14. Cardiac Output and Contractility Flashcards

1
Q

What does decreasing afterload do to the velocity of ventricular contraction?

A

Increases velocity

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2
Q

What is the equation for stroke volume?

A

SV = End Diastolic Volume - End Systolic Volume

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3
Q

What is the equation for ejection fraction

A

Ejection Fraction % = Stroke Volume / End Diastolic Volume

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4
Q

What is the equation for cardiac output?

A

Cardiac Output = Stroke Volume * Heart Rate

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5
Q

What is the normal ejection fraction?

A

55%

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6
Q

What would and increase in preload do to the stroke volume?

A

Increased preload increases stroke volume

(Frank-Starling principle)

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7
Q

What does an increase in afterload reduce in terms of the pressure / volume loop?

A

Stroke volume

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8
Q

What does an increased chronotropic effect do to contractility, assuming the ventricles have time to fill?

A

Increases contractility

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