Coronary Artery Bypass SurgeryPhase 2/3NCT02482857
Optimal Dose of Acetylsalicylic Acid After Coronary Artery Bypass Grafting
A Phase 2/3 study testing Acetylsalicylic acid in people with Coronary Artery Bypass Surgery and Stable Angina, run by Karolinska University Hospital.
Trial summary
This is a single-center, open-label, randomized controlled trial. Patients with stable angina pectoris without use of dual antiplatelet therapy or anticoagulation therapy scheduled for coronary artery bypass grafting (CABG) at Karolinska University Hospital in Stockholm, Sweden will be eligible. Read more about this study
- Who is it for?
- Ages 18 years and older
- Conditions the study is for
- Coronary Artery Bypass Surgery, Stable Angina
- What is being tested?
- Acetylsalicylic acid
- Could I receive a placebo?
- No, everyone receives an active treatment
- How many people
- 45 participants
- Where
- No sites listed yet
- Study dates
- Dec 2011to Jul 2015
- Phase
- Phase 2/3
- Are there results?
- None posted in the registry
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 years and older
- All sexes
- No healthy volunteers
- Adult, Older adult
Who may be able to join
- Stable coronary artery disease
- ≥18 years of age
- Scheduled to undergo elective CABG surgery
- Willing to participate and able to provide informed consent
Who cannot join
- Intake of drugs other than ASA that are known to influence platelet function, including nonsteroidal anti-inflammatory drugs (NSAIDs, including COX-2 selective anti-inflammatory drugs), GPIIbIIIa inhibitors, clopidogrel, dipyridamole, warfarin or acenocoumarol within 7 days of enrolment
- Hemorrhagic diathesis or known platelet dysfunction
- Chronic renal failure requiring dialysis
- Platelet count outside the 100 000 to 450 000/μL range
- Haemoglobin < 8g/dl
About this study
This is a single-center, open-label, randomized controlled trial. Patients with stable angina pectoris without use of dual antiplatelet therapy or anticoagulation therapy scheduled for coronary artery bypass grafting (CABG) at Karolinska University Hospital in Stockholm, Sweden will be eligible.
This study investigates in patients having undergone CABG whether increasing the dose or the frequency of acetylsalicylic acid (ASA) treatment improves the efficacy of ASA regarding platelet inhibition compared to the standard dosing for cardiovascular prevention (75 mg once daily) in the first three months after surgery. Patients will be randomly assigned to postoperative ASA dose 75mg once daily, 75mg twice daily or 160 mg once daily. The study dose ASA will be started at hospital discharge and continued of three months. Blood samples for serum thromboxane B2 (TxB2) and other analyses will be taken before surgery, before discharge, and after one and three months. All available data will be collected prospectively. Informed consent will be obtained from patients meeting the inclusion criteria before the initiation of any study-specific procedures.
- Conditions
- Coronary Artery Bypass Surgery, Stable Angina
- Being tested
- Acetylsalicylic acid
- Medical subject headings
- Angina, Stable
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
Acetylsalicylic acidDrug
Also called Aspirin
To compare BID dosing with OD dosing with clinically used aspirin dosages.
| Study group | Role | What they receive |
|---|---|---|
| Acetylsalicylic acid 75 mg twice daily | Experimental | Aspirin 75 mg BID is a new experimental dosing regimen which has shown improved efficiency regarding laboratory parameters in several studies, mainly in diabetic patients. Receives: Drug: Acetylsalicylic acid |
| Acetylsalicylic acid 160 mg once daily | Active comparator | Aspirin 160 mg OD is an accepted and used dosage after CABG. Receives: Drug: Acetylsalicylic acid |
| Acetylsalicylic acid 75 mg once daily | Active comparator | Aspirin 75 mg OD is an accepted and used dosage after CABG. Receives: Drug: Acetylsalicylic acid |
What is being measured
The primary outcome is the main question the study is designed to answer.
Serum thromboxane B2
Measured: 3 months
Secondary outcomes (1)
Multiple electrode aggregometry platelet aggregation
Measured: 3 months
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted26 Jun 2015 (estimated)
- Study startDec 2011
- Primary completionJul 2015
- Study completionJul 2015
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Other trials for Coronary Artery Bypass SurgeryStudies of the same condition, open and under way.
- More trials run by Karolinska University HospitalThe 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 2/3
- Primary purpose
- Treatment
- Allocation
- Randomised
- Intervention model
- Parallel groups
- Masking
- None (open label)
- Enrolment
- 45 participants (actual)
Sponsor and investigators
- Lead sponsor
- Karolinska University Hospital
- Sponsor type
- University, hospital or other
- Collaborators
- Karolinska Institutet
- Responsible party
- Principal investigator, Magnus Dalén, Karolinska University Hospital
- Investigators
- Paul Hjemdahl, Professor, Principal investigator, Karolinska University Hospital
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT02482857
- Sponsor's protocol ID
- ASA-dos
- Status last verified
- Mar 2018
- First submitted
- 24 Jun 2015
- Last updated
- 8 Mar 2018
- Results posted
- No
- Data monitoring committee
- Yes
Study at a glance
From the registry record, last updated by the sponsor on 8 Mar 2018. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- Optimal Dose of Acetylsalicylic Acid After Coronary Artery Bypass Grafting
- ClinicalTrials.gov ID
- NCT02482857
- Acronym / sponsor ID
- ASA-dos
- Conditions
- Coronary Artery Bypass Surgery, Stable Angina
- Phase
- Phase 2/3
- Study type
- Interventional
- Recruitment status
- Completed
- Enrolment
- 45 participants (actual)
- Lead sponsor
- Karolinska University HospitalUniversity, hospital or other
- Collaborators
- Karolinska Institutet
- Study start
- Dec 2011
- Primary completion
- Jul 2015 (actual)
- Study completion
- Jul 2015 (actual)
- First posted
- 26 Jun 2015 (estimated)
- 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.
