Platelet disorders

Platelet Disorders (Disorders of the platelets)

Disease Description (Causes and Symptoms)

• Summary of definition: A collective term for conditions in which abnormalities in the number or function of platelets make normal hemostasis difficult, or conversely, excessive platelets cause a tendency toward thrombosis. The normal platelet range in adults is approximately 150,000–400,000/µL.
• Major pathophysiology:
  • Abnormal platelet production (bone marrow problems, bone marrow stimulation or suppression).
  • Increased platelet destruction or consumption (immune-mediated destruction, DIC, etc.).
  • Platelet dysfunction (congenital or acquired due to drugs or metabolic conditions).
  • Excess platelets (reactive increase or essential/idiopathic thrombocytosis).
• Common causes:
  • Medications: antiplatelet drugs such as aspirin and NSAIDs, some anticancer drugs, etc.
  • Chronic diseases: renal failure, liver failure, multiple myeloma, etc.
  • Blood disorders such as immune thrombocytopenia (ITP) and hemolytic anemia.
  • Myeloproliferative disorders (essential thrombocythemia, genetic abnormalities such as JAK2).
• Major symptoms:
  • Bleeding tendency: petechiae, ecchymosis (bruising), bleeding gums or nosebleeds, heavy menstruation, excessive bleeding during surgery or after trauma.
  • With platelet dysfunction or excess: thrombosis, embolism (deep vein thrombosis, pulmonary embolism, etc.).
  • It is also common for the condition to be asymptomatic and discovered during a health checkup or preoperative testing.

Treatment Methods

• General principles: After identifying the cause, treating the cause (stopping the medication, treating the underlying disease) takes priority.
• Diagnostic tests: CBC (platelet count), peripheral blood smear, platelet function tests (aggregation tests), immunologic tests (antiplatelet antibodies), bone marrow examination (if necessary), genetic tests (JAK2/MPL/CALR, etc., when platelet counts are elevated).
• Treatment for low platelets (bleeding risk):
  • Mild cases (asymptomatic or with minor bleeding): remove the cause and monitor the progress.
  • Immune thrombocytopenia (ITP): oral corticosteroids (prednisone); IVIG if necessary (for acute bleeding); platelet production stimulators (Romiplostim, Eltrombopag) for chronic or refractory cases; consider splenectomy.
  • Active bleeding or a very low platelet count: platelet transfusion, local hemostatic procedures, and adjunctive antifibrinolytic agents (tranexamic acid).
  • Renal or hepatic dysfunction-related functional impairment: control the underlying disease (e.g., increasing dialysis), and desmopressin (DDAVP) may be partially effective.
• Platelet dysfunction (including drug-induced cases):
  • Stop or adjust suspected medications (aspirin, NSAIDs, etc.).
  • In cases of severe bleeding, platelet transfusion or hemostatic adjuncts.
• Thrombocytosis (thrombosis risk):
  • Reactive (underlying infection or after surgery): treat the underlying cause and monitor the progress.
  • Essential thrombocythemia: depending on risk level, low-dose aspirin (for thrombosis prevention), cytoreductive therapy (hydroxyurea, anagrelide, etc.), platelet removal if necessary (in emergencies), and biomarker testing (JAK2, etc.).
• Lifestyle management and precautions:
  • If there is a risk of bleeding, avoid anticoagulants, antiplatelet drugs, and NSAIDs (consult a doctor).
  • Inform the doctor of a history of platelet disorders before invasive procedures, dental treatment, or surgery.
  • Vaccination before splenectomy (pneumococcal, meningococcal, influenza, etc.) and education about the risk of infection after surgery.
• Prognosis: Varies depending on the cause and severity. Drug-induced and reactive changes are reversible, while chronic diseases or bone marrow disorders require long-term management.

Outpatient Visit Checklist (Including Preparation Items and Sample Questions)

• Preparation items and information:
  • Recent blood test results (including CBC) and the dates of testing (if possible, trends in previous values).
  • A list of medications currently being taken (including prescription drugs, over-the-counter drugs, and supplements), especially aspirin, NSAIDs, anticoagulants, and anticancer drugs.
  • A record of recent bleeding symptoms (bleeding site, onset, duration, triggering factors), and history of surgery, dental treatment, or childbirth.
  • Whether there has been a previous transfusion, immunotherapy, or splenectomy, and a history of chronic diseases (liver, kidney, or bone marrow disorders).
  • Family history (bleeding disorders or platelet disorders).
  • Whether you are pregnant or planning a pregnancy (pregnancy affects diagnosis and treatment).
• Sample questions to take notes on during the outpatient visit:
  • What trend has my recent platelet count shown? What additional tests are needed?
  • Are there any medications or supplements I am currently taking that I should stop?
  • What immediate lifestyle measures can I take to reduce the risk of bleeding?

Examples of General Questions to Ask the Doctor

• What tests do you recommend to determine the cause of this condition?
• How high is my risk of bleeding (or thrombosis)? Is treatment necessary?
• What treatment options do you recommend for me, and what are their side effects?
• What preparations should I make before undergoing surgery or dental treatment?
• What is the long-term prognosis, and how often should I have regular follow-up?

Examples of Condition-Specific Questions

• Regarding low platelets (bleeding tendency):
  • "What tests are needed to determine whether my thrombocytopenia is immune-related (ITP), and what do you recommend as initial treatment?"
• Regarding high platelets (thrombosis risk):
  • "Is genetic testing (such as JAK2) needed to determine whether the cause of my high platelet count is essential thrombocythemia? How would treatment differ depending on the test results?"

(Note: Treatment and testing vary depending on the individual’s condition and medical history. Please consult your treating medical professionals regarding actual management and decision-making.)