Which of the following is a consequence of hyperkalemia?

Hyperkalemia, which is characterized by elevated potassium levels in the blood, can have significant effects on the heart's electrical activity, as well as other physiological functions. One of the hallmark electrocardiographic changes associated with hyperkalemia is the presence of tall, peaked T waves. This abnormality occurs due to the increased extracellular potassium concentration, which affects the repolarization phase of the cardiac action potential. The tall, peaked T waves reflect the heightened excitability of myocardial cells, which is a direct result of changes in the ionic environment during hyperkalemia.

While other choices may represent effects of different electrolyte imbalances or cardiovascular conditions, tall peaked T waves are specifically indicative of elevated potassium. Understanding this association is crucial for recognizing and managing the risks linked to hyperkalemia in clinical settings.