Post-operative Atrial Fibrillation (POAF)Phase 1/2NCT05991700
Anthocyanin-Rich Table Grape Powder for Prophylaxis of Post-Operative Atrial Fibrillation
A Phase 1/2 study testing Freeze-Dried California Table Grape in people with Post-operative Atrial Fibrillation (POAF), run by University of Michigan at 1 site in United States.
Trial summary
Postoperative atrial fibrillation (POAF) is a common complication following cardiac surgery and leads to worse outcomes. POAF is thought to be caused by the inflammatory state following cardiac surgery. Read more about this study
- Who is it for?
- Ages 18 to 79 years
- Conditions the study is for
- Post-operative Atrial Fibrillation (POAF)
- What is being tested?
- Freeze-Dried California Table Grape
- Could I receive a placebo?
- Yes, some participants may receive a placebo
- How many people
- 70 participants
- Where
- 1 siteUnited States
- Study dates
- 23 Mar 2026to Aug 2027
- Phase
- Phase 1/2
- Are there results?
- Not yet: the study is under way
Key requirements
Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.
- Ages 18 to 79 years
- All sexes
- No healthy volunteers
- Adult, Older adult
Who may be able to join
- Males and female patients (age 50-79) at the Mitral Valve Clinic/CVC undergoing elective cardiac surgery for mitral valve repair without the Cox MAZE procedure (MVR patients also undergoing CABG and/or tricuspid valve repair are also eligible)
- In sinus rhythm (no pre-operative atrial fibrillation)
Who cannot join
- Age ≥ 80 years
- Diagnosed pre-operative chronic or paroxysmal AF
- Prior ablation procedure for AF
- Previous cardiac surgery
- Implanted pacemaker
- Active smoker
Show all 12Show fewer
- Comorbidities such as congenital or cardiac re-operation
- Use of antiarrhythmic agents
- Active inflammatory or infectious disease or malignancy
- Diagnosed autoimmune disease
- Corticosteroid or other immunomodulatory or immunosuppressive medication
- Risk factors for POAF including low ejection fraction (EF) (EF<50%), left atrial (LA) dilation (LA>5.0 cm), and high degree of mitral regurgitation (grade 3-4).
Trial locations and contacts
1 site in 1 country. Contact the study team or a site near you to ask about taking part.
United States1 site, 1 recruiting
- Recruiting
University of Michigan - Michigan Medicine
Ann Arbor, Michigan, 48109
China Green, BS, 734-936-7731, chjgreen@med.umich.edu
Steven F Bolling, MD
About this study
Postoperative atrial fibrillation (POAF) is a common complication following cardiac surgery and leads to worse outcomes. POAF is thought to be caused by the inflammatory state following cardiac surgery. It may be that anti-inflammatory medications could lower the occurrence of POAF, however many typical anti-inflammatory medications, such as ibuprofen, are contraindicated in the post cardiac surgery patient due to increased risks of bleeding. If a drug was identified with anti-inflammatory properties with minimal deleterious side effects, this could be broadly applied to cardiac surgery patients for the prevention of POAF. Interestingly, several small trials have shown that medications that alter transcription of inflammatory markers lead to decreased POAF. Furthermore, we have shown that phytochemicals, such as those found in grapes, have excellent bioavailability and can affect cardiac gene transcription related to inflammation. In this study, we propose to evaluate the efficacy of preoperative administration of concentrated grape powder in the prevention of POAF.
Read the detailed description
Voluntary recruitment hold pending approval of new protocol.
- Being tested
- Freeze-Dried California Table Grape, Placebo
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
Freeze-Dried California Table GrapeDrug
Consume 2 servings (30.66g/serving) per day for three days before cardiac surgery
PlaceboDrug
Consume 2 servings (30.66g/serving) per day for three days before cardiac surgery
| Study group | Role | What they receive |
|---|---|---|
| Concentrated grape powder | Experimental | Not described Receives: Drug: Freeze-Dried California Table Grape |
| Placebo | Placebo comparator | Not described Receives: Drug: Placebo |
What is being measured
The primary outcome is the main question the study is designed to answer.
POAF-related events during initial hospital stay and within 30 days after surgery
Measured: 30 days
Atrial transcripts related to NFκB activation; Impact on NIDDM, Angiotensin II
Measured: 30 days
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted15 Aug 2023
- Study start23 Mar 2026
- Primary completionAug 2027 (estimated)
- Study completionAug 2027 (estimated)
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Other trials for Post-operative Atrial Fibrillation (POAF)Studies of the same condition, open and under way.
- More trials run by University of MichiganThe sponsor's other registered studies.
- What the trial phases meanHow a treatment moves from first tests in people to approval.
More details
For doctors and researchers: how the study is designed, who runs it, and its registry IDs.
