Hi Colleen - THANK YOU for this message (by the way, I started a reply earlier and lost it - so if you get two replies, that is why). I found Dr. Timimi's explanation very helpful. Another individual indicated that AFib was a factor (I do have AFib, but am currently in NSR). I also experience shortness of breath - can't climb a staircase without huffing and puffing, nor walk up a hill. I did not realize that this diastolic heart failure could be a cause for my SOB, since I also have CLL and other issues. NO ONE seems to be familiar with this, and I SO appreciate the information! Heart failure is generally considered when EF is 20 or 25. Mine is 64. My doctor says age is a factor. If that is so, why do I not hear of it frequently? There are many of us over 70! Thanks again for the information. I would love to hear from others who have been diagnosed with thickening or diastolic heart failure and hear what they do and how they manage it. My doctor is recommending Jardiance. I am a bit concerned because I am not diabetic. As you can see, I have lots of questions and concerns, so I appreciate any information.