In venturi mask maximum 02 concentration attained is :
**Core Concept**
The Venturi mask is a medical device used to deliver a precise concentration of oxygen to a patient. It works on the principle of jet ventilation, where a high-velocity gas flow creates a pressure gradient that draws in room air, mixing it with oxygen to achieve the desired concentration.
**Why the Correct Answer is Right**
The Venturi mask has a specific design that allows it to deliver a maximum oxygen concentration of 60-70%. This is achieved by using a Venturi valve that creates a high-velocity gas flow, which then mixes with room air to produce the desired oxygen concentration. The exact concentration depends on the size of the Venturi jet and the flow rate of oxygen.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because the Venturi mask is designed to deliver a specific concentration of oxygen, which is not variable.
**Option B:** This option is incorrect because the maximum oxygen concentration that can be achieved with a Venturi mask is not 100%.
**Option C:** This option is incorrect because the concentration of oxygen delivered by a Venturi mask is not dependent on the patient's respiratory rate.
**Clinical Pearl / High-Yield Fact**
It's essential to remember that the Venturi mask is not suitable for patients who require high concentrations of oxygen (>60-70%) or have a respiratory rate greater than 30 breaths per minute.
**Correct Answer: B. 60-70%.**