What is an abnormal rhythm in the electrical activity of the brain or heart called?

An abnormal rhythm in the electrical activity of the brain or heart is referred to as dysrhythmia. This term specifically describes irregularities in the rhythm of the heartbeat, which can lead to various cardiac conditions, or deviations in the brain's electrical activity, which can affect neurological function. Dysrhythmias can manifest as tachycardia (too fast), bradycardia (too slow), or other irregular heartbeats, and can be critical to diagnose and manage due to their impact on overall health.

The other options are related to different medical conditions: dyspepsia pertains to digestive issues and discomfort in the upper abdomen, dysuria involves painful or difficult urination typically associated with urinary tract problems, and dystrophy refers to a disorder that leads to weakness and degeneration of tissues or organs, often linked to muscular or neurological impairments. Thus, these terms do not apply to the electrical activity of the brain or heart.