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Acute on chronic: An acute exacerbation of a chronic condition. It is applied to a variety of conditions, including liver failure, [4] [5] subdural hematoma, [6] renal failure [7] respiratory failure, [8] [9] and bronchitis. Acute on chronic inflammation: A term sometimes used in pathology to describe a pattern of inflammation which is a ...
Infective endocarditis is divided into the three categories of acute, subacute, and chronic based on the duration of symptoms. [11] Acute infective endocarditis refers to the presence of signs and symptoms of infective endocarditis that are present for days up to six weeks. [11]
Acute pericarditis is more common than chronic pericarditis, and can occur as a complication of infections, immunologic conditions, or even as a result of a heart attack (myocardial infarction), as Dressler's syndrome. Chronic pericarditis however is less common, a form of which is constrictive pericarditis. The following is the clinical ...
The mechanism for chronic rejection is yet to be fully understood, but it is known that prior acute rejection episodes are the main clinical predictor for the development of chronic rejection. [6] In particular, the incidence increases following severe or persistent acute rejection, whereas acute rejection episodes with return to function back ...
Chronic inflammation In acute inflammation, if the injurious agent persists then chronic inflammation will ensue. This process, marked by inflammation lasting many days, months or even years, may lead to the formation of a chronic wound. Chronic inflammation is characterised by the dominating presence of macrophages in the injured tissue.
On histologic examination, these areas of necrotic bone are the basis for distinguishing between acute osteomyelitis and chronic osteomyelitis. Osteomyelitis is an infective process that encompasses all of the bone (osseous) components, including the bone marrow. When it is chronic, it can lead to bone sclerosis and deformity. [citation needed]
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Chronic wounds mostly affect people over the age of 60. [14] The incidence is 0.78% of the population and the prevalence ranges from 0.18 to 0.32%. [18] As the population ages, the number of chronic wounds is expected to rise. [30] Ulcers that heal within 12 weeks are usually classified as acute, and longer-lasting ones as chronic.