Principles of Oxygen Therapy

Oxygen therapy increases the fraction of inspired oxygen to correct hypoxemia and to support tissue oxygen delivery and it must be prescribed with clear targets and monitoring to avoid harm. Indications include hypoxemia due to respiratory failure acute cardiac events and perioperative needs and goals focus on achieving adequate arterial oxygen saturation while minimizing oxygen toxicity. Delivery devices range from low flow nasal cannula and simple masks to high flow systems and non invasive interfaces and each device alters the effective inspired oxygen fraction and the degree of flow support. Clinicians balance device selection with patient comfort mobility and the need for precise oxygen titration and they monitor response using pulse oximetry arterial blood gases and clinical assessment.

Device Selection and High Flow Systems

Device selection depends on the required oxygen fraction flow needs and on the clinical context and high flow nasal oxygen systems provide warmed humidified gas at high flow rates that can improve oxygenation reduce work of breathing and support secretion clearance. High flow systems deliver a more stable inspired oxygen fraction and generate a modest positive airway pressure effect that can improve alveolar recruitment in selected patients. Non invasive ventilation provides both oxygenation and ventilatory support for hypercapnic or hypoxemic respiratory failure and requires careful patient selection monitoring and interface management. Transitioning between devices requires assessment of gas exchange work of breathing and patient tolerance and clear protocols support safe escalation and de escalation of support.

Monitoring Oxygen Therapy and Safety

Monitoring oxygen therapy includes continuous pulse oximetry periodic arterial blood gas analysis and assessment of respiratory rate work of breathing and mental status and targets are individualized for conditions such as chronic hypercapnic respiratory failure where lower saturation targets may be appropriate. Prolonged high inspired oxygen fractions can cause absorption atelectasis and oxygen toxicity and clinicians minimize exposure by titrating to the lowest effective concentration. Equipment safety includes secure tubing connections avoidance of open flames and careful handling of compressed gas cylinders and oxygen concentrators. Education for patients and staff about safe oxygen use and about signs of deterioration supports effective therapy and reduces adverse events.