High-frequency oscillatory ventilation (HFOV) is a lung-protective method of mechanical ventilation that utilizes nonconventional gas exchange mechanisms to provide lung ventilation at very low tidal volumes and high frequencies. It can minimize ventilator-induced lung injury risk while maintaining high end-expiratory lung volume. HFOV serves as an alternative to conventional mechanical ventilation and functions as a rescue strategy when standard approaches fail. The technique is used across patient populations but most commonly treats acute respiratory distress syndrome (ARDS) patients, those at risk for ventilator-induced lung injury, and neonates with respiratory failure.
High-frequency oscillatory ventilation has been associated with improved clinical outcomes when compared to conventional mechanical ventilation for patients with ARDS. ARDS involves acute lung inflammation that reduces oxygenation capacity, typically requiring artificial respiration. HFOV opens collapsed lung tissue through constant positive airway pressure and reduces mechanical stress per breath.
Ventilator-induced lung injury results from volutrauma and atelectotrauma mechanisms. The condition involves mechanical force application to the pulmonary epithelium, triggering inflammation that can spread systemically and cause multisystem organ failure. HFOV prevents this by maintaining alveolar inflation at a constant airway pressure while preventing the "inflate-deflate" cycle.
Over the past two decades, HFOV became established for treating neonates with respiratory failure. Premature infants experience hypoxia, oxygen toxicity, and barotrauma due to immature lungs. Clinical trials demonstrated that neonatal HFOV patients were successfully extubated at an earlier age and were more likely to be alive and independently breathing by 36 weeks.
Physicians should note that HFOV is contraindicated in intracranial hypertension and severe airflow limitation cases. The technique proves less effective in conditions with increased airway resistance, potentially causing air trapping and hyperinflation leading to barotrauma. Close cardiovascular monitoring is necessary due to risks of decreased venous return, reduced cardiac output, intraventricular hemorrhage, and increased intrathoracic pressure. Sepsis monitoring is also important given infection risks from intubation.