NORCET 6 Prelims -2024: What flow rate should be set when using resuscitation bag?

NORCET 6 Prelims -2024

Medical & Surgical Nursing

Easy

Appeared in: NORCET 6 Prelims -2024

Explanation

The standard oxygen flow rate for an adult resuscitation bag (Bag-Valve-Mask or BVM) is 15 L/min.
This high flow rate is essential to keep the reservoir bag fully inflated, which allows for the delivery of a high concentration of oxygen (FiO2 of 90% to 100%).
A lower flow rate would risk the reservoir bag collapsing, especially during rapid ventilations, leading to the patient inhaling room air and receiving a lower oxygen concentration.
This practice is aligned with guidelines for devices like nonrebreather masks, which also require a 10-15 L/min flow to ensure high FiO2 and prevent reservoir collapse.

Option A: While 10 L/min is a high flow rate, it may be insufficient to keep the reservoir bag of a BVM fully inflated during the rapid ventilations required in resuscitation, thus reducing the delivered oxygen concentration.
Option B: A flow rate of 9 L/min is too low for a BVM used in resuscitation. It would not keep the reservoir bag inflated, leading to the patient entraining significant amounts of room air.
Option D: A flow rate of 8 L/min is inadequate for a BVM and would result in a collapsed reservoir and delivery of low-concentration oxygen.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Oxygen flow rate for Bag-Valve-Mask (BVM) resuscitation as background academic context rather than a clinical decision trigger.
During a cardiac or respiratory arrest, ensuring the highest possible oxygen delivery is a critical nursing priority. Setting the flow rate to 15 L/min is a key first step in managing the airway and breathing.
Nurses must visually confirm that the reservoir bag remains inflated. A collapsing bag is a critical sign of a problem, such as inadequate flow, a leak in the system, or a poor mask seal, which requires immediate correction.
What if? If the patient were a neonate, a much smaller resuscitation bag (e.g., 240 mL) and a lower flow rate (e.g., 5-10 L/min, per institutional protocol) would be used to prevent barotrauma (lung injury from excessive pressure).

How to Approach the Question

Identify the core of the question: it asks for the correct flow rate for a specific piece of emergency equipment (resuscitation bag).
Recall the primary purpose of a resuscitation bag: to deliver the highest possible concentration of oxygen during an emergency (resuscitation).
Connect the principle: high-concentration oxygen delivery requires a high flow rate to fill a reservoir and prevent dilution with room air.
Evaluate the options. 15 L/min is the highest rate listed and aligns with the principle of maximizing oxygen delivery in an emergency. The lower rates are more typical for non-emergency oxygen therapy devices.

Concept Tested & Keywords

QvBDY1Nrpiv6CSIhUpzzqi

E6 Nursing Fundamentals Potter Perry 12e Part 5 p. 7-9

E6 Nursing Fundamentals Taylor p. 731-733