PFTS.ppt
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Pulmonary function tests evaluate lung function and include spirometry, tests of lung volumes like helium dilution and plethysmography, diffusing capacity tests, arterial blood gas analysis, and exercise tests like the 6-minute walk test. Other measures include forced expiratory flows, peak expiratory flow rate, minute ventilation, maximum breathing capacity, breathing reserve, and tests to evaluate dyspnea. Arterial blood gases are measured through indwelling catheters or arterial puncture with samples placed on ice and analyzed using miniature glass electrodes.
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PFTS.ppt
- 3. • Spirometry- static and dynamic • helium dilution and plethysmography – FRC • Diffusing capacity – single breath test. • ABG- PO2, PCO2, PH, • Exercise tests- 6 min walk test - used to assess progress of cardiovascular and pulmonary functions.
- 15. • Other dynamic lung volumes and capacities • -FEF 25-75% (Maximal mid expiratory flow rate- 300L/min) • -Peak expiratory flow rate- 400-450L/min • -Minute or Pulmonary Ventilation = TV* RR- 6L/min • -Maximum Breathing Capacity-90-170L/min
- 16. • Breathing reserve = MVV-MV - Dyspnoeic index = (MVV-MV)*100/MVV, Normal> 60-70% - Dyspnoea <60%
- 20. . Arterial blood gas composition • Technique: indwelling catheter/ percutaneous arterial puncture • samples are drawn anaerobically and placed on ice • Minature glass electrodes