| 词条 | Thrombotic thrombocytopenic purpura |
| 释义 |
| name = Thrombotic thrombocytopenic purpura | synonyms = Moschcowitz syndrome,[1] idiopathic thrombotic thrombocytopenic purpura[2] | image = Echymosis.jpg | width = | alt = | caption = Spontaneous bruising in a woman with critical low platelets | pronounce = | field = Hematology | symptoms = Large bruises, fever, weakness, shortness of breath, confusion, headache[3][2] | complications = | onset = Adulthood[3] | duration = | types = | causes = Unknown, bacterial infections, certain medications, autoimmune diseases, pregnancy[3] | risks = | diagnosis = Based on symptoms and blood tests[2] | differential = Hemolytic-uremic syndrome (HUS), atypical hemolytic uremic syndrome (aHUS)[8] | prevention = | treatment = Plasma exchange, immunosuppressants[1] | medication = | prognosis = < 20% risk of death[1] | frequency = 1 in 100,000 people[3] | deaths = }}Thrombotic thrombocytopenic purpura (TTP) is a blood disorder that results in blood clots forming in small blood vessels throughout the body.[1] This results in a low platelet count, low red blood cells due to their breakdown, and often kidneys, heart, and brain dysfunction.[1] Symptoms may include large bruises, fever, weakness, shortness of breath, confusion, and headache.[2][1] Repeated episodes may occur.[2] In about half of cases a trigger is identified, while in the remainder the cause remains unknown.[2] Known triggers include bacterial infections, certain medications, autoimmune diseases such as lupus, and pregnancy.[2] The underlying mechanism typically involves antibodies inhibiting the enzyme ADAMTS13.[1] This results in decreased break down of large multimers of von Willebrand factor (vWF) into smaller units.[1] Less commonly TTP is inherited from a person's parents, known as Upshaw–Schulman syndrome, such that ADAMTS13 dysfunction is present from birth.[3] Diagnosis is typically based on symptoms and blood tests.[1] It may be supported by measuring activity of or antibodies against ADAMTS13.[1] With plasma exchange the risk of death has decreased from more than 90% to less than 20%.[4] Immunosuppresants, such as glucocorticoids, and rituximab may also be used.[2] Platelet transfusions are generally not recommended.[5] About 1 per 100,000 people are affected.[2] Onset is typically in adulthood and women are more often affected.[2] About 10% of cases begin in childhood.[2] The condition was first described by Eli Moschcowitz in 1924.[2] The underlying mechanism was determined in the 1980s and 1990s.[2] Signs and symptomsThe signs and symptoms of TTP may at first be subtle and nonspecific. Many people experience an influenza-like or diarrheal illness before developing TTP.[6] Neurological symptoms are very common and vary greatly in severity. Frequently reported symptoms include feeling very tired, confusion, and headaches.[6] Seizures and symptoms similar to those of a stroke can also be seen.[6] As TTP progresses, blood clots form within small blood vessels (microvasculature), and platelets (clotting cells) are consumed. As a result, bruising, and rarely bleeding can occur. The bruising often takes the form of purpura, while the most common site of bleeding, if it occurs, is from the nose or gums. Larger bruises (ecchymoses) may also develop.{{citation needed|date=January 2013}} The classic presentation of TTP, which occurs in less than 10% of people, includes five medical signs.[2] These are:
High blood pressure (hypertension) may be found on examination.[7] CausesTTP, as with other microangiopathic hemolytic anemias (MAHAs), is caused by spontaneous aggregation of platelets and activation of coagulation in the small blood vessels. Platelets are consumed in the aggregation process and bind vWF. These platelet-vWF complexes form small blood clots which circulate in the blood vessels and cause shearing of red blood cells, resulting in their rupture and formation of schistocytes.[8] The two best understood causes of TTP are due to autoimmunity and an inherited deficiency of ADAMTS13 (known as the Upshaw-Schülman syndrome).[8] The majority of the remaining cases are secondary to some other factor. AutoimmuneTTP of unknown cause was long known as idiopathic TTP but in 1998 the majority of cases were shown to be caused by the inhibition of the enzyme ADAMTS13 by antibodies. The relationship of reduced ADAMTS13 to the pathogenesis of TTP is known as the Furlan-Tsai hypothesis, after the two independent groups of researchers who published their research in the same issue of the New England Journal of Medicine.