A piglet model for evaluation of cerebral blood flow and brain oxidative metabolism during gradual cerebral perfusion...

Area of Science:

• Neuroscience
• Pediatric Critical Care
• Physiology

Background:

• Elevated intracranial pressure (ICP) is a critical concern in neonates and infants.
• Understanding the impact of focal intracranial mass expansion on cerebral hemodynamics is vital for effective treatment.
• Existing models may not fully replicate the dynamic changes seen in acute ICP elevation.

Purpose of the Study:

• To develop and validate a piglet model for studying epidural volume expansion's effects on cerebral perfusion pressure (CPP).
• To investigate the relationship between stepwise increases in ICP and regional cerebral blood flow.
• To provide a platform for evaluating therapeutic strategies for managing elevated ICP.

Main Methods:

• A piglet model (n=10) was utilized, inducing epidural volume expansion via a parietal balloon.
• Intracranial pressure (ICP) was stepwise increased to 25, 35, and 45 mm Hg, with mean arterial blood pressure (ABP) controlled.
• Regional cerebral blood flow was measured using the colored microsphere technique; cerebral oxygen delivery and metabolic rate were calculated.

Main Results:

• Epidural volume expansion reproducibly reduced CPP to 70%, 50%, and 33% of baseline at elevated ICP levels.
• Physiological variables remained stable throughout the ICP increases, indicating model reliability.
• The model successfully simulated the hemodynamic consequences of acute intracranial focal mass expansion.

Conclusions:

• The developed piglet model accurately mimics acute intracranial focal mass expansion.
• This model is suitable for evaluating therapeutic interventions aimed at managing elevated ICP in pediatric populations.
• The findings underscore the significant reduction in CPP associated with increasing ICP due to focal mass effect.