What condition is characterized by spiked T waves on an ECG?

Spiked T waves on an ECG are a classic indication of hyperkalemia, which is an elevated level of potassium in the bloodstream. The presence of these abnormal T waves occurs because potassium plays a critical role in the electrical activity of the heart. When potassium levels are high, it affects cardiac repolarization, leading to the characteristic changes observed on the ECG, such as peaked or spiked T waves.

In contrast, other conditions such as hypokalemia, metabolic alkalosis, and severe dehydration present with different ECG changes and symptoms. Hypokalemia typically manifests with flattened T waves and the presence of U waves, while metabolic alkalosis may not show significant T wave changes. Severe dehydration often leads to changes associated with electrolyte imbalances but does not specifically cause spiked T waves. Understanding these ECG changes is crucial for the diagnosis and management of hyperkalemia.