出典(authority):フリー百科事典『ウィキペディア(Wikipedia)』「2012/12/18 13:16:16」(JST)
Uremia | |
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Classification and external resources | |
Urea |
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ICD-10 | N19, R39.2 |
ICD-9 | 585-586, 788.9 |
DiseasesDB | 26060 |
eMedicine | med/2341 |
MeSH | D014511 |
Uremia or uraemia (see spelling differences) is a term used to loosely describe the illness accompanying kidney failure (also called renal failure), in particular the nitrogenous waste products associated with the failure of this organ.[1] This is not to be confused with uricemia, or hyperuricemia, a build up of uric acid in the blood.
In kidney failure, urea and other waste products, which are normally excreted into the urine, are retained in the blood. Early symptoms include anorexia and lethargy, and late symptoms can include decreased mental acuity and coma. Other symptoms include fatigue, nausea, vomiting, cold, bone pain, itch, shortness of breath, and seizures. It is usually diagnosed in kidney dialysis patients when the glomerular filtration rate, a measure of kidney function, is below 50% of normal.[2]
Azotemia is another word that refers to high levels of urea, but is used primarily when the abnormality can be measured chemically but is not yet so severe as to produce symptoms. Uremia can also result in uremic pericarditis. There are many dysfunctions caused by uremia affecting many systems of the body, such as blood (lower levels of erythropoietin), sex (lower levels of testosterone/estrogen), and bones (osteoporosis and metastatic calcifications). Uremia can also cause decreased peripheral conversion of T4 to T3, producing a functionally hypothyroid state.
Decreased taste and smell[3]
Encephalopathy
Because uremia mostly is a consequence of kidney failure, its signs and symptoms often occur concomitantly with other signs and symptoms of kidney failure, such as hypertension due to volume overload, hypocalcemic tetany, and anemia due to erythropoietin deficiency.[3] These, however, are not signs or symptoms of uremia.[3] Still, it is not certain that the symptoms currently associated with uremia actually are caused by excess urea, as one study showed that uremic symptoms were relieved by initiation of dialysis, even when urea was added to the dialysate to maintain the blood urea nitrogen level at approximately 90 mg per deciliter (that is, approximately 32 mmol per liter).[3]
Condition | Prothrombin time | Partial thromboplastin time | Bleeding time | Platelet count |
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Vitamin K deficiency or warfarin | Prolonged | Normal or mildly prolonged | Unaffected | Unaffected |
Disseminated intravascular coagulation | Prolonged | Prolonged | Prolonged | Decreased |
Von Willebrand disease | Unaffected | Prolonged | Prolonged | Decreased and/or Rejected |
Hemophilia | Unaffected | Prolonged | Unaffected | Unaffected |
Aspirin | Unaffected | Unaffected | Prolonged | Unaffected |
Thrombocytopenia | Unaffected | Unaffected | Prolonged | Decreased |
Liver failure, early | Prolonged | Unaffected | Unaffected | Unaffected |
Liver failure, end-stage | Prolonged | Prolonged | Prolonged | Decreased |
Uremia | Unaffected | Unaffected | Prolonged | Unaffected |
Congenital afibrinogenemia | Prolonged | Prolonged | Prolonged | Unaffected |
Factor V deficiency | Prolonged | Prolonged | Unaffected | Unaffected |
Factor X deficiency as seen in amyloid purpura | Prolonged | Prolonged | Unaffected | Unaffected |
Glanzmann's thrombasthenia | Unaffected | Unaffected | Prolonged | Unaffected |
Bernard-Soulier syndrome | Unaffected | Unaffected | Prolonged | Decreased or unaffected |
Factor XII deficiency | Unaffected | Prolonged | Unaffected | Unaffected |
Besides renal failure, the level of urea in the blood can also be increased by:
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リンク元 | 「意識障害」「尿毒症」「uremic」「uraemic」「尿毒」 |
拡張検索 | 「uremia-related disorder of central nervous system」 |
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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