ECG p.74-92

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contraction 2 things
- depolarization
- systole
rest/relaxation 2 things
- repolarization
- diastole
decrease in oxygen due to decreased blood flow - 2
- ischemia or
- oxygen debt/lack
intense chest pain - 2
- brief ischemia
- aka angina
myocardial infarction (MI) - 2
- severe ischemia
- heart dies from hypoxia (no oxygen)
heart's 1st sound (lub) - 2 things
- ventricular contraction/depolarization/systole
- tricuspid & bicuspid valves closing
- afterload=squeeze=resistance to ejecting blood
heart's 2nd sound - 2
- ventricular relaxation/repolarization/diastole
- pulmonic & aortic valves closing
- preload=stretch=volume returning to the heart
volume of blood pumped out of 1 ventricle in a single beat/contraction

stroke volume
amount of blood pumped by the left ventricle in 1 minute

cardiac output
pressure in the ventricles at the end of a diastole
- preload
- end-diastolic pressure
resistance against which the heart much pump

afterload
2 things determine peripheral vascular resistance (PVR)
- vasoconstriction
- vasodilation
involuntary
not under conscious control

autonomic nervous system (ANS)
physical activity
fight or flight
innervates blood vessels

sympathetic nervous system (SNS)
rest and digest

parasympathetic nervous system (PNS)
my responsibility to make sure ____ ____ not used before doing a stress test

beta-blocker meds
generate the physical contraction of the myocardium

myocardial working cells
primary functions include both contraction & relaxation

myocardial working cells
do not contain contractile filaments

pacemaker cells
control the rate & rhythm of the heart by coordinating regular depolarization

pacemaker cells
point at which a stimulus will produce a cell response

threshold
GENERATE own electrical impulses spontaneously w/o external stimulation

automaticity
RESPOND TO an electrical stimulus

excitability/irritability
RECEIVE & TRANSMIT an electrical stimulus

conductivity
SHORTEN & EXTEND in response to an electrical stimulus

contractility/rhythmicity
mechanical function of the heart

contractility
major function in cardiac depolarization & repolarization
- potassium
- K
K increase in blood

hyperkalemia
K deficit in blood

hypokalemia
vital part in depolarization of myocardium
- sodium
- Na
Na increase in blood

hypernatremia
Na deficit in blood

hyponatremia
important function in myocardial depolarization & myocardial contraction
- calcium
- Ca
Ca increase in blood

hypercalcemia
Ca deficit in blood

hypocalcemia

Author

PopeJim

270781

Card Set

ECG p.74-92

Description

Coronary circulation, heart sounds, cardiac cycle, cardiac electrical information

Updated

2014-04-16T21:57:51Z

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