Obstructive Shock - Preload Effects

[Vivienne]

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On page 292 of FA 2016 there's a table on shock that says obstructive shock (eg pulmonary embolism) results increased preload. Does anyone understand why that would be?

 

[AZ7]

In that table, double arrows indicates the primary insult/hemodynamic change. So in Obstructive shock the primary change is decreased CO. The resulting decreased blood supply causes a reflex stimulation of the sympathetic system to increase perfusion of tissues. This results in vasoconstriction of both arteries (after load increases) and veins ( preload increases ).