In medicine, describing a disease as acute denotes that it is of short duration and, as a corollary of that, of recent onset. The quantitation of how much time constitutes "short" and "recent" varies by disease and by context, but the core denotation of "acute" is always qualitatively in contrast with "chronic", which denotes long-lasting disease (for example, in acute leukaemia and chronic leukaemia). In addition, "acute" also often connotes two other meanings: sudden onset and severity, such as in acute myocardial infarction (AMI), where suddenness and severity are both established aspects of the meaning. It thus often connotes that the condition is fulminant (as in the AMI example), but not always (as in acute rhinitis, which is usually synonymous with the common cold). The one thing that acute MI and acute rhinitis have in common is that they are not chronic. They can happen again (as in recurrent pneumonia, that is, multiple acute pneumonia episodes), but they are not the same case ongoing for months or years (unlike chronic obstructive pulmonary disease, which is).
A noncount sense of "acute disease" refers to the acute phase, that is, a short course, of any disease entity. For example, in an article on ulcerative enteritis in poultry, the author says, "in acute disease there may be increased mortality without any obvious signs", referring to the acute form or phase of ulcerative enteritis.
Not all acute diseases or injuries are severe, and vice versa. For example, a mild stubbed toe is an acute injury. Similarly, many acute upper respiratory infections and acute gastroenteritis cases in adults are mild and usually resolve within a few days or weeks.
The term "acute" is also included in the definition of several diseases, such as severe acute respiratory syndrome, acute leukaemia, acute myocardial infarction, and acute hepatitis. This is often to distinguish diseases from their chronic forms, such as chronic leukaemia, or to highlight the sudden onset of the disease, such as acute myocardial infarct.
Related terms include:
|Template:Vanchor||Very acute or violent. Denotes fulminant, whereas "acute" only sometimes connotes fulminant.|
Peracute ("very") is not to be confused with preacute ("before", the opposite of postacute).
|Template:Vanchor||"Happening again"—the concept is often one of multiple acute episodes. Relapse can mean the same as recurrent, although relapse is usually used to describe recurrence of chronic conditions that go into remission and then recur.|
|Template:Vanchor||An acute exacerbation of a chronic condition. It is applied to a variety of conditions, including liver failure, subdural hematoma, renal failure respiratory failure, and bronchitis.|
|Template:Vanchor||A term sometimes used in pathology to describe a pattern of inflammation which is a mixture of chronic and acute inflammation.Template:Medical citation needed It may be seen in asthma, rheumatoid arthritis, chronic peptic ulcer, chronic periodontitis, tuberculosis, tonsillitis and other conditions.|
|Template:Vanchor||A vaguely defined state that is clearly not acute, but rather between acute and chronic, for example subacute endocarditis, or subacute sclerosing panencephalitis.|
|chronic||A long-term condition.|
Acute care is the early and specialist management of adult patients suffering from a wide range of medical conditions requiring urgent or emergency care usually within 48 hours of admission or referral from other specialties.
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