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PCWP and venous return?

Discussion in 'Step I' started by Fox800, May 12, 2014.

  1. Fox800

    Fox800 That drug that starts with "d"... Physician 10+ Year Member

    Just curious, FA2014 on p.222 says that in distributive shock states, PCWP would be decreased while venous return would increase. I'm having trouble getting this. In my mind, increased venous return would increase LA filling pressure and therefore PCWP. More fluid returning = more pressure. What am I not understanding about this?

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  3. syma

    syma 5+ Year Member

    Apr 17, 2011
    A complete hazard guess, but you have increased venous return from the vasodilation..??
    but could it be that the increased heart rate lowers venous pressure, and ergo LA filling pressure.
    Last edited: May 12, 2014
    Fox800 likes this.
  4. CherryRedDracul

    CherryRedDracul Resident Sh!tposter Physician 5+ Year Member

    Oct 12, 2012
    North America
    And the fact that the large drop in systemic vascular resistance causes a baroreflex that increases HR and contractility (increased cardiac output) and attempts--but fails--at arterial vasoconstriction. With the heart trying to shove out as much blood out as it can, wedge pressure is expected to be low.
    Fox800 and syma like this.
  5. Fox800

    Fox800 That drug that starts with "d"... Physician 10+ Year Member

    Right on. I'll equate that to decrease ventricular filling in tachycardia.

    Thanks everyone!

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