Alraiyes, PFT 6/11/2007 Page 1

Pulmonary Function Test

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Abdul Hamid Alraiyes

MD. 6/15/2007

Alraiyes, PFT 6/11/2007 Page 2

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???