NORCET 6 Prelims -2024: An asthma patient comes to emergency with complaints of wheezing and chest pain. What should be the flow rate…

NORCET 6 Prelims -2024

Medical & Surgical Nursing

Medium

Appeared in: NORCET 6 Prelims -2024

Explanation

For a conscious patient with an acute asthma exacerbation without signs of severe respiratory distress, the standard practice is to initiate oxygen at a low flow rate.
A flow rate of 2 L/min via nasal cannula is a safe starting point, delivering an FiO2 of approximately 28%.
This approach allows the nurse to titrate the oxygen flow upwards based on continuous pulse oximetry monitoring to achieve the target SpO2 of 94-98%.
It avoids the potential risks of administering unnecessarily high concentrations of oxygen before a full assessment is complete.

Option B: A flow rate of 5 L/min is appropriate for moderate distress, but it is not the most cautious initial step. If a simple face mask is used, 5 L/min is the minimum required flow to prevent rebreathing of carbon dioxide, but a nasal cannula at 2 L/min is a safer starting point for titration.
Option C: A flow rate of 10 L/min is considered high-flow oxygen, typically delivered via a non-rebreather mask. This is indicated for patients in severe respiratory distress or with significant hypoxemia.
Option D: A flow rate of 15 L/min provides the highest concentration of oxygen via a non-rebreather mask. It is reserved for life-threatening emergencies, such as a patient with a silent chest, cyanosis, confusion, or profound hypoxia.

Clinical Relevance

Nursing practice connection: Prioritize focused assessment, early escalation, and real-time monitoring when managing Initial oxygen therapy in acute asthma exacerbation in acute care settings.
Oxygen is a prescribed medication. Nurses must administer it according to protocols and titrate it based on the patient's response, primarily monitored through pulse oximetry (SpO2).
The key nursing intervention is continuous assessment. Monitor respiratory rate, work of breathing, mental status, and SpO2 to ensure the patient is responding to treatment and to identify any deterioration quickly.
What if? If the same patient suddenly became confused, started using accessory muscles to breathe, and their SpO2 dropped to 88%, the nurse's priority would change. The correct action would be to immediately switch to a non-rebreather mask at 15 L/min and call for urgent medical assistance (e.g., a rapid response team).

How to Approach the Question

First, identify the patient's condition (acute asthma exacerbation) and the clinical setting (emergency department).
Analyze the provided symptoms: 'wheezing' and 'chest pain'. Note that the patient is conscious and able to complain.
Critically, assess what information is missing. The question does not mention signs of severe distress (e.g., altered mental status, cyanosis, inability to speak, SpO2 value).
Recall the principle of oxygen therapy for asthma: titrate to a target SpO2 of 94-98%.
Evaluate the options based on severity. High flow rates (10-15 L/min) are for severe cases. Low flow rates (2 L/min) are for mild-to-moderate cases.
In the absence of information indicating severe distress, select the safest and most conservative initial action, which is to start with low-flow oxygen and titrate up as needed.

Concept Tested & Keywords

Concept Tested: Initial oxygen therapy in acute asthma exacerbation.
Stem keywords: asthma, emergency, wheezing, chest pain, oxygen, flow rate
Lead-in keywords: What should be
Clinical cues: Patient presenting to emergency suggests an acute condition requiring prompt assessment and intervention.
Clinical cues: Symptoms of wheezing and chest pain confirm an asthma exacerbation.

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E6 Nursing Fundamentals Taylor p. 731-733

E6 Ghai Essential Pediatrics(pp 26-904 of 913) p. 415-417