NORCET 6 Prelims -2024
Medical & Surgical Nursing
Easy
Identify the FiO2 rate in given venturi mask:
Appeared in: NORCET 6 Prelims -2024
Explanation
- The device shown is a Venturi mask, which uses color-coded adapters to deliver a precise Fraction of Inspired Oxygen (FiO2).
- The adapter in the image is red.
- According to the standard color-coding system for Venturi masks, a red adapter delivers an FiO2 of 40%.
- To achieve this 40% FiO2, the oxygen flow meter must be set to a rate of 10-12 liters per minute.
Why Other Options Were Wrong
- Option B: An FiO2 of 31% is incorrect. This concentration is delivered by an orange-colored Venturi mask adapter.
- Option C: An FiO2 of 60% is incorrect. This is the highest concentration delivered by a standard Venturi mask and corresponds to a green-colored adapter.
- Option D: An FiO2 of 28% is incorrect. This concentration is delivered by a white-colored Venturi mask adapter.
Related Visual
- Visual 1: Chart - A color-coded chart displaying all the Venturi mask adapters (Blue, White, Orange, Yellow, Red, Green) next to their corresponding FiO2 percentages and required oxygen flow rates. This provides a quick reference for memorization.
- Visual 2: Diagram - An illustration showing how a Venturi mask works, highlighting the entrainment port where room air is drawn in and mixed with the oxygen flow, explaining the Venturi effect.
Clinical Relevance
- Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Identification of FiO2 delivery based on the color-coding of Venturi masks as background academic context rather than a clinical decision trigger.
- Venturi masks are critical for patients with COPD or other conditions requiring a precise, non-variable oxygen concentration to avoid suppressing the hypoxic drive.
- It is a crucial nursing responsibility to ensure that the oxygen flow rate from the wall outlet or tank is set to the minimum specified for the color-coded adapter in use. Using a flow rate lower than recommended will result in an inaccurate FiO2 delivery and potential rebreathing of carbon dioxide.
- What if? If a nurse uses the red (40%) adapter but sets the flow meter to only 5 L/min (instead of the required 10-12 L/min), the patient will not receive 40% FiO2. The delivered oxygen concentration will be lower and unpredictable, and the low flow will not be sufficient to flush CO2 from the mask, leading to hypercapnia.
How to Approach the Question
- First, identify the medical device shown in the image. It is an oxygen mask with a colored attachment, which is characteristic of a Venturi mask.
- Next, specifically identify the color of the entrainment device or adapter. In this case, it is clearly red.
- Recall the standardized color-coding system for Venturi masks, which links each color to a specific FiO2 percentage.
- Match the identified color (red) to its corresponding FiO2 value (40%).
- Select the option that matches this value.
Concept Tested & Keywords
- Concept Tested: Identification of FiO2 delivery based on the color-coding of Venturi masks.
- Stem keywords: Venturi mask, FiO2 rate, oxygen therapy
- Lead-in keywords: Identify
- Clinical cues: The image shows a Venturi mask with a red-colored entrainment device.
Question ID
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