The term cardiac<unk>  covers a very large number of very different conditions. The most common symptom of<unk>  is an awareness of an abnormal heartbeat, called palpitations. These may be infrequent, frequent, or continuous. Some of these<unk> s<unk> e harmless (though distracting for patients) but some of them predispose to adverse outcomes. Some<unk> s do not cause symptoms and<unk> e not associated with increased mortality. However, some asymptomatic<unk> s<unk> e associated with adverse events. Examples include a higher risk of blood clotting within the heart and a higher risk of insufficient blood being transported to the heart because of a weak heartbeat. Other increased risks<unk> e of embolization and stroke, heart failure, and sudden cardiac death. If an<unk>  results in a heartbeat that is too fast, too slow, or too weak to supply the body's needs, this manifests as lower blood pressure and may cause lightheadedness or dizziness, or syncope (fainting). Some types of<unk>  result in cardiac<unk> rest, or sudden death. Medical assessment of the abnormality using an electrocardiogram is one way to diagnose and assess the risk of any given<unk> .
Arrhythmia
Drowning
Proarrhythmia
Atrial fibrillation
Hypsarrhythmia
Reflex syncope  Reflex syncope  1
Cardiovascular drift
Myocardial infarction