Cerebral oxygen saturation before congenital heart surgery

Area of Science:

• Pediatric Cardiology
• Neurocritical Care
• Medical Devices

Background:

• Neurologic abnormalities suggestive of hypoxia-ischemia are common in congenital heart disease (CHD) prior to cardiac surgery.
• Evaluating preoperative cerebral oxygenation is crucial for managing these patients.

Purpose of the Study:

• To determine and compare cerebral oxygen saturation (ScO2) in children with CHD and healthy children before surgical or radiologic procedures.

Main Methods:

• Ninety-one children with CHD and 19 healthy children under 7 years were studied.
• Cerebral oxygen saturation (ScO2) and arterial saturation (SaO2) were measured using near-infrared cerebral oximetry and pulse oximetry, respectively.
• Cerebral oxygen extraction (CEO2) was calculated, and multivariable regression analyzed ScO2 in relation to clinical variables.

Main Results:

• Healthy children and those with ventricular septal defect, aortic coarctation, or post-Fontan single ventricle had similar ScO2 (68%±10%).
• Significantly decreased ScO2 was observed in patients with patent ductus arteriosus, tetralogy of Fallot, hypoplastic left heart syndrome, pulmonary atresia, and single ventricle post-shunt or Glenn operation.
• Only SaO2 was significantly related to ScO2 (R=0.63, p<0.001).

Conclusions:

• Cerebral oxygenation in children with CHD is variable, depending on the specific anatomy and arterial saturation.
• Some CHD patients exhibit critically low cerebral oxygenation levels compared to healthy peers, highlighting the need for targeted monitoring and intervention.