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DYNAMIC SPIROMETRY

DYNAMIC SPIROMETRY. Dr. Taj. What is Spirometry ?  It is a measurement of the breathing capacity of the lungs.  It is the most basic and frequently performed test of pulmonary (lung) function. Why “Dynamic” ? It measures the rate at which the lung changes volume during forced

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DYNAMIC SPIROMETRY

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  1. DYNAMICSPIROMETRY Dr. Taj

  2. What is Spirometry ?  It is a measurement of the breathing capacity of the lungs.  It is the most basic and frequently performed test of pulmonary (lung) function.

  3. Why “Dynamic” ? It measures the rateat which the lung changes volume during forced breathing maneuvers.

  4. How is it performed ? Requirements  Vitalograph.  Mouthpiece (disposable).  Nose clip.

  5. Procedure  Make a tight seal around the mouthpiece.  Ask subject to inhale deeply.  Then ask the subject to exhale as strong and as fast as possible.

  6. Two types of curves can be obtained:  Flow-volume curve (Loops).  Forced expiratory volume curve (FEV).

  7. Forced Expiratory Volume Curve

  8. Flow Volume Curve

  9. Normally: Forced expiratory curve Measures:  FEV1=the volume of air exhaled in the 1st second.  FVC=the total volume of exhaled air.  FEV1/FVC ratio= normally ≈ 80%

  10. What is the importance of Spirometry?  Helps in the diagnosis of pulmonary diseases.  Follow disease progression.  Determine strength and function of the chest.

  11. Respiratory Diseases Obstructive Pulmonary Diseases Restrictive Pulmonary Diseases ↓ Lung compliance ↑ airway resistance

  12. Obstructive pulmonary diseases  FEV1 ↓↓↓↓  FVC ↓ or ↔  FEV1/FVC ↓ Eg: Bronchial Asthma COPD (Emphysema)

  13. Restrictive pulmonary disease  FEV1 ↓↓  FVC ↓↓  FEV1/ FVC ↔ or ↑ Eg: Pulmonary fibrosis Pneumoconiosis

  14. EXAMPLE  Dynamic Spirometry was done on 3 patients, the results were the following: A. FEV1= 4L , FVC=5L FEV1/FVC=80% B. FEV1=1.2L , FVC=3L FEV1/FVC=40% C. FEV1= 2.7 L, FVC=3L FEV1/FVC= 90%

  15. Thank you

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