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Dr. John Day is a cardiologist specializing in the treatment of atrial fibrillation and other abnormal heart rhythm conditions at St. Mark’s Hospital in Salt Lake City, Utah. He received his medical degree from John Hopkins and completed his residency and fellowships in cardiovascular medicine and cardiac electrophysiology at Stanford University.  Dr. John Day is board certified in cardiology and cardiac electrophysiology.

• Since 2004, Dr. John Day has appeared as a health expert on all of the major television networks. For several years he had a weekly television segment on the CBS affiliate in Utah.  Over 65,000 people now follow him through his newsletter, blog, or social media channels.
• In 2017 Dr. John Day published his first book, The Longevity Plan.  This book went on to become an Amazon number one best seller and was named best books of 2017 by the Huffington Post.
• In 2021 Dr. John Day published his second book, The Atrial Fibrillation Cure which was also an Amazon best-seller and was the top selling book in the entire cardiovascular space for over two months.
• In addition to his books, Dr. John Day is the prolific author of more than 100 studies that have been published in many of the most prestigious scientific and medical journals.  He also is the founding editor-in-chief of the Innovations in Cardiac Rhythm Management medical journal.
• Dr. Day is also a researcher and pioneer in the field of electrophysiology, with a patent on technology that allows physicians to map the source of atrial fibrillation three-dimensionally.

https://drjohnday.com/

"Long time, competitive endurance athletes have a higher risks of AFib, which is a marker of premature aging. The faster you solve AFib, the better your long-term outcome. Ablation technologies have come a long way….success rates of 80-90% can be expected."

• Atrial fibrillation (AFib or AF) is the most common type of treated heart arrhythmia. An arrhythmia is when the heart beats too slowly, too fast, or in an irregular way.
• When a person has AFib, the normal beating in the upper chambers of the heart (the two atria) is irregular, and blood doesn’t flow as well as it should from the atria to the lower chambers of the heart (the two ventricles). AFib may happen in brief episodes, or it may be a permanent condition.

To become an EP takes an extra 2 years of trining.  EP’s deal with every electrical related to the heart.  Treatments:  ablation, pacemakers, etc.