Cánula nasal de alto flujo en pacientes críticos: una revisión narrativa

High-flow nasal cannula has become one of the main strategies for non-invasive ventilatory support in hypoxemic acute respiratory failure, mainly after the COVID-19 pandemic. However, its use extends beyond this scenario and covers different clinical conditions such as the post-extubation period, post-surgical period, hypercapnic respiratory failure and life support in immunosuppressed, trasplant or cancer patients. Manuscripts that support its application have been widely disseminated and the degree of evidence is high enough to recommend its use. Therefore, it is necessary to highlight its physiological effects such as comfort, precise fraction of inspiratory oxygen, CO2 lavage or optimize end-expiratory lung volume to understand its mechanism of action and improve patients' outcomes. The objective of this narrative review is to offer a brief and concise summary of the benefits of applying this therapy in different clinical scenarios without the rigid structure of a systematic review. Based on these lines, the curious reader can expand the scientific evidence that supports the use of the high-flow nasal cannula in each particular scenario.