Bentracimab in Ticagrelor-treated Patients With Uncontrolled Bleeding or Requiring Urgent Surgery or Invasive Procedure

The study will consist of a Screening/Pre-treatment period, an on-site assignment to study treatment and administration, a Follow-up visit on (Day 3+1 and Day 7±1), a Final Follow-up visit (Day 35±3) and a Follow-up visit for intracranial hemorrhage (ICH) only patients (Day 90±10). Infusion of PB2452 will be initiated on Day 1 and will continue for approximately 16 hours for a total of 18 g. On Day 1, subjects who meet all the inclusion criteria and none of the exclusion criteria will receive an intravenous (IV) infusion comprised of an initial IV bolus of 6 grams (g) infused over 10 minutes for rapid reversal, followed immediately by a 6g IV loading infusion over 4 hours and then a 6 g IV maintenance infusion over 12 hours. This bentracimab (PB2452) regimen is expected to provide immediate reversal of the antiplatelet effects of ticagrelor within 5 minutes of the initiation of infusion that is sustained for 20-24 hours. In subjects with potential drug interaction from recent concomitant use of moderate or strong CYP3A inhibitors with ticagrelor, an alternative regimen may be used comprising administration of 36 g over an active treatment period of 24 hours and 10 min. (This alternative regimen will be an initial 12 g bolus infusion over 10 minutes, followed immediately by a loading infusion of 12 g over 6 hours which will then be followed by a maintenance regimen of 12 g infused over 18 hours for a total infusion of 36 grams over 24 hours and 10 minutes). In patients presenting with intracranial hemorrhage (ICH), brain imaging within 2 hours of initiation of study drug and at least one follow-up brain imaging performed 12-24 hours post completion of PB2452 will be required to support adjudication of hemostasis. All subjects may be discharged from the clinical site between Days 3 and 7 inclusive and will return for a Follow-up visit on Day 7, if already discharged, and on Day 35 (± 3 days). All ICH patients must complete End of Study (EOS) Day 35±3 (Visit 5). ICH patients that agree to participate in the ICH-only-90-day-follow-up visit will have an additional visit on Day 90±10 (Visit 6).