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10 Cards in this Set
- Front
- Back
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End-diastolic volume (120ml) (4 factors)
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venous filling pressure, atrial contraction pressure, ventricular distensability, time for filling (HR)
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End-systolic volume (afterload)
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volume of blood in a ventricle at the end of contraction
main factors-pressure produced during systole and pressure in outflow area |
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Varicose vein
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pooling of blood, saphenous vein is common, trauma or gradual distension
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Factors effecting HR
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1&2 Neuronal- inhibitory or excitatory by increasing or decreasing PNS/SNS
3. bainbridge reflex- responding to IVF by increasing HR 4. baroreceptor 5. (stress)hormonal- epi, norepi |
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Bainbridge and baroreceptor reflex
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(atrial reflex) is an increase in heart rate due to an increase in CVP (fluid)
Baro- stretch pressure receptors, increase discharge to the medulla to increase PNS to decrease HR. |
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Bainbridge reflex
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(increae HR when increase CVP) also responsible for respiratory sinus arrhythmia variations in HR with breathing)Intrathoracic pressure also decreases during inspiration and thereby increases venous return to the right side of the heart
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Epinephrine effect on the heart
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cataecholamine that dilates coronary vessels and increases contractility
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norepinephrine
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catacholamine that increase RH, contractility, constricts blood vessels, sympathetic tone
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Name 2 negative inotropic agents
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decrease myocontractility and stroke volume: ETOH and propanolol
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What is the Poiseuille equation
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F = ΔP (π r 4 / 8 η l).
P-pressure r- radius n-viscosity of blood l length of vessel Increase length or viscosity pressure goes down |
