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Question	Answer
Cellular electrophysiologists measure potentials by	measuring the inside of the cell with respect to the outside of the cell
Electrocardiographers depend on	Surface electrodes
Measurements are recorded as the ________ between two electodes	Potential difference
When the depolarizing wave approaches the positive electrode, the deflection is _______	upward
Fully Depolarized	All positive inside all negative outside
Repolarization occurs in the _________ direction	opposite
The last to depolarize is the __________ to repolarize.	first
Sequence of electrical activation and teh ECG	Endo -> Epi -> Apex -> Base
Q wave	depolariztion of the sepum
P wave	depolarization of the atria
S	Late lateral depolarization of the left base
ST segment	Full depolarization
T	repolarization
U	Late repolariztion of mid cells in myocardium
QRS	Ventrical depolarization
PR segment	time between atrial activation and ventricular activation
If conduction is slowed through the AV node, what happens to the PR interval?	Lengthens
Bundle Branch Block	Wide QRS
cardiac ion channelopathies that can lead to long _____________	QT intervals
Lead I	+ left arm - right arm
Lead II	+ Left Leg - Right arm
Lead III	+ left leg - left arm
aVF	+ left foot - Head
aVR	+ right arm
aVL	+ left arm
Downward deflection of QRS normal in lead	aVR
Horizontal plane	V1-V6
Interpretation of ECG	rate rhythm vector in frontal plane hypertorphy infarction
Rate =	(60s/min) / R-R interval
Large box =	.2 seconds
1 Large box	300 bpm
2 large box	150 bpm
3 large box	100 bpm
4 large box	75 bpm
5 large box	60 bpm
6 large box	50 bpm
LAD	I = upward aVF = Downward
Normal axis	I = upward aVF = upward
RAD	I = downward aVF = upward
Extreme RAD/LAD	I = downward aVF = downward
I	0 degrees
II	60 degrees
III	-60 degrees
avF	90 degrees
avL	-30 degrees
avR	