Related Experiment Video
Updated: Jun 22, 2026
Metabolic Support of Excised, Living Brain Tissues During Magnetic Resonance Microscopy Acquisition
Published on: October 18, 2017
Selective cerebral perfusion: real-time evidence of brain oxygen and energy metabolism preservation
Jorge D Salazar1, Ryan D Coleman, Stephen Griffith
1Division of Congenital Heart Surgery, Texas Children's Hospital, Baylor College of Medicine, Houston, TX 77030-2399, USA. jdsalaza@texaschildrens.org
Insights
Selective cerebral perfusion (SCP) protects brain metabolism during deep hypothermic circulatory arrest (DHCA) in pediatric cardiac surgery. Real-time monitoring shows SCP preserves oxygenation and prevents metabolic damage from DHCA.
Area of Science:
- Cardiovascular Surgery
- Pediatric Cardiac Surgery
- Neuroprotection
Background:
- Deep hypothermic circulatory arrest (DHCA) is a standard technique for complex pediatric cardiac operations.
- Limited data exist on the real-time effects of DHCA, with or without selective cerebral perfusion (SCP), on cerebral metabolism.
- Understanding these effects is crucial for optimizing patient outcomes.
Purpose of the Study:
- To investigate the real-time impact of DHCA with and without SCP on cerebral metabolism and oxygenation.
- To define the metabolic changes associated with DHCA and the protective effects of SCP.
- To establish a model for studying neuroprotective strategies in pediatric cardiac surgery.
Main Methods:
- Piglets underwent cardiopulmonary bypass and were assigned to either DHCA (n=9) or DHCA with SCP (n=8) at 18°C using pH-stat management.
- Cerebral microdialysis was used to monitor cellular ischemia and energy stores.
- Cerebral oxygen tension and intracranial pressure were continuously measured.
Main Results:
- SCP preserved brain oxygen tension compared to DHCA alone (p < 0.01).
- DHCA induced significant increases in lactate, glycerol, and lactate/pyruvate ratio, alongside glucose and pyruvate depletion (p < 0.001).
- SCP prevented these metabolic derangements, with strong correlation between oxygen levels and metabolic markers (p < 0.001).
Conclusions:
- Selective cerebral perfusion effectively preserves cerebral oxygenation during DHCA.
- SCP attenuates the significant cerebral metabolic disturbances caused by DHCA.
- Cerebral microdialysis offers valuable real-time metabolic feedback, aiding in the development of strategies to prevent brain injury in pediatric cardiac surgery.
Background:
Deep hypothermic circulatory arrest (DHCA) is commonly used for complex cardiac operations in children, often with selective cerebral perfusion (SCP). Little data exist concerning the real-time effects of DHCA with or without SCP on cerebral metabolism. Our objective was to better define these effects, focusing on brain oxygenation and energy metabolism.
Methods:
Piglets undergoing cardiopulmonary bypass were assigned to either 60 minutes of DHCA at 18 degrees C (n = 9) or DHCA with SCP at 18 degrees C (n = 8), using pH-stat management. SCP was administered at 10 mL/kg/min. A cerebral microdialysis catheter was implanted into the cortex for monitoring of cellular ischemia and energy stores. Cerebral oxygen tension and intracranial pressure also were monitored. After DHCA with or without SCP, animals were recovered for 4 hours off cardiopulmonary bypass.
Results:
With SCP, brain oxygen tension was preserved in contrast to DHCA alone (p < 0.01). Deep hypothermic circulatory arrest was associated with marked elevations of lactate (p < 0.01), glycerol (p < 0.01), and the lactate to pyruvate ratio (p < 0.001), as well as profound depletion of the energy substrates glucose (p < 0.001) and pyruvate (p < 0.001). These changes persisted well into recovery. With SCP, no significant cerebral microdialysis changes were observed. A strong correlation was demonstrated between cerebral oxygen levels and cerebral microdialysis markers (p < 0.001).
Conclusions:
Selective cerebral perfusion preserves cerebral oxygenation and attenuates derangements in cerebral metabolism associated with DHCA. Cerebral microdialysis provides real-time metabolic feedback that correlates with changes in brain tissue oxygenation. This model enables further study and refinement of strategies aiming to limit brain injury in children requiring complex cardiac operations.
