Cerebral injury during paediatric heart surgery: perfusion issues

Area of Science:

• Pediatric Cardiology
• Neurodevelopmental Science
• Cardiovascular Surgery

Background:

• Suboptimal neurodevelopmental outcomes are prevalent in children with congenital heart disease (CHD).
• The etiology of these outcomes is frequently multifactorial, involving complex interactions.
• Cardiopulmonary bypass (CPB) during surgical correction is a significant area of investigation.

Purpose of the Study:

• To review the role of cardiopulmonary bypass in influencing neurodevelopmental outcomes in pediatric CHD.
• To identify key CPB-related factors that impact brain development.
• To discuss current strategies and potential future directions for neuroprotection.

Main Methods:

• Literature review focusing on studies examining CPB in pediatric CHD and neurodevelopment.
• Analysis of factors including hypothermia, circulatory arrest, flow rates, and physiological parameters.
• Synthesis of findings from clinical practice and preclinical animal studies.

Main Results:

• Hypothermia is a primary method for cerebral protection during CPB.
• Low flow and regional low flow strategies are often favored over deep hypothermic circulatory arrest.
• Numerous factors during CPB, such as cooling/rewarming, pH, air emboli, inflammatory response, hematocrit, oxygenation, glucose, and ultrafiltration, can affect neurodevelopment.

Conclusions:

• While no pharmacological agents have proven beneficial in clinical practice for neurodevelopmental outcomes, animal studies on steroids show promise.
• Optimizing CPB management, including temperature, flow, and physiological parameters, is crucial for improving neurodevelopmental outcomes in children with CHD.
• Further research is needed to translate promising preclinical findings into effective clinical neuroprotective strategies.