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