Heart surgery in young children involves some risks. This study looks at a new type of monitor that may reduce these risks. Near Infrared Reflectance Spectroscopy (NIRS) aims to measure if enough blood reaches vital organs in the body. The investigators goal is to see if this shows problems developing sooner than usual. The investigators do not know at this time if they can improve the blood supply to the vital organs. The investigators main aim is to see which responses work the best. The NIRS monitor is approved by the U.S. Food and Drug Administration (FDA). The investigators will also follow the progress of recovery after surgery in the Cardiac Intensive Care Unit (CICU). This will find out if using the NIRS monitor improves the outcome for children.
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Cumulative time that NIRS is below threshold (from continuous electronic recording of NIRS data)
Timeframe: participants will be followed for the duration of surgery and during the first 24 hours postop in the CICU, an expected average of 35 hours.