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*Decreased outflow of venous blood
 
*Decreased outflow of venous blood
 
*Most commonly caused by left-sided or bilateral cardiac failure  
 
*Most commonly caused by left-sided or bilateral cardiac failure  
**Stagnant blood in pulmonary vessels -> red blood cells move into alveoli and are phagocytosed -> [[General Pathology - Pigmentation and Calcification#Haemosiderin|haemosiderin in macrophages]] (heart failure cells)  
+
**Stagnant blood in pulmonary vessels -> red blood cells move into alveoli and are phagocytosed -> [[Pigmentation and Calcification - Pathology#Haemosiderin|haemosiderin in macrophages]] (heart failure cells)  
 
*One-sided in post-mortem hypostatic congestion
 
*One-sided in post-mortem hypostatic congestion
 
*Acute pulmonary congestion is seen after barbiturate euthanasia
 
*Acute pulmonary congestion is seen after barbiturate euthanasia
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**Undetected in many horses
 
**Undetected in many horses
 
**Haemorrhage is dorsocaudal, large brown areas
 
**Haemorrhage is dorsocaudal, large brown areas
**Micro - alveolar haemorrhage, macrophages containing [[General Pathology - Pigmentation and Calcification#Haemosiderin|haemosiderin]], mild interstitial fibrosis
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**Micro - alveolar haemorrhage, macrophages containing [[Pigmentation and Calcification - Pathology#Haemosiderin|haemosiderin]], mild interstitial fibrosis
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***From bacterial [[Endocardial - Pathology#Inflammatory-Endocarditis|endocarditis]], jugular thrombophlebitis, [[Liver Inflammatory - Pathology#Hepatic abscessation|hepatic abscesses]] etc.
 
***From bacterial [[Endocardial - Pathology#Inflammatory-Endocarditis|endocarditis]], jugular thrombophlebitis, [[Liver Inflammatory - Pathology#Hepatic abscessation|hepatic abscesses]] etc.
 
***May cause unexpected death if in large numbers
 
***May cause unexpected death if in large numbers
***May develop [[Lungs Inflammatory - Pathology|suppurative pneumonia]] -> [[Lungs Inflammatory - Pathology#Pulmonary abscesses|pulmonary abscesses]], [[Arterial Disease - Pathology#Inflammatory-Arteritis|arteritis]], [[General Pathology - Thrombosis|thrombosis]]
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***May develop [[Lungs Inflammatory - Pathology|suppurative pneumonia]] -> [[Lungs Inflammatory - Pathology#Pulmonary abscesses|pulmonary abscesses]], [[Arterial Disease - Pathology#Inflammatory-Arteritis|arteritis]], [[Thrombosis - Pathology|thrombosis]]
 
*Pulmonary infarcts usually occur when there is embolisation or thrombosis during general circulatory collapse or passive congestion of heart failure
 
*Pulmonary infarcts usually occur when there is embolisation or thrombosis during general circulatory collapse or passive congestion of heart failure
 
*Pulmonary thromboembolism is a sequel to in cattle to large emboli from liver abscesses close to the vena cava
 
*Pulmonary thromboembolism is a sequel to in cattle to large emboli from liver abscesses close to the vena cava

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