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Asthma > Procedures to measure ventilation > Flashcards

Procedures to measure ventilation Flashcards

1
Q

What is peak expiratory flow used for?

A

Diagnosis between obstructive and restrictive diseases and monitoring and assessment of the severity of asthma

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2
Q

What does the peak expiratory flow measure?

A

The maximal rate of flow on expiration

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3
Q

What is FEV1?

A

forced expiratory volume in 1 second

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4
Q

What is FVC?

A

total volume expired from maximal inspiration to maximal expiration

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5
Q

What FEV1/FVC ratio diagnoses an obstructive defect?

A

<0.7

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6
Q

What FEV1/FVC ratio diagnosis is a restrictive diagnosis?

A

> 0.8

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7
Q

How do you calculate the predicted FEV1?

A

% your value/predicted value = predicted FEV1 or FVC

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8
Q

Is the FEV1 reduced more significantly in obstructive diseases or restrictive?

A

obstructive

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9
Q

Is the FVC reduced more significantly in obstructive diseases or restrictive?

A

restrictive

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10
Q

what happens to the RV and TLC in obstructive diseases?

A

increases

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11
Q

what happens to the RV and TLC in restrictive diseases?

A

decreases

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12
Q

What are the causes of obstructive defects?

A

Asthma, COPD, bronchiectasis, airway obstruction

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13
Q

What are the causes of restrictive defects?

A

idiopathic pulmonary fibrosis, skeletal deformity, neuromuscular weakness, obesity

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14
Q

What does bronchodilator responsiveness assess?

A

whether lung function improves with SABA therapy, done before and 15 mins after SABA inhalation, if it improves it suggests a diagnosis of asthma

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15
Q

What can measure the functional residual capacity?

A

helium dilution

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16
Q

what is the DLCO?

A

a test for gas exchange capacity by testing the diffusing capacity of CO

17
Q

What would you see on a flow volume loop in a restrictive disease?

A

the whole loop is smaller

18
Q

What is the FEV1/FVC ratio in mild COPD patients?

A

> 80% predicted

19
Q

What is the FEV1/FVC ratio in patients with moderate COPD?

A

FEV1 is between 50-80% predicted

20
Q

What is the FEV1/FVC ratio in patients with severe COPD

A

FEV1 is between 30-50% predicted

Asthma (6 decks)

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