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Sponsored by: |
Shaare Zedek Medical Center |
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Information provided by: | Shaare Zedek Medical Center |
ClinicalTrials.gov Identifier: | NCT00351663 |
The purpose of this study is to evaluate the efficacy of 3 different dosing regimens of enoxaparin in achieving adequate antithrombotic aFXa levels in critically ill patients.
The relationship between appearance of DVT and antithrombotic aFXa levels will also be assessed and risk factors associated with inadequate aFXa levels under standard enoxaparin dosages will be searched for.
Condition | Intervention | Phase |
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Venous Thrombosis Critical Illness |
Drug: Enoxaparine |
Phase IV |
Study Type: | Interventional |
Study Design: | Prevention, Randomized, Single Blind, Dose Comparison, Parallel Assignment, Pharmacokinetics Study |
Official Title: | Prospective Randomised Study of the Effect of Vasopressors on the Anti Xa Response to Enoxaparin in Critically Ill Patients |
Estimated Enrollment: | 100 |
Study Start Date: | February 2007 |
Estimated Study Completion Date: | May 2007 |
Critically ill patients are at increased risk of venous thrombosis and embolism from DVT. Low molecular weigh heparins such as enoxaparin (clexane) have more favorable pharmacokinetic/ pharmacodynamic profiles, equivalent or improved efficacy (e.g. in post trauma and orthopedic surgery patients) and fewer bleeding complications than low-dose unfractionated heparin. These medications are currently recommended for DVT prophylaxis in critically ill patients and are usually administered subcutaneously (SQ). The antithrombotic activity of LMWHs correlates with peak aFXa levels. However, the the appropriate dose and dosing interval of enoxaparin for DVT prophylaxis in critically ill surgical patients has not been established and in particular remains unknown for those patients with severe peripheral edema ans/or decreased peripheral circulation due to therapy with vasopressors. Several studies have recently demonstrated questionable efficacy of standard daily enoxaparin dosing for critically ill patients as DVT prophylaxis.
The current study will be a prospective, randomized, cohort study, conducted at the Shaare Zedek Medical Center over a period of 1 year (100 patients). All critically ill patients aged ≥18 years with a predicted requirement of mechanical ventilation for >3 days will be included. Data collection will be performed anonymously and will include patient demographics and admission details, duplex monitoring for DVT and daily recording of APACHE II scores, renal function, coagulation profile and overall dose of vasopressors.
Patients will be randomized to receive enoxaparin in accordance three DVT prophylaxis protocols- IV by weight, SQ by weight or SQ 40mg x1/day (standard). Blood samples for the evaluation of aFXa will be drawn twice daily for peak and trough activity over a period of 5 days. No further changes will be made in the standard therapy. Patient outcomes and occurrence of adverse events will be recorded. The principle outcome variable will be achievement of target peak and trough levels of aFXa during the 5 day study period.
Ages Eligible for Study: | 18 Years and older |
Genders Eligible for Study: | Both |
Accepts Healthy Volunteers: | No |
Inclusion Criteria:
All critically ill patients, aged ≥18 years, with a predicted requirement for mechanical ventilation of more than 3 days and for whom venous thromboembolic prophylaxis is indicated.
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Exclusion Criteria:
Patients requiring full anticoagulation Administration of unfractionated heparin in the 8hrs preceding study entry Existing contraindication to prophylactic dose of enoxaparin. Platelets< 75,000 Significant renal failure (creatinine clearance <30 ml/min/m2) [39] BMI>30 INR >1.7 Any conditions precluding treatment in the opinion of the primary physician Patient /surrogate refusal
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Contact: Sharon Einav-Bromiker, MD | 972-508-685480 | einav_s@szmc.org.il |
Contact: Shoshana Zevin, MD | 972-508-685091 | szevin@szmc.org.il |
Israel | |
Shaare Zedek Medical Center | Recruiting |
Jerusalem, Israel, 91031 | |
Contact: Sharon Einav-Bromiker, MD 972-508-685480 einav_s@szmc.org.il |
Principal Investigator: | Sharon Einav-Bromiker, MD | Shaare Zedek Medical Center |
Study ID Numbers: | einav-1-ctil |
Study First Received: | July 12, 2006 |
Last Updated: | May 1, 2007 |
ClinicalTrials.gov Identifier: | NCT00351663 |
Health Authority: | Israel: Israeli Health Ministry Pharmaceutical Administration |
Venous Thrombosis Critical Illness Blood Coagulation Factor Xa |
Embolism and Thrombosis Embolism Critical Illness Heparin, Low-Molecular-Weight |
Vascular Diseases Venous Thrombosis Thrombosis Enoxaparin |
Fibrin Modulating Agents Disease Attributes Anticoagulants Pathologic Processes Molecular Mechanisms of Pharmacological Action Therapeutic Uses |
Hematologic Agents Fibrinolytic Agents Cardiovascular Diseases Cardiovascular Agents Pharmacologic Actions |