Prevention of Transfusion Related Acute Gut Injury (TRAGI) in Extremely Low Gestational Age Neonates (ELGANs) Using iNO

Selection criteria: 1) Neonates 24 0/7 to 27 6/7 weeks gestational age (GA) 2) More than 2 weeks postnatal age. 3) Anemia with Hct less than 28 % 4) \>50 % total daily fluids is enteral 5) History of at least 1 prior PRBC transfusion ELGANs admitted to the neonatal intensive care unit (NICU) will be screened for the study. If patients meet the selection criteria, parents will be approached to obtain informed consent. Then the patient will be randomized to either iNO or placebo group before treatment. The treating physician will make the decision regarding timing of the PRBC transfusion to treat anemia for the subject. During the period of observation, near infrared spectroscopy (NIRS) monitoring will be performed on all enrolled subjects during which a non-invasive probe will be attached to the skin at 3 sites simultaneously- on abdomen below umbilicus, flank/back, and forehead for calculation of fractional tissue oxygen extraction ( FTOE) in conjunction with concurrent pulse oximetry recordings. Conventional vital signs, blood gas, lactate, haptoglobin and cytokines will be measured before and after the PRBC transfusion