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12 Cards in this Set
- Front
- Back
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Frank-Starling curve
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******
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what does the curve show?
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the relationship between myocardial work and preload: the force of a muscle is related to the length and stretch placed upon it, up to a point, after which force declines as stretch becomes more pronounced
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what is on the x axis?
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preload, as shown by LV filling pressure
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Y?
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work (SV)
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besides LVFP, what are the other parameters of preload?
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end diastolic volume and pressure, and PA wedge pressure
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the Y axis is cardiac work as represented by SV, what are the other parameters of cardiac work?
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CO, LV stroke work, and blood pressure
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what do curves shifted down and to the left indicate?
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decreased contractility, for example due to MI, CHF
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up and the the left?
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improved ventricular performance
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what happens in general as SVR increases?
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cardiac work decreases and the curve moves down and right
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what happens from 1 to 2?
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ventricular performance and inotropicity are improved, and preload is a little decreased due to the increased CO, due t agents such as EPI, Dopamine, dobutamine
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1 to 3
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ventricular performance is improved and preload is significantly decreased, this will be due to a combo of an inotrope and vasodilator like nitroglycerine
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1 to 4
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ventricular performance doesnt change significantly, but there is decreased filling (so its more favorable), due to preload reducation from a vasodilator like nitro
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