A Nurse/CHO is checking a patient's Electrolytes Lab report, and if the potassium level is 8.2 mEq/L, what will the Nurse/CHO note in the ECG results?

1. A

   Elevated T Waves

2. B

   Absent P waves

3. C

   Elevated ST segment

4. D

   Prominent U wave

Appeared in: Uttarakhand CHO - 2021

Explanation

• A potassium level of 8.2 mEq/L signifies severe, life-threatening hyperkalemia.
• In severe hyperkalemia (K+ greater than 8.0 mEq/L), conduction through the atria is suppressed, leading to the flattening and eventual disappearance of the P wave.
• As the condition worsens, the QRS complex widens and merges with the T wave, creating a dangerous 'sine-wave' pattern, which is a precursor to ventricular fibrillation or asystole.
• The provided ECG image demonstrates this sine-wave pattern, a classic sign of severe hyperkalemia which includes absent P waves.

Why Other Options Were Wrong

• Option A: Tall, peaked, or 'tented' T waves are the earliest sign of hyperkalemia, typically seen at potassium levels of 5.5–6.5 mEq/L. At 8.2 mEq/L, the ECG changes have progressed to a more severe stage.
• Option C: ST-segment elevation is a hallmark of acute myocardial infarction (STEMI), not hyperkalemia. Hyperkalemia may cause ST-segment depression.
• Option D: A prominent U wave is a classic ECG finding in hypokalemia (low potassium), the opposite of the condition presented.

Related Visual

Clinical Relevance

• Nursing practice connection: Use the key finding related to ECG interpretation in severe hyperkalemia to guide bedside assessment, documentation, and the next nursing action.
• Recognizing the ECG changes of severe hyperkalemia is a critical nursing skill, as it indicates a medical emergency requiring immediate intervention to prevent fatal arrhythmias.
• The priority nursing action is to ensure continuous cardiac monitoring, notify the physician immediately, and prepare for emergency administration of medications like IV calcium gluconate to stabilize the cardiac membrane.
• What if? If the potassium level was 6.0 mEq/L, the nurse would primarily expect to see tall, peaked T waves, and the urgency, while still high, would be less critical than at 8.2 mEq/L.

How to Approach the Question

• First, identify the critical lab value provided in the question: potassium level of 8.2 mEq/L.
• Second, classify this value. A normal potassium level is 3.5-5.0 mEq/L, so 8.2 mEq/L is severe, life-threatening hyperkalemia.
• Third, recall the progressive stages of ECG changes associated with hyperkalemia. Remember that the changes worsen as the potassium level rises.
• Fourth, match the severity of the hyperkalemia (severe) with the corresponding ECG finding. At levels above 8.0 mEq/L, P waves disappear and a sine-wave pattern may form.
• Finally, evaluate the options. Eliminate choices associated with mild hyperkalemia (peaked T waves), other conditions (ST elevation for MI), or the opposite condition (U waves for hypokalemia).

Concept Tested & Keywords

• Concept Tested: ECG interpretation in severe hyperkalemia.
• Stem keywords: Electrolytes Lab report, potassium level, 8.2 mEq/L, ECG results
• Lead-in keywords: what will the Nurse/CHO note
• Clinical cues: Potassium level of 8.2 mEq/L indicates severe, life-threatening hyperkalemia.
• Negative lead-in flag: false

Question ID

QhSegIEBMclFU9kDCoOSZx

Copy ID

Reference Book

E6 Nelson Textbook of Pediatrics(2024) — Volume 1 p. 542-544

E6 Gynecology Williams p. 64-85

E6 Medicine Harrison 22e Part 1 p. 1911-1913