['Pulmonary hypertension (PH) is the most important complication of congenital diaphragmatic hernia (CDH) and still has a high mortality rate. The aim of this study was to evaluate the effectiveness of inhaled nitric oxide therapy in PH due to CDH.', 'Hospital records of children who had undergone inhaled nitric oxide therapy for PH due to CDH between June 2009 and December 2011 were reviewed.', 'Twenty-nine patients had a diagnosis of CDH at the time of study, and eight of these patients underwent nitric oxide therapy because of failure of conventional ventilation techniques, which was successful in five of these patients. Patients who had a good overall outcome of nitric oxide therapy experienced rapid improvement (pretreatment, mean PaO2\xa0=\xa044.8\xa0mmHg; after the first hour of therapy, mean PaO2\xa0=\xa096.8\xa0mmHg), whereas patients with no response did not have a similar course (pretreatment, PaO2\xa0=\xa037\xa0mmHg; after the first hour, PaO2\xa0=\xa054.6\xa0mmHg).'] Does initial oxygenation response to inhaled nitric oxide predict improved outcome in congenital diaphragmatic hernia?