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Pulmonary Function Analysis – Methods and Results

Pulmonary function analysis is a diagnostic procedure used to measure breathing capacity and lung performance. It is essential for detecting and monitoring respiratory conditions such as asthma or COPD.

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Pulmonary function analysis is a diagnostic procedure used to measure breathing capacity and lung performance. It is essential for detecting and monitoring respiratory conditions such as asthma or COPD.

What is Pulmonary Function Analysis?

Pulmonary function analysis (also called a pulmonary function test or lung function test) is a medical examination that measures and evaluates how well the lungs are working. It provides key information about how effectively the lungs can inhale, hold, and exhale air. The procedure is painless, non-invasive, and is typically performed in a clinic or hospital setting.

When is Pulmonary Function Analysis Performed?

Pulmonary function analysis is used in a variety of clinical situations:

Suspected bronchial asthma or chronic obstructive pulmonary disease (COPD)
Monitoring of known lung conditions and evaluating treatment response
Investigation of breathlessness, persistent cough, or exercise intolerance
Preventive screening in smokers or individuals with occupational exposure to harmful substances
Pre-operative assessment of respiratory reserve before surgery
Follow-up in conditions such as cystic fibrosis or pulmonary fibrosis

Methods of Pulmonary Function Analysis

Spirometry

Spirometry is the most commonly used method. The patient breathes into the mouthpiece of a spirometer and performs specific breathing maneuvers. Key measurements include:

FEV1 (Forced Expiratory Volume in one second): the amount of air that can be forcibly exhaled in the first second
FVC (Forced Vital Capacity): the total volume of air that can be forcibly exhaled after a maximum inhalation
FEV1/FVC ratio (Tiffeneau index): the ratio of these two values, which is critical for distinguishing obstructive from restrictive ventilation disorders

Body Plethysmography

Body plethysmography (whole-body plethysmography) is an advanced technique in which the patient sits inside an airtight chamber. It allows measurement of additional parameters such as residual volume (air remaining after maximum exhalation) and airway resistance. This method provides a complete picture of lung volumes.

Diffusion Capacity Measurement (DLCO)

The diffusion capacity test (DLCO – Diffusing Capacity of the Lung for Carbon Monoxide) assesses how well gases pass through the alveoli (air sacs) into the bloodstream. It is particularly important for diagnosing pulmonary emphysema, pulmonary fibrosis, or pulmonary hypertension.

Bronchial Provocation Tests

A bronchial provocation test assesses the sensitivity of the airways by exposing the patient to irritating substances (e.g., methacholine) or physical exertion. This can detect bronchial hyperresponsiveness, which is characteristic of bronchial asthma.

Preparation and Procedure

Before the test, certain medications (e.g., bronchodilators) may need to be paused depending on the clinical question. Patients should avoid smoking for several hours before the test and refrain from eating a heavy meal beforehand. During the examination, the patient wears a nose clip and breathes through a mouthpiece. Patient cooperation is essential for obtaining reliable results.

Interpretation of Results

Measured values are compared against reference values calculated based on age, sex, height, and ethnicity. Deviations may indicate different types of ventilation disorders:

Obstructive ventilation disorder: narrowing of the airways, typical of asthma and COPD (reduced FEV1/FVC ratio)
Restrictive ventilation disorder: reduction in lung volume, for example in pulmonary fibrosis or pleural effusion (reduced FVC with a normal ratio)
Mixed ventilation disorder: a combination of both types

Risks and Side Effects

Pulmonary function analysis is a very safe procedure. The forced breathing maneuvers may occasionally cause brief dizziness or coughing. In cases of severe heart failure, recent myocardial infarction, or very severe breathlessness, the test may be contraindicated and should only be performed after careful medical evaluation.

References

Miller MR et al. - Standardisation of spirometry. European Respiratory Journal, 2005; 26(2): 319-338.
Global Initiative for Chronic Obstructive Lung Disease (GOLD) - Global Strategy for the Diagnosis, Management, and Prevention of COPD. 2024. Available at: https://goldcopd.org
Pellegrino R et al. - Interpretative strategies for lung function tests. European Respiratory Journal, 2005; 26(5): 948-968.

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