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29 Cards in this Set
- Front
- Back
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On the cardiac cycle curves, where do you point to diastasis?
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on the ventricular pressure curve
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ejection fraction?
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stroke vol / end diastolic vol
recall: EDV - ESV = stroke vol (ejection vol) |
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what is normal efection fraction?
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60%
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cardiac output?
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heart rate * stroke vol
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sympathetic burst causes what cardiac response
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incr heart rate
vasoconstriction |
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law of laplace
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larger the radius of vessel,
the greater the wall tension |
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Bainbridge reflex?
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autonomic reflex that increases the heart rate if right atrium is stretched.
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What 2 effects causes increased heart rate after stretched right atrium?
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Bainbridge reflex and
SA node stretching |
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when afterload increases, does stroke work increase?
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yes
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the adrenergic sympathetic fibers of the heart release ______
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norepinephrine
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norepinephrine interacts with ________ receptors to increase heart rate, condution velocity, and contractility
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beta adrenergic
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what keeps the heart from beating at its intrinsic SA node rate?
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parasympathetic tone
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the heart's parasympathetic fibers travel via the ____
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vagus nerve
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the heart's parasympathetic fibers release ______ neurotransmitter
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Ach
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Acetylcholine interacts with muscarinic receptors to reduce heart rate at the ____node and conduction velocity at the ______node
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SA
AV |
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too much calcium will cause the heart to _____
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spasm
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what are the effects of potassium on cardiac function?
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heart dilates,
becomes flaccid and slow, conduction at AV node can be blocked decrease in memb potential decreased intensity of action potential |
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decreased calcium has an effect on cardiac function that is similar to INCREASED _________
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potassium
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increased temperature has what effect on heart rate?
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increases HR
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intrinsic ability of heart to contract is related to the number of _________
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crossbridges
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ventricular dP/dt helps assess ventricular _______
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contractility
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most common cause of valvular lesions
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rheumatic fever
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murmur of aortic regurg
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blowing, high-pitched
diastolic |
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murmur of mitral regurg
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blowing, high pitch
systolic |
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mitral stenosis murmur
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thrill over apex
end of diastole |
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murmur of aortic stenosis
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systolic
crescendo-decrescendo |
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Murmur of PDA
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machinery, wax and wane
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4 charcs of tetralogy of fallot
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aorta in right ventricle
pulmonary artery stenosis right to left shunt (VSD) right ventricular hypertrophy |
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where is the coarctation of the aorta?
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b/w the heart and the kidneys
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