![LUNG FUNCTION TEST
PEAK EXPIRATORY FLOW RATE [PEFR]
PEAK EXPIRATORY Flow RATE [PEFR]
DEFINATION-
The maximum rate at which the air
Can be Expired after a deep Inspiration
is know as Peak Expiratory flow rate.
[PEFR]](https://image.slidesharecdn.com/lungfunctiontest-230409055915-651f91f3/85/LUNG-FUNCTION-TEST-pptx-26-320.jpg)
![LUNG FUNCTION TEST
PEAK EXPIRATORY FLOW RATE [PEFR]
• Normal Value - In Normal persons it is
400 liters /minute
• Measurement - Peak expiratory flow rate
is determined by using the instrument
wright's peak flow meter or a mini Peak
flow meter.](https://image.slidesharecdn.com/lungfunctiontest-230409055915-651f91f3/85/LUNG-FUNCTION-TEST-pptx-27-320.jpg)
![LUNG FUNCTION TEST
PEAK EXPIRATORY FLOW RATE [PEFR]
• SIGNIFICANCE OF DETERMINING PEFR
• Determination of Peaks explanatory flow
rate is useful for assessing the respiratory
diseases especially to differentiate the
obstructive & restrictive disease.](https://image.slidesharecdn.com/lungfunctiontest-230409055915-651f91f3/85/LUNG-FUNCTION-TEST-pptx-28-320.jpg)
![LUNG FUNCTION TEST
PEAK EXPIRATORY FLOW RATE [PEFR]
• generally PEFR is reduced any type of
respiratory disease However, the reduction
is more significant in the obstructive
disease than in the restrictive disease.](https://image.slidesharecdn.com/lungfunctiontest-230409055915-651f91f3/85/LUNG-FUNCTION-TEST-pptx-29-320.jpg)
![LUNG FUNCTION TEST
PEAK EXPIRATORY FLOW RATE [PEFR]
• Thus in restrictive diseases the PEFR is
200 liters / minute.
• And in obstructive disease it is only 100
liters / minute.](https://image.slidesharecdn.com/lungfunctiontest-230409055915-651f91f3/85/LUNG-FUNCTION-TEST-pptx-30-320.jpg)
LUNG FUNCTION TEST.pptx
- 1. LUNG FUNCTION TEST DR. KISHOR RAMCHANDRA UGALE.
- 3. LUNG FUNCTION TEST Pulmonary function tests are valuable investigations in the management of patients with suspected or previously diagnosed respiratory disease.
- 4. LUNG FUNCTION TEST Pulmonary function tests (PFTS) are an important tool in the investigation and monitoring of patients with respiratory pathology. They provide important information relating to the large and small airways.
- 5. LUNG FUNCTION TEST They aid diagnosis, help monitor response to treatment and can guide decisions regarding further treatment and intervention.
- 6. LUNG FUNCTION TEST • Pulmonary function tests (PFTs) are that show how well the lungs are working. The tests measure lung volume, capacity, rates of flow, and gas exchange. • This information can help diagnose and decide the treatment of certain lung disorders.
- 7. LUNG FUNCTION TEST There are 2 types of disorders that cause problems with air moving in and out of the lungs: • Obstructive - This is when air has trouble flowing out of the lungs due to airway resistance. This causes a decreased flow of air.
- 8. LUNG FUNCTION TEST • Restrictive - This is when the lung tissue and/or chest muscles can’t expand enough. This creates problems with air flow, mostly due to lower lung volumes.
- 9. LUNG FUNCTION TEST - Spirometer • spiro means breath and meter means a measuring instrument that meaning Spirometer • air in lungs may be subdivide at different Point into four different values & four different capacities recorded these are recorded with the help of the instrument know as Spirometer.
- 10. LUNG FUNCTION TEST - Spirometry • The procedure by which the pulmonary ventilation, various lung volume and lung capacities are measured is called Spirometry. • now a day computerized spirometer is available in which the graphical record can be obtained.
- 11. LUNG FUNCTION TEST – Spirometry LUNG VOLUMES - It is the non – overlapping subdivisions of total lungs air.
