HFNC vs NIPPV Following Extubation

This study aims to answer an important clinical question that all providers struggle with: how to optimize respiratory support following extubation in Infants After Cardiac Surgery (CS) for Congenital Heart Disease (CHD). The high morbidity and at times mortality associated with failed extubation events demonstrates this clearly, as extubation failure (EF) is stressful to this fragile population and results in hemodynamic compromise as well as airway trauma due to manipulation of the airway.

This study aims to: 1) comparatively examine which mode of respiratory support (HFNC vs NIPPV) after extubation is more effective at lowering rates of EF, and 2) examine clinical risk factors, outside of the respiratory support model (HFNC vs. NIPPV), that are associated with EF in patients with CHD after CS.

These infants often remain endotracheally intubated on mechanical ventilatory support upon return to the Cardiac Intensive Care Unit (CICU). These patients undergo a trial of extubation at the discretion of the CICU team when deemed safe. Studies have shown that approximately 3-27% of patients with CHD fail extubation after cardiac surgery. Risk factors for extubation failure (EF) are complex surgical repair, younger age, smaller patients, presence of airway anomalies, genetic abnormalities, pulmonary hypertension, use of cardiopulmonary bypass (CPB), hypothermia, atelectasis, lung injury, phrenic and diaphragmatic nerve injury, and prolonged open sternotomy. Patients with CHD who are successfully extubated using NIPPV have been shown to have shorter lengths of stay, while studies in pre-term infants without CHD showed NIPPV reduced EF compared to hood/tent oxygen, or HFNC. Other studies have shown HFNC to decrease the need for intubation in infants with respiratory failure and may improve respiratory mechanics through unidirectional flow in the upper airway, decreasing dead space, improving minute ventilation, pulmonary compliance, and distending airway pressure. This support ultimately reduces the work of breathing and oxygen consumption, while enhancing oxygen delivery.

Despite the use of HFNC and NIPPV to support patients following extubation, there is limited data on the comparative effectiveness of HFNC versus NIPPV to prevent EF in infants with CHD after CS. The investigators hypothesize that the use of HFNC will be associated with lower rates of EF, and a shorter length of stay when compared to NIPPV.