Discontinuation of Antithrombotic Treatment Following Patent Foramen Ovale Closure in Young Patients With Cryptogenic Stroke (HALTI)

March 23, 2026 updated by: Josep Rodes-Cabau

Discontinuation of Antithrombotic Treatment Following Patent Foramen Ovale Closure in Young Patients With Cryptogenic Stroke. The HALTI Trial

To determine the safety of antithrombotic treatment discontinuation 12 months following successful transcatheter PFO closure.

Study Overview

Status

Status

Indicates the current recruitment status or the expanded access status.
Recruiting

Conditions

Conditions

The disease, disorder, syndrome, illness, or injury that is being studied. On ClinicalTrials.gov, conditions may also include other health-related issues, such as lifespan, quality of life, and health risks.

Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.

Detailed Description

Young patients with a cryptogenic ischemic event undergoing transcatheter PFO closure exhibit a low but clinically relevant risk of bleeding (overall and major bleeding) at long-term follow-up, eventually exceeding the risk of ischemic events.

Importantly, the vast majority of major bleeding events seem to occur in patients receiving antiplatelet therapy. Preliminary data suggest that antiplatelet therapy discontinuation is not associated with any increase in ischemic events, and could potentially translate into a lower rate of major bleeding events at longer term follow-up. We therefore hypothesize that in young patients without any other comorbidities increasing the risk of stroke, shorter-term (≤1 year instead of lifelong) antiplatelet treatment could be a safe option following PFO closure.

Study Type

Study Type

Describes the nature of a clinical study. Study types include interventional studies (also called clinical trials), observational studies (including patient registries), and expanded access.
Interventional

Enrollment (Estimated)

Enrollment

The number of participants in a clinical study. The "anticipated" enrollment is the target number of participants that the researchers need for the study.
100

Phase

Phase

The stage of a clinical trial studying a drug or biological product, based on definitions developed by the U.S. Food and Drug Administration (FDA). The phase is based on the study's objective, the number of participants, and other characteristics. There are five phases: Early Phase 1 (formerly listed as Phase 0), Phase 1, Phase 2, Phase 3, and Phase 4. Not Applicable is used to describe trials without FDA-defined phases, including trials of devices or behavioral interventions.
  • Not Applicable

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Contact

Study Contact

The name and contact information for the person who can answer enrollment questions for a clinical study. Each location where the study is being conducted may also have a specific contact, who may be better able to answer those questions.

Study Contact Backup

Study Locations

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Eligibility Criteria

The key requirements that people who want to participate in a clinical study must meet or the characteristics they must have. Eligibility criteria consist of both inclusion criteria (which are required for a person to participate in the study) and exclusion criteria (which prevent a person from participating). Types of eligibility criteria include whether a study accepts healthy volunteers, has age or age group requirements, or is limited by sex.

Ages Eligible for Study

18 years to 60 years (Adult)

Accepts Healthy Volunteers

Yes

Description

Inclusion Criteria:

  • Successful transcatheter PFO closure with any approved device
  • Patients ≤60 years diagnosed with a cryptogenic stroke/TIA who have undergone successful transcatheter PFO closure

Exclusion Criteria:

->60 year-old

  • RoPE score <6
  • Residual shunt ≥moderate following PFO closure
  • Atrial fibrillation following PFO closure
  • Presence of ≥2 cardiovascular risk factors (smoking, hypertension, dyslipidemia)
  • Diabetes mellitus
  • Thrombophilia (factor V Leiden, factor II mutation, anticardiolipin antibodies, lupus anticoagulant, anti-b2 glycoprotein-I antibodies, protein C deficiency, protein S deficiency)
  • Recurrent cerebrovascular event (stroke, TIA) within the year following PFO closure
  • Failure to provide signed informed consent
  • Absolute contraindications for an MRI study

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Prevention
  • Allocation: N/A
  • Interventional Model: Single Group Assignment
  • Masking: None (Open Label)

Arms and Interventions

Participant Group / Arm

Participant Group / Arm

A group or subgroup of participants in a clinical trial that receives a specific intervention/treatment, or no intervention, according to the trial's protocol.
Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.
Experimental: Antiplatelet treatment discontinuation
At 12 months post-PFO closure, patients will discontinue the antiplatelet treatment. All patients will undergo a clinical evaluation and cerebral MRI at 12 months (before antiplatelet treatment cessation) and at 24 months post-PFO closure.
Other: Antiplatelet treatment discontinuation
All patients will undergo a clinical evaluation and cerebral MRI at 12 months (before antiplatelet treatment cessation) and at 24 months post-PFO closure.

What is the study measuring?

Primary Outcome Measures

Primary Outcome Measures

In a clinical study's protocol, the planned outcome measure that is the most important for evaluating the effect of an intervention/treatment. Most clinical studies have one primary outcome measure, but some have more than one.
Outcome Measure
Measure Description
Time Frame
Presence of new stroke events
Time Frame: 12 months
1)Acute episode of a focal or global neurological deficit with at least one of the following: change in level of consciousness, hemiplegia, hemiparesis, numbness or sensory loss affecting one side of the body, dysphasia or aphasia, hemianopia, amaurosis fugax or other new neurological symptom(s) consistent with stroke.(2)Duration of a focal or global neurological deficit ≥ 24 hours OR < 24 hours if available neuroimaging documents a new hemorrhage or infarct; OR the neurological deficit results in death.
12 months
Presence of new ischemic lesions
Time Frame: 24-month follow-up
Evaluated by MRI
24-month follow-up

