The rhythmic control of the cardiac cycle and its accompanying heartbeat relies on the regulation of impulses generated and conducted within the heart. Regulation of the cardiac cycle is also achieved via the autonomic nervous system. The sympathetic...

Atrial fibrillation (AF or afib) is a cardiac arrhythmia (abnormal heart rhythm) that involves the two upper chambers (atria) of the heart. It is defined as being irregularly irregular, and can often be identified as such when taking a pulse. Atrial...

Atrial fibrillation (AF) is the most common sustained cardiac arrhythmia and accounts for more physician visits and hospital days than any other cardiac rhythm disturbance. Atrial filbrillation is incresing in frequency as the population ages, and therefore, a knowledge of the clinical spectrum and...

Daubert et al. (1) from France, introduced dual-site or multisite atrial pacing about 10 years ago for the treatment of severe atrial conduction delays in patients with sick sinus syndrome. In this situation, propagation of activation from a right atrial pacing site to the...

Vice President Dick Cheney was back at work Tuesday after doctors administered an electrical shock to his heart and restored it to a normal rhythm after he experienced an irregular heartbeat."He feels fine. He is not in any pain," said press secretary Megan Mitchell. Cheney...

Vice President Dick Cheney was back at work Tuesday after doctors administered an electrical shock to his heart and restored it to a normal rhythm after he experienced an irregular heartbeat."He feels fine. He is not in any pain," said press secretary Megan Mitchell. Cheney...