A nurse is reviewing an ECG that shows ventricular tachycardia. Which of the following characteristics would… - NORCET 7 Prelims -2024

NORCET 7 Prelims -2024

Medical Surgical Nursing

Easy

Appeared in: NORCET 7 Prelims -2024

Explanation

Ventricular Tachycardia (VT) is defined as a heart rate greater than 100 beats per minute originating from an ectopic site within the ventricles.
The electrical impulse spreads abnormally through the ventricular muscle instead of the fast His-Purkinje conduction pathway.
This slow, abnormal conduction results in a widened QRS complex, defined as a duration greater than 0.12 seconds.
The combination of a rapid rate and wide QRS complexes is the hallmark and most evident characteristic of VT on an ECG.

Option A: This is incorrect because VT is a 'tachycardia,' which means a rapid heart rate (over 100 bpm), not a slow one.
Option B: While P waves are often obscured or dissociated in VT, this is not the most specific or evident finding. The QRS morphology is more prominent.
Option C: The primary and most obvious abnormality in VT is the wide QRS complex, not the P wave. P waves may be present and normal but are not associated with the ventricular beats (AV dissociation).

Visual 1: ECG Strip - A sample ECG showing classic ventricular tachycardia. Annotations should highlight the rapid rate (R-R interval), the wide QRS complex (duration > 0.12s), and the regular rhythm.
Visual 2: Diagram - A flowchart comparing the normal cardiac conduction pathway (SA node -> AV node -> His-Purkinje) with the abnormal pathway in ventricular tachycardia (ectopic focus in ventricle -> slow cell-to-cell spread).

Clinical Relevance

Nursing practice connection: Prioritize focused assessment, early escalation, and real-time monitoring when managing ECG Interpretation of Ventricular Tachycardia in acute care settings.
Recognizing VT is a critical nursing skill as it can be a life-threatening arrhythmia that may rapidly deteriorate into ventricular fibrillation and cardiac arrest.
A key nursing responsibility is to immediately assess the patient's stability by checking for a pulse, blood pressure, and level of consciousness. This assessment determines whether the treatment is urgent cardioversion/defibrillation or medication.
What if? If the patient with a wide-complex tachycardia is unstable (hypotensive, altered mental status, signs of shock) but has a pulse, the immediate intervention is synchronized cardioversion, not defibrillation. If there is no pulse, the intervention is immediate defibrillation and CPR.

How to Approach the Question

First, analyze the question. It asks for the 'most evident' characteristic of ventricular tachycardia (VT) on an ECG.
Break down the term 'ventricular tachycardia'. 'Tachycardia' means a rapid heart rate (over 100 bpm), which immediately rules out any options involving 'slow' heartbeats.
Next, consider 'ventricular'. This means the rhythm originates in the ventricles, bypassing the normal fast conduction pathways.
Recall that abnormal ventricular conduction is slow and inefficient, which manifests as a wide QRS complex (greater than 0.12 seconds) on the ECG.
Combine these two core features: a rapid rate and a wide QRS complex. This points directly to the correct answer.
Evaluate the other options. While P-wave changes (or their absence) are common in VT, the most striking and defining feature is the morphology of the QRS complex combined with the fast rate.

Concept Tested & Keywords

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