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6 Cards in this Set
- Front
- Back
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This is described by the amount of stretch exerted on the left ventricle, the force of the stretch is created by the amount of blood that is in the left ventricle at the end of diastole, and is dependent on the amount of blood that has been returned to the right side of the heart.
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Preload
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This is the amount of pressure the left ventricle must pump against to eject blood into the systemic circulation.
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Afterload
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A normal ejection fraction would be?
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anything > 50%
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preload is similar to what?
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End Diastolic Volume (EDV)
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afterload is similar to what?
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Systemic Vascular Resistance (SVR)
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What are the 3 ways positive inotropic agents increase cardiac contraction/cardiac output ?
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1) increase calcium ions across the myocardial cell membranes
2) Increase the amounts of catecholamines in the myocardium 3) prevents the depletion of calcium ions by inhibiting phosphodiesterace enzyme which plays a part in decreasing calcium |
