1 A Cardiac- CO, Preload, Afterload
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| What is used to determine diastolic volume? EKG, EchoCardiogram, Xray? | Using ultrasound (high frequency echocardiogram)
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| Stroke Volume = ___ - ___ =___? | Stroke Volume = EDV–ESV = 135 – 65 = 70ml/beat
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| Cardiac Output-CO=___X___? | CO=HRxSV
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| HR=___beats/min? | HR= (60-100bpm)or average 72 beats/min
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| CO=___beats/min X ___ml/beat? | C.O. = avg. 72 beats/min X 70ml/beat
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| Total CO=___L/min? | CO = 5000ml/min or 5L/min
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| What is Preload? | Blood in the heart before contraction(Preload=Left Ventricular End Diastolic Volume)or the amount of stretch of the ventricle.
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| When preload is increased what happens to stroke volume? | It increases
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| What is Afterload? | The pressure that the left ventricle must overcome to eject blood to the body
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| When afterload is increased what happens to stroke volume? | It decreases. The heart is pumping against higher pressure so less blood is pumped out.
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| When afterload is decreased what happens to stroke volume? | It increases.
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