Systemic sepsis exacerbates mild post-traumatic brain injury in the rat

Area of Science:

• Neuroscience
• Immunology
• Critical Care Medicine

Background:

• Sepsis is a common complication following traumatic brain injury (TBI).
• This complication is linked to poorer neurological and overall patient outcomes.
• Understanding sepsis's impact on TBI is crucial for improving patient care.

Purpose of the Study:

• To investigate the effects of sepsis on outcomes in a rat model of mild traumatic brain injury (TBI).
• To characterize the influence of sepsis on mortality, neurological function, and neuropathology post-TBI.

Main Methods:

• A combined in vivo model using Controlled Cortical Impact (CCI) for TBI and Cecal Ligation and Puncture (CLP) for sepsis in rats.
• Evaluation of mortality, body weight, motor function (beam balance), cognitive function (Morris water maze), and histopathology (lesion volume, cell counts, glial activation) over 14 days.

Main Results:

• Mild TBI alone caused transient weight loss, motor, and cognitive deficits, with cortical lesions and hippocampal cell loss.
• Superimposed sepsis exacerbated mortality, weight loss, motor deficits, and cognitive impairments.
• Sepsis significantly increased neuronal cell death in the CA3 hippocampal area and activated microglia.

Conclusions:

• Sepsis significantly worsens the progression of damage and neurological deficits following traumatic brain injury.
• The combined TBI-sepsis model highlights the detrimental synergistic effects on brain injury and recovery.
• Findings underscore the importance of managing sepsis aggressively in TBI patients.