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

NORCET 6 Prelims -2024

Medical Surgical Nursing

Medium

Appeared in: NORCET 6 Prelims -2024

Explanation

The primary goal in acute asthma is to correct hypoxemia and maintain oxygen saturation (SpO₂) within the target range of 94-98%.
For a patient with moderate symptoms (conscious, speaking, wheezing), initial therapy should start with a low flow rate and be titrated upwards based on response.
A flow rate of 2 L/min via nasal cannula is a safe and standard starting point to achieve the target saturation without the risks of over-oxygenation.
This approach allows for continuous assessment and adjustment of oxygen therapy as the patient's condition changes.

Option B: A flow rate of 5 L/min is typically used for moderate distress or if lower flows are insufficient. While it may be required, starting at a lower rate of 2 L/min and titrating is a more cautious and standard initial approach.
Option C: A flow rate of 10 L/min is considered high-flow oxygen. It is not the appropriate initial rate for a patient who is hemodynamically stable and able to speak, as it may provide excessive oxygen.
Option D: A flow rate of 15 L/min is the maximum setting for a non-rebreather mask and is reserved for patients with severe, life-threatening asthma attacks or profound hypoxemia.

Visual 1: Diagram: Comparison of oxygen delivery devices (Nasal Cannula, Simple Face Mask, Non-Rebreather Mask), showing their typical flow rates and uses.
Visual 2: Flowchart: Decision-making for oxygen therapy in acute asthma, from initial assessment to escalation of care based on SpO₂ and clinical signs.

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 considered a medication and must be administered with a clear target saturation in mind, typically 94-98% in asthma, to avoid complications of both hypoxia and hyperoxia.
Nurses must continuously monitor the patient's respiratory status, including SpO₂, respiratory rate, work of breathing, and mental status, to titrate oxygen appropriately and recognize signs of deterioration.
What if? If the patient's SpO₂ was 89% and they were only able to speak in single words, the correct initial action would be to apply a high-flow non-rebreather mask at 15 L/min and call for immediate medical assistance, as this indicates a severe exacerbation.

How to Approach the Question

First, identify the patient's condition from the stem: an acute asthma exacerbation.
Next, assess the severity based on the clinical signs provided. The patient is wheezing and has chest pain but is conscious and verbal, which suggests a moderate, not severe, attack.
Recall the goal of oxygen therapy in asthma: to correct hypoxemia and maintain SpO₂ in the target range (94-98%) while avoiding excessive oxygen.
Apply the principle of 'start low, go slow' for initial management in a stable patient. A low flow rate is the safest first step.
Evaluate the options. 2 L/min is a low flow rate appropriate for initial therapy. 5 L/min is a moderate flow, and 10-15 L/min are high flow rates reserved for severe attacks. Therefore, 2 L/min is the most appropriate initial choice.

Concept Tested & Keywords

Concept Tested: Initial Oxygen Therapy in Acute Asthma Exacerbation
Stem keywords: asthma, emergency, wheezing, chest pain, flow rate, Oxygen
Lead-in keywords: What should be
Clinical cues: Patient is verbalizing complaints, which indicates a patent airway and moderate, not severe, distress.

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