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Pulmonary Function Test Interpretation
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Flashcards
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Reduced FEV1/FVC ratio
Indicates an obstructive lung disease. Conditions associated: Asthma, Chronic Obstructive Pulmonary Disease (COPD), Chronic bronchitis, Emphysema.
Increased FEV1/FVC ratio
May suggest a restrictive pattern or normal lung function. Conditions associated: Interstitial lung disease, Obesity-related respiratory issues, Pleural diseases like fibrothorax and pneumothorax.
Reduced Expiratory Reserve Volume (ERV)
Indicates a reduced capacity to exhale forcefully. Conditions associated: Obesity, Pregnancy, Age-related changes.
Decreased FVC
Can suggest either obstructive or restrictive lung disease. Conditions associated: Interstitial lung disease, Neuromuscular disorders, Chest wall deformities.
Increased Residual Volume (RV)
Can indicate air trapping or hyperinflation. Conditions associated: COPD, Asthma during exacerbation, Cystic fibrosis.
Increased DLCO
May indicate polycythemia or left-to-right cardiac shunt. Conditions associated: Polycythemia vera, Intracardiac shunt, Asthma.
Normal spirometry with reduced exercise tolerance
Indicates other factors affecting exercise capacity. Conditions associated: Cardiac conditions, Poor conditioning, Anemia.
Increased Total Lung Capacity (TLC)
Suggests hyperinflation or increased lung compliance. Conditions associated: Emphysema, Asthma (chronic), Age-related lung changes.
Reduced Diffusion Capacity (DLCO)
Indicates abnormal gas exchange. Conditions associated: Emphysema, Pulmonary hypertension, Anemia.
Reduced Forced Inspiratory Flow (FIF)
Impaired inhalation suggests upper airway or tracheal obstruction. Conditions associated: Vocal cord paralysis, Tracheal stenosis, Obstructive sleep apnea.
Normal FEV1/FVC with reduced volumes
Indicates a restrictive pattern without obstruction. Conditions associated: Interstitial lung diseases, Extrathoracic restriction like obesity, Neuromuscular weakness.
Reduced MVV (Maximum Voluntary Ventilation)
Suggests decreased respiratory muscle function or endurance. Conditions associated: Neuromuscular disorders, Muscular dystrophies, Severe airflow obstruction.
Reduced Total Lung Capacity (TLC)
Indicates restrictive lung disease. Conditions associated: Pulmonary fibrosis, Sarcoidosis, Scoliosis.
Reduced Mid-Expiratory Flow (FEF25-75%)
Suggests small airways disease. Conditions associated: Bronchiolitis, Early COPD, Cystic fibrosis.
High RV/TLC ratio
Suggests air trapping. Conditions associated: Chronic obstructive pulmonary diseases, Severe persistent asthma, Alpha-1 antitrypsin deficiency.
Decreased FEV1
Indicates airflow limitation. Conditions associated: Asthma, COPD, Bronchiectasis.
Reduced FEV1 with normal FVC
Implies airway obstruction without lung volume reduction. Conditions associated: Early COPD, Asthma, Chronic bronchitis.
Reduced Inspiratory Capacity (IC)
May indicate restrictive lung disease or hyperinflation. Conditions associated: Obesity, Pleural effusion, Neuromuscular diseases.
Reduced Peak Expiratory Flow (PEF)
Implies limitation in airway patency. Conditions associated: Asthma, COPD, Vocal cord dysfunction.
Normal TLC with reduced DLCO
Indicates impaired gas transfer with normal lung volumes. Conditions associated: Pulmonary vascular diseases, Early interstitial lung disease, Emphysema.
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