Tranexamic acid for intoxicated adults with head trauma and anisocoria
Anisocoria is not an indication by itself for tranexamic acid (TXA). TXA is recommended for patients with head injury and GCS ≤12 when no active extracranial bleeding is thought to be present, given as soon as possible within 2 hours of injury and before imaging (NICE Head injury NG232, Class/Level not stated in the recommendation text). [1]
In intoxicated patients with impaired consciousness, intoxication should not be assumed as the cause until an important traumatic brain injury has been excluded. [1]
For major trauma, TXA should not be given more than 3 hours after injury in the absence of evidence of hyperfibrinolysis (NICE Major trauma NG39). [2]
Medication selection algorithm
TXA should be considered under the following head-injury conditions (age ≥16 years): [1]
- Head injury with Glasgow Coma Scale (GCS) score of 12 or less. [1]
- No active extracranial bleeding is thought to be present. [1]
TXA should not be used to delay other immediate life-saving care. [1]
Key evidence supporting this recommendation
In the CRASH-3 randomized placebo-controlled trial subgroup treated early (within 3 hours), head injury death occurred in 18.5% with TXA and 19.8% with placebo. [3]
In patients with mild or moderate traumatic brain injury, CRASH-3 demonstrated a 20% reduction in deaths with TXA. [3]
Monotherapy vs combination therapy
TXA should be used as an adjunct to standard head-injury care rather than as a replacement for stabilization and appropriate resuscitation. [1]
Important clarifications and nuances
An intoxication history should not be used to dismiss traumatic brain injury in the setting of impaired consciousness. [1]
Extracranial bleeding suspected or confirmed should redirect management to major-trauma haemorrhage guidance rather than the isolated head-injury TXA recommendation. [1]
Treatment initiation thresholds
For head injury (age ≥16 years) with GCS ≤12 and no suspected active extracranial bleeding, a 2 g intravenous bolus of TXA should be given as soon as possible within 2 hours of injury and before imaging. [1]
For major trauma, TXA should not be given more than 3 hours after injury unless there is evidence of hyperfibrinolysis. [2]
Common pitfalls to avoid
Attributing low consciousness solely to intoxication without excluding traumatic brain injury. [1]
Delaying TXA beyond the recommended time window for head injury (2 hours) or beyond 3 hours for major trauma without evidence of hyperfibrinolysis. [1], [2]
Target goals of therapy
TXA administration targets reduction in death from traumatic brain injury when given early in appropriately selected patients. [1], [3]