[9][10][11] These cases are now classed as an autoimmune disease and are known as autoimmune TTP (not to be confused with immune/idiopathic thrombocytopenic purpura). ADAMTS13 is a metalloproteinase responsible for the breakdown of von Willebrand factor (vWF), a protein that links platelets, blood clots, and the blood vessel wall in the process of blood coagulation. Very large vWF multimers are more prone to lead to coagulation. Hence, without proper cleavage of vWF by ADAMTS13, coagulation occurs at a higher rate, especially in the microvasculature, part of the blood vessel system where vWF is most active due to high shear stress.[3] In idiopathic TTP, severely decreased (<5% of normal) ADAMTS13 activity can be detected in most (80%) people, and inhibitors are often found in this subgroup (44–56%). GeneticThis condition may also be congenital. Such cases may be caused by mutations in the ADAMTS13 gene.[14] This hereditary form of TTP is called the Upshaw–Schulman syndrome.[15][16][17] People with this inherited ADAMTS13 deficiency have a surprisingly mild phenotype, but develop TTP in clinical situations with increased von Willebrand factor levels, e.g. infection. Reportedly, less than 1% of all TTP cases are due to Upshaw–Schulman syndrome.[18] People with this syndrome generally have 5–10% of normal ADAMTS-13 activity.[17][19] SecondarySecondary TTP is diagnosed when the person's history mentions one of the known features associated with TTP. It comprises about 40% of all cases of TTP. Predisposing factors are:[8]
The mechanism of secondary TTP is poorly understood, as ADAMTS13 activity is generally not as depressed as in idiopathic TTP, and inhibitors cannot be detected. Probable etiology may involve, at least in some cases, endothelial damage,[21] although the formation of thrombi resulting in vessel occlusion may not be essential in the pathogenesis of secondary TTP.[22] These factors may also be considered a form of secondary aHUS; people presenting with these features are, therefore, potential candidates for anticomplement therapy. MechanismThe underlying mechanism typically involves autoantibody-mediated inhibition of the enzyme ADAMTS13, a metalloprotease responsible for cleaving large multimers of von Willebrand factor (vWF) into smaller units. The increase in circulating multimers of vWF increases platelet adhesion to areas of endothelial injury, particularly where arterioles and capillaries meet, which in turn results in the formation of small platelet clots called thrombi. As platelets are used up in the formation of thrombi, this then leads to a decrease in the number of overall circulating platelets, which may then cause life-threatening bleeds. Red blood cells passing the microscopic clots are subjected to shear stress, which damages their membranes, leading to rupture of red blood cells within blood vessels, which in turn leads to anaemia and schistocyte formation. The presence of these blood clots in the small blood vessels reduces blood flow to organs resulting in cellular injury and end organ damage. DiagnosisDifferential diagnosisTTP is characterized by thrombotic microangiopathy (TMA), the formation of blood clots in small blood vessels throughout the body, which can lead to microangiopathic hemolytic anemia and thrombocytopenia. This characteristic is shared by two related syndromes, hemolytic-uremic syndrome (HUS) and atypical hemolytic uremic syndrome (aHUS).[23] Consequently, differential diagnosis of these TMA-causing diseases is essential. In addition to TMA, one or more of the following symptoms may be present in each of these diseases: neurological symptoms (e.g. confusion,[24][25] cerebral convulsions[25] seizures,[26]); kidney impairment[27] (e.g. elevated creatinine,[28] decreased estimated glomerular filtration rate [eGFR],[28] abnormal urinalysis[29]); and gastrointestinal (GI) symptoms (e.g. diarrhea[24][30] nausea/vomiting,[26] abdominal pain,[26] gastroenteritis.[24][27] Unlike HUS and aHUS, TTP is known to be caused by an acquired defect in the ADAMTS13 protein, so a lab test showing ≤5% of normal ADAMTS13 levels is indicative of TTP.[31] ADAMTS13 levels above 5%, coupled with a positive test for shiga-toxin/enterohemorrhagic E. coli (EHEC), are more likely indicative of HUS,[32] whereas absence of shiga-toxin/EHEC can confirm a diagnosis of aHUS.[31] TreatmentDue to the high mortality of untreated TTP, a presumptive diagnosis of TTP is made even when only microangiopathic hemolytic anemia and thrombocytopenia are seen, and therapy is started. Transfusion is contraindicated in thrombotic TTP, as it fuels the coagulopathy. Since the early 1990s, plasmapheresis has become the treatment of choice for TTP.[33][34] This is an exchange transfusion involving removal of the person's blood plasma through apheresis and replacement with donor plasma (fresh frozen plasma or cryosupernatant); the procedure must be repeated daily to eliminate the inhibitor and abate the symptoms. If apheresis is not available, fresh frozen plasma can be infused, but the volume that can be given safely is limited due to the danger of fluid overload.