While providing postoperative care to a lung resection patient, which should the nurse assess because the vag… - UP NHM CHO 7 Sept 2022 (Shift-2)

UP NHM CHO 7 Sept 2022 (Shift-2)

Medical & Surgical Nursing

Medium

Appeared in: UP NHM CHO 7 Sept 2022 (Shift-2)

Explanation

During a lung resection, the vagus nerve is at risk for irritation due to its location in the chest cavity.
The vagus nerve is the main nerve of the parasympathetic nervous system, which has a calming effect on the body.
Irritation of the vagus nerve triggers the release of acetylcholine, a neurotransmitter that acts on the heart's sinoatrial (SA) node.
This action directly slows down the heart's pacemaker, resulting in a decreased heart rate (bradycardia).
Therefore, assessing the heart rate is the most direct and primary method to monitor for vagal nerve irritation.

Option A: Atrial dysrhythmias, particularly atrial fibrillation, are common after thoracic surgery but are typically caused by a combination of factors like inflammation, surgical stress, and fluid shifts, rather than being a direct, isolated effect of vagal irritation.
Option C: Hypotension is a secondary consequence, not a primary sign. It would only occur if the heart rate drops so significantly (severe bradycardia) that it causes a decrease in cardiac output.
Option D: Dyspnoea is a respiratory symptom. Following a lung resection, it is most commonly related to pain, atelectasis, pleural effusion, or pneumothorax, not the cardiac effects of vagal nerve stimulation.

Clinical Relevance

Nursing practice connection: Use the key finding related to Postoperative complications of thoracic surgery and autonomic nervous system responses to guide bedside assessment, documentation, and the next nursing action.
Nurses must perform continuous or frequent cardiac monitoring (heart rate and rhythm) for patients after thoracic surgery to promptly detect bradycardia or other arrhythmias.
A sudden, unexplained drop in heart rate in a post-thoracic surgery patient should immediately raise suspicion of vagal stimulation.
What if? - If the patient developed tachycardia (a fast heart rate) instead, the nurse should suspect other common postoperative causes like pain, anxiety, hypovolemia (fluid loss), or infection, as this is the opposite of a vagal response.

How to Approach the Question

First, identify the key elements in the question: the procedure (lung resection), the specific physiological event (vagus nerve irritation), and the required nursing action (assess).
Recall the function of the vagus nerve. It is the primary nerve of the parasympathetic nervous system, which slows down heart rate.
Connect the event (irritation) to its physiological effect. Irritating the vagus nerve stimulates it, leading to an exaggerated parasympathetic response.
Determine the most direct outcome of this response on the heart, which is a decrease in heart rate (bradycardia).
Select the assessment parameter that directly measures this effect, which is 'Heart rate'.
Rule out the other options by identifying them as secondary effects (Hypotension), related to different causes (Atrial dysrhythmia), or related to a different body system (Dyspnoea).

Concept Tested & Keywords

Concept Tested: Postoperative complications of thoracic surgery and autonomic nervous system responses.
Stem keywords: postoperative care, lung resection, vagus nerve, irritated, assess
Lead-in keywords: assess
Clinical cues: The procedure (lung resection) provides the context for potential vagus nerve irritation due to its anatomical location in the thorax.