Clinical trial Recruiting at 2 sites Interventional Ages 18 and up

Assessing anticoagulation safety after gastrointestinal bleeding

Official title: Post-Bleed Management of Antithrombotic Therapy After Gastrointestinal Bleeding: Pilot Study and Registry (PANTHER-GI)

Run by Ottawa Hospital Research Institute · NCT05290857 · Data updated 2026-11-12

This study is testing a new way to safely restart blood thinners for patients who have had serious stomach bleeding to see how soon it can be done without causing more problems.

Quick facts

Study typeInterventional
Ages18 Years and up
SexAll
Enrollment100 (estimated)
SponsorOttawa Hospital Research Institute
Academic / other
Locations2 sites (Calgary, Alberta and 1 other locations)
StatusRecruiting
StartedMarch 31, 2022
Main results expectedMarch 2027
Study endsOctober 2027
Registry record updatedOctober 2, 2026
Trial IDNCT05290857 on ClinicalTrials.gov

Is this trial a fit for you?

Likely a good fit

Ideal candidates include adults aged 18 and older who have been hospitalized for acute major non-variceal gastrointestinal bleeding and require long-term anticoagulation.

Probably not a fit

Patients with mechanical heart valves, recent major transient risk factors for VTE, or those who have undergone surgical management of GI bleeding may not benefit from this study.

A plain-English reading of the study's rules. Only the study team can confirm whether you qualify.

What this trial studies

The PANTHER-GI Pilot Study aims to evaluate the feasibility of a standardized approach for resuming direct oral anticoagulants (DOACs) in patients who have experienced major gastrointestinal bleeding. This pilot study will focus on patients at moderate to high risk of re-bleeding and thrombosis, determining the optimal timeframe for resuming DOAC therapy based on individual thrombotic risk. Additionally, a parallel registry will be established to compare enrolled patients with those who are eligible but not participating, identifying barriers to enrollment.

Why it matters

Potential benefit: If successful, this study could provide a safer protocol for resuming anticoagulation therapy, reducing the risk of re-bleeding and thrombotic events in patients.

How similar studies have gone: Other studies have explored anticoagulation management after GI bleeding, but this specific approach is novel in its standardized protocol for DOAC resumption.

Who can join: the full rules

Show full inclusion / exclusion criteria
Inclusion Criteria:

All of the following criteria must be met for the patient to be eligible:

1. Male or female subjects aged 18 years or older
2. Hospitalized with acute major GI bleeding (defined as per ISTH criteria) while receiving OAC therapy (DOAC).
3. OAC therapy discontinued for current acute GI bleed
4. Ongoing indication for long-term anticoagulation of atrial fibrillation (moderate to high risk of stroke/systemic embolism with CHADS65 ≥ 1 OR CHA2DS2VASc score of 3 or higher) or VTE (as per clinical care team)

Exclusion Criteria:

1. Bleeding from esophageal varices
2. Low risk peptic ulcers (Forest IIc or III)
3. Mechanical heart valve
4. GI bleeding managed surgically (e.g. gastrectomy, colectomy)
5. Active gastrointestinal cancer (defined as per ISTH criteria)
6. Life expectancy from other causes of less than 3 months
7. Platelet count \< 50,000/µL (or \< 50x109/L)
8. Renal dysfunction (Creatine Clearance \<15 mL/min as calculated by the Cockcroft-Gault formula)
9. Unable or unwilling to provide informed consent and/or comply with follow-up requirements outlined within the consent form

Where it's running

  • Alberta Health Services - Peter Lougheed Center Endoscopy Unit
    Calgary, Alberta, Canada
    Recruiting
  • Ottawa Hospital Research Institute
    Ottawa, Ontario, Canada
    Recruiting

Study contacts

  • Principal investigator: Deborah M Siegal, MD MSc — Ottawa Hospital Research Institute
  • Study coordinator: Deborah M Siegal, MD
  • Email: dsiegal@toh.ca
  • Phone: 613-737-8899

Similar studies

Other studies for the same condition or treatment. Recruiting studies are listed first.

How to take part

  1. Review the eligibility criteria above with your treating physician.
  2. Check the official listing on ClinicalTrials.gov for the latest contact details and recruitment status.
  3. Contact the study coordinator or principal investigator to ask for pre-screening. Pre-screening is free and never obligates you to enroll.
Last reviewed 2026-11-14 by the Find a Trial editorial team. Information on this page is for educational purposes and is not medical advice. Always consult qualified healthcare professionals about clinical trial participation.