Добавил:
Upload Опубликованный материал нарушает ваши авторские права? Сообщите нам.
Вуз: Предмет: Файл:
EMERGENCY MEDICINE FULL 4kurs.doc
Скачиваний:
4
Добавлен:
15.09.2019
Размер:
1.61 Mб
Скачать

Causes There are a variety of causes of dic, all usually causing the release of chemicals into the blood that instigates the coagulation.

  • Sepsis, particularly with gram-negative bacteria.

  • Obstetric complications (most common cause), with chemicals from the uterus being released into the blood, or from amniotic fluid embolisms, and eclampsia can be causes. Another obstetric condition which can cause DIC is abruptio placentae.

  • Tissue trauma such as burns, accidents, surgery or shock.

  • Liver disease

  • Incompatible blood transfusion reactions or massive blood transfusion (more than the total circulatory volume)

  • Malignant cancers, or widespread tissue damage (e.g. burns), or hypersensitivity reactions all can produce the chemicals leading to a DIC.

  • Viral hemorrhagic fevers bring about their frank effects, paradoxically, by causing DIC.

  • Envenomation by some species of venomous snakes, such as those belonging to the genus Diagnosis

Although numerous blood tests are often performed on patients prone to DIC, the important measures are: full blood count (especially the platelet count), fibrin degradation products or D-dimer tests (markers of fibrinolysis), bleeding time and fibrinogen levels. Decreased platelets, elevated FDPs or D-dimers, prolonged bleeding time and decreased fibrinogen are markers of DIC.

Treatment

The underlying cause must be treated initially. Anticoagulants are only given when indicated (development of thrombotic renal complications) as patients with DIC are prone to bleeding. Platelets may be transfused if counts are very low, and fresh frozen plasma may be administered.

DIC results in lower fibrinogen (as it has all been converted to fibrin), and this can be tested for in the hospital lab. A more specific test is for "fibrin split products" (FSPs) or "fibrin degradation products" (FDPs) which are produced when fibrin undergoes degradation when blood clots are dissolved by fibrinolysis.

In some situations, infusion with antithrombin may be necessary. A new development is drotrecogin alfa (Xigris®), a recombinant activated protein C product. Activated Protein C (APC) deactivates clotting factors V and VIII, and the presumed mechanism of action of drotrecogin is the cessation of the intravascular coagulation. Due to its high cost, it is only used strictly on indication in intensive care patients.[1]

The prognosis for those with DIC, depending on its cause, is often grim, leading the initials to be known colloquially as "death is coming".[2]

TROMBOCYTOPENIA

Signs and symptoms

Often, low platelet levels do not lead to clinical problems; rather, they are picked up on a routine full blood count. Occasionally, there may be bruising, particularly purpura in the forearms, nosebleeds and/or bleeding gums.

It is vital that a full medical history is elicited, to ensure the low platelet count is not due to a secondary process. It is also important to ensure that the other blood cell types red blood cells, and white blood cells, are not also suppressed.

Соседние файлы в предмете [НЕСОРТИРОВАННОЕ]