Secondary Outcome Measures

Secondary Outcome Measures

In a clinical study's protocol, a planned outcome measure that is not as important as the primary outcome measure for evaluating the effect of an intervention but is still of interest. Most clinical studies have more than one secondary outcome measure.
Outcome Measure
Measure Description
Time Frame
Number of new cerebral ischemic lesions
Time Frame: 24-month follow-up
Evaluated by MRI
24-month follow-up
Volume of new cerebral ischemic lesions
Time Frame: 24-month follow-up
Evaluated by MRI
24-month follow-up
Number of ischemic events
Time Frame: 24-month follow-up
Stroke, TIA
24-month follow-up
Number of ischemic events
Time Frame: 3-year follow-up
Stroke, TIA
3-year follow-up
Number of ischemic events
Time Frame: 4-year follow-up
Stroke, TIA
4-year follow-up
Number of ischemic events
Time Frame: 5-year follow-up
Stroke, TIA
5-year follow-up
Number of ischemic events
Time Frame: 6-year follow-up
Stroke, TIA
6-year follow-up
Number of ischemic events
Time Frame: 7-year follow-up
Stroke, TIA
7-year follow-up
Number of ischemic events
Time Frame: 8-year follow-up
Stroke, TIA
8-year follow-up
Number of ischemic events
Time Frame: 9-year follow-up
Stroke, TIA
9-year follow-up
Number of ischemic events
Time Frame: 10-year follow-up
Stroke, TIA
10-year follow-up
Rate of bleeding
Time Frame: 24-month follow-up
Life-threatening, major or minor bleeding
24-month follow-up
Rate of bleeding
Time Frame: 3-year follow-up
Life-threatening, major or minor bleeding
3-year follow-up
Rate of bleeding
Time Frame: 4-year follow-up
Life-threatening, major or minor bleeding
4-year follow-up
Rate of bleeding
Time Frame: 5-year follow-up
Life-threatening, major or minor bleeding
5-year follow-up
Rate of bleeding
Time Frame: 6-year follow-up
Life-threatening, major or minor bleeding
6-year follow-up
Rate of bleeding
Time Frame: 7-year follow-up
Life-threatening, major or minor bleeding
7-year follow-up
Rate of bleeding
Time Frame: 8-year follow-up
Life-threatening, major or minor bleeding
8-year follow-up
Rate of bleeding
Time Frame: 9-year follow-up
Life-threatening, major or minor bleeding
9-year follow-up
Rate of bleeding
Time Frame: 10-year follow-up
Life-threatening, major or minor bleeding
10-year follow-up

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Sponsor

The organization or person who initiates the study and who has authority and control over the study.
Josep Rodes-Cabau

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Actual)

Study Start

The actual date on which the first participant was enrolled in a clinical study. The "anticipated" study start date is the date that the researchers think will be the study start date.
July 8, 2020

Primary Completion (Estimated)

Primary Completion

The date on which the last participant in a clinical study was examined or received an intervention to collect final data for the primary outcome measure. Whether the clinical study ended according to the protocol or was terminated does not affect this date. For clinical studies with more than one primary outcome measure with different completion dates, this term refers to the date on which data collection is completed for all the primary outcome measures. The "anticipated" primary completion date is the date that the researchers think will be the primary completion date for the study.
June 1, 2026

Study Completion (Estimated)

Study Completion

The date on which the last participant in a clinical study was examined or received an intervention/treatment to collect final data for the primary outcome measures, secondary outcome measures, and adverse events (that is, the last participant's last visit). The "anticipated" study completion date is the date that the researchers think will be the study completion date.
August 1, 2032

Study Registration Dates

First Submitted

First Submitted

The date on which the study sponsor or investigator first submitted a study record to ClinicalTrials.gov. There is typically a delay of a few days between the first submitted date and the record's availability on ClinicalTrials.gov (the first posted date).
July 14, 2020

First Submitted That Met QC Criteria

First Submitted That Met QC Criteria

The date on which the study sponsor or investigator first submits a study record that is consistent with National Library of Medicine (NLM) quality control (QC) review criteria. The sponsor or investigator may need to revise and submit a study record one or more times before NLM's QC review criteria are met. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
July 14, 2020

First Posted (Actual)

First Posted

The date on which the study record was first available on ClinicalTrials.gov after National Library of Medicine (NLM) quality control (QC) review has concluded. There is typically a delay of a few days between the date the study sponsor or investigator submitted the study record and the first posted date.
July 17, 2020

Study Record Updates

Last Update Posted (Actual)

Last Update Posted

The most recent date on which changes to a study record were made available on ClinicalTrials.gov. There may be a delay between when the changes were submitted to ClinicalTrials.gov by the study's sponsor or investigator (the last update submitted date) and the last update posted date.
March 24, 2026

Last Update Submitted That Met QC Criteria

Last Update Submitted That Met QC Criteria

The most recent date on which the study sponsor or investigator submitted changes to a study record that are consistent with National Library of Medicine (NLM) quality control (QC) review criteria. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
March 23, 2026

Last Verified

Last Verified

The most recent date on which the study sponsor or investigator confirmed the information about a clinical study on ClinicalTrials.gov as accurate and current. If a study with a recruitment status of recruiting; not yet recruiting; or active, not recruiting has not been confirmed within the past 2 years, the study's recruitment status is shown as unknown.
March 1, 2026

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

Other Study ID Numbers

Identifiers or ID numbers other than the NCT number that are assigned to a clinical study by the study's sponsor, funders, or others. These numbers may include unique identifiers from other trial registries and National Institutes of Health grant numbers.
  • HALTI

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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