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15 Cards in this Set
- Front
- Back
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What are epicardial coronary vessels
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LCA and RCA
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Why do you get angina from climbing stairs?
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You attempt to get maximum coronary flow
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Where are the sources of high resistance between aorta and right atrium?
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precapillary sphincters
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Blockage of the epicardial coronary vessels (coronary stenosis) of up to 60% is compensated at rest and maximal exercise by ____________
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dilation of coronary vessels
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Which tissue has the highest oxygen consumption at rest?
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heart (8-10 ml/min/100g of tissue )
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70-80% of oxygen is extracted form the blood by the myocardium? How can the heart get more oxygen, what method is impossible?
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Increase blood flow
capillary supply myoglobin to store 02 during diastole and to release during systole Extract more oxygen from current blood flow |
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Besides large demand, why else does the heart extract so much oxygen?
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Large capillary SA
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What is LaPlace's Law?
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stress (indicator of afterload) = pr/2h
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How does the heart compensate for ventricular wall stress? What will eventually happen?
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compensatory, concentric hypertrophy
Decreases r and increase h Dilated cardiomyopathy (eccentric hypertrophy) |
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What is Fick's Equation?
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CO or CBF = VO2 / (CaO2 – CvO2)
VO2 = oxygen consumption |
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70-80% of oxygen is extracted form the blood by the myocardium? How can the heart get more oxygen, what method is impossible?
|
Increase blood flow
capillary supply myoglobin to store 02 during diastole and to release during systole Extract more oxygen from current blood flow |
|
|
Besides large demand, why else does the heart extract so much oxygen?
|
Large capillary SA
|
|
|
What is LaPlace's Law?
|
stress (indicator of afterload) = pr/2h
|
|
|
How does the heart compensate for ventricular wall stress? What will eventually happen?
|
compensatory, concentric hypertrophy
Decreases r and increase h Dilated cardiomyopathy (eccentric hypertrophy) |
|
|
What is Fick's Equation?
|
CO or CBF = VO2 / (CaO2 – CvO2)
VO2 = oxygen consumption |