- 12. LUNG FUNCTION TEST – Spirometry LUNG VOLUMES Tidal volume- TV - 1 ) The volume of air inhaled or exhaled during quiet breathing. 2) It is amount of air breathed in and out of lungs in normal quiet respiration. In normal adult male it is 500 mL
- 14. LUNG FUNCTION TEST – Spirometry LUNG VOLUMES Respiratory minute volume (RMV) - by definition RMV can be Obtained by multiplying tidal volume by respiratory rate per minute and approximately equal to 500 mL x 12 = 6 liters/minute
- 15. LUNG FUNCTION TEST – Spirometry LUNG VOLUMES Inspiratory Reserve volume (IRV) – 1) it is additional maximum amount of air that can be after the end of normal inspiration beyond tidal volume -3300 ml. 2) Maximal air that can be inhaled after a quiet inspiration It amount 2-0 to 3.3 liters, 2000 to 3300ml in young male adult.
- 16. LUNG FUNCTION TEST – Spirometry LUNG VOLUMES Expiratory Reserve volume (ERV) – 1) Maximal air that can be breathed out after quiet Expiration It amount 1 liters it is 1100 ml. 2) it is additional maximum amount of air that can be exhaled after normal expiration it 1000ml
- 17. LUNG FUNCTION TEST – Spirometry LUNG VOLUMES Residual Volume (RV) – It is the amount of air remained in the lungs even after forced Expiration. it is 1200 ml
- 18. LUNG FUNCTION TEST – Spirometry Lung Capacities
- 19. LUNG FUNCTION TEST – Spirometry Lung Capacities Lung Capacities – These are combination of two or more lung volumes.
- 20. LUNG FUNCTION TEST – Spirometry Lung Capacities Inspiratory Capacity (IC) – maximal volume of air Inhaled after full expiration. TV +IRV = about 3.5 liters, 3500 ml
- 21. LUNG FUNCTION TEST – Spirometry Lung Capacities Functional Residual capacity (FRC) - volume of air remaining in the lungs after a quiet expiration. RV + ERV = about 2-2 liters to 2.3 liters means 2200 ml to 2300 ml
- 22. LUNG FUNCTION TEST – Spirometry Lung Capacities Total lungs Capacity (TLC) - Total volume of air present in the lungs after maximum Inspiration is known as total lungs capacity. IC + FRC = about 5.7 to 5.3 liters 5700 ml to 6000ml
- 23. LUNG FUNCTION TEST - Spirometry Vital capacity (V.C) - maximal volume of air exhaled after forced full inspiration . I C + ERV = about 4.5 to 5.6 liters, 4500 ml to 4600 ml.
- 24. LUNG FUNCTION TEST – Spirometry Lung Capacities
- 26. LUNG FUNCTION TEST PEAK EXPIRATORY FLOW RATE [PEFR] PEAK EXPIRATORY Flow RATE [PEFR] DEFINATION- The maximum rate at which the air Can be Expired after a deep Inspiration is know as Peak Expiratory flow rate. [PEFR]
- 27. LUNG FUNCTION TEST PEAK EXPIRATORY FLOW RATE [PEFR] • Normal Value - In Normal persons it is 400 liters /minute • Measurement - Peak expiratory flow rate is determined by using the instrument wright's peak flow meter or a mini Peak flow meter.
- 28. LUNG FUNCTION TEST PEAK EXPIRATORY FLOW RATE [PEFR] • SIGNIFICANCE OF DETERMINING PEFR • Determination of Peaks explanatory flow rate is useful for assessing the respiratory diseases especially to differentiate the obstructive & restrictive disease.
- 29. LUNG FUNCTION TEST PEAK EXPIRATORY FLOW RATE [PEFR] • generally PEFR is reduced any type of respiratory disease However, the reduction is more significant in the obstructive disease than in the restrictive disease.
- 30. LUNG FUNCTION TEST PEAK EXPIRATORY FLOW RATE [PEFR] • Thus in restrictive diseases the PEFR is 200 liters / minute. • And in obstructive disease it is only 100 liters / minute.