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Occurrence of Bleeding and Thrombosis During Antiplatelet Therapy in Non-cardiac Surgery (OBTAIN)

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details.
 
ClinicalTrials.gov Identifier: NCT01358422
Recruitment Status : Completed
First Posted : May 23, 2011
Last Update Posted : October 14, 2015
Sponsor:
Collaborators:
University of Leeds
Erasmus Medical Center
Information provided by (Responsible Party):
European Society of Anaesthesiology

Study Description
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Brief Summary:

Research questions:

  1. What is the absolute risk reduction for in-hospital major adverse cardiac events (MACE) associated with the use of dual anti-platelet therapy as compared with aspirin alone in this population?
  2. What is the absolute risk increase for clinically significant bleeding during the same period associated with the use of dual anti-platelet therapy as compared with aspirin alone in this population?

In brief the design of the study is as follows:

  • We will study patients undergoing non-cardiac surgery within four years of coronary stenting.
  • We will record the anti-platelet agents taken by patients before, during and after surgery.
  • We will record cardiac and bleeding events that occur whilst the patient is in hospital.
  • We will use the statistical technique of propensity scoring to match patients who have similar risk factors and who received different anti-platelet regimens.
  • We will compare the incidence of cardiac events and bleeding in the matched groups.

Condition or disease
Bleeding Thrombosis Cardiac Events

Detailed Description:
This study will compare the use of aspirin alone with dual antiplatelet therapy (i.e. aspirin and clopidogrel) in patients presenting for elective non-cardiac surgery who have undergone PCI with either bare metal stent or drug eluting stent placement in the four years prior to surgery. The absolute risk reduction in major adverse cardiac events (MACE) with dual antiplatelet therapy and the absolute risk increase for clinically significant bleeding events with dual therapy will be determined. This will allow the number needed to treat (NNT) for the prevention of MACE and the number needed to harm (NNH) for bleeding to be determined and the optimal antiplatelet therapy in this setting to be identified.
Study Design
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Study Type : Observational
Actual Enrollment : 830 participants
Observational Model: Cohort
Time Perspective: Prospective
Official Title: Occurrence of Bleeding and Thrombosis During Antiplatelet Therapy in Non-cardiac Surgery. A Prospective Observational Study (OBTAIN Study)
Study Start Date : October 2011
Actual Primary Completion Date : December 2013
Actual Study Completion Date : January 2014

Resource links provided by the National Library of Medicine


Groups and Cohorts
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Group/Cohort
In Patients


Outcome Measures
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Primary Outcome Measures :
  1. 1. MACE [ Time Frame: In-hospital stay up to 30 days ]

    This study will record and analyse in-hospital adverse cardiac events. Major Adverse Cardiac Events (MACE) will be defined as a composite of:

    1. Myocardial infarction as defined by the Universal Definition of Myocardial Infarction(including cardiac arrest and cardiac death as described in this definition).
    2. PCI for a cardiac event occurring following surgery.

  2. 2. Clinically significant bleeding [ Time Frame: In-hospital stay up to 30 days ]

    This study will record and analyse in-hospital clinically significant bleeding.

    Clinically Significant Bleeding Events will be defined as:

    1. Reoperation for bleeding.
    2. Gastrointestinal haemorrhage
    3. Intracranial haemorrhage
    4. Spinal/epidural haematoma. The transfusion of blood and blood products will also be recorded and compared between patients on dual antiplatelet therapy and aspirin alone.


Eligibility Criteria
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Ages Eligible for Study:   18 Years and older   (Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No
Sampling Method:   Probability Sample
Study Population
Patients undergoing non-cardiac surgery within four years of percutaneous coronary intervention (PCI) with the placement of a bare metal or drug eluting stent will be included in the study.
Criteria

Inclusion Criteria:

  • Patients undergoing non-cardiac surgery within four years of percutaneous coronary intervention (PCI) with the placement of a bare metal or drug eluting stent will be included in the study.

Exclusion Criteria:

  • Patients maintained on anticoagulant therapy e.g. heparin infusion before and after surgery will be excluded. (Patients receiving prophylactic doses of heparin for prevention of thromboembolic events will be eligible for inclusion.)
  • Patients receiving bridging therapy with full anticoagulant does of heparin or other drugs to compensate for the withdrawal of antiplatelet drugs will be excluded.
  • Patients who are anticoagulated with warfarin (INR>1.5 at the time of surgery) will be excluded.
  • Patients receiving full anticoagulation with heparin for a known recent a known thromboembolic event (APPT ratio > 1.5) be excluded. -
Contacts and Locations
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Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT01358422


Locations
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Germany
University Hospital Carl Gustav Carus
Dresden, Germany, 01307
Netherlands
Erasmus University
Rotterdam, Netherlands
United Kingdom
University of Leeds, Sectional of Translational Anaesthetic and Surgical Sciences
Leeds, United Kingdom, LS9 7TF
Sponsors and Collaborators
European Society of Anaesthesiology
University of Leeds
Erasmus Medical Center
Investigators
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Study Chair: Simon Howell, MD Sectional of Translational Anaesthetic and Surgical Sciences, University of Leeds, United Kingdom
More Information
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Publications:

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Responsible Party: European Society of Anaesthesiology
ClinicalTrials.gov Identifier: NCT01358422    
Other Study ID Numbers: OBTAIN
First Posted: May 23, 2011    Key Record Dates
Last Update Posted: October 14, 2015
Last Verified: October 2015
Keywords provided by European Society of Anaesthesiology:
Prospective observational study
major adverse cardiac events (MACE)
clinically significant bleeding events
Dual anti-platelet therapy
aspirin alone therapy
non-cardiac surgery
 percutaneous coronary intervention (PCI)
placement of a bare metal or drug eluting stent
OBTAIN
Simon Howell
ESA
European Society of Anaesthesiology
Additional relevant MeSH terms:
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Thrombosis
Cardiovascular Diseases
Hemorrhage
 Pathologic Processes
Embolism and Thrombosis
Vascular Diseases