A patient has hyperkalemia. The nurse knows that this condition can cause major life-threatening complications. Which of the following signs indicates a complication of hyperkalemia?

Appeared in: NORCET 7 Prelims -2024

Explanation

Hyperkalemia is a medical emergency primarily due to its profound and potentially fatal effects on the heart's electrical conduction system.
Potassium plays a critical role in the repolarization phase of the cardiac action potential.
The earliest and most classic electrocardiogram (ECG) manifestation of hyperkalemia is the presence of tall, peaked (or tented) T waves.
As hyperkalemia worsens, it can progress to severe cardiac dysrhythmias, including ventricular fibrillation and asystole (cardiac arrest).

Option B: A flat T wave is a classic sign of hypokalemia (low potassium), not hyperkalemia.
Option C: While a prolonged PR interval is a later sign of hyperkalemia, the most immediate and characteristic ECG change is the tall, tented T wave. Decreased blood pressure is a non-specific, later sign of cardiovascular compromise.
Option D: Shallow breathing and respiratory muscle weakness are complications of severe hypokalemia (low potassium), not hyperkalemia. Low potassium impairs skeletal muscle function, including the diaphragm.

Visual 1: ECG Strip - An ECG showing the progression of hyperkalemia, starting with tall, tented T waves, followed by a prolonged PR interval, loss of P waves, and widening of the QRS complex into a sine wave pattern. This helps visualize the life-threatening nature of the condition.

Clinical Relevance

Nursing practice connection: Use the key finding related to ECG changes and complications of hyperkalemia to guide bedside assessment, documentation, and the next nursing action.
A nurse's primary role is to immediately place a patient with suspected or confirmed hyperkalemia on a cardiac monitor to detect arrhythmias.
The nurse must be prepared to administer emergency medications as ordered, such as IV calcium gluconate to protect the heart, and IV insulin with glucose to shift potassium back into the cells.
Monitoring intake and output is crucial, especially if diuretics are used to promote potassium excretion. The nurse must also monitor for signs of fluid overload or dehydration.

How to Approach the Question

First, identify the core concept of the question, which is 'hyperkalemia' and its 'life-threatening complications'.
Recall that potassium's primary role is in muscle and nerve function, with the most critical impact being on the cardiac muscle.
Think about the specific ECG changes associated with electrolyte imbalances. For hyperkalemia, the hallmark sign is related to the T wave.
Evaluate the options. Option A directly links cardiac dysrhythmia with the classic 'tall, tented T wave' of hyperkalemia.
Eliminate the other options by identifying their association with other conditions. A flat T wave (Option B) and shallow breathing (Option D) are linked to hypokalemia. A prolonged PR interval (Option C) is a later sign, making the T-wave change the most indicative initial complication.

Concept Tested & Keywords

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Attempt every question from this paper in a timed mock, then review the full solution for each one.