Pediatric and congenital heart surgery perfusion considerations, including circuit priming and deep hypothermic circulatory arrest.
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- Why is circuit priming volume a much greater concern in neonatal and infant CPB than in adults?
- Priming volume can exceed the patient's total blood volume, causing severe hemodilution unless circuit size is minimized
- What strategy do perfusionists use to reduce the impact of priming volume in small pediatric patients?
- Using miniaturized, low-prime circuit components (smaller tubing diameter, smaller oxygenators, shorter tubing length)
- What blood product is commonly added to the prime for neonatal and infant cases to avoid excessive hemodilution anemia?
- Packed red blood cells
- What is deep hypothermic circulatory arrest (DHCA) used for in congenital heart surgery?
- Providing a bloodless, motionless surgical field for repairs (such as aortic arch reconstruction) where cannulation or cross-clamping is not feasible
- What core temperature is typically targeted before initiating DHCA?
- Approximately 18 to 20 degrees Celsius
- What is the main risk associated with prolonged DHCA duration?
- Neurologic injury from cerebral ischemia, with risk increasing as arrest time lengthens
- What technique provides continuous cerebral perfusion during aortic arch surgery as an alternative or adjunct to straight DHCA?
- Selective antegrade cerebral perfusion (regional cerebral perfusion)
- How is selective antegrade cerebral perfusion typically delivered?
- Through a cannula in the innominate (brachiocephalic) artery or directly into the arch vessels at reduced flow during arrest
- Why is pH-stat blood gas management often preferred during pediatric DHCA cooling?
- It increases cerebral blood flow during cooling, which may promote more uniform brain cooling before arrest
- What congenital condition involves a single functional ventricle and often requires a single-ventricle palliation pathway of staged surgeries?
- Hypoplastic left heart syndrome (and other single-ventricle anomalies)
- What is the general goal of the Norwood procedure in single-ventricle palliation?
- Establishing unobstructed systemic (aortic) outflow from the single ventricle and a reliable source of pulmonary blood flow, usually with a shunt
- What is the Glenn procedure in staged single-ventricle palliation?
- A cavopulmonary connection routing superior vena cava flow directly to the pulmonary arteries, typically done in early infancy
- What is the Fontan procedure?
- The final staged palliation that routes inferior vena cava flow to the pulmonary arteries, completing a total cavopulmonary connection for single-ventricle physiology
- Why does bypass for cyanotic congenital heart disease sometimes require special attention to shunt or collateral vessel flow?
- Unligated shunts or aortopulmonary collaterals can steal flow from the systemic circuit, complicating flow management and cooling
- What is a common consequence of chronic cyanosis on baseline hematocrit in congenital heart disease patients before surgery?
- Compensatory polycythemia (elevated baseline hematocrit) from chronic hypoxemia
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