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 type | Interventional |
|---|---|
| Ages | 18 Years and up |
| Sex | All |
| Enrollment | 100 (estimated) |
| Sponsor | Ottawa Hospital Research Institute Academic / other |
| Locations | 2 sites (Calgary, Alberta and 1 other locations) |
| Status | Recruiting |
| Started | March 31, 2022 |
| Main results expected | March 2027 |
| Study ends | October 2027 |
| Registry record updated | October 2, 2026 |
| Trial ID | NCT05290857 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
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How to take part
- Review the eligibility criteria above with your treating physician.
- Check the official listing on ClinicalTrials.gov for the latest contact details and recruitment status.
- Contact the study coordinator or principal investigator to ask for pre-screening. Pre-screening is free and never obligates you to enroll.