High-Ratio Plasma Resuscitation Reduces Mortality in Moderate Traumatic Brain Injury

Optimizing Hemostatic Resuscitation in Traumatic Brain Injury

Traumatic brain injury remains a primary driver of trauma-related mortality, often complicated by trauma-induced coagulopathy, a rapid systemic failure of the coagulation cascade that impairs clot formation following severe injury [1, 2]. While damage control resuscitation prioritizes physiological restoration over anatomical repair by emphasizing high ratios of fresh frozen plasma to red blood cells for life-threatening hemorrhage, the optimal fluid strategy for patients with concurrent head injuries remains a subject of intense clinical debate [3, 4]. Current international guidelines have trended toward more restrictive volume resuscitation to avoid complications like hemodilution or volume overload, yet the specific role of plasma in non-massively transfused brain injury patients is not well-established [5, 4]. Traditional laboratory markers often fail to capture the dynamic nature of these injuries, and while viscoelastic testing, a real-time assessment of clot formation and stability like thromboelastography, may predict mortality, evidence from randomized trials remains limited [6, 7, 8]. Addressing this gap, a large-scale analysis of 23,362 patients from the Trauma Quality Improvement Project database now demonstrates that high ratios of fresh frozen plasma are associated with lower 6-hour mortality in moderate and severe traumatic brain injury, with the most significant 30-day survival benefit observed in moderate cases [9].

Defining the Non-Massive Transfusion Cohort

To evaluate the impact of plasma administration on neurological trauma, researchers conducted a retrospective analysis using the American College of Surgeons Trauma Quality Improvement Project database, a national registry tracking clinical outcomes across participating trauma centers. The study identified 23,362 adult trauma patients aged 18 years or older treated between 2020 and 2021. Inclusion required a suspected traumatic brain injury, defined as a head Abbreviated Injury Scale score of 1 or higher. The Abbreviated Injury Scale is an anatomically based scoring system that ranks injury severity in specific body regions on a scale from minor to unsurvivable. Additionally, all included patients must have received at least one unit of blood product during their initial resuscitation. To isolate the effects of plasma ratios in patients who were not experiencing catastrophic exsanguination, the authors excluded patients with burn injuries, interfacility transfers, and those requiring massive transfusion, defined as receiving five or more units of red blood cell-containing products within the first four hours of arrival. Focusing on this non-massive transfusion cohort provides a clearer picture of resuscitation needs in patients with lower-volume bleeding, a common scenario in community and trauma center practice. The remaining cohort was stratified into three severity groups based on their head injury scores: 40.1 percent had mild traumatic brain injury (score of 1 to 2), 35.9 percent had moderate traumatic brain injury (score of 3 to 4), and 24.0 percent had severe traumatic brain injury (score of 5 to 6).

Quantifying Plasma Ratios and Statistical Controls

The investigators quantified the resuscitation strategy by calculating the fresh frozen plasma ratio, defined as the volume of fresh frozen plasma divided by the total volume of transfused blood products. Based on this metric, the study population was categorized into three distinct cohorts: patients who received no fresh frozen plasma, those in a low fresh frozen plasma group, and those in a high fresh frozen plasma group. To establish a rigorous threshold between the low and high categories, the authors utilized the median of all non-zero fresh frozen plasma ratios as the dividing line. This classification allowed the researchers to compare clinical outcomes across varying concentrations of plasma administered during the critical initial hours of care. To evaluate the impact of these ratios on patient survival, the authors employed multivariable logistic regression, a statistical method that estimates the probability of an outcome like mortality while adjusting for multiple independent variables to control for potential confounding factors. This model specifically assessed the association between fresh frozen plasma ratios and mortality at both the 6-hour and 30-day marks. To ensure the findings remained robust across different clinical scenarios, the researchers conducted subgroup analyses specifically on patients with isolated traumatic brain injury and performed sensitivity analyses that excluded recipients of whole blood. These additional analytical layers were designed to isolate the specific effect of plasma-heavy resuscitation on neurological injury outcomes, ensuring that the observed survival benefits were not artificially driven by whole blood administration or concurrent extracranial trauma.

Severity-Dependent Survival Benefits

The baseline mortality in this cohort underscores the high lethality of neurological trauma, with researchers observing an overall 6-hour mortality rate of 12.6 percent and an overall 30-day mortality rate of 32.4 percent. The analysis revealed that the timing and duration of any survival benefit were closely tied to the severity of the head injury. High fresh frozen plasma ratios were associated with lower 6-hour mortality in both moderate and severe traumatic brain injury groups. However, this early advantage did not universally translate into long-term recovery. A sustained 30-day survival benefit was observed only in the moderate traumatic brain injury group, suggesting that while aggressive plasma administration may initially stabilize severe cases, it may not alter the month-long trajectory for the most critically injured patients. In contrast, low fresh frozen plasma ratios decreased only early 6-hour mortality in moderate and severe traumatic brain injury, failing to provide any significant protection by the 30-day mark. Further validation through subgroup and sensitivity analyses, which isolated patients with head-only trauma and excluded those receiving whole blood, confirmed that the greatest survival benefit occurred in the moderate traumatic brain injury cohort. For the practicing clinician, these data provide actionable guidance for trauma bay resuscitation. The findings indicate that the association between fresh frozen plasma and mortality is not uniform across all head injuries. Instead, patients presenting with moderate head injuries, defined by a head Abbreviated Injury Scale score of 3 or 4, may derive the most significant clinical utility from a high-ratio plasma resuscitation strategy during the initial hours of care.

References

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