Which of the following electrocardiogram finding would be seen in a client with Hyperkalemia?

NORCET 5 Prelims - Sept 2023 (Shift-1)

Medical Surgical Nursing

Easy

Appeared in: NORCET 5 Prelims - Sept 2023 (Shift-1)

Explanation

A widened QRS complex is a hallmark ECG change seen in moderate to severe hyperkalemia, typically when serum potassium levels are greater than 6.5 mEq/L.
This change occurs because high extracellular potassium slows down intraventricular depolarization, delaying the time it takes for the electrical impulse to travel through the ventricles.
As hyperkalemia worsens, the QRS complex continues to widen and can eventually merge with the T-wave to form a dangerous sine-wave pattern, a precursor to cardiac arrest.

Option A: ST depression is not a primary or specific indicator of hyperkalemia.
Option B: T-wave inversion is not a characteristic feature of hyperkalemia. In fact, hyperkalemia initially causes T-waves to become taller and peaked.
Option D: A flat T-wave is the opposite of the typical T-wave change seen in hyperkalemia.

Visual 1: Infographic: Progression of ECG Changes in Hyperkalemia. This visual should depict the sequence of changes from normal sinus rhythm to severe hyperkalemia: 1. Tall, peaked T-waves (mild). 2. Prolonged PR interval and flattening P-wave (moderate). 3. Widened QRS complex (moderate-severe). 4. Sine-wave pattern and asystole (severe).

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain ECG Interpretation in Hyperkalemia as background academic context rather than a clinical decision trigger.
Recognizing the ECG changes of hyperkalemia is a critical nursing skill, as it is a medical emergency that can lead to life-threatening cardiac arrhythmias and cardiac arrest.
Nurses must immediately report ECG findings suggestive of hyperkalemia (e.g., peaked T-waves, wide QRS) to the provider and prepare for emergency interventions like administering calcium gluconate, insulin with dextrose, or sodium polystyrene sulfonate.
What if? If the ECG showed prominent U-waves and flat T-waves instead, the nurse should suspect hypokalemia, which also requires urgent intervention but with potassium replacement, not removal.

How to Approach the Question

First, identify the core concept: the question asks for an ECG finding of hyperkalemia (high potassium).
Recall the progressive effects of hyperkalemia on the heart's electrical activity. Remember the mnemonic 'Hyper-T' for tall, peaked T-waves as the first sign.
Visualize the progression shown in the image or from memory: Peaked T-waves → PR prolongation → P-wave flattening → QRS widening → Sine wave.
Evaluate each option. 'Widened QRS complex' directly matches a known, severe sign of hyperkalemia.
Eliminate the other options. 'Flat T wave' is a classic sign of the opposite condition, hypokalemia. 'ST depression' and 'Inverted T wave' are more commonly associated with ischemia.

Concept Tested & Keywords

QBCK21JhgXuH9Y0ixIR-_q