Which oxygen delivery method is NOT appropriate for volumes of 8-10 L/min?

The nasal cannula is typically used for oxygen delivery at flow rates ranging from 1 to 6 liters per minute, which allows for a comfortable and non-invasive means of providing supplemental oxygen to patients. When administered at this flow range, the nasal cannula can deliver a concentration of oxygen that is appropriate for patients who require mild to moderate oxygen supplementation.

Conversely, using a nasal cannula at volumes of 8-10 L/min is generally not appropriate due to the potential for drying of the nasal mucosa and discomfort for the patient, as well as the risk of increasing the inspired oxygen concentration beyond safe levels. Higher flow rates with a nasal cannula can also lead to aspiration risks as the tubing may not adequately capture all the exhaled air. This delivery method is thus limited to lower flow rates to prevent complications and ensure patient comfort.

In contrast, other methods such as simple face masks, face masks with reservoirs, and bag-valve masks are designed to handle higher flow rates and efficiently deliver oxygen at the volumes specified in the question. These devices are suitable for situations requiring higher oxygen concentrations or when rapid delivery of oxygen is necessary.