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SPIROMETRY ( Pulmonary Function Testing)

SPIROMETRY ( Pulmonary Function Testing). By: A.Bolouri MD. SPIROMETRY:. Measuring Lung Volumes & Capacities. Inspiratory Capacity. VC. TV. TLC. ERV. Functional Residual Capacity. RV. Lung Volumes.

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SPIROMETRY ( Pulmonary Function Testing)

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  1. SPIROMETRY(Pulmonary Function Testing) By: A.Bolouri MD.

  2. SPIROMETRY: Measuring Lung Volumes & Capacities

  3. Inspiratory Capacity VC TV TLC ERV Functional Residual Capacity RV Lung Volumes

  4. Vital Capacity: Maximal Volume of Air that a Person can Exhale after a Maximal Inspiration. • Residual Volume: The Volume of Air Remained in Lungs after Maximal Expiration. • Functional Residual Capacity: The Volume of Air Remained in Lungs after Normal Expiration. • Inspiratory Capacity:Maximal Capacity of Inspiration (#75% of VC). • Expiratory Reserve Volume:Maximal Air that a Person can Exhale after a Normal Expiration.

  5. SPIROMETRY: • Reflects Predominantly Resistance to Air flow in the Large or Central Air ways. • Small Airways (<2mm diameter) usually are affected early in the Course of Most diseases which involve the Alveolar wall & Interstitial tissue and may contribute little to the Overall Measurable Resistance.

  6. Spirometry is Effort dependent. • Failure to Obtain Reproducible Results Inadequate Cooperation Ill Health

  7. FVC:Maximal Volume of Air that a Person can Exhale Forcefully after a Maximal Inspiration. • FEV1: the Volume Exhaled during the First second. • FEF25-75%(forced expiration flow between 25% & 75% of the FVC) : The Maximal Mid- Expiratory Flow Rate measures the Average Flow Rate during the Middle Half of the FVC.

  8. Volume – Time Relationship

  9. Volume – Time Relationship

  10. VC + FEV1:Obstructive Lung Disease • VC + TLC :Restrictive Lung Disease • RV + RV/TLC :Pulmonary Over distention & Probable Air Trapping

  11. Maximal Ventilatory Volume(MVV) : • Measuring The Volume of Gas Exchange during 12 to 15 Seconds of MaximalVoluntary Hyperventilation

  12. Severity Mild Moderate Moderately Severe Severe Very Severe FEV1(% of predicted) > 70 >60 and < 70 >50 and < 60 >35 and < 50 <35 Airway Obstruction:

  13. Severity Mild Moderate Moderately Severe Severe Very Severe FVC(% of predicted) > 70 but <LLN >60 and < 70 >50 and < 60 >35 and < 50 <35 Chest Restriction:

  14. Start Here No No No FEV1/FVC <LLN FVC <LLN Normal FEF25%-75% <LLN Yes Yes Yes Probably Normal Restrictive No No FVC <LLN Probably Normal FEV1 <95% Pred Yes Yes Obstructive Mixed Obstructive Restrictive

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