A patient's ECG shows ST depression with abnormal QRS complex. Which management is most appropriate?

NORCET 9 Mains - 2025

Medical & Surgical Nursing

Hard

Appeared in: NORCET 9 Mains - 2025

Explanation

The ECG finding of an 'abnormal QRS complex' in a tachycardia suggests a wide-complex tachycardia (WCT), with Ventricular Tachycardia (VT) being the most common cause.
ST depression indicates myocardial ischemia, which is a frequent trigger for VT.
In a hemodynamically stable patient (as instability is not described), the standard of care is to use intravenous antiarrhythmic medication to control the rhythm.
Amiodarone is a potent, broad-spectrum antiarrhythmic agent and a first-line choice for managing stable WCT, as confirmed by ACLS guidelines.

Option A: Cardioversion is an electrical therapy, not the first-line treatment for a stable patient. It is reserved for patients who are hemodynamically unstable.
Option C: Pacing is used to increase the heart rate. This patient has a tachycardia (fast heart rate), so pacing is contraindicated.
Option D: Defibrillation is an unsynchronized shock used for pulseless cardiac arrest rhythms. The question implies the patient has a pulse and is being 'managed', not resuscitated.

Visual 1: ECG Strip - An example of monomorphic ventricular tachycardia, showing a rapid, regular rhythm with wide QRS complexes and ST depression, to help learners recognize the pattern.
Visual 2: Flowchart - A simplified algorithm for managing tachycardia, showing the decision points for stability, QRS width, and the corresponding treatments (medication, cardioversion, defibrillation).

Clinical Relevance

Nursing practice connection: Use the key finding related to Management of Stable Wide-Complex Tachycardia to guide bedside assessment, documentation, and the next nursing action.
The immediate assessment of a patient's hemodynamic stability (pulse, blood pressure, consciousness) is the most critical nursing action when a tachycardia is identified, as it dictates whether to use medication or immediate electrical therapy.
Nurses must have IV access established, place the patient on a cardiac monitor, and have a crash cart with a defibrillator/cardioverter readily available when managing any patient with a significant arrhythmia.
What if? - If the patient with this ECG had a blood pressure of 75/50 mmHg and was confused, the most appropriate management would change to immediate synchronized cardioversion due to hemodynamic instability.

How to Approach the Question

First, interpret the ECG findings. 'Abnormal QRS complex' in a tachycardia points towards a wide-complex rhythm, likely Ventricular Tachycardia (VT). 'ST depression' suggests ischemia is the underlying cause.
Next, assess for patient stability. Since the question provides no signs of instability (like hypotension, shock, or altered mental status), assume the patient is stable.
Recall the Advanced Cardiac Life Support (ACLS) algorithm for tachycardia. The algorithm branches based on patient stability.
For a stable patient with a wide-complex tachycardia, the recommended treatment is an IV antiarrhythmic medication.
Evaluate the options based on this algorithm. Amiodarone is a primary antiarrhythmic for this condition. Cardioversion is for unstable patients, defibrillation is for pulseless patients, and pacing is for bradycardia.

Concept Tested & Keywords

Concept Tested: Management of Stable Wide-Complex Tachycardia
Stem keywords: ECG, ST depression, abnormal QRS complex, tachycardia
Lead-in keywords: most appropriate
Clinical cues: The combination of 'ST depression' (ischemia) and 'abnormal QRS' (ventricular origin) points to Ventricular Tachycardia.
Negative lead-in flag: false

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