Timing Of venous thromboembolism Prophylaxis for adult patients with Traumatic Brain Injury (TOP-TBl): a pragmatic, randomised trial

Doctors cannot agree on the safest time to give blood-thinning drugs to patients with traumatic brain injury. These drugs, called pharmacological thromboprophylaxis (PTP), prevent dangerous blood clots in the legs and lungs, but they also raise the risk of bleeding inside the skull—a direct conflict in a patient whose brain may already be bleeding. Current guidelines offer no clear answer, so clinical practice varies wildly from hospital to hospital. The TOP-TBI trial directly tackles this uncertainty by randomly assigning adult patients with traumatic brain injury to receive PTP either early or late after their injury. The trial is pragmatic, meaning it follows real-world hospital care rather than a tightly controlled laboratory setting, and it compares both clinical outcomes and cost-effectiveness. If the results show that one timing is clearly superior, hospitals could adopt a standard protocol, reducing both preventable clots and unnecessary bleeds. This would change a decision that emergency and intensive care teams face daily, quietly shaping survival and recovery for thousands of head-injury patients across the NHS.