conflicting information about the effect of beta blockers on preload

[coffeesnob]

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FA 2014 says beta blockers raised EDV (preload) on page 299. But FA 2015 says beta blockers have no effects or decrease EDV on page 305.

I thought beta blockers raised preload by slowing the HR and giving the heart more time to dilate and by decreasing contractility. Which one is correct?

Thanks!

 

[seminoma]

It does make sense that BB will lower EDV by the mechanism you mention, but at the same time I suppose they could actually decrease EDV by upregulating (over time) B1 receptors (their main mechanism when used in HF).

I'm not really sure, but I think it could be errata or not depending on how you look at it.