Background: High-flow nasal cannula (HFNC) therapy is increasingly used in pediatric ICUs as an intermediate level of support between conventional oxygen delivery and noninvasive ventilation (NIV). The safety of HFNC has seldom been studied, and some cases of barotrauma have been reported. This retrospective study aims to describe HFNC use in a tertiary care pediatric ICU, with a focus on the complications associated with this therapy.
Methods: Between January 2013 and January 2014, all children <18 y old treated with HFNC in the pediatric ICU were included. Demographic data, HFNC settings, chest radiograph reports, and blood gas values were gathered from the electronic medical records. Episodes of pneumothorax, pneumomediastinum, and significant epistaxis were noted. Pneumothorax was distinguished from chest tube-related air leak (frequent after cardiac surgery), which was defined as a small pneumothorax with no clinical impact that resolved spontaneously after chest tube removal.
Results: During the 1-y study period, there were 177 HFNC episodes, involving 145 subjects with a median (interquartile range) age of 8 (2-28) months. HFNC was used as primary support in 31% of episodes, after extubation in 36% and after NIV in 18%. HFNC was administered exclusively for nitric oxide delivery in 16% of episodes. Two children (1%) developed new pneumothoraces that required chest tube insertion, whereas 5 (3%) chest tube-related air leaks were noted. One (0.6%) episode of significant epistaxis was noted. Among 6 preexisting pneumothoraces, none worsened under HFNC. Failure of HFNC occurred in 32 episodes, requiring transition to NIV in 28 cases and endotracheal intubation in 5 cases.
Conclusions: Support with HFNC following a clinical protocol in pediatric ICUs was associated with a relatively low rate of complications. Since HFNC use is increasing, further evidence is needed to confirm its efficacy and safety.
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