PULMONARY APOPLEXY. HEMORRHAGIC INFARC- 

 TION. 



Diflferent forms. Embolism with infarction. Embolism from arteritis. 

 Rupture of blood-vessel. Changes in color. Symptoms. Repair. 



Haemorrhage into the lungs may be : ist. Petechial in infec- 

 tious diseases. 2d. interlobular as from ruptured vessels. 3d. 

 hifarction or apoplexy. Infarction results from embolism of a 

 branch of the pulmonary artery, which may in its turn be due to 

 clots formed in a diseased heart or in the systemic veins and car- 

 ried to the lungs in the blood stream. It may also result from 

 inflammation of the inner coat of the pulmonary artery. A vir- 

 tual stasis occurs beyond the embolism, and the blood filtering, in 

 through the anastomosing capillaries fills and blackens the affected 

 lobule. With rupture of a considerable vessel the blood escapes 

 en masse and appears like black currant jelly. As it ages it be- 

 comes granular and changes to a yellow color, or it may form a 

 necrotic mass enclosed in a cyst as in lung plague. The symp- 

 toms, apart from the absence of respiratory murmur and resonance, 

 are not diagnostic. It may take months to undergo liquefaction 

 and absorption. Iodide of potassium, bitters and stimulating 

 diuretics may be given. 



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