Transient Changes in Cerebral Tissue Oxygen, Glucose, and Temperature by Microstrokes: A Computational Study

Area of Science:

• Neuroscience
• Biomedical Engineering
• Computational Biology

Background:

• Microstroke events cause critical disruptions in brain physiology.
• Understanding these disruptions is key to assessing stroke severity and patient outcomes.

Purpose of the Study:

• To evaluate disruptions in physiological parameters during microstroke events.
• To assess the severity of microstroke based on these physiological changes.

Main Methods:

• Developed a mathematical model to simulate changes in cerebral tissue pO2, glucose, and temperature.
• Incorporated variations in cerebral blood flow (CBF), capillary density, blood oxygen/glucose levels, and ambient temperature.

Main Results:

• Complete blood flow obstruction allows limited glucose, potentially causing acidosis.
• Partial obstructions decrease tissue pO2, with minimal glucose impact; reduced CBF/capillary density increases hypoxia risk.
• Capillary density significantly affects stroke severity by influencing both pO2 and glucose levels.
• Hypoxia/hypoglycemia or hypoxia/hyperglycemia can co-occur, worsening outcomes.
• Temperature effects were minimal in deep brain regions but noticeable near the skull.

Conclusions:

• The model offers insights into factors driving severe stroke outcomes.
• Identifies key physiological parameters (hypoxia, hypoglycemia, hyperglycemia, temperature) influencing stroke severity.