The UCSF Electrophysiology and Arrhythmia Service are committed to providing you with the most technically advanced and personalized care. Our Electrophysiology team has a reputation for excellence in the evaluation and treatment of patients with a variety of cardiac arrhythmias (abnormal heart rhythms). Electrophysiology, a sub-specialty of cardiology, is a rapidly growing field on the forefront of discovering cures and new treatment for all forms of arrhythmias. In the 1980's, doctors at UCSF pioneered the use of catheter ablation. Today, catheter ablation cures a variety of cardiac arrhythmias. With the rapid advancements in the electrophysiology field, it can even leave cardiologists without special training in electrophysiology perplexed, not to mention consumers. To familiarize you with electrophysiology study and cardiac arrhythmias, pacemakers and implantable defibrillators, we have prepared the following pages- A Guide to Arrhythmias The Electrocardiogram (ECG) ICD's