Abstract:
OBJECTIVE:To determine the clinical role of inhaled nitric oxide (iNO) in the treatment of persistent pulmonary hypertension of the newborn (PPHN). STUDY DESIGN:Prospective open observational clinical study. SETTING:A regional cardiac and pediatric intensive care unit. METHODS:Twenty-five consecutive near-term neonates (> 35 weeks gestation) with severe PPHN (oxygenation index [OI] > 25) were given a trial of iNO of 20 ppm for 20 minutes. Neonates who showed a greater than 20% improvement in PaO2 as well as a decrease in the OI to below 40 were defined as responders and continued on this therapy. RESULTS:Four patterns of response emerged to the iNO therapy: Pattern 1 neonates (n = 2) did not respond to the initial trial of iNO-one survived. Pattern 2 neonates (n = 9) responded to the initial trial of iNO, but failed to sustain this response over 36 hours, as defined by a rise in the OI to > 40. Six survived, five with extracorporeal membrane oxygenation. Pattern 3 neonates (n = 11) responded to the initial trial of iNO, sustained this response, and were successfully weaned from iNO within 5 days--all survived to discharge. Pattern 4 neonates (n = 3) responded to the initial trial of iNO, but developed a sustained dependence on iNO for 3 to 6 weeks. All three died and lung histology revealed severe pulmonary hypoplasia and dysplasia. These neonates (pattern 4) not only required iNO for a longer period of time than did the sustained responders (pattern 3), but they required significantly higher doses of iNO during their first 5 days of iNO therapy. CONCLUSIONS:Early responses to iNO may not be sustained. Neonates with pulmonary hypoplasia and dysplasia may have a decreased sensitivity and differing time course of response to iNO when compared with patients who have PPHN in fully developed lungs.
journal_name
Pediatricsjournal_title
Pediatricsauthors
Goldman AP,Tasker RC,Haworth SG,Sigston PE,Macrae DJsubject
Has Abstractpub_date
1996-10-01 00:00:00pages
706-13issue
4 Pt 1eissn
0031-4005issn
1098-4275journal_volume
98pub_type
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