Pulmonary Function Tests (PFT) Complete Answers
Primary Function of the Lungs
1. Oxygenation of mixed venous blood.
2. Removal of carbon dioxide from mixed venous blood.
Integrity Factors for Lung Function
The primary function of the lungs depends on the integrity of:
1. Airway
2. Pul...
- Peak flow reaches its maximum near total lung capacity.
- As lung volume decreases, resistance increases due to intrathoracic airway narrowing.
- Airflow Dynamics:
- Air flows from higher to lower pressure.
- There is a balance between forces that collapse the airways and those that keep them open.
Key Parameters
- FVC (Forced Vital Capacity): The total amount of air that can be forcibly exhaled after taking a deep
breath.
- FEV1 (Forced Expiratory Volume in one second): The volume of air expelled in the first second of a
forced exhalation.
- FEV1:FVC Ratio: The ratio of FEV1 to FVC; used to assess lung function.
- PEFR (Peak Expiratory Flow Rate): The maximum speed of expiration.
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