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Encephalopathy | |
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Classification and external resources | |
Specialty | Neurology |
ICD-10 | G93.4 |
ICD-9-CM | 348.30 |
MeSH | D001927 |
[edit on Wikidata]
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Encephalopathy /ɛnˌsɛfəˈlɒpəθi/ means disorder or disease of the brain.[1] In modern usage, encephalopathy does not refer to a single disease, but rather to a syndrome of overall brain dysfunction; this syndrome can have many different organic and inorganic causes.
In some contexts, encephalopathy refers to permanent (or degenerative)[2] brain injury, and in others it is reversible. It can be due to direct injury to the brain, or illness remote from the brain. In medical terms it can refer to a wide variety of brain disorders with very different etiologies, prognoses and implications. For example, prion diseases, all of which cause transmissible spongiform encephalopathies, are invariably fatal, but other encephalopathies are reversible and can have a number of causes including nutritional deficiencies and toxins.
The hallmark of encephalopathy is an altered mental state. Depending on the type and severity of encephalopathy, common neurological symptoms are loss of cognitive function, subtle personality changes, inability to concentrate, lethargy, and depressed consciousness. Other neurological signs may include involuntary grasping and sucking motions, myoclonus (involuntary twitching of a muscle or group of muscles), asterixis ("flapping tremor" of the hand when wrist is extended),[citation needed] nystagmus (rapid, involuntary eye movement), tremor, seizures, jactitation (restless picking at things characteristic of severe infection),[citation needed] and respiratory abnormalities such as Cheyne-Stokes respiration (cyclic waxing and waning of tidal volume), apneustic respirations and post-hypercapnic apnea.
There are many types of encephalopathy. Some examples include:
Blood tests, cerebrospinal fluid examination by lumbar puncture (also known as spinal tap), brain imaging studies, electroencephalograms and similar diagnostic studies may be used to differentiate the various causes of encephalopathy.
Diagnosis is frequently clinical. That is, no set of tests give the diagnosis, but the entire presentation of the illness with nonspecific test results informs the experienced clinician of the diagnosis.
Treatment varies according to the type and severity of the encephalopathy. Anticonvulsants may be prescribed to reduce or halt any seizures. Changes to diet and nutritional supplements may help some patients. In severe cases, dialysis or organ replacement surgery may be needed.
Treating the underlying cause of the disorder may improve or reverse symptoms. However, in some cases, the encephalopathy may cause permanent structural changes and irreversible damage to the brain. These permanent deficits can be considered a form of stable dementia. Some encephalopathies can be fatal.
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リンク元 | 「100Cases 71」「100Cases 34」「意識障害」「ライ症候群」「脳症」 |
拡張検索 | 「portosystemic encephalopathy」「chronic encephalopathy」 |
症候学プリント | DIF.95 | ||
A | alcohol | アルコール関連 | accidents, arterial occlusions, arteriosclerosis, aneurysms, autoimmune disorders |
I | insulin | インスリン関連(低血糖、糖尿病性ケトアシドーシス、非ケトン性高浸透圧性昏睡) | inflammatory, intoxication (encephalitis, cerebral abcess, meningitis, alcoholism, opiates, barbiturates) |
U | uremia | 尿毒症、電解質異常、内分泌異常、肝性脳症 | undefined disorders (narcolepsy, conversion hysteria) |
E | encephalopathy, endocrinopathy, electrolyte | 脳症(脳炎、脳血管障害)、てんかん後 | endocrine disorders(myxedema coma, hyperparathyroidism, diabetic coma, insulin shock), epileptic coma |
O | opiate, other overdose of O2 & CO2 | 薬物中毒 | organ failure(hepatic coma, respiratory failure, uremia) |
T | trauma, tumor, temparature | 頭部外傷、脳挫傷、硬膜外血腫、硬膜下血腫 | |
I | infection | 感染症、髄膜炎 | |
P | psychogenic | 精神疾患 | |
S | syncope, seizure, stroke, shock, senile | 失神、クモ膜下出血 |
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