A nurse is caring for a patient with hyperkalemia. The nurse knows that the most likely complication of this… - NORCET 7 Prelims -2024

NORCET 7 Prelims -2024

Medical & Surgical Nursing

Easy

Appeared in: NORCET 7 Prelims -2024

Explanation

Hyperkalemia's most critical effect is on the heart's electrical conduction system, making cardiac complications the most immediate life-threat.
High potassium levels alter the resting membrane potential of cardiac cells, leading to instability and arrhythmias.
The earliest electrocardiogram (ECG) sign of hyperkalemia is typically tall, peaked (tented) T waves.
As potassium levels rise, ECG changes progress to PR prolongation, loss of P waves, QRS widening, and potentially fatal rhythms like ventricular fibrillation or asystole.

Option B: Hyperkalemia does not typically cause increased blood pressure. In fact, severe hyperkalemia can lead to hypotension (low blood pressure) due to decreased cardiac output from arrhythmias.
Option C: Decreased urine output (oliguria) is a common cause of hyperkalemia, not a complication. When the kidneys produce less urine, they are unable to excrete potassium effectively, causing it to build up in the blood.
Option D: Acute kidney injury (AKI) is a primary cause of hyperkalemia, not a complication. Damaged kidneys lose their ability to filter and excrete potassium, leading to its accumulation.

Visual 1: Diagram: An ECG strip showing the progression of changes in hyperkalemia, starting with peaked T-waves, then a widened QRS, and finally a sine wave pattern. This helps visualize the increasing cardiac toxicity.
Visual 2: Flowchart: A simple flowchart illustrating how acute kidney injury leads to decreased potassium excretion, resulting in hyperkalemia, which in turn causes cardiac dysrhythmias.

Clinical Relevance

Nursing practice connection: Use the key finding related to Complications of Hyperkalemia to guide bedside assessment, documentation, and the next nursing action.
A nurse's primary responsibility for a patient with hyperkalemia is continuous cardiac monitoring to detect early ECG changes. Recognizing peaked T-waves is a critical skill that prompts immediate intervention.
Hyperkalemia is a medical emergency. The nurse must be prepared to administer emergency medications like IV calcium gluconate, insulin/dextrose, and prepare the patient for potential dialysis.
What if? If the patient had hypokalemia (low potassium) instead, the nurse would monitor for different ECG changes, such as flattened T-waves, U-waves, and ST depression, and be vigilant for different types of arrhythmias like PVCs or ventricular tachycardia.

How to Approach the Question

First, identify the core concept in the question: 'complication of hyperkalemia'.
Recall the primary function of potassium in the body, focusing on its role in muscle and nerve cells, especially the heart.
Differentiate between a 'complication' (a result of the condition) and a 'cause' (what leads to the condition).
Evaluate each option. 'Cardiac dysrhythmias' are a direct result of potassium's effect on heart cells.
Recognize that 'Decreased urine output' and 'Acute kidney injury' are classic causes of hyperkalemia because the kidneys are responsible for potassium excretion.
Eliminate 'Increased blood pressure' as it is not a typical finding; severe cases can cause the opposite (hypotension). This leads to the correct answer.

Concept Tested & Keywords

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