Pseudo-ventricular over and under-sensing during an episode of double tachycardia. What is the mechanism?defibrillation — ICDpacingcomputingNo abstract is available for this article.doi:10.1111/j.1540-8159.2009.02596.xDARDO E. FERRARADepartment of Cardiac Electrophysiology, Emory University, Atlanta, Georgia;MIKHAEL F. EL...
Atrial overdrive pacing, delivered from the retracted ventricular lead, stopped the tachycardia with AV nodal block, which is consistent with a supraventricular origin. The tracing on Figure 1B (bottom right), however, shows termination of the tachycardia (T2-zone, CL = 316 ms) with a 36-J...
What is the etiology of a heart attack? Does ischemic heart disease cause stroke? What is tachycardia induced cardiomyopathy? Can an occlusion in the carotid artery cause occipital lobe damage? What is coronary artery disease? What are the symptoms of a brain aneurysm?
Astrokeis a permanent injury to the brain caused by the blockage or bursting of a blood vessel. Those caused by a blockage are called ischemic strokes, and those caused when a blood vessel bursts are known as hemorrhagic strokes. Because they are treated differently, emergency doctors must work...
What is supraventricular tachycardia (SVT)? SVT is a condition that causes your heart to beat much faster than it should. SVT is a type of abnormal heart rhythm, called an arrhythmia, that starts in the upper part of your heart. It may last from a few seconds or hours to several days...
During an episode of tachycardia, the heart beats at least 100 beats a minute and may reach 300 beats a minute. These episodes may start and end quickly, and you may not even notice any symptoms at all. The condition only becomes a problem when it happens often, lasts too long, or cau...
Too high – Called tachycardia, it’s a heart rate consistently above 100 beats per minute. Too low – Called bradycardia, it’s a heart rate below 60 beats per minute (when you’re not an athlete). If your heart rate is too high or too low and/or you are also experiencing shortnes...
Studies are needed to define the physiology of AF termination, particularly if it occurs after extensive ablation and/or to atrial tachycardia,31 and if this is equivalent to termination to sinus rhythm (Figure 4). The CONFIRM trial (CONventional ablation with or without Focal Im...
Conduction disturbances:Electrical conduction disturbances may make the heartbeat too quickly (tachycardia) or too slowly (bradycardia), and either of these situations may result in an inadequate blood supply to the brain, causing dizziness or lightheadedness. ...
During an atrial fibrillation (AF) episode, the upper chambers of the heart quiver or fibrillate up to 400 times per minute. This impairs the normal pumping function of the heart significantly. The impaired pumping function results in a stagnation of blood in the heart, which in its turn inc...