Difference between exudate and transudate
Write a brief on chronic venous congestion of the lung.
Answer:
CVC of the lung occurs in left heart failure resulting in an increase in pulmonary venous pressure.
lung Gross Features
- Lungs become heavy and firm in consistency.
- The Cut surface is dark and rusty brown in color which is referred to as the brown induration of the lungs.
Difference between exudate and transudate
Lung Microscopically
- The alveolar septa are widened and thickened. Widen due to the presence of interstitial edema, dilated and congested capillaries. Thickened due to an increase in fibrous connective tissue.
- Rupture of the dilated and congested capillary may result in minute intra-alveolar hemorrhage
- Breakdown of RBCs liberates hemosiderin pigment which is taken up by alveolar macrophages so-called heart failure cells, present in the alveolar lamina.
- Brown induration is due to pigmentation and fibrosis.
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