Study design
- Study type
- Interventional
- Phase
- Phase 1/2
- Primary purpose
- Prevention
- Allocation
- Randomised
- Intervention model
- Parallel groups
- Masking
- Single blind
- Who is masked
- Participant
- Enrolment
- 70 participants (estimated)
Sponsor and investigators
- Lead sponsor
- University of Michigan
- Sponsor type
- University, hospital or other
- Collaborators
- California Table Grape Commission
- Responsible party
- Principal investigator, Steven Bolling, University of Michigan
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT05991700
- Sponsor's protocol ID
- HUM00211419
- Status last verified
- Apr 2026
- First submitted
- 7 Aug 2023
- Last updated
- 27 Apr 2026
- Results posted
- No
- FDA-regulated drug
- Yes
- FDA-regulated device
- No
- Individual data sharing
- No
Study at a glance
From the registry record, last updated by the sponsor on 27 Apr 2026. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- Anthocyanin-Rich Table Grape Powder for Prophylaxis of Post-Operative Atrial Fibrillation
- ClinicalTrials.gov ID
- NCT05991700
- Acronym / sponsor ID
- HUM00211419
- Phase
- Phase 1/2
- Study type
- Interventional
- Recruitment status
- Recruiting
- Enrolment
- 70 participants (estimated)
- Lead sponsor
- University of MichiganUniversity, hospital or other
- Collaborators
- California Table Grape Commission
- Study start
- 23 Mar 2026 (actual)
- Primary completion
- Aug 2027 (estimated)
- Study completion
- Aug 2027 (estimated)
- First posted
- 15 Aug 2023 (actual)
- Results
- Not posted in the source record
Clinical summary
The research question as the sponsor registered it. This describes what the study plans to test, not what it found.
Postoperative atrial fibrillation (POAF) is a common complication following cardiac surgery and leads to worse outcomes. POAF is thought to be caused by the inflammatory state following cardiac surgery. It may be that anti-inflammatory medications could lower the occurrence of POAF, however many typical anti-inflammatory medications, such as ibuprofen, are contraindicated in the post cardiac surgery patient due to increased risks of bleeding. If a drug was identified with anti-inflammatory properties with minimal deleterious side effects, this could be broadly applied to cardiac surgery patients for the prevention of POAF. Interestingly, several small trials have shown that medications that alter transcription of inflammatory markers lead to decreased POAF. Furthermore, we have shown that phytochemicals, such as those found in grapes, have excellent bioavailability and can affect cardiac gene transcription related to inflammation. In this study, we propose to evaluate the efficacy of preoperative administration of concentrated grape powder in the prevention of POAF.
Detailed description
Voluntary recruitment hold pending approval of new protocol.
Study design
- Primary purpose
- Prevention
- Allocation
- Randomised
- Intervention model
- Parallel groups
- Masking
- Single blind (participant)
- Number of arms
- 2
| Arm | Type | Receives |
|---|---|---|
| Concentrated grape powder | Experimental | Drug: Freeze-Dried California Table Grape |
| Placebo | Placebo comparator | Drug: Placebo |
Who may qualify
- Ages
- 18 to 79 years
- Sex
- All
- Healthy volunteers
- Not accepted
- Age groups
- Adult, Older adult
Key inclusion criteria (2 listed)
- Males and female patients (age 50-79) at the Mitral Valve Clinic/CVC undergoing elective cardiac surgery for mitral valve repair without the Cox MAZE procedure (MVR patients also undergoing CABG and/or tricuspid valve repair are also eligible)
- In sinus rhythm (no pre-operative atrial fibrillation)
Key exclusion criteria (12 listed)
- Age ≥ 80 years
- Diagnosed pre-operative chronic or paroxysmal AF
- Prior ablation procedure for AF
- Previous cardiac surgery
- Implanted pacemaker
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Interventions
| Intervention | Type | Arms |
|---|---|---|
| Freeze-Dried California Table GrapeConsume 2 servings (30.66g/serving) per day for three days before cardiac surgery | Drug | Concentrated grape powder |
| PlaceboConsume 2 servings (30.66g/serving) per day for three days before cardiac surgery | Drug | Placebo |
Primary outcome
POAF-related events during initial hospital stay and within 30 days after surgery
Time frame: 30 days
Atrial transcripts related to NFκB activation; Impact on NIDDM, Angiotensin II
Time frame: 30 days
Results and safety
This study is still under way. Results are not available in the source record yet.
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 27 Apr 2026.
- Individual participant dataSharing planned: No
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Referral and contact
AzTrials does not enrol participants or take referrals. Contact the study team or a site listed below; they decide who can take part.
1 site in 1 country: see every site and its status.
Questions about this trial
What is this clinical trial studying?
A Phase 1/2 study testing Freeze-Dried California Table Grape in people with Post-operative Atrial Fibrillation (POAF), run by University of Michigan at 1 site in United States.
The full registered description is in the About this study section and the official record.
Who may be eligible to take part?
The sponsor lists 2 inclusion and 12 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.
Is this clinical trial currently recruiting?
The record says: looking for participants now, as of the sponsor's last update on 27 Apr 2026. Status can change between updates, so confirm with the study contact before making plans.
Where is the study taking place?
The record lists 1 site in United States. Whether a site is taking part right now should be confirmed with that site. See every site.
What are the possible benefits and risks?
They depend on the study and the treatment, and no study can promise a benefit. Some participants in this study may receive a placebo. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.
What does this combined phase mean?
Phase 1 studies test a treatment in a small group of people for the first time or in a new way, mainly to check safety and find the right dose.
Phase 2 studies give the treatment to a larger group to see whether it has the intended effect and to keep checking safety.
Not every study follows the same path, and some studies (observational studies, device studies) have no phase.
Are results available for this study?
This study is still under way. Results are not available in the source record yet.
How can a doctor refer a patient or contact the research team?
Contact China Green, BS (734-936-7731, chjgreen@med.umich.edu), or a site near the patient. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
POAF-related events during initial hospital stay and within 30 days after surgery (time frame: 30 days). The study lists 2 primary outcomes in all. It is what the study was designed to measure, not a finding.
Where can I read the original study information?
Does a listing mean the treatment is approved or proven to work?
No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.
How often is this information updated?
AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 27 Apr 2026; AzTrials last refreshed its copy on 7 Nov 2026.