Congenital heart disease (other than patent ductus arteriosus (PDA), patent foramen ovale (PFO), and restrictive ventricular septal defect (VSD)

Known or suspected airway anomalies

Severe congenital malformations

Need to remain intubated for other reasons (i.e. having surgery)

Has met SBT criteria on previous calendar day (after 48 hrs of ventilation, PIP≤18, PEEP≤6, FiO2≤40%, Rate≤30, PS≤8)

Extubation Readiness Study in Very Low Birthweight Infants