cardiac cycle figure in first aid pg 283(2012)

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tarsuc

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So in page 283 of FA 2012,

the first figure has 3 colored (orange,green and blue) scenarios given which may change the cardiac cycle (increased contractility, preload and afterload respectively).

I had a question on whether the orange line is incorrectly drawn to coincide with the green line to the right of the graph.

Why should increased contractility lead to incresed preload?

Is that basic? forgive me :):eek:

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increased preload leads to increased contractility via the starling mechanism not the other way around.
Thanks for your reply.

So if the orange line where to represent effect of digoxin(increases contractility alone), then the figure in first aid would be wrong! right?
 
I wish i had renamed this thread to potential first aid error! :)
someone ought to have replied then.
 

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