Lung Function

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Lung Function Tests : 

Lung Function Tests Dr AKM Mosharraf Hossain Assoc Prof Of Respiartory Diseases Department of Medicine BSMMU

Types of PFT : 

Types of PFT Peak flow meter 2. Spirometry 3. Measurement of lung volumes-Plethismography 4. Gas transfer factor 5. Exercise test- walk test, ergometer test 6. ABG

Slide 3: 

Peak flow meter 2. Spirometry 3. Measurement of lung volumes-Plethismography 4. Gas transfer factor 5. Exercise test- walk test, ergometer test 6. ABG

Slide 4: 

Peak Flow Meter Cheapest and easy 2. In absence of spirometer, establish, assess and monitor Bronchial asthma 3. Home management of asthma

Spirometry : 

Spirometry Spirometry is a measure of airflow and lung volumes during forced expiratory manoeuvre from full inspiration. 3 basic things are measured- ? FVC ? FEV1 ? FEV1/FVC

Spirometry procedure : 

Spirometry procedure ? stand or sit straight ? inhale maximally (breathe in all the way) ? get a good seal around the mouth piece ? blow out as hard (not blowing hard enough-apparent obstructive) and as fast as possible ? continue to exhale until he or she can blow no more, at least 6 secs ( stops blowing too early apparent restrictive)

ATS criteria : 

ATS criteria Acceptibility criteria: ? free from artifacts (cough or glottic closure) ? free from leaks ? Good starts, time to PEF <120 millisecs ? acceptable exhalation-at least 6 secs

ATS criteria : 

ATS criteria Reproducibility criteria: ? 3 acceptable manoeuvres ? 2 largest FVC with in .2 l ? 2 largest FEV1 with in .2l

Slide 21: 

Normal

Slide 22: 

uninterpretable

Slide 24: 

Small midrange flow

Slide 25: 

Fixed upper airway obs

Slide 26: 

Variable extrathoracic

Slide 28: 

Mild to mod airway obs

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Severe obstruction

Slide 30: 

Severe obstruction

Slide 31: 

Restrictive ventilatory defect

Slide 33: 

Methacholine challenge test To establish CVA 2. To exclude eosinophilic bronchitis 3. 20% reduction of FEV1 with <8mg/ml methacholine is considered positive

Lung function Tests : 

Lung function Tests Peak flow meter 2. Spirometry 3. Measurement of lung volumes-Plethismography 4. Gas transfer factor 5. Exercise test- walk test, ergometer test 6. ABG

Slide 36: 

Lung volume measurement ? Essential to establish restrictive lung diseases ? Most important measurements are – TLC, RV, FRC ? In restriction, cardinal feature is low TLC ? In mixed pattern like sarcoidosis, spirometry shows obstruction and lung volumes are reduced

Slide 41: 

Peak flow meter 2. Spirometry 3. Measurement of lung volumes-Plethismography 4. Gas transfer factor 5. Exercise test- walk test, ergometer test 6. ABG

Slide 42: 

Disorders with low DLCO Diseases of pulmonary circulation 2. Diseases of alveoli 3. Cardiac diseases 4. Misc- anaemia,pregnancy,smoking

Slide 43: 

Peak flow meter 2. Spirometry 3. Measurement of lung volumes-Plethismography 4. Gas transfer factor 5. Exercise test- walk test, ergometer test 6. ABG

Slide 44: 

Indications Assess cardiorespiratory functions 2. Sensitive indicator of early alveolar or interstitial diseases 3. Pneumocystis pneumonia