Hey, awesome videos - really appreciate them. I just had a quick question - you said that vasodilators will decrease afterload (due to arterial dilation), and also decrease preload (due to decreased venous pressure). So wouldn't the decreased preload shift the cardiac function graph downwards instead of upwards? Or does the increase in blood volume due to increased stroke volume negate the decreased venous pressure and thus there is still increased preload despite the dilation of veins?
So an arterial vasodilater (such as hydrALazine) affect mainly Arteries.. so dilating the arteries means less resistance for heart to pump against = decrease Afterload and there will be more blood being pumped back to heart, which is why the graph moves up. ( Only mistake on that last graph was that the lines would still end on the same Mean system pressure. ) A Venous vasodilator such as NO, would affect the Veins mostly, therefore affect the Preload.
Thank you for making it so easy! I was pulling my hair out just trying to understand FA and get thru it. I think I was even contemplating how many questions I would get wrong if I just skipped CVS physio. Lol
This is pure Genius! My goodness, I never got this concept until now! Wow!! Thank you so very much for explaining the Frank Sterling Curve and Venous Return graph. Excellent!
