NORCET -4 , 2023
Medical & Surgical Nursing
Easy
Which of the following ECG finding would be seen in a patient with kidney failure with potassium level 6.3 mg/dl?
Appeared in: NORCET -4 , 2023
Explanation
- The patient's potassium level of 6.3 mEq/L is significantly elevated, indicating hyperkalemia (normal: 3.5-5.0 mEq/L).
- Kidney failure is a primary cause of hyperkalemia because the kidneys are responsible for excreting excess potassium from the body.
- Hyperkalemia alters myocardial repolarization, causing the cell membrane to repolarize more rapidly.
- This rapid repolarization manifests on the ECG as tall, narrow, and peaked T-waves, which is the earliest and most characteristic sign of hyperkalemia.
Why Other Options Were Wrong
- Option A: Flattened T-waves are a characteristic sign of hypokalemia (low potassium levels), not hyperkalemia.
- Option C: ST-segment elevation is a primary indicator of acute myocardial injury (heart attack), where there is transmural ischemia.
- Option D: ST-segment depression is typically associated with myocardial ischemia (inadequate blood flow to the heart muscle) or hypokalemia.
Related Visual
- Visual 1: ECG strip showing peaked T waves. Caption: This visual demonstrates the characteristic tall, narrow, 'tented' T-waves seen in hyperkalemia, helping learners recognize this critical finding.
- Visual 2: Comparative diagram of ECG changes in hyperkalemia vs. hypokalemia. Caption: This side-by-side comparison highlights the opposite effects of high and low potassium on the T-wave and QRS complex, reinforcing the diagnostic differences.
Clinical Relevance
- Nursing practice connection: Use the key finding related to ECG interpretation in hyperkalemia secondary to renal failure to guide bedside assessment, documentation, and the next nursing action.
- Hyperkalemia is a medical emergency due to its potential to cause life-threatening cardiac arrhythmias. Nurses must promptly recognize ECG changes and report them to the provider.
- For patients with kidney disease, nurses play a crucial role in monitoring serum potassium levels, assessing for signs of hyperkalemia, and providing dietary education to limit potassium intake.
- What if? If the patient's potassium level was 2.8 mEq/L instead, the nurse would anticipate ECG changes of hypokalemia, such as flattened T-waves, ST depression, and the presence of a prominent U-wave.
How to Approach the Question
- First, identify the key information in the question: the patient has 'kidney failure' and a 'potassium level of 6.3'.
- Interpret the lab value. A potassium level of 6.3 is well above the normal range of 3.5-5.0 mEq/L, which defines hyperkalemia.
- Connect the clinical condition to the lab value. Kidney failure is a common cause of hyperkalemia because the kidneys cannot effectively excrete potassium.
- Recall the specific ECG changes associated with hyperkalemia. The earliest and most classic sign is a peaked T-wave.
- Evaluate the options. 'Peaked T wave' directly matches the expected finding. The other options are associated with different conditions (hypokalemia, myocardial infarction, ischemia).
Concept Tested & Keywords
- Concept Tested: ECG interpretation in hyperkalemia secondary to renal failure.
- Stem keywords: ECG finding, kidney failure, potassium level 6.3 mg/dl
- Lead-in keywords: Which
- Clinical cues: Potassium level 6.3 mEq/L indicates hyperkalemia.
- Clinical cues: Kidney failure impairs potassium excretion.
Question ID
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Practise the full NORCET -4 , 2023
Attempt every question from this paper in a timed mock, then review the full solution for each one.
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