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

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.

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Key information

Conditions

Bleeding Cardiac Events Cardiovascular Diseases Embolism and Thrombosis Hemorrhage Pathologic Processes Pathological Conditions, Signs and Symptoms Thrombosis Vascular Diseases

Age range

18 year and older

Sex eligibility

All sexes

Study type

Observational

Primary location

University Hospital Carl Gustav Carus, Dresden, Germany

About this study

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.

Who can participate

Healthy volunteers accepted: No

Only the study team can determine whether someone qualifies for participation.

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. -

Treatment and study plan

Primary outcomes

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:
- Myocardial infarction as defined by the Universal Definition of Myocardial Infarction(including cardiac arrest and cardiac death as described in this definition).
- PCI for a cardiac event occurring following surgery.
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:
- Reoperation for bleeding.
- Gastrointestinal haemorrhage
- Intracranial haemorrhage
- 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.

Sponsors and collaborators

Lead sponsor

European Society of Anaesthesiology

Other

Collaborators

Erasmus Medical Center
University of Leeds

Registry information

Official study title

Occurrence of Bleeding and Thrombosis During Antiplatelet Therapy in Non-cardiac Surgery. A Prospective Observational Study (OBTAIN Study)

Acronym: OBTAIN

Important dates

Study start: 2011
Primary completion: 2013
Study completion: 2014
First posted: May 23, 2011
Registry last updated: Oct 14, 2015

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

Published trials that share one or more normalized conditions with this study.

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