What is the appropriate oxygen flow rate for a Venturi mask?

The appropriate oxygen flow rate for a Venturi mask is typically in the range of 6-12 L/min. This flow rate is essential for ensuring that the mask delivers a precise concentration of oxygen, utilizing the Venturi effect. The mask itself is designed with color-coded jets that mix a specific amount of ambient air with oxygen, allowing for accurate dosages of oxygen delivery, which can be particularly crucial for patients with chronic obstructive pulmonary disease (COPD) or those requiring controlled oxygen therapy.

The other options do not reflect the optimal functionality of the Venturi mask. Lower flows, such as those specified in the first choice, would not provide sufficient oxygen concentration for therapeutic needs. Conversely, the flow corresponding to choice C, which is fixed at 15 L/min, is above the level typically used for a Venturi mask and can lead to higher than intended oxygen concentrations, potentially causing harm to patients with certain respiratory conditions. Lastly, choice D lists oxygen concentrations rather than flow rates, which does not accurately address the question regarding the appropriate flow setting for effective treatment with a Venturi mask.