Platelet transfusion in spontaneous ICH on antiplatelets
Non surgical spontaneous ICH
Avoid routine platelet transfusion
Class III harm recommendation in some stroke guidelines based on PATCH trial
Planned neurosurgical intervention
Platelet transfusion often used to optimize hemostasis
Specialist directed strategy
Special Populations
Pregnancy
Pregnancy considerations
Gestational thrombocytopenia pattern
Mild thrombocytopenia usually greater than 70 x 10^9/L
No maternal bleeding
Preeclampsia HELLP evaluation
Hypertension and proteinuria
AST ALT elevation
Hemolysis markers
Treatment safety
IVIG compatible with pregnancy
Corticosteroids compatible with pregnancy
Delivery anesthesia planning
Neuraxial anesthesia platelet thresholds per obstetric anesthesia policy
Geriatric
Older adult considerations
Polypharmacy
Higher likelihood of drug induced thrombocytopenia
Falls and occult trauma risk
Lower threshold for CT head with low platelets
Malignancy and marrow failure prevalence
Smear blasts and pancytopenia triggers
Pediatrics
Pediatric considerations
Acute ITP common after viral illness
Observation reasonable if no significant bleeding and stable
Weight based dosing
IVIG 1 g per kg dosing
Steroid dosing per pediatric protocol
HUS considerations
Diarrhea associated bloody stool
Creatinine elevation and hemolysis markers
Background
Epidemiology
Epidemiology overview
Severe thrombocytopenia commonly defined as platelets less than 20 x 10^9/L
Spontaneous bleeding risk rises markedly below 10 x 10^9/L
ITP common cause of isolated thrombocytopenia
Often mucocutaneous bleeding phenotype
HIT uncommon but high thrombosis risk
Platelet nadir often 20 to 100 x 10^9/L rather than single digits
Pathophysiology
Mechanisms
Decreased production
Marrow suppression or infiltration
Nutritional deficiency
Increased destruction
Immune mediated
Drug dependent antibodies
Consumption
DIC
TTP microvascular platelet rich thrombi
Sequestration
Splenomegaly related pooling
Therapeutic Considerations
Treatment principles
Treat the cause while preventing hemorrhage
Platelet transfusion effectiveness varies by mechanism
ITP
Steroids and IVIG increase platelet count via immune modulation
TTP
Plasma exchange removes autoantibodies and replenishes ADAMTS13
Delay in plasma exchange associated with high mortality
HIT
Thrombosis driven by platelet activation
Platelet transfusion usually avoided unless bleeding
Patient Discharge Instructions
copy discharge instructions
Discharge instructions
Diagnosis and expectations
Low platelet count increases bleeding risk
Most bruising and petechiae improve as platelets recover
Medication and activity guidance
Avoid aspirin and NSAIDs unless specifically instructed
Avoid contact sports and high fall risk activities until cleared
Return now for
Any head injury
Severe headache
Weakness
Confusion
Vomiting blood
Black stools
Blood in urine
Heavy vaginal bleeding
Shortness of breath or chest pain
New leg swelling or pain
Follow up plan
Hematology follow up within 24 to 72 hours if arranged
Repeat blood work as directed
References
Clinical Guidelines and Consensus
Guideline sources
American Society of Hematology guidelines on immune thrombocytopenia
Steroids and IVIG as first line for significant bleeding or very low platelets
American Society of Hematology guidelines on heparin induced thrombocytopenia
4Ts pretest probability framework
Non heparin anticoagulation when intermediate or high probability
International Society on Thrombosis and Haemostasis guidance on DIC
ISTH DIC scoring system
Supportive transfusion for bleeding and low fibrinogen
Evidence Based Studies and Tools
Key evidence
PLASMIC score derivation and validation studies for predicting severe ADAMTS13 deficiency
Supports empiric plasma exchange in high risk presentations
PATCH trial on platelet transfusion in antiplatelet associated spontaneous intracerebral hemorrhage
Signal of harm in non surgical patients
AABB platelet transfusion guidance
Prophylactic transfusion threshold around 10 x 10^9/L in stable patients
Higher targets for procedures and critical bleeding sites
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