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14 Cards in this Set
- Front
- Back
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What are the factors that affect preload?
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fill time
compliance pressure atrial systole pericardial constraint |
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what is the gist of the Frank Starling curve?
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as you increase EDV, you increase the force of contraction.
sarcomeres get longer |
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if contractility is held constant, at what HR is CO negatively affected?
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>150 bpm
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what is compliance?
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the ability of the ventricle to distend.
its elasticity |
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when is compliance reduced?
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hypertrophy
ischemia |
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what factors have an effect on ventricular filling pressure?
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Central venous pressure
intrathoracic pressure |
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when is atrial systole (atrial kick) important?
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during reduced filling times
I.E. exercise |
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When does pericardial constraint become a negative thing?
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when fluid accumulates around the heart
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What is cardiac tamponade?
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fluid accumulation around the heart
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what is afterload?
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resistance against ventricular contraction
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what are the main components of LV afterload?
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arterial pressure
vessel compliance peripheral vascular resistance viscosity mass of the column of blood in aorta |
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how do you estimate the mean arterial pressure (MAP)?
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MAP= ESV + 1/3 PP
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what is "afterload compensation"?
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if the afterload increases, the EDV will increase to compensate for the increased ESV. This allows the SV to stay the same
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what does "afterload compensation" do to LVSW?
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the stroke work is increased
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