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IFNy t1_iw72a3w wrote

Reply to comment by Prehensile in considering the stomach is highly vascular, does the use of blood thinners and/or beta blockers affect digestion? by Livid-Rutabaga

Beta blockers don't improve cardiac output (in fact they can worsen it in some cases). They block adrenaline receptors: adrenaline makes your heart beat faster and more vigorously, so with this drugs you have the opposite effect (slower heart rate, less powerful contractions). So the cardiac output decreases (or at least doesn't improve despite adrenaline stimulation). Cardiac output in fact depends mainly on: heart rate, blood volume and contraction

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originaljazzman t1_iw73pb6 wrote

Not to be pedantic but if someone is take a beta blocker for atrial fibrillation it will increase cardiac output despite the reduction in heart rate. Actually most people who take a beta blocker probably have an increase in CO due to higher stroke volume. Only for those who take it for sinus tachycardia would have a deceased in CO.

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SomeLettuce8 t1_iw78hwb wrote

CO = EF x HR so what you’re discussing is that they will increase EF with increased end diastolic pressures but decreased HR will ultimately shift the equation to a lower cardiac output

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Shezzanator t1_iw79lq0 wrote

CO = Stroke volume x hr. It's a fine balance. If someone is in af with fvr then stroke volume will be low because of decreased preload (as there won't be as much time for ventricles to fill) therefore slowing hr will allow more filling and increased sv and ultimately co.

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originaljazzman t1_iw7cly4 wrote

No CO = SV x HR. EF = (SV/EDV)/100. Please tell me more about how CHF patients take beta blockers to decrease the CO though /s

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yourname92 t1_iw733sy wrote

If they are used correctly they can improve cardiac output.

When you need to go on beta blockers you can have some problems with your heart not pumping correctly. High BP does not correlate to high cardiac output.

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