Delayed Versus Early Enoxaparin Prophylaxis After Traumatic Brain Injury (TBI)

Study Overview
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Brief Summary
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Brain injured patients are at high risk for forming blood clots in the legs and lungs. For non-brain injured trauma patients, we decrease the chances of these blood clots forming by placing the patients on a low dose of the blood thinner enoxaparin. Starting patients with a brain injury on the blood thinner is problematic, however, as this can theoretically cause the brain injury to worsen. Trauma surgeons wait a variable period of time before starting this blood thinner because waiting too long can result in the formation of these blood clots in the legs and lungs. Previous research has shown that some brain injuries which are of lower severity can have enoxaparin started at 24 hours after injury if the brain injury is stable on a repeated computed tomography (CT) scan of the head. This is a pilot study designed to look at the rates of worsening of brain injury if the low dose blood thinner is started at 24 versus 96 hours post-injury.

Detailed Description
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We propose to conduct a placebo-controlled non-inferiority pilot study to evaluate the rate of worsening of intracranial injury patterns after initiation of enoxaparin in TBI patients. Patient enrollment will occur at ETMC, blinded re-reading of CTs will occur at PMH, and administrative/analytical support will occur at UTSW. The study design will be a double-blind, randomized controlled trial in the ETMC Surgical Intensive Care Unit (SICU) consisting of 40 patients per arm. The decision for 80 patients was resource-based, as this is a pilot study. Further, we anticipate the need to contact 3 patients in order to obtain 1 successful recruitment. Each arm will consist of low-risk TBI patients (defined as patients with a subdural or epidural hematoma < 8mm, intraparenchymal contusion < 2 cm, and/or single contusion per lobe) who have had a CT scan of the head without contrast at 24 hours post-injury which documents a stable injury pattern. The severity of neurologic deficit will have no bearing on their suitability for participation, and will not be considered in inclusion/exclusion criteria. After documentation of a stable intracranial injury pattern at this time interval, patients will be randomized to receive either enoxaparin 30 mg SQ every 12 hours or placebo with each regimen being initiated at 24 hours post-injury. A follow-up CT scan of the brain without contrast will be obtained on all patients 48 hours post-injury (and 24 hours after the initiation of enoxaparin/placebo). An additional CT scan of the brain without contrast will be obtained on any patient who experiences an abrupt change in neurologic exam at any time between the initiation of enoxaparin/placebo and the end of the study's interventional period at 96 hours post-injury (this time frame was chosen as it is the earliest time point at which there is universal agreement among both of our group's practitioners that enoxaparin use is safe from the risks of TBI expansion). Any patient with a worsened CT scan will have their investigational treatment discontinued at that time. At 96 hours post-injury, the interventional portion of the study will end, data collection for the primary endpoint will cease, and all patients will be placed on enoxaparin for the remainder of their hospital stay as per local standards of care. Patient participation in the study will last from the time of injury to 96 hours post-injury for the interventional part of the study, and from 96 hours post-injury until discharge from ETMC for the observational portion. While this latter time frame is obviously extremely variable, it averages approximately one to two weeks. During both the interventional and observational time periods, patients will have Duplex ultrasonography of the lower extremities performed for an edematous extremity, CT-angiography of the chest for unexplained hypoxia or tachycardia, and ventilation-perfusion scanning for suspicion of PE in the presence of a contraindication to IV contrast.

Official Title
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The Delayed vs Early Enoxaparin Prophylaxis (DEEP) Study After Traumatic Brain Injury: A Randomized, Double-Blinded, Placebo Controlled Pilot Trial

Conditions
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Venous Thromboembolism, Traumatic Brain Injury

Intervention / Treatment
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* Drug: enoxaparin
* Drug: placebo


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: 1. Male and female patients admitted to the ETMC SICU with TBI who speak English or Spanish. Exclusion Criteria: Epidural or subdural hematoma > 8mm. Intraparenchymal contusion >2 cm Multiple contusions w/in one lobe Subarachnoid hemorrhage in basilar or supracellar cistern and positive CTA Increased TBI on 24 hr post-injury CT Spinal canal hematoma Nonoperative mgmt of American Association for the Surgery of Trauma (AAST) Grade IV or higher organ injury Gastrointestinal hemorrhage Ongoing bleeding from a pelvic fracture Anticipated open reduction of long bone or pelvic fracture within study period. Intracranial pressure (ICP) >20 mmHg Coagulopathy consisting of International Normalized Ratio (INR)>1.5 or platelet count <50,000 Expect brain death/discharge in 48 hrs Pre-existing dialysis dependence Documented DVT at time of admission Prisoners Pregnancy Age <18 years Terminally ill patients Anticoagulant use at time of injury Inability to gain consent from patient or legal next-of-kin in instance of TBI, intoxication, or psychiatric diagnoses Documented history of heparin allergy Initial head CT >6 hours post-injury

Ages Eligible for Study
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Minimum Age: 18 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Treatment
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Quadruple


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: enoxaparin 30 mg SQ q12 hours<br>Enoxaparin started at 24 hours post-injury and continued until 96 hours post-injury. | Drug: enoxaparin<br>* Enoxaparin 30 mg sq q 12 hours<br>|
| Placebo Comparator: placebo<br>vehicle administered sq q 12 hours | Drug: placebo<br>* vehicle<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Percentage of Participants With Worsening TBI Hemorrhage | Worsening of TBI hemorrhage pattern on any scheduled or PRN CT scans after the initiation of treatment | 24 hours after the start of treatment/48 hours after the time of injury | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Extracranial Hemorrhagic Complications | percentage of participants that have extracranial hemorrhagic complications | prior to discharge | 
| Count of Participants With Deep Vein Thrombosis (DVT) or Pulmonary Embolism (PE) |  | prior to discharge | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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venous thromboembolism, enoxaparin, traumatic brain injury, Venous thromboembolism prophylaxis traumatic brain injury