Pft interpretation
- 1. JAMIA MILLIA ISLAMIA CENTRE OF PHYSIOTHERAPYAND REHABILITATION SCIENCES TOPIC – PFT INTERPRETATION PHYSIOTHERAPY IN CARDIOPULMONARY CONDITIONS (402) SUBMITTED TO: DR. JAMALALI MOIZ SUBMITTED BY: AZIZA NAZNEEN BPT IV YEAR
- 2. Pulmonary function test • Pulmonary function testing is a group of tests that provide objective data on a patient's lung function • Evaluates 1 or more major aspects of the respiratory system – Lung volumes – Airway function – Gas exchange 2
- 3. Indications • Detect disease • Evaluate extent and monitor course of disease • Evaluate treatment • Assess pre operative risk. • Assess prognosis. • Assess health status before beginning strenous activity or procedure 3
- 4. Contraindications • Hemoptysis of unknown origin. • Unstable angina pectoris. • Recent MI. • Thoracic aneurysm. • Cerebral aneurysm. • Abdominal aneurysm. • Recent eye surgery. • Recent abdominal and thoracic surgery. • Patient with a history of syncope. 4
- 5. Technique • Have patient seated comfortably • Closed-circuit technique – Place nose clip on – Have patient breathe on mouthpiece – Have patient take a deep breath as fast as possible – Blow out as hard as they can until you tell them to stop 5
- 6. Terminology • Forced vital capacity (FVC): – Total volume of air that can be exhaled forcefully from TLC – The majority of FVC can be exhaled in <3 seconds in normal people, but often is much more prolonged in obstructive diseases – Measured in liters (L) • Interpretation of % predicted: – 80-120% Normal – 70-79% Mild reduction – 50%-69% Moderate reduction – <50% Severe reduction 6
- 7. • Forced expiratory volume in 1 second: (FEV1) – Volume of air forcefully expired from full inflation (TLC) in the first second – Measured in liters (L) – Normal people can exhale more than 75-80% of their FVC in the first second; thus the FEV1/FVC can be utilized to characterize lung disease • Interpretation of % predicted: – >75% Normal – 60%-75% Mild obstruction – 50-59% Moderate obstruction – <49% Severe obstruction 7
- 8. FEV1 FVC 8
- 9. Categories of diseases • Obstructive • Restrictive • Mixed 9
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- 12. Acceptability Criteria • Good start of test • No coughing • No variable flow • No early termination • Reproducibility 12
- 13. References 1. Miller MR, Crapo R, Hankinson J, et al. General considerations for lung function testing. Eur Respir J 2005 2. Wanger J, Clausen JL, Coates A, et al. Standardisation of the measurement of lung volumes. Eur Respir J 2005; 3. American Thoracic Society. Lung Function Testing: Selection of Reference Values and Interpretative Strategies. Am Rev Respir Dis 1991 13