Effect of High-Flow Nasal Cannula Oxygen Therapy on Pediatric Patients With Congenital Heart Disease in Procedural Sedation: A Prospective, Randomized Trial

The study was conducted to compare the outcome of high-flow nasal cannula (HFNC) oxygen therapy with conventional oxygen therapy through a simple oxygen mask for pediatric patients with congenital heart disease during percutaneous intervention while under procedural sedation.Prospective, randomized and controlled trial.A Cantonese cardiac center in China.Two hundred American Society of Anesthesiologists classification II pediatric patients were enrolled from April 25, 2018 to November 28, 2018.Patients scheduled for percutaneous closure of a heart defect under deep sedation with propofol, midazolam and fentanyl by an anesthesiologist were randomized (1:1) to receive oxygen therapy through a simple oxygen mask or through the HFNC system.The primary outcome was the lowest oxygen saturation (SpO2). Secondary outcomes included the incidence of hypoxia (SpO2 < 90%), requirement for noninvasive respiratory support, change in the gastric antrum area and other adverse events. Blood gas analysis results also were compared. Oxygen therapy through the HFNC system improved the lowest SpO2 (99% [94%-100%]), as compared with the mask group (99% [72%-100%]), p < 0.001. Seven patients out of 99 (7.1%) in the mask group had hypoxia or required bag-mask ventilation, whereas no such patient was reported in the HFNC group, p < 0.001. There were no differences between the groups in terms of gastric distention, procedure length, total propofol dose, atropine use or other complications.When compared with simple mask oxygenation, HFNC could reduce the incidence of desaturation, the need for airway assisted ventilation and risk of carbon dioxide retention without causing hemodynamic instability or gastric distention. It is effective for pediatric patients with non-cyanotic congenital heart disease who require procedural sedation.