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
- A serum potassium level of 6.3 mg/dl is significantly elevated above the normal range of 3.5-5.0 mEq/L, defining a state of hyperkalemia.
- In patients with kidney failure, the ability to excrete potassium is diminished, making hyperkalemia a common and expected complication.
- The earliest and most classic electrocardiogram (ECG) change associated with hyperkalemia is the development of tall, narrow, and peaked T waves, often referred to as 'tented' T waves.
- This ECG change is a direct result of altered cardiac myocyte repolarization caused by the high extracellular potassium concentration.
Why Other Options Were Wrong
- Option A: A flattened T wave is characteristic of hypokalemia (low potassium), not hyperkalemia. It represents delayed ventricular repolarization.
- Option C: ST segment elevation is a primary indicator of acute, transmural myocardial injury (heart attack) or acute pericarditis. It is not a typical finding of hyperkalemia.
- Option D: ST segment depression typically signifies myocardial ischemia (inadequate blood flow to the heart muscle) or can also be a feature of hypokalemia or digitalis effect.
Related Visual
Clinical Relevance
- Nursing practice connection: Use the key finding related to ECG Interpretation in Electrolyte Imbalances (Hyperkalemia) to guide bedside assessment, documentation, and the next nursing action.
- Hyperkalemia is a life-threatening medical emergency, particularly common in patients with renal failure. Prompt recognition of its ECG signs is a critical nursing skill to facilitate timely intervention and prevent cardiac arrest.
- Nurses caring for patients with kidney disease must diligently monitor laboratory values, especially serum potassium. If hyperkalemia is detected, the nurse should immediately assess the patient, place them on a cardiac monitor, and notify the physician.
- What if? If the patient's potassium level was 2.8 mEq/L (hypokalemia), the nurse would anticipate seeing flattened T waves, ST depression, and the appearance of a prominent U wave on the ECG.
How to Approach the Question
- First, identify and interpret the key clinical data provided in the question stem: the patient has 'kidney failure' and a 'potassium level of 6.3 mg/dl'.
- Recognize that a potassium level of 6.3 mg/dl is significantly above the normal range (approx. 3.5-5.0 mEq/L), which defines the condition as hyperkalemia.
- Connect the patient's diagnosis (kidney failure) to the lab finding (hyperkalemia), understanding that impaired renal function leads to potassium retention.
- Recall the specific ECG manifestations of electrolyte imbalances. Focus on the classic, initial sign of hyperkalemia.
- Evaluate the options provided. 'Peaked T wave' is the well-known early ECG finding for hyperkalemia.
- Confirm your answer by mentally eliminating the other options, recalling their primary associations: flattened T wave with hypokalemia, ST elevation with MI, and ST depression with ischemia.
Concept Tested & Keywords
- Concept Tested: ECG Interpretation in Electrolyte Imbalances (Hyperkalemia)
- Stem keywords: ECG finding, kidney failure, potassium level 6.3 mg/dl
- Lead-in keywords: Which of the following
- Clinical cues: Potassium level 6.3 mg/dl indicates hyperkalemia
- Clinical cues: Kidney failure impairs potassium excretion
Question ID
Qe4q2dm2jENpnWzVZPqqGc
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. 1915-1917
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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