This is a single-center, open-label, randomized controlled trial. Patients with stable angina pectoris without use of dual antiplatelet therapy or anticoagulation therapy scheduled for coronary artery bypass grafting (CABG) at Karolinska University Hospital in Stockholm, Sweden will be eligible.
This study investigates in patients having undergone CABG whether increasing the dose or the frequency of acetylsalicylic acid (ASA) treatment improves the efficacy of ASA regarding platelet inhibition compared to the standard dosing for cardiovascular prevention (75 mg once daily) in the first three months after surgery. Patients will be randomly assigned to postoperative ASA dose 75mg once daily, 75mg twice daily or 160 mg once daily. The study dose ASA will be started at hospital discharge and continued of three months. Blood samples for serum thromboxane B2 (TxB2) and other analyses will be taken before surgery, before discharge, and after one and three months. All available data will be collected prospectively. Informed consent will be obtained from patients meeting the inclusion criteria before the initiation of any study-specific procedures.
Study design
- Primary purpose
- Treatment
- Allocation
- Randomised
- Intervention model
- Parallel groups
- Masking
- None (open label)
- Number of arms
- 3
| Arm | Type | Receives |
|---|---|---|
| Acetylsalicylic acid 75 mg twice daily | Experimental | Drug: Acetylsalicylic acidAspirin 75 mg BID is a new experimental dosing regimen which has shown improved efficiency regarding laboratory parameters in several studies, mainly in diabetic patients. |
| Acetylsalicylic acid 160 mg once daily | Active comparator | Drug: Acetylsalicylic acidAspirin 160 mg OD is an accepted and used dosage after CABG. |
| Acetylsalicylic acid 75 mg once daily | Active comparator | Drug: Acetylsalicylic acidAspirin 75 mg OD is an accepted and used dosage after CABG. |
Who may qualify
- Ages
- 18 years and older
- Sex
- All
- Healthy volunteers
- Not accepted
- Age groups
- Adult, Older adult
Key inclusion criteria (4 listed)
- Stable coronary artery disease
- ≥18 years of age
- Scheduled to undergo elective CABG surgery
- Willing to participate and able to provide informed consent
Key exclusion criteria (5 listed)
- Intake of drugs other than ASA that are known to influence platelet function, including nonsteroidal anti-inflammatory drugs (NSAIDs, including COX-2 selective anti-inflammatory drugs), GPIIbIIIa inhibitors, clopidogrel, dipyridamole, warfarin or acenocoumarol within 7 days of enrolment
- Hemorrhagic diathesis or known platelet dysfunction
- Chronic renal failure requiring dialysis
- Platelet count outside the 100 000 to 450 000/μL range
- Haemoglobin < 8g/dl
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 |
|---|---|---|
| Acetylsalicylic acidAlso: AspirinTo compare BID dosing with OD dosing with clinically used aspirin dosages. | Drug | Acetylsalicylic acid 160 mg once daily, Acetylsalicylic acid 75 mg once daily, Acetylsalicylic acid 75 mg twice daily |
Primary outcome
Serum thromboxane B2
Time frame: 3 months
1 secondary outcome
Multiple electrode aggregometry platelet aggregation
Time frame: 3 months
Results and safety
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 8 Mar 2018.
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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. This study is not recruiting at the moment.
Paul Hjemdahl, Professor principal investigator
Karolinska University Hospital
Questions about this trial
What is this clinical trial studying?
A Phase 2/3 study testing Acetylsalicylic acid in people with Coronary Artery Bypass Surgery and Stable Angina, run by Karolinska University Hospital.
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 4 inclusion and 5 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: finished, as of the sponsor's last update on 8 Mar 2018. Status can change between updates, so confirm with the study contact before making plans.
What are the possible benefits and risks?
They depend on the study and the treatment, and no study can promise a benefit. 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 2 studies give the treatment to a larger group to see whether it has the intended effect and to keep checking safety.
Phase 3 studies compare the treatment with the current standard treatment or a placebo in a large group, to confirm how well it works and watch for side effects.
Not every study follows the same path, and some studies (observational studies, device studies) have no phase.
Are results available for this study?
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
How can a doctor refer a patient or contact the research team?
The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
Serum thromboxane B2 (time frame: 3 months). 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 8 Mar 2018; AzTrials last refreshed its copy on 8 Nov 2026.