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betterman74 t1_iy87x5t wrote

Turns a low pressure low volume system into a high pressure high volume system. Delivering more blood (preload) therefore hopefully (if EF preserved) increased cardiac output etc. I agree it's a bit tough sometimes to get it right in the head. Brings back days as a cardiothoracic jnr Dr.

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WebW3b OP t1_iy899cp wrote

Well yes but how does increasing blood pressure and vasoconstriction lead to increased preload? Isn’t it just receiving the same amount of blood?

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