title: Inhaled nitric oxide therapy increases blood nitrite, nitrate, and s-nitrosohemoglobin concentrations in infants with pulmonary hypertension.
abstract: OBJECTIVE
  To measure the circulating concentrations of nitric oxide (NO) adducts with NO bioactivity after inhaled NO (iNO) therapy in infants with pulmonary hypertension.
  
  
  METHODS
  In this single center study, 5 sequential blood samples were collected from infants with pulmonary hypertension before, during, and after therapy with iNO (n = 17). Samples were collected from a control group of hospitalized infants without pulmonary hypertension (n = 16) and from healthy adults for comparison (n = 12).
  
  
  RESULTS
  After beginning iNO (20 ppm) whole blood nitrite levels increased approximately two-fold within 2 hours (P<.01). Whole blood nitrate levels increased to 4-fold higher than baseline during treatment with 20 ppm iNO (P<.01). S-nitrosohemoglobin increased measurably after beginning iNO (P<.01), whereas iron nitrosyl hemoglobin and total hemoglobin-bound NO-species compounds did not change.
  
  
  CONCLUSIONS
  Treatment of pulmonary hypertensive infants with iNO results in increases in levels of nitrite, nitrate, and S-nitrosohemoglobin in circulating blood. We speculate that these compounds may be carriers of NO bioactivity throughout the body and account for peripheral effects of iNO in the brain, heart, and other organs.
authors: Department of Pediatrics, Division of Neonatology, School of Medicine, Loma Linda University, Loma Linda, CA, USA.
authors: Yomna I
authors: YI
authors: Ibrahim
authors: Janet R
authors: JR
authors: Ninnis
authors: Andrew O
authors: AO
authors: Hopper
authors: Douglas D
authors: DD
authors: Deming
authors: Amy X
authors: AX
authors: Zhang
authors: Jason L
authors: JL
authors: Herring
authors: Lawrence C
authors: LC
authors: Sowers
authors: Timothy J
authors: TJ
authors: McMahon
authors: Gordon G
authors: GG
authors: Power
authors: Arlin B
authors: AB
authors: Blood
mesh_terms: D000280:Administration, Inhalation; D000328:Adult; D005260:Female; D006454:Hemoglobins / Q000378:metabolism*; D006801:Humans; D006976:Hypertension, Pulmonary / Q000097:blood / Q000188:drug therapy*; D007223:Infant; D007231:Infant, Newborn; D008297:Male; D009566:Nitrates / Q000097:blood*; D009569:Nitric Oxide / Q000008:administration & dosage / Q000494:pharmacology*; D009573:Nitrites / Q000097:blood*; D016896:Treatment Outcome; D014665:Vasodilator Agents / Q000008:administration & dosage / Q000494:pharmacology*
chemical_list: D006454:Hemoglobins; D009566:Nitrates; D009573:Nitrites; C103574:S-nitrosohemoglobin; D014665:Vasodilator Agents; D009569:Nitric Oxide