Intravenous Thrombolysis for Acute Ischemic Stroke in Patients with Thrombocytopenia

Objective To determine the safety of intravenous (IV) recombinant tissue plasminogen activator (rtPA) in patients with acute ischemic stroke (AIS) who had a platelet count <100,000 /mm³. Methods We reviewed the charts of all patients who received IV rtPA for AIS during a 9.6-year period at our stroke center. Those with platelets <100,000/mm³ were identified. Head computed tomography scans performed in 24-36 hours postthrombolysis were reviewed to evaluate the rate of symptomatic intracranial hemorrhage (sICH). Results A total of 835 patients received IV rtPA for AIS during this period. A total of 5 patients were identified to have a platelet count <100,000/mm³. One of them (20%) developed sICH post-IV tPA administration.The mean platelet count of those 5 patients was 63,000 ± 19,000/mm³. To the best of our knowledge, only 21 thrombocytopenic patients have been reported to receive IV rtPA for AIS in the medical literature. Combining our 5 cases with 21 patients previously reported, we have 26 AIS patients who had a platelet count <100,000/mm³ and received IV rtPA, with 2 of them developing sICH (7.7 %). Comparing the rate of sICH among this group with the patients with normal platelet count in our cohort, there was no statistically significant difference (7.7% versus 6.04%, P value =.73). Conclusion IV rtPA for AIS might be safe in patients with platelet count <100,000/mm³ and it is reasonable not to delay IV rtPA administration while waiting for the platelet count result, unless there is strong suspicion for abnormal platelet count.