Body Mass Index as a Prognostic Factor in Traumatic Brain Injury: Insights from a Real-World Cohort

Area of Science:

• Neurotrauma research
• Obesity and health outcomes

Background:

• The link between obesity and traumatic brain injury (TBI) outcomes is complex and debated.
• While obesity often correlates with worse TBI outcomes, the "obesity paradox" suggests potential protective effects.

Purpose of the Study:

• To investigate the relationship between obesity and outcomes in patients with traumatic brain injury.
• To examine if higher body mass index (BMI) is associated with different complication rates or mortality in TBI patients.

Main Methods:

• Propensity score-matching was used to create cohorts of normal-weight and obese TBI patients.
• Outcomes including pneumonia, acute kidney injury, myocardial infarction, cognitive deficits, and mortality were compared using statistical analyses.

Main Results:

• Obesity was associated with a reduced risk of several complications, including pneumonia, acute kidney injury, myocardial infarction, cognitive deficits, and cardiac arrest.
• No significant difference in mortality rates was observed between normal-weight and obese TBI patients.
• The incidence of emergency department visits, admissions, and specific procedures was also lower in the obese cohort.

Conclusions:

• Findings support the obesity paradox in neurotrauma, showing a lower incidence of certain complications in obese TBI patients.
• Obesity did not translate to improved mortality or functional outcomes, suggesting BMI alone is insufficient to explain these complex relationships.
• Further research using comprehensive adiposity and metabolic measures is needed to understand the role of body composition in TBI recovery.