JIBC PCP Nephrology Practice Exam 2025 - Free Nephrology Practice Questions and Study Guide

Hyperkalemia, which refers to elevated levels of potassium in the blood, can significantly impact cardiac function. High potassium levels can disrupt the normal electrical activity of the heart, leading to various types of arrhythmias. These disturbances can manifest as irregular heartbeat patterns, which may progress to more severe conditions such as ventricular fibrillation or even cardiac arrest, both of which are life-threatening emergencies.

Understanding the effects of potassium on cardiac physiology is vital for recognizing the risks associated with hyperkalemia. In particular, potassium is crucial in maintaining the resting membrane potential of cardiac myocytes; excess potassium can reduce the heart's excitability and alter conduction pathways, setting the stage for these dangerous cardiac events.

The other options do not accurately reflect the consequences of hyperkalemia. Increased appetite, frequent urination, and weight gain are not direct complications of elevated potassium levels. Instead, these symptoms may be associated with other conditions or factors unrelated to hyperkalemia. Thus, recognizing the serious risks that hyperkalemia poses to cardiac health is essential for appropriate clinical management.