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
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