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ForumsCardiovascular OutcomesTirzepatide cardiovascular safety — need advice

Tirzepatide cardiovascular safety — need advice

Dr.RaviCardio Thu, Mar 7, 2024 at 2:00 PM 14 replies 2,252 viewsPage 1 of 3
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Dr.RaviCardio
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Mar 7, 2024 at 2:00 PM#1

Writing this once so I can stop repeating it across threads. It is about cardiovascular outcomes, and it is deliberately narrow — everything I am not confident about is marked as such.

What is actually established

SELECT is the trial that changed the framing of this class, because it was an outcome trial rather than a weight trial: about a 20% relative reduction in major adverse cardiovascular events in people with established cardiovascular disease and overweight or obesity, without diabetes. The effect appeared earlier than the weight-loss curve can comfortably explain, which is the basis for arguing that some of the benefit is direct — anti-inflammatory and vascular — rather than purely a consequence of weight.

The condition it depends on

The qualification that SELECT enrolled a secondary-prevention population. Extrapolating a 20% relative reduction to a healthy 35-year-old with a BMI of 31 is not what that trial showed.

The practical version

Relative versus absolute is the distinction that gets lost: a 20% relative reduction on a high baseline risk is a large absolute benefit, and the same relative figure on a low baseline risk is a small one.

What I am not sure about

What would genuinely help is knowing how much of the SELECT benefit is plausibly independent of the weight loss, and whether that distinction changes anything practical. Happy to be told the question itself is wrong.

— Dr.RaviCardio · corrections welcome and will be edited into this post with credit
25 20pete_manc_UK, anna.melb_AU, mark_tokyo and 22 others
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NeuroNate
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Mar 7, 2024 at 2:09 PM#2
Dr.RaviCardio said:
SELECT is the trial that changed the framing of this class, because it was an outcome trial rather than a weight trial: about a 20% relative reduction…

True, though the ladder is longer and that is not a neutral detail — six dose steps means six opportunities to stall on the way up, and plenty of people never reach the dose the headline number came from.

24 19wendy_avl, jason_paloalto, Dr.LeslieOBGYN and 21 others
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SarahChen_PharmD
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Mar 7, 2024 at 2:18 PM#3
Dr.RaviCardio said:
SELECT is the trial that changed the framing of this class, because it was an outcome trial rather than a weight trial: about a 20% relative reduction…

This is where I part company with the consensus forming above. The "earlier than weight loss explains" argument is weaker than this thread makes it sound. Blood pressure and inflammatory markers move fast and are downstream of early weight loss, so the mechanism is not as cleanly separable as the summaries imply.

Last edited: Mar 7, 2024 at 5:18 PM
23 18paul_denver, TinaHashiRN, robert_kc and 20 others
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sophie_paris
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Mar 7, 2024 at 2:27 PM#4

Short answer first, then the reasoning. SURMOUNT-1 landed around 20.9% mean weight loss at 15mg over 72 weeks, against roughly 15% for semaglutide 2.4mg in STEP 1. Different trials, different populations, so the comparison is indicative rather than decisive — but SURPASS-2 was a genuine head-to-head and it pointed the same way.

Last edited: Mar 7, 2024 at 7:27 PM
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laura_annarbor
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Mar 7, 2024 at 3:13 PM#5
NeuroNate said:
True, though the ladder is longer and that is not a neutral detail — six dose steps means six opportunities to stall on the way up, and plenty of…

This is my experience too, for whatever a second data point is worth.

21 16JenMemphis, pat_auckland, Dr.GastroMayo and 18 others
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