But when those sensations are frequent, last more than a few seconds, or cause dizziness, fatigue, or fainting, it’s time to see an expert to find out why. Cardiac arrhythmias—the term for abnormal ...

Fainting (syncope) is a sudden loss of consciousness ... They also may order tests that include an electrocardiogram (12-lead EKG) to check heart rhythm. A Holter monitor test (ambulatory EKG ...

This reaction is known as a vasovagal syncope episode, also known as fainting. Vasovagal syncope is a temporary loss of consciousness. The vasovagal response, in which your blood pressure suddenly ...

Several companies started designing implantable diagnostic devices for syncope and general cardiac arrhythmia monitoring, [9–12] demonstrating a growing interest about this application not only ...

Sinus arrhythmia is a variation in the heart's sinus rhythm, usually caused by changes in a person's breathing cycle. It's a ...

A study suggests that those under age 65 may need no restrictions at all, but more data would help clarify the issue.