HART (Heparin-Aspirin Reperfusion Trial)
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þ 200 patients treated with tPA within 4-6 hours; randomized to aspirin or IV
  heparin.

þ At 7 days, comparable proportion of arteries still open in both arms.

þ "To keep reperfused vessels open, must be very agressive with heparin: not
just subQ like in the European studies." [paraphrase; Jerris Hedges, M.D.]