A patient admitted in ICU. In the morning his blood report received from laboratory and potassium level is 6.5 mEq/L. Which of the following ECG finding can be associated with Hyperkalemia?

Appeared in: NORCET 3 - 2022 (Shift-2)

Explanation

A serum potassium level of 6.5 mEq/L indicates significant hyperkalemia, a medical emergency.
High potassium levels alter cardiac cell repolarization, causing distinct ECG changes.
The earliest and most characteristic ECG finding in hyperkalemia is the appearance of tall, peaked, or 'tented' T waves.
As hyperkalemia worsens, other changes like a prolonged PR interval and widened QRS complex can occur.

Option A: A prominent U wave is a hallmark ECG finding of hypokalemia (low potassium), not hyperkalemia.
Option B: ST segment depression is typically associated with hypokalemia or myocardial ischemia.
Option C: An inverted T wave is a sign of hypokalemia or myocardial ischemia, not an early sign of hyperkalemia.

Visual 1: ECG Strip - An ECG tracing clearly showing tall, peaked T waves, labeled as a key sign of hyperkalemia.
Visual 2: Comparative Chart - A side-by-side comparison of ECG strips for hyperkalemia (tall T wave, wide QRS) and hypokalemia (flat T wave, U wave).

Clinical Relevance

Nursing practice connection: Prioritize focused assessment, early escalation, and real-time monitoring when managing ECG Interpretation in Hyperkalemia in acute care settings.
Hyperkalemia is a life-threatening emergency because it can lead to fatal cardiac arrhythmias like ventricular fibrillation or asystole. Prompt recognition and treatment are critical.
Nurses in critical care must be able to identify the ECG signs of hyperkalemia, immediately notify the physician, and prepare for emergency interventions such as administering IV calcium gluconate, insulin, and dextrose.
What if? If the patient's potassium was 2.5 mEq/L (severe hypokalemia), the expected ECG findings would be ST depression, flattened T-waves, and prominent U-waves. The priority nursing intervention would be careful potassium replacement, not emergency measures to lower it.

How to Approach the Question

First, identify the critical information in the stem: the patient is in the ICU and has a potassium level of 6.5 mEq/L.
Recognize that a potassium level of 6.5 mEq/L is significantly elevated and is termed hyperkalemia (normal range is ~3.5-5.0 mEq/L).
Recall the classic ECG changes associated with electrolyte imbalances, specifically hyperkalemia.
Evaluate the options. The earliest and most characteristic sign of hyperkalemia is a tall, peaked T wave.
Eliminate the other options by recognizing them as signs of hypokalemia (prominent U wave, ST depression, inverted T wave).

Concept Tested & Keywords

Concept Tested: ECG Interpretation in Hyperkalemia
Stem keywords: ICU, potassium level, 6.5 mEq/L, ECG finding, Hyperkalemia
Lead-in keywords: Which of the following
Clinical cues: Potassium level of 6.5 mEq/L is a critical value indicating severe hyperkalemia.
Negative lead-in flag: false

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