What is Known:
• Perfusion index is an indirect measure of perfusion which depends on cardiac output and peripheral vascular resistance whose normal values have been documented in term and preterm infants in the first days of life.
• Perfusion index has been proposed for the screening of congenital heart disease with duct-dependent systemic circulation in term infants.
What is New:
• Perfusion index shows a significant correlation with the left ventricular output in term infants at the moment of the screening for congenital heart disease.
• Perfusion index might have a theoretical role in improving the accuracy of pulse oximetry in the screening of CHD associated to low systemic flow.