Spirometry

Give a definition of spirometry and recommendations from NICE guidelines

-Method of assessing lung function
-Shows how quickly and effectively that lungs can be emptied and filled
-COPD NICE guidelines 2018 states that spirometry should be performed in all COPD patients

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Describe how spirometry is used for diagnosis

-Differentiates between obstructive airways disorders and restrictive
diseases

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Define Forced Expiratory Volume (FEV1)

-Volume of air that patient is able to exhale in first second of forced expiration
-Measures FLOW

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Define Forced Vital Capacity (FVC)

-Total volume of air that patient can forcibly exhale after full inspiration
-Measures VOLUME

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Define FEV1/FVC ratio

Percentage of FVC expelled in the first second of forced expiration

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Name factors that restrict lung volume

-Kyphosis
-Scoliosis
-Fibrosis
-Pleural effusion
-Pleural effusion
-Pain

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Which factors influence predicted normal values?

-Gender
-Age
-Height
-Ethnic background

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Describe spirometry interpretations that are normal

-FEV1 > 80% predicted
-FVC > 80% predicted
-FEV1: FVC ratio > 70%

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Describe spirometry interpretations that are abnormal

-FEV1 < 80% predicted
-FVC <80% predicted
-FEV1: FVC ratio < 70%

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How do you work out FEV1 and FVC Percentage?

-Achieved/ Predicted *100

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Explain how to diagnose obstructive disorders from spirometry interpretations

-FEV1 < 80% predicted normal
-FEV1/FVC ratio is reduced < 0.70

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Explain how to diagnose a restrictive disorder from spirometry interpretations

-FEV1 < 80% predicted normal
-FVC < 80% predicted normal
-FEV1/FVC ratio normal > 0.70

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Describe the severity of airflow obstruction in relation to FV1 table

FEV1% predicted:
-Mild _>80%
-Moderate 50-79%
-Severe 30-49%
-Very Severe <30%

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Spirometry

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