At a flow rate of 3L/min, inspiratory (FUO2) concentration of 30–60% can be achieved by using a –
**Core Concept**
The question tests the understanding of the principles of oxygen therapy, specifically the use of a Venturi mask to deliver precise concentrations of oxygen. A Venturi mask is a medical device that uses a specific type of jet mixing system to produce a precise concentration of oxygen by precisely controlling the flow rate of oxygen and room air.
**Why the Correct Answer is Right**
The Venturi mask uses a specific type of flow restrictor to create a precise concentration of oxygen. By adjusting the flow rate of oxygen and room air, the Venturi mask can deliver a wide range of oxygen concentrations. In this case, a flow rate of 3L/min and an inspiratory oxygen concentration (FiO2) of 30-60% can be achieved by using a specific type of Venturi mask. The Venturi mask works by using a flow restrictor to create a precise mixture of oxygen and room air, allowing for a consistent and accurate delivery of oxygen to the patient.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not accurately describe the device that can achieve a FiO2 of 30-60% at a flow rate of 3L/min. While other devices may be able to deliver oxygen, they may not be able to achieve the precise concentration required.
**Option B:** This option is incorrect because it does not accurately describe the device that can achieve a FiO2 of 30-60% at a flow rate of 3L/min. This device may be able to deliver oxygen, but it may not be able to achieve the precise concentration required.
**Option D:** This option is incorrect because it does not accurately describe the device that can achieve a FiO2 of 30-60% at a flow rate of 3L/min. This device may be able to deliver oxygen, but it may not be able to achieve the precise concentration required.
**Clinical Pearl / High-Yield Fact**
A Venturi mask is often used in patients who require precise control of oxygen therapy, such as those with chronic obstructive pulmonary disease (COPD) or other respiratory conditions. The key to using a Venturi mask effectively is to choose the correct flow restrictor and to ensure that the device is properly calibrated.
**Correct Answer: C. Venturi mask.**