I am looking for studies on BAV replacement and either women included in the study equally or a 100% woman study. Because we react differently concerning heart health I am assuming we are unique concerning valve replacement and what works best for us.
Hi Bee.
I think that it's great that you want to read up on the medical literature. Also, in my view, you're doing so at the right time. We've seen members still in the mild or early moderate stages of severity overwhelm themselves with all the literature. A person who has mild AS could easily be 15+ years away from surgery and the decisions one might face could have a very different landscape by then. You're moderate, but near the 'severe' threshold, so you are not likely facing immediate surgery, but could realistically be facing it in the near future. Having said that, I certainly hope that your echos continue to show no progression. All this to say, the timing is right to take your time and digest some of the medical literature at a comfortable pace. I started my due diligence when I was moderate, near the severe AS threshold, as you are now. Ok, truth be told, I could not have started studying up any sooner because I was moderate/severe when first diagnosed, lol. I think I'm probably glad that my condition was not known until then- gave me plenty of time to read up and make informed choices but did not have anyone trying to get me to live life in a bubble growing up, nor take on any pointless anxiety.
There are hundreds, if not thousands, of studies that have been published regarding valve disease; mechanical vs tissue, specific valve brands, TAVI, TAVI vs SAVR, full sternotomy vs minimally invasive and so on. The amount of literature can be overwhelming. Also, per your comment about studies on women included equally or 100% women, you will find that the vast majority of studies in this area will have both men and women. There may be others, but the only area which comes to mind where there is a difference between men and women is with patient/valve mismatch. This would be where a valve was put in place which is too small, leading to a higher-pressure gradient and possible earlier valve failure. Mismatch occurrence is higher for women. But, this is not really an area where you will be making a decision. You will be asleep on the operating table when your surgeon decides on the valve size to insert.
My suggestion would be to narrow your focus to the areas in which you are likely to face choices.
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Mechanical vs tissue: It is not likely that this is an area for which there would be debate. At age 72, the guidelines call for a tissue valve. Probably every consult you receive from your cardiologist or surgeon will firmly place you in the tissue category, as a tissue valve will likely last you the rest of your life at age 72. Perhaps the only argument to go mechanical would be if at the time of surgery you happen to already be on warfarin anyway for something else, thus eliminating the main reason why people choose tissue.
SAVR vs TAVI (aka TAVR): At age 72, this is likely to be the choice that you will face. In my personal view, if I was 80+ years old, and eligible, I would go TAVI. If I was <70 years old, I would go SAVR, assuming I did not have any comorbidities which made me a high risk patient. 70-80 is probably where it gets a little tricky to decide which is the right choice and this is where being on top of the latest medical studies would be of benefit. I'm just sharing my view, if it were me, and you and your medical team might come up with a different view. Also, this is an area in which new studies are being published, so I would keep up with any new developments. The studies I have read pointed to a TAVI survival benefit in year 1, but not after year 1, and by year 5, SAVR had surpassed TAVI in terms of being lower risk. Also, when I looked into it, there was virtually no data on low risk patients, but there is one newer study since then, which I am aware of. There was a 2023 study, sponsored by Ewards Life-Sciences, the leading TAVI manufacturer, which looked at low risk patients in SAVR vs TAVI. Even though there was a 22% higher 5-year mortality for the TAVI group, the study somehow concluded: "there was no significant between-group difference in the two primary composite outcomes." It makes one wonder what it would have taken for them to conclude that there was a statistical difference. I'll let you decide if who funds such studies sometimes plays a role in how the data is interpreted. I've linked the study at the bottom of this post.
But, before you get too far down the SAVR vs TAVI road, you might ask to be referred to an interventional cardiologist specializing in TAVI, to be evaluated. When I was moderate/severe, this is exactly what my cardiologist did- his idea just so that we knew if TAVI was even on the table for me. Even though I had just completed an echo, Dr. Curtiss Stinis, one of the interventional cardiologists at Scripss who does TAVI, directed another echo for me, in which very specific measurements were focused on. As is often the case for BAV patients, it was determined that I was not likely a good candidate for TAVI, due to uneven distribution of calcium. He told me that to be more certain, we could do a CT scan. I declined, as by then I had read enough to feel that TAVI should not be done for low risk patients.
So, if you get evaluated and they determine that you are not eligible, you can further narrow your area of focus, with respect to your due diligence. Also, discuss with your cardiologist your relative risk. 72 years old would still put most people in the low risk category, but there are other factors which determine surgical risk. There is a formula to calculate patient risk and your cardiologist might be able to assess your score to determine if you are low, moderate or high risk for surgery. The higher the risk, the more TAVI is favored.
If and when your stenosis becomes severe, if you are asymptomatic, you may face another choice. Some cardiologists will wait for symptoms and will not present you with the choice and some will. This was the situation for me, as it is for many, in that when I crossed the severe threshold I was asymptomatic. My cardiologist said the choice was mine; get surgery now or watch and wait for symptoms. I chose not to wait for symptoms. If your cardiologist is of the mindset that one should wait for symptoms and not give you the choice, you should be aware that many cardiologists recognize the growing medical literature in support of not waiting for symptoms and will give you the choice.
Wishing you all the best on your journey and the choices which you may face!
Here is the study which I referenced above:
Transcatheter Aortic-Valve Replacement in Low-Risk Patients at Five Years
https://www.nejm.org/doi/full/10.1056/NEJMoa2307447