"This book is incredibly complete and easy-to-understand for anybody. I certainly recommend it for patients who want to know more about atrial fibrillation than what they will learn from doctors...."

Pierre Jaïs, M.D. Professor of Cardiology, Haut-Lévêque Hospital, Bordeaux, France

"Dear Steve, I saw a patient this morning with your book [in hand] and highlights throughout. She loves it and finds it very useful to help her in dealing with atrial fibrillation."

Dr. Wilber Su Cavanaugh Heart Center, Phoenix, AZ

"Your book [Beat Your A-Fib] is the quintessential most important guide not only for the individual experiencing atrial fibrillation and his family, but also for primary physicians, and cardiologists."

Jane-Alexandra Krehbiel, nurse, blogger and author "Rational Preparedness: A Primer to Preparedness"


"Steve Ryan's summaries of the Boston A-Fib Symposium are terrific. Steve has the ability to synthesize and communicate accurately in clear and simple terms the essence of complex subjects. This is an exceptional skill and a great service to patients with atrial fibrillation."

Dr. Jeremy Ruskin of Mass. General Hospital and Harvard Medical School

"I love your [A-fib.com] website, Patti and Steve! An excellent resource for anybody seeking credible science on atrial fibrillation plus compelling real-life stories from others living with A-Fib. Congratulations…"

Carolyn Thomas, blogger and heart attack survivor; MyHeartSisters.org

"Steve, your website was so helpful. Thank you! After two ablations I am now A-fib free. You are a great help to a lot of people, keep up the good work."

Terry Traver, former A-Fib patient

"If you want to do some research on AF go to A-Fib.com by Steve Ryan, this site was a big help to me, and helped me be free of AF."

Roy Salmon Patient, A-Fib Free; pacemakerclub.com, Sept. 2013

 FAQs Understanding A-Fib: Stiff Heart

FAQs Understanding Your A-Fib A-Fib.com7. I’ve heard about ‘stiff heart’ or diastolic dysfunction. When you have A-Fib, do you automatically have diastolic heart failure? What exactly is diastolic dysfunction?

Someone with A-Fib can have much the same symptoms as someone with a ‘stiff heart’ or diastolic dysfunction. But A-Fib is an electrical problem that is often fixable, whereas diastolic dysfunction is a structural (or plumbing) problem usually not easily fixed.

Here are some statements from doctors I asked about this question:

• “Diastolic dysfunction (stiff heart) can lead to congestive heart failure. A-Fib is electrical. But some patients with A-Fib also have diastolic dysfunction.”

• “While many people with A-Fib do indeed have diastolic dysfunction (usually as a result of hypertension), this is not always the case.  On the other hand, there is no doubt that hypertension and the consequent effect on atrial stretch exacerbates the situation.  Perhaps the best way to think about it is that based on one’s genetic predisposition, one has a certain propensity to develop A-Fib. This can be modulated (i.e., exacerbated) by conditions that increase atrial pressure—such as hypertension, valve disease, heart failure, etc.”

Diastolic dysfunction refers to a decline in performance of one or both ventricles. ‘Diastole’ refers to the time when the ventricles are relaxing and filling with incoming blood as compared to when the ventricles are propelling blood out to the rest of the body. Diastolic Dysfunction may refer to both the left atrium and left ventricle being stiff and not functioning properly. (Whereas in A-Fib the focus is on the left atrium.)

When someone in A-Fib is restored to normal sinus rhythm, usually both the left atrium and left ventricle begin to function normally again. But someone with long term A-Fib may also develop an anatomical or mechanical pumping problem—diastolic dysfunction (stiff heart), fibrosis, scarring, cardiomyopathy, etc. which are more permanent and harder to improve. (Another reason to treat your A-Fib as soon as possible.)

Last updated: Monday, February 13, 2017

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