Mechanical Activity Of The Heart Flashcards
Define inotrope.
What effect does an inotrope have on cardiac muscle contraction?
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Differentiate inotropy from the length-tension relationship
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Describe the cause and timing of the 4 heart sounds
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Predict cause and effect of altered heart sounds
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Predict changes in cardiac performance and associated pathologies with insufficient or stenotic valves
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During which stage of the cardiac cycle is ventricular pressure falling and all valves are closed?
Isovolumic Relaxation
What would happen to stroke volume if ESV got larger?
Lower
An incompetent mitral valve would allow blood to flow from the ___?
Left Ventricle to the Left Atria
What does it mean to say that blood is noncompressible?
Compression will raise pressure and will not affect volume
What does it mean to say that the heart is compliant?
It is stretchy - it stretches and accommodates when blood fills (increase pressure and volume)
What gradient will fluid (blood) move according to?
When will flow stop?
Pressure gradient (high to low) Stops when pressure is equalized
What is isovolumic relaxation?
When do you see this in the cardiac cycle?
Pressure drops with no change in volume
Occurs during diastole - period of relaxation and filling with blood (rapid filling followed by reduced filling)
What is isovolumic contraction?
When do you see this in the cardiac cycle?
Pressure rises with no change in volume
Occurs during systole - period of force generation (rapid ejection followed by reduced)
