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17 Cards in this Set
- Front
- Back
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electrocardiogram
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eck ekg.. monitors electrodes attached to skin. wrist ankle chest
collect and chart electrical signals assess elect ch of heart |
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p wave
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reflects electr chg of atrial depolarilization. orig in SA nodes
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QRS complex
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electr chg assoc with ventricular depolarization
atria simuntaneously repolarizng but masked by above |
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t wave
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electr chg assoc with ventricular repolarization
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flat lines
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correspond to no electr chg
flat line between cycle is heart resting between beats |
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cardiac cycle components
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chgs within heart from one heart beat to next
systole diastole |
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systole
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contraction of heart chamber
press incr during contraction |
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diastole
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relaxation of the heart chamber
press decr during relax |
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ventricular contraction
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causes ventr press to rise
av valves pushes open force bl from ventr to arterial trunk |
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ventricular relaxation
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causes ventr press to decr
closure of semilunar valves av valves open |
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as cardiac cycle begins
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4 chambers at rest. blood returns to r and l atrium.. passive filling of ventr av valves open. atrial press over ventr press
sl valves closed. press in ventr over arterial trunk press |
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arterial systole. p wave
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atria contract ventr relax
remain bl moves atria to ventr ventr press less than atrial press av valves open ventr max bl volume. EDV end dialstolic volume |
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ventricle systole. QRS complex
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begin of ventr contract
bl moves to arterial trunks atria relax ventr press over atrial ventr press less than arterial trunk both valves closed isovolumetric contr |
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late ventr systole
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atria ventr relax
ventr over atrial press ventr over atrial trunk av opem sl valves closed amt of bl is stroke volume ventr ejection is bl ejected some bl remain ESV. end systolic volume |
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early ventr diastole
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atria ventr relax
ventr press over atrial less th as n atrial trunk av closed |
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cardiac output
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CO. amt bl pumped by a single ventricle in one min
HR heart rate. beats per min stroke volume SV. blood ejec one beat smaller heart sm stroke vol lgr stroke vol lower HR |
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contract with ekg
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SA node action potential.. signal.. cause muscle heart to depolarize and contract- induce atrial systole. P wave. flatline is PR segment. AV node bundle purkinje fibers. depolarize contract rapidly induce ventricular systole. QRS complex reps that rapid contract. atrial repolarization hidden by QRS complex. relax ventr diastole T wave.. ST segment ventr depolarized period. QT time it takes for repolar and depolar takes to occur
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