Oncology Certified Nurse (OCN) Nursing Practice Test

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Prepare for the Oncology Certified Nurse Test. Engage with flashcards and multiple choice questions; each question includes hints and explanations. Ensure success on your exam!

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Which two abnormalities can interfere with cardiac function?

Sodium and Magnesium
Potassium and Calcium
Calcium and Phosphorus
Chloride and Bicarbonate

The correct answer is: Potassium and Calcium

Potassium and calcium are crucial for maintaining normal cardiac function. An imbalance in potassium levels, either hypokalemia (low potassium) or hyperkalemia (high potassium), can significantly impact the heart's electrical conduction system. Potassium is essential for the repolarization of cardiac cells; disruptions in its levels can lead to arrhythmias or changes in heart rhythms. Similarly, calcium plays a vital role in the contraction and relaxation of the heart muscle. Abnormal calcium levels can alter the heart's contractility. Low calcium (hypocalcemia) can lead to decreased myocardial contractility, while high levels (hypercalcemia) can increase the risk of arrhythmias and other cardiac issues. Together, these two electrolytes are key players in ensuring that the heart beats effectively and maintains appropriate rhythm and strength during contractions.