While monitoring a patient of Myocardial Infarction in your Coronary Care Unit you observe an isolated ventricular ectopic on the monitor. You will inform the physician and:

Appeared in: GMCH - 2016

Explanation

An isolated ventricular ectopic beat (VEB), or premature ventricular contraction (PVC), is a common finding after a myocardial infarction due to myocardial irritability.
In a hemodynamically stable patient, an isolated VEB is often benign and does not require immediate intervention beyond notifying the physician.
The standard of care is to continue vigilant cardiac monitoring in the CCU to observe for any change in the frequency or pattern of the arrhythmia, which would then warrant further action.
This approach avoids the risks associated with unnecessary antiarrhythmic drugs or more aggressive interventions.

Option B: Defibrillation is a high-energy electrical shock delivered to the heart to terminate life-threatening, pulseless arrhythmias like ventricular fibrillation (VF) or pulseless ventricular tachycardia (VT). It is not used for an isolated ectopic beat in a patient who has a pulse and is conscious.
Option C: Intravenous Lignocaine (Lidocaine) is an antiarrhythmic drug. Its prophylactic use for simple, isolated ectopics is no longer recommended as it can have proarrhythmic effects and increase mortality. It is reserved for more severe arrhythmias.
Option D: Intravenous Nitroglycerin is a vasodilator used to treat ischemic chest pain (angina) by increasing blood flow to the myocardium and reducing its oxygen demand. It has no direct effect on treating ventricular ectopics.

Clinical Relevance

Nursing practice connection: Prioritize focused assessment, early escalation, and real-time monitoring when managing Management of Post-Myocardial Infarction Arrhythmias in acute care settings.
A nurse's ability to correctly interpret ECG rhythms and differentiate between benign and malignant arrhythmias is a critical skill in cardiac care.
Over-treatment of benign arrhythmias can lead to adverse drug effects and worse patient outcomes. The principle of 'first, do no harm' is paramount.
What if? If the monitor showed frequent ectopics (>6 per minute) or a short run of three or more consecutive ectopics (a 'salvo' of non-sustained VT), the nurse's action would escalate. The correct response would be to urgently notify the physician and prepare to administer an antiarrhythmic like amiodarone or lidocaine, as this indicates increased electrical instability and a higher risk of sustained VT or VF.

How to Approach the Question

First, identify the patient's primary diagnosis and setting: a Myocardial Infarction patient in a Coronary Care Unit. This context implies high risk but also continuous monitoring.
Next, focus on the specific clinical finding: an 'isolated' ventricular ectopic. The word 'isolated' is the most important clue, suggesting a singular, infrequent event.
Evaluate the options based on the principle of escalating care. Match the intervention to the severity of the problem.
Rule out options that are too aggressive for an 'isolated' event (defibrillation, IV Lignocaine) or are for a different problem (IV Nitroglycerin for angina).
Conclude that the most appropriate and safest action for a single, non-threatening event in a monitored setting is to continue observation and document the finding.

Concept Tested & Keywords

Concept Tested: Management of Post-Myocardial Infarction Arrhythmias
Stem keywords: Myocardial Infarction, Coronary Care Unit, isolated ventricular ectopic
Lead-in keywords: inform the physician and
Clinical cues: The term 'isolated' is a key clinical cue, indicating a single, infrequent event rather than a sustained or dangerous rhythm.

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E6 Medicine Davidson Principles Practice 24e p. 515-517

E6 Medicine Harrison 22e Part 1 p. 2013-2015

Practise the full GMCH - 2016

Attempt every question from this paper in a timed mock, then review the full solution for each one.