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ForumsCardiovascular OutcomesGLP-1 and atrial fibrillation risk — my results so far

GLP-1 and atrial fibrillation risk — my results so far

sarah_nash92 Thu, May 2, 2024 at 8:35 PM 8 replies 1,978 viewsPage 1 of 2
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sarah_nash92
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May 2, 2024 at 8:35 PM#1

My reason for being on this is cardiovascular rather than cosmetic, which puts me in a small minority in most of these threads.

What I am after is how much of the SELECT benefit is plausibly independent of the weight loss, and whether that distinction changes anything practical.

Numbers rather than impressions, if you have them.

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Dr.MetabolicMD
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May 2, 2024 at 8:48 PM#2
sarah_nash92 said:
My reason for being on this is cardiovascular rather than cosmetic, which puts me in a small minority in most of these threads.

SUSTAIN-6 was the first CVOT to show cardiovascular benefit with semaglutide, relevant to cardiovascular risk. In 3,297 T2DM patients with high CV risk: MACE HR 0.74 (95% CI 0.58-0.95, p=0.02)[1].

Notable: the retinopathy signal in SUSTAIN-6 (HR 1.76) was subsequently attributed to rapid A1C reduction in patients with pre-existing retinopathy — not a direct drug effect. This has been confirmed in longer-term follow-up studies.

References:
[1] Marso SP, et al. N Engl J Med. 2016;375(19):1834-1844.
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Dr.PeteFamMed
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May 2, 2024 at 9:01 PM#3
Dr.MetabolicMD said:
SUSTAIN-6 was the first CVOT to show cardiovascular benefit with semaglutide, relevant to cardiovascular risk.

I want to bring up the cardiovascular angle on cardiovascular risk.

The SELECT trial demonstrated a 20% reduction in MACE with semaglutide 2.4mg[1]. This is practice-changing because the CV benefit appears to be independent of the degree of weight loss — suggesting direct vascular and anti-inflammatory mechanisms.

For cardiovascular risk, this means we need to think beyond the primary outcome and consider the cardiovascular implications. The all-cause mortality reduction (HR 0.81) is the most clinically meaningful signal.

References:
[1] Lincoff AM, et al. N Engl J Med. 2023;389(24):2221-2232.
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tane_welly
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May 2, 2024 at 9:14 PM#4
sarah_nash92 said:
My reason for being on this is cardiovascular rather than cosmetic, which puts me in a small minority in most of these threads.

Same experience, arrived at from the opposite direction. Posting only so the count is not one.

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TrialTracker_MD
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May 2, 2024 at 10:23 PM#5

Clinical perspective, offered as context rather than as advice.

Anti-inflammatory mechanisms of GLP-1 agonists and cardiovascular risk: beyond weight loss, GLP-1R activation directly suppresses NF-κB signaling, reduces NLRP3 inflammasome activation, and decreases monocyte/macrophage adhesion to endothelium[1].

Clinical correlates: hsCRP reduction of 30-60% (consistently seen across trials), reduced carotid intima-media thickness, and decreased coronary plaque inflammation on PET imaging.

These anti-inflammatory effects likely contribute to the cardiovascular benefit seen in SELECT — and may explain benefits beyond what weight loss alone would predict.

References:
[1] Hogan AE, et al. Diabetologia. 2014;57(4):781-784.
Last edited: May 3, 2024 at 3:23 AM
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