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Natural Health Nexis
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This nhn COPD Guide includes information about Chronic Obstructive Pulmonary Disease that is written primarily to help COPD Patients better understand their condition and the range of COPD treatment options that are currently available:
Chronic Obstructive Pulmonary Disease (COPD) is usually assessed by considering the specific COPD Symptoms exhibited, and a quantifiable parameter known as Lung Function.
Lung FunctionLung Function is most often determined by using a Spirometer to define the Forced Expiratory Volume in 1 Second (FEV1). The resulting FEV1 measurement is usually normalised by FVC (the Forced Vital Capacity) and expressed on a percentage scale as FEV1%, where 100% denotes normal lung function. |
Following the Global Initiative for Chronic Obstructive Lung Disease (GOLD) classification, the progression of COPD may be assessed across 4 Stages:
COPD Stage 1 is considered mild COPD or early stage COPD.
Lung Function FEV1% is measured in the range 80 - 100% for Stage 1 COPD.
The Major Symptom of Stage 1 COPD is a chronic cough that produces mucus from the lungs.
COPD Stage 2 is considered as moderately progressed COPD.
Lung Function FEV1% is measured in the range 50 - 79% for Stage 2 COPD.
Major Symptoms for Stage 2 COPD include:
COPD Stage 3 is considered as severely progressed COPD.
Lung Function FEV1% is measured in the range 30 - 49% for Stage 3 COPD.
Major Symptoms for Stage 3 COPD include:
COPD Stage 4 is considered as very severely progressed COPD.
In Stage 4 COPD, Lung Function FEV1% is measured below 30%, or below 50% with chronic respiratory failure due to retention of carbon dioxide.
Major Symptoms for Stage 4 COPD include:
Additional Stage 4 COPD Symptoms often include:
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COPD Life Expectancy

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