Table 1.

Candidate Predictor Variables for CART Model

Norwood Procedure Hospitalization
Patient Characteristic	Preoperative	Operative	Postoperative to Discharge
Gender	Prenatal diagnosis	Assigned treatment	ECMO
Ethnicity	Fetal intervention	Shunt at end of operation	CPR
HLHS	Age at diagnosis	Cross clamp time	Open sternum
Aortic atresia	Birth weight	Total support time, min	ICU days
Genetic or other anomaly	Gestational age	Perfusion type	# surgeries
	APGAR scores	DHCA time	# complications
	Highest lactate	RCP time	# medications at discharge
	Mechanical ventilation	Hematocrit	Oxygen saturation
	Catheter interventions	Lowest temperature during CPB
		Ultrafiltration
		Aprotinin
		Steroids
		α-blockade
		ECMO*

CPB-cardiopulmonary bypass, CPR- cardiopulmonary resuscitation, DHCA- deep hypothermic circulatory arrest, ECMO-extracorporeal membrane oxygenation, HLHS-hypoplastic left heart syndrome, ICU-intensive care unit, RCP-regional cerebral perfusion

^*initiated in the operating room