Normal Hemostasis
Thrombocytopenia can be ________ or ________
- Aquired
Acquired thrombocytopenia types (theres 3 of them)
Immune thrombocytopenia purpura (ITP)
Thrombotic thrombocytopenia purpura (TTP)
Heparin-induced thrombocytopenia (HIT)
Immune Thrombocytopenic Purpura (ITP)
What do you know about it??
Thrombotic Thrombocytopenic Purpura (TTP)
What do you know about it??
What is Thrombocytopenia
lack of platelets. not enough of them or getting destroyed in blood stream or in spleen and liver.
what is the lifespan of a platelet
5-6 days
Normal platelet range
150,000-450,000
Heparin-induced Thrombocytopenia (HIT)
platelet destruction and vascular endothelial injury are the two major responses to an immune-mediated response to heparin.
Two major responses to an immune-mediated response to heparin
Platelet destruction
Vascular endothelial injury
Additional complications of Heparin induced Thrombocytopenia (HIT)
may include arterial vascular infarcts resulting in skin necrosis, stroke, and end-organ damage (e.g., kidneys).
Why are symptoms of bleeding rare with HIT
the platelet count rarely drops below 60,000/μL.
Clinical manifestations of Thrombocytopenia
Petechiae
small, flat, pinpoint, red or reddish-brown microhemorrhages. When the platelet count is low, RBCs may leak out of the blood vessels and into the skin to cause petechiae.
Purpura
When petechiae are numerous, the resulting reddish skin bruise is called purpura.
ecchymoses
Larger purplish lesions caused by hemorrhage. Ecchymoses may be flat or raised; pain and tenderness sometimes are present
With thrombocytopenia- internal bleeding may manifest as
weakness, fainting, dizziness, tachycardia, abdominal pain, or hypotension.
Diagnostic Studies for Thrombocytopenia
↓ Platelet count (platelet count less than 150,000) ---Prolonged bleeding < 50,000/μL ---Hemorrhage ↓ 20,000/μL Peripheral blood smear Medical history Clinical examination Lab parameter comparisons
When are platelet transfusions recommended
not recommended until the count is below 10,000/μL (10 × 109/L) unless the patient is actively bleeding
Thrombocytopenia and collaborative care
Based on etiology of the disorder.
Removal or treatment of the underlying cause or disorder.
Avoid aspirin and other medications that affect platelet function or production.
Immune Thrombocytopenic Purpura (ITP) Collaborative Care
Corticosteroids --FIRST LINE DEFENSE High dose of IVIG and anti Rh (D) Rituximab Splenectomy- Romiplostim (Nplate ) Aminocaproic acid (Amicar) Platelet Transfusion
(ITP) when is IVIG and anti-Rho used.
in the patient who is unresponsive to corticosteroids or splenectomy or for whom splenectomy is not an option. They compete with antiplatelet antibodies for macrophage receptors in the spleen
(ITP) Rituximab
reduces the immune recognition of platelets.
(ITP) Romiplostim (Nplate)
used for patients with chronic ITP who have not had success with other treatments. It increases platelet production.