Which non-invasive device involves two levels of pressure for breathing support?

The non-invasive device that involves two levels of pressure for breathing support is the BiPAP (Bilevel Positive Airway Pressure) machine. This device is specifically designed to assist patients with respiratory issues by providing two distinct levels of pressure during inhalation and exhalation. The higher pressure is delivered during inhalation to help keep the airways open and support lung function, while a lower pressure is used during exhalation, making it easier for the patient to breathe out and preventing air trapping.

The versatility of BiPAP is significant in critical care settings, as it can benefit patients with conditions such as Chronic Obstructive Pulmonary Disease (COPD), congestive heart failure, or obstructive sleep apnea, who may struggle with normal breathing patterns. The ability to provide different pressures during the respiratory cycle facilitates improved ventilation and oxygenation, enhancing patient comfort and effectiveness of treatment.

In contrast, other devices mentioned in the options do not provide varying levels of pressure. A nasal cannula delivers a constant flow of oxygen, a non-rebreather mask provides a high concentration of oxygen but at a single pressure, and a Venturi mask uses different color-coded adapters to deliver specific concentrations of oxygen but again does not involve varying pressure levels.