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Pulmonary Flow Volume Loops.. Dr.Padmesh
Pulmonary Flow Volume Loops.. Dr.Padmesh
Pulmonary Flow Volume Loops.. Dr.Padmesh
Pulmonary Flow Volume Loops.. Dr.Padmesh
Pulmonary Flow Volume Loops.. Dr.Padmesh
Pulmonary Flow Volume Loops.. Dr.Padmesh
Pulmonary Flow Volume Loops.. Dr.Padmesh
Pulmonary Flow Volume Loops.. Dr.Padmesh
Pulmonary Flow Volume Loops.. Dr.Padmesh
Pulmonary Flow Volume Loops.. Dr.Padmesh
Pulmonary Flow Volume Loops.. Dr.Padmesh
Pulmonary Flow Volume Loops.. Dr.Padmesh
Pulmonary Flow Volume Loops.. Dr.Padmesh
Pulmonary Flow Volume Loops.. Dr.Padmesh
Pulmonary Flow Volume Loops.. Dr.Padmesh
Pulmonary Flow Volume Loops.. Dr.Padmesh
Pulmonary Flow Volume Loops.. Dr.Padmesh
Pulmonary Flow Volume Loops.. Dr.Padmesh
Pulmonary Flow Volume Loops.. Dr.Padmesh
Pulmonary Flow Volume Loops.. Dr.Padmesh
Pulmonary Flow Volume Loops.. Dr.Padmesh
Pulmonary Flow Volume Loops.. Dr.Padmesh
Pulmonary Flow Volume Loops.. Dr.Padmesh
Pulmonary Flow Volume Loops.. Dr.Padmesh
Pulmonary Flow Volume Loops.. Dr.Padmesh
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Pulmonary Flow Volume Loops.. Dr.Padmesh

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Pulmonary Flow Volume Loops

Pulmonary Flow Volume Loops

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  • 1. Pulmonary Flow Volume Loops Dr.Padmesh http://oscepediatrics.blogspot.in/
  • 2. The abnormality can be due to either Obstructive or Restrictive ventilatory defects. • In Obstructive ventilatory defect, -Level of obstruction ie., intrathoracic (below 6th tracheal ring) or extrathoracic, -Fixed or variable -Reversibility to bronchodilators • In Restrictive defect, -Stage of disease (early or late)
  • 3. • Peripheral Obstructive Flow Volume curves are recorded in diseases such as asthma, chronic bronchitis and emphysema. • Most characteristic feature is the curvilinear shape (up- ward concavity) of descending limb of curve . • This loss of linearity is related to the severity of the obstruction as well as the type of disease.
  • 4. • i) Fixed upper airway obstruction: Both the inspiratory and expiratory limbs are truncated. The shape is quite characteristic with more or less equal restriction of both inspiratory and expiratory flow rates. • ii) Intrathoracic variable obstruction : Obstruction at expiration. Expiratory limb is flattened and inspiratory limb is normal. • iii) Extra thoracic variable obstruction : Obstruction at inspiratory phase. Inspiratory limb is flattened and expiratory limb is normal.
  • 5. • Eg: Tracheal stenosis
  • 6. • Extra thoracic variable obstruction : Obstruction at inspiratory phase. Inspiratory limb is flattened and expiratory limb is normal. • Eg: vocal cord paralysis, extrinsic compression from cervical tumour, goiter, etc.
  • 7. • Intrathoracic variable obstruction : Obstruction at expiration. Expiratory limb is flattened and inspiratory limb is normal.
  • 8. • Restrictive Ventilatory Defect • Any disease which decreases the lung expansion either by chest wall diseases or by space occupying lesion in the pleural cavity or lung causes restrictive type of abnormality. • In early interstitial lung disease (curve a) even before lung volumes are decreased, the FV curves usually show super maximal expiratory airflow associated with a steep descending limb of the curve (due to increase in lung elastic recoil) and the curve becomes tall and narrow or vertically oriented with respect to the volume axis. • In severe reduction of lung volumes (curve b), the FV curve may maintain a relatively normal shape but appears miniatured in all directions.
  • 9. • Examples of restrictive lung disease are pulmonary fibrosis, pneumonias, pleural effusion, obesity, damage to the nerve supply to the respiratory muscle, etc.
  • 10. • Mixed Ventilatory Defects • This is a combination of both obstructive and re-strictive abnormalities. Both curvilinear and miniature shapes are seen in the these situations, e.g. pneumoconiosis
  • 11. •Thank you! http://oscepediatrics.blogspot.in/

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