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NBME Answers

free120/Block 1/Question#11

A 26-year-old man is brought to the emergency ...

Arterial baroreceptor firing rate: decreased;
Systemic vascular resistance: increased;
Pulmonary vascular resistance: increased;
Systemic capillary fluid transfer: absorption

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The baroreceptors are stretch receptors (the more fluid in the vessel, the more they fire). So a patient with hemorrhagic shock will see a decrease in the baroreceptor firing rate. Activation of RAAS will result in increased vascular resistance (vasoconstriction) in order to maintain blood pressure. And capillaries, such as those in the kidney, will be primed for resorption and not filtration (no one wants to pee out good dilute urine when they’re dehydrated). Likewise, systemic capillaries will prefer to hold onto plasma and not let it leak into the interstitium (third-spacing).

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submitted by anu(2),

what about the increase in pulmonary vascular resistance ? doesnt PCWP fall in hemorraghic shock