arrhythmia
n. C / Un. an irregular or abnormal heartbeat. It can make your heart beat too fast, too slow, or in a strange pattern.
n. an abnormal heart rhythm, typically caused by a malfunction in the heart's electrical conduction system. Often used in medical contexts to describe conditions like tachycardia or bradycardia.
The doctor checked his heart for any signs of arrhythmia.
Patients with a history of arrhythmia often require a pacemaker to maintain a steady heartbeat during physical activity.
While some forms of arrhythmia are harmless and occur during periods of intense stress, others can lead to serious complications such as stroke or heart failure if left untreated.
Borrowed from New Latin arrhythmia, from Ancient Greek ἀρρυθμία (arrhuthmía), equivalent to a- + rhythm + -ia.