Course QUESTIONS WITH |\ |\ |\
ANSWERS
blood flow from body through the heart
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superior and inferior vena cava > right atrium > tricuspid valve
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> right ventricle > pulmonic valve > pulmonary artery > lungs >
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pulmonary veins > left atrium > mitral valve > left ventricle >
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aortic valve > aorta > body
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SA node bpm
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60-100
AV node bpm
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40-60
purkinje fibers bpm |\ |\
20-40
ekg paper: small square = ________ second
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0.04
ekg paper: small square = _____ mm
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1
ekg paper: larger square = ________ second
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0.20
ekg paper: larger square = ______ mm
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5
, how is voltage measured on an ekg strip?
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along the vertical axis; 10 mm is 1 MV
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15 larger boxes is how many seconds?
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3
30 larger boxes is how many seconds?
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6
what does the P wave show? |\ |\ |\ |\ |\
atrial depolarization (contraction); indicates the impulse
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originated in the SA node, atria, or AV junction |\ |\ |\ |\ |\ |\ |\ |\
P wave characteristics
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1st waveform on tracing, normally smooth and rounded, upright
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in lead 2, precedes QRS
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PR interval |\
0.12-0.20 seconds measured from beginning of P to beginning of
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QRS
what does a PR interval longer than 0.20 imply?
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heart block |\
what does the QRS complex show?
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ventricular depolarization and atrial repolarization |\ |\ |\ |\
what is bundle branch block? |\ |\ |\ |\
obstruction in one of the branches of the bundle of his so the |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
QRS is wider and more than 0.12 seconds
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nurse actions for a bundle branch block
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place patient on oxygen, call the physician, call rapid response if
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needed, obtain an EKG to determine if left or right
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QRS characteristics |\