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N126-U3-I. MI/CHF #7
Dobrisky-Cardiac Module: Preoload & Afterload
Question | Answer |
---|---|
Preload has to do with | the volume of blood coming into the ventricles (end diastolic pressure). |
This volume will stretch the | ventricular muscle. |
When the volume and stretch are adequate the heart will | contract and move the blood to the lungs or into the systemic circulation. |
If there is too much blood volume or if the cardiac valves are not working properly, the preload needed for the cardiac cycle will be | increased. |
Define afterload | resistance the left ventricle must overcome to circulate blood into the systemic circulation. |
What affect does hypertension have on afterload and the cardiac workload | They are increased. |
What must be maintained to gain the correct preload and afterload | Balance |
If the blood volume is too low or too high how will it affect preload | Negatively |
If the resistance anywhere in the cardiac system is too high what will it cause | the heart will have to work harder to overcome the afterload. |
What is the main goal for Medications for angina and MI | to keep the heart from working too hard and going into failure. |
too much resistance to overcome increases | the preload and afterload. |
too much volume causes | an increased preload. |