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AzTrials

Coronary DiseaseNCT00420667

Low Molecular Weight Heparin vs Unfractionated Heparin at Cardiac Surgery

A study testing Enoxaparin in people with Coronary Disease and Coronary Artery Bypass Grafting, run by G. d'Annunzio University at 1 site in Italy.

Completed

Finished. The study has ended and is not enrolling. Results may be posted on the official record.

Official record
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Trial summary

Because the impairment of platelet function may cause excess peri-operative bleeding, pre-operative aspirin discontinuation and heparin bridging are common at cardiac surgery. We aimed to evaluate the impact of a low-molecular-weight-heparin (LMWH), enoxaparin, and unfractionated heparin (UFH) on coagulation… Read more about this study

Who is it for?
Ages 35 to 75 years
What is being tested?
Enoxaparin
How many people
43 participants
Where
1 siteItaly
Study dates
Nov 2004to May 2005
Phase
Interventional
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 35 to 75 years
  • All sexes
  • No healthy volunteers
  • Adult, Older adult

Who may be able to join

  • Patients aged 35-75 years with 3-vessel coronary artery disease (CAD)
  • Candidates to elective CABG

Who cannot join

  • Other additional (valve, carotid, etc.) simultaneous surgery required,
  • Off-pump surgery,
  • Any altered liver and kidney laboratory parameters,
  • A history of any haemorrhagic disorders,
  • Platelet count <100,000 and >450.000/μL,
  • Treatment with ticlopidine or clopidogrel in the last month.

Trial locations and contacts

1 site in 1 country.

Italy1 site

  • Institute of Cardiology - S. Camillo Hospital

    Chieti, CH, 66100

Other trials in Italy

About this study

Official title: Effect of Low Molecular Weight Heparin vs Unfractionated Heparin on Bleeding After Cardiac Surgery

Because the impairment of platelet function may cause excess peri-operative bleeding, pre-operative aspirin discontinuation and heparin bridging are common at cardiac surgery. We aimed to evaluate the impact of a low-molecular-weight-heparin (LMWH), enoxaparin, and unfractionated heparin (UFH) on coagulation parameters and peri-operative bleeding in patients undergoing elective coronary artery bypass grafting (CABG) surgery after aspirin discontinuation.

The specific hypothesis of this study was that a 12 h interval is sufficient not to cause excess peri-operative bleeding, and is therefore an optimal compromise between antithrombotic efficacy and haemorrhagic safety.

Read the detailed description

Since LMWH provide many pharmacokinetic advantages compared with UFH, and since they are a valid substitution for UFH in a number of settings, such as non-ST elevation acute coronary syndromes and prevention of venous thromboembolism, LMWH may provide a useful bridge to revascularization after aspirin discontinuation in patients undergoing CABG surgery. Obstacles to the spreading of this practice are mainly the absence of solid evidence of equivalence (or superiority) as to efficacy in this setting, and the proof of equal safety, namely the absence of excess bleeding because some studies have suggested an increased number of haemorrhagic complications after LMWH, particularly with the use of higher doses. This might here be a problem, as patients are here generally at high risk of thrombotic events and for this reason need higher doses than for prevention of venous thromboembolism.

Being tested
Enoxaparin
Keywords
unfractionated heparin, enoxaparin, low molecular weight heparin, bypass surgery, bleeding
Medical subject headings
Coronary Disease, Hemorrhage

What participants receive

What participants receive. In a randomised study each person is assigned to one group by chance.

What is being measured

The primary outcome is the main question the study is designed to answer.

  1. Haemoglobin Concentration

  2. Haematocrit

  3. Platelet count

  4. Transfusion Units

Timeline

From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.

  1. First posted11 Jan 2007 (estimated)
  2. Study startNov 2004
  3. Primary completionMar 2005
  4. Study completionMay 2005

Resources

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 N/A
Primary purpose
Treatment
Allocation
Randomised
Intervention model
Parallel groups
Masking
None (open label)
Enrolment
43 participants (actual)
IDs, dates and publications
ClinicalTrials.gov ID
NCT00420667
Sponsor's protocol ID
001
Status last verified
Jan 2007
First submitted
8 Jan 2007
Last updated
14 Nov 2022
Results posted
No

Publications

  • Eagle KA, Guyton RA, Davidoff R, Edwards FH, Ewy GA, Gardner TJ, Hart JC, Herrmann HC, Hillis LD, Hutter AM Jr, Lytle BW, Marlow RA, Nugent WC, Orszulak TA; American College of Cardiology; American Heart Association. ACC/AHA 2004 guideline update for coronary artery bypass graft surgery: a report of the American College of Cardiology/American Heart Association Task Force on Practice Guidelines (Committee to Update the 1999 Guidelines for Coronary Artery Bypass Graft Surgery). Circulation. 2004 Oct 5;110(14):e340-437. No abstract available.

    PubMed 15466654

  • Goldman S, Zadina K, Moritz T, Ovitt T, Sethi G, Copeland JG, Thottapurathu L, Krasnicka B, Ellis N, Anderson RJ, Henderson W; VA Cooperative Study Group #207/297/364. Long-term patency of saphenous vein and left internal mammary artery grafts after coronary artery bypass surgery: results from a Department of Veterans Affairs Cooperative Study. J Am Coll Cardiol. 2004 Dec 7;44(11):2149-56. doi: 10.1016/j.jacc.2004.08.064.

