What is a wedge infarction?
This red infarct is wedge-shaped and based on the pleura. These infarcts are hemorrhagic because, though the pulmonary artery carrying most of the blood and oxygen is cut off, the bronchial arteries from the systemic circulation (supplying about 1% of the blood to the lungs) is not cut off.
What is hemorrhagic infarction?
A hemorrhagic infarct (HI) can be defined as an ischemic infarct in which an area of bleeding exists within necrosing cerebral tissue. This definition includes small hemorrhages confined to minor ischemic areas in grey matter as well as much larger lesions involving cortical and deep hemispheric regions.
Does a lung infarction heal?
The blood shows an increase in number of white blood cells and sedimentation rate (clumping of red blood cells). Infarcts that do not heal within two or three days generally take two to three weeks to heal. The dead tissue is replaced by scar tissue.
How does hemorrhagic infarction occur?
Hemorrhagic infarcts are infarcts commonly caused by occlusion of veins, with red blood cells entering the area of the infarct, or an artery occlusion of an organ with collaterals or dual circulation.
What causes hemorrhagic pulmonary infarction?
Hemorrhage in pulmonary infarcts is attributed to the dual arterial blood supply of the lung. Clots in the deep leg veins are the most common source of pulmonary emboli. Factors which predispose to such clotting include immobilization, venous congestion with low flow, vascular injury, and hypercoagulable states.
What causes hemorrhagic infarct?
How painful is pulmonary infarction?
If pulmonary infarction occurs, the person may cough with blood-stained sputum, sharp chest pain when breathing in, and in some cases fever. Symptoms of infarction often last several days but usually become milder every day.
How is lung infarction treated?
However, in the large majority of cases, pulmonary infarction is caused by a pulmonary embolus. The treatment of pulmonary embolus includes, in addition to supportive care, the institution of anticoagulant medication, usually with intravenous heparin, followed in a few days by an oral anticoagulant.
Which organ infarct is invariably hemorrhagic?
Red infarctions (hemorrhagic infarcts) generally affect the lungs or other loose organs (testis, ovary, small intestines).
What causes Hampton’s hump?
Hampton hump refers to a dome-shaped, pleural-based opacification in the lung most commonly due to pulmonary embolism and lung infarction (it can also result from other causes of pulmonary infarction (e.g. vascular occlusion due to angioinvasive aspergillosis).
What are peripheral wedge-shaped pulmonary consolidations in pulmonary infarct?
Peripheral wedge-shaped pulmonary consolidations are a classic manifestation of pulmonary infarct, particularly in the setting of a PE.
Which imaging modalities are used in the workup of hemorrhagic infarct?
Additional imaging modalities such as computed tomography angiogram, perfusion, and magnetic resonance imaging may provide additional information in differentiating hemorrhagic infarct from primary hemorrhages. 1. Introduction
What is the diagnosis of hemorrhage on CT scan?
In acute stroke, the differential diagnosis of hemorrhage detected on computed tomography (CT) scan ranges from hemorrhagic infarct (HI), primary intracerebral hemorrhage (ICH) to hemorrhage from venous infarction.
What is Hihi in a stroke?
HI, or hemorrhagic transformation of an infarct, occurs in approximately one-third of cases of ischaemic stroke [3]. When an infarct is immediately followed by the occurrence of petechial hemorrhage in the same arterial territory, the diagnosis of HI is easily made.
