hypoventilation, chronic respiratory alkalosis

29
Q

Normal pa02, low paco2, normal hco3, high pH

A

Acute hyperventilation, acute respiratory alkalosis

30
Q

Normal pa02, low PaCO2, low hco3, high pH

A

Chronic hyperventilation, chronic respiratory alkalosis

31
Q

Test for reversibility of airway obstruction

A

Beta 2 agonist (salbutamol) inhalation
15% incr in FEV1 in 15 mins
Usually increases in FVC
FEV1/FVC ration useful
Diagnosis = asthma

32
Q

Test for bronchial hyper-responsiveness

A

Methacholine or histamine
PC20 ie dose which causes a 20% fall in FEV1
Normal = >16mg/mL

33
Q

Test for allergy

A

Any suspect allergen
Increased diurnal variation in PEF occupational asthma

34
Q

Predicted VE

A

= 70% of (40xFEV1)

35
Q

Predicted peak HR

Human Physiological Measurement (7 decks)

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