    PubMed 15582312

  • Mangano DT; Multicenter Study of Perioperative Ischemia Research Group. Aspirin and mortality from coronary bypass surgery. N Engl J Med. 2002 Oct 24;347(17):1309-17. doi: 10.1056/NEJMoa020798.

    PubMed 12397188

  • Dacey LJ, Munoz JJ, Johnson ER, Leavitt BJ, Maloney CT, Morton JR, Olmstead EM, Birkmeyer JD, O'Connor GT; Northern New England Cardiovascular Disease Study Group. Effect of preoperative aspirin use on mortality in coronary artery bypass grafting patients. Ann Thorac Surg. 2000 Dec;70(6):1986-90. doi: 10.1016/s0003-4975(00)02133-0.

    PubMed 11156107

  • Ferraris VA, Ferraris SP. 1988: Preoperative aspirin ingestion increases operative blood loss after coronary artery bypass grafting. Updated in 1995. Ann Thorac Surg. 1995 Apr;59(4):1036-7. doi: 10.1016/0003-4975(95)00023-e. No abstract available.

    PubMed 7695387

  • Karthik S, Grayson AD, McCarron EE, Pullan DM, Desmond MJ. Reexploration for bleeding after coronary artery bypass surgery: risk factors, outcomes, and the effect of time delay. Ann Thorac Surg. 2004 Aug;78(2):527-34; discussion 534. doi: 10.1016/j.athoracsur.2004.02.088.

    PubMed 15276512

  • Sethi GK, Copeland JG, Goldman S, Moritz T, Zadina K, Henderson WG. Implications of preoperative administration of aspirin in patients undergoing coronary artery bypass grafting. Department of Veterans Affairs Cooperative Study on Antiplatelet Therapy. J Am Coll Cardiol. 1990 Jan;15(1):15-20. doi: 10.1016/0735-1097(90)90168-o.

    PubMed 2404046

  • Sirvinskas E, Veikutiene A, Grybauskas P, Cimbolaityte J, Mongirdiene A, Veikutis V, Raliene L. Influence of aspirin or heparin on platelet function and postoperative blood loss after coronary artery bypass surgery. Perfusion. 2006 Jan;21(1):61-6. doi: 10.1191/0267659106pf845oa.

    PubMed 16485701

  • Hirsh J, Raschke R. Heparin and low-molecular-weight heparin: the Seventh ACCP Conference on Antithrombotic and Thrombolytic Therapy. Chest. 2004 Sep;126(3 Suppl):188S-203S. doi: 10.1378/chest.126.3_suppl.188S.

    PubMed 15383472

  • Petersen JL, Mahaffey KW, Hasselblad V, Antman EM, Cohen M, Goodman SG, Langer A, Blazing MA, Le-Moigne-Amrani A, de Lemos JA, Nessel CC, Harrington RA, Ferguson JJ, Braunwald E, Califf RM. Efficacy and bleeding complications among patients randomized to enoxaparin or unfractionated heparin for antithrombin therapy in non-ST-Segment elevation acute coronary syndromes: a systematic overview. JAMA. 2004 Jul 7;292(1):89-96. doi: 10.1001/jama.292.1.89.

    PubMed 15238596

  • Clark SC, Vitale N, Zacharias J, Forty J. Effect of low molecular weight heparin (fragmin) on bleeding after cardiac surgery. Ann Thorac Surg. 2000 Mar;69(3):762-4; discussion 764-5. doi: 10.1016/s0003-4975(99)01366-1.

    PubMed 10750757

  • Prandoni P. Heparins and venous thromboembolism: current practice and future directions. Thromb Haemost. 2001 Jul;86(1):488-98.

    PubMed 11487039

  • Mismetti P, Laporte S, Darmon JY, Buchmuller A, Decousus H. Meta-analysis of low molecular weight heparin in the prevention of venous thromboembolism in general surgery. Br J Surg. 2001 Jul;88(7):913-30. doi: 10.1046/j.0007-1323.2001.01800.x.

    PubMed 11442521

  • Jones HU, Muhlestein JB, Jones KW, Bair TL, Lavasani F, Sohrevardi M, Horne BD, Doty D, Lappe DL. Preoperative use of enoxaparin compared with unfractionated heparin increases the incidence of re-exploration for postoperative bleeding after open-heart surgery in patients who present with an acute coronary syndrome: clinical investigation and reports. Circulation. 2002 Sep 24;106(12 Suppl 1):I19-22.

    PubMed 12354703

  • Burger W, Chemnitius JM, Kneissl GD, Rucker G. Low-dose aspirin for secondary cardiovascular prevention - cardiovascular risks after its perioperative withdrawal versus bleeding risks with its continuation - review and meta-analysis. J Intern Med. 2005 May;257(5):399-414. doi: 10.1111/j.1365-2796.2005.01477.x.

    PubMed 15836656

Questions about this trial

What is this clinical trial studying?

A study testing Enoxaparin in people with Coronary Disease and Coronary Artery Bypass Grafting, run by G. d'Annunzio University at 1 site in Italy.

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 6 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 14 Nov 2022. 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 Italy. 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. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.

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?

Haemoglobin Concentration. The study lists 4 primary outcomes in all. It is what the study was designed to measure, not a finding.

Where can I read the original study information?

On the ClinicalTrials.gov record for NCT00420667, which also lists 16 linked publications.

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 14 Nov 2022.

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