spirometry
TRANSCRIPT
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Alraiyes, PFT 6/11/2007 Page 1
Pulmonary Function Test
`
Abdul Hamid Alraiyes
MD. 6/15/2007
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Spirometry: Dynamic Lung Volumes
The factors that affect the Pulmonary Function Test :
Age
Height
Used to measure the rate at which the lung changes volume during
forced breathing maneuver. (Flow – Volume Curve)
Factors that affect FVC
1. Lung
2. Pleural effusion
3. Chest wall
4. muscles
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Spirometry: Dynamic Lung Volumes
Q: what is the only disease that cause increase in FVC?
Hint1: this disease written in CMDT page 1134
A: …………………….
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Spirometry: Obstructive findings
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Q: what is the only disease that cause increase in FVC?
Hint2: can increase the incidence of OSA at the same time.
A: …………………….
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Spirometry: Restrictive findings
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Spirometry: Dynamic Lung Volumes
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Variable & Fixed Obstruction
FEF 50% / FIF 50%
Q: what is the only disease that cause increase in FVC?
Hint3: You ask the patient to bring his photo album.
A: …………………….
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Static (Absolute) Lung Volumes
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Nitrogen Washout test
Bronchodilator & Bronchial Challenge Testing
TEST
Substance Used
Bronchodilator Bronchial Challenge
Metered dose inhaler Methacholine
Positive Results An increase of 12% or 200ml or more in FEV1 or FVC.
A reduction of 20% or more in FEV1.
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Diffusing Capacity of the Lungs
DLCO
INCREASED DECREASED
Supine position Emphysema Exercise Lung Resection
Asthma (Sx free) Bronchial Obstruction Obesity Multiple Pulmonary Emboli
Polycythemia Anemia Intra-alveolar hemorrhage Lung Fibrosis
Lt- to – Rt intracardiac Shunts Pregnancy???