[35] Plasma infusion alone is not as beneficial as plasma exchange.[33] Corticosteroids (prednisone or prednisolone) are usually given.[34] Rituximab, a monoclonal antibody aimed at the CD20 molecule on B lymphocytes, may be used on diagnosis; this is thought to kill the B cells and thereby reduce the production of the inhibitor.[34] A stronger recommendation for rituximab exists where TTP does not respond to corticosteroids and plasmapheresis.[34] Caplacizumab is an alternative option in treating TTP as it has been shown that it induces a faster disease resolution compared with those people who were on placebo.[36] However, the use of caplacizumab was associated with increase bleeding tendencies in the studied subjects. People with refractory or relapsing TTP may receive additional immunosuppressive therapy, e.g. vincristine, cyclophosphamide, cyclosporine A, or splenectomy.[2][35] Children with Upshaw-Schülman syndrome receive prophylactic plasma every two to three weeks; this maintains adequate levels of functioning ADAMTS13. Some tolerate longer intervals between plasma infusions. Additional plasma infusions may be necessary for triggering events, such as surgery; alternatively, the platelet count may be monitored closely around these events with plasma being administered if the count drops.[37] Measurements of blood levels of lactate dehydrogenase, platelets, and schistocytes are used to monitor disease progression or remission.{{citation needed|date=August 2013}} ADAMTS13 activity and inhibitor levels may be measured during follow-up, but in those without symptoms the use of rituximab is not recommended.[34] PrognosisThe mortality rate is around 95% for untreated cases, but the prognosis is reasonably favorable (80–90% survival) for people with idiopathic TTP diagnosed and treated early with plasmapheresis.[38] EpidemiologyThe incidence of TTP is about 4-5 cases per million people per year.[39] Idiopathic TTP occurs more often in women and people of African descent, and TTP secondary to autoimmune disorders such as systemic lupus erythematosus occurs more frequently in people of African descent, although other secondary forms do not show this distribution.[40] Pregnant women and women in the post partum period accounted for a notable portion (12–31%) of the cases in some studies; TTP affects about one in 25,000 pregnancies.[41] HistoryTTP was initially described by Dr. Eli Moschcowitz at the Beth Israel Hospital in New York City in 1925. Moschcowitz ascribed the disease (incorrectly, as now known) to a toxic cause. Moschcowitz noted his patient, a 16-year-old girl, had anemia, small and large bruises, microscopic hematuria, and, at autopsy, disseminated microvascular thrombi.[42] In 1966, a review of 16 new cases and 255 previously reported cases led to the formulation of the classical pentad of symptoms and findings (i.e., thrombocytopenia, microangiopathic hemolytic anemia, neurological symptoms, kidney failure, fever); in this series, mortality rates were found to be very high (90%).[43] While a response to blood transfusion had been noted before, a 1978 report and subsequent studies showed blood plasma was highly effective in improving the disease process.[93] In 1991, plasma exchange was reported to provide better response rates compared to plasma infusion.[44] In 1982, the disease had been linked with abnormally large von Willebrand factor multimers. 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Med. |volume=325 |issue=6 |pages=393–7 |date=August 1991 |pmid=2062330 |name-list-format=vanc|author2=Shumak KH |author3=Buskard NA |display-authors=3 |last4=Blanchette |first4=Victor S. |last5=Kelton |first5=John G. |last6=Nair |first6=Rama C. |last7=Spasoff |first7=Robert A.}} 45. ^1 {{cite journal|last=Sadler|first=JE|title=Von Willerbrand factor, ADAMTS13, and thrombotic thrombocytopenic purpura|journal=Blood|year=2008|volume=112|issue=1|pages=11–18|doi=10.1182/blood-2008-02-078170|pmid=18574040|pmc=2435681}} External links{{Medical resources| DiseasesDB = 13052 | ICD10 = {{ICD10|M|31|1|m|30}} (ILDS M31.110) | ICD9 = {{ICD9|446.6}} | OMIM = 274150 | MedlinePlus = 000552 | eMedicineSubj = emerg | eMedicineTopic = 579 | eMedicine_mult = {{eMedicine2|neuro|499}} {{eMedicine2|med|2265}} | MeshID = D011697 }}{{Diseases of the skin and appendages by morphology}}{{Diseases of megakaryocytes}}{{DEFAULTSORT:Thrombotic Thrombocytopenic Purpura}} 6 : Coagulopathies|Autoimmune diseases|Rare diseases|Vascular-related cutaneous conditions|Syndromes affecting blood|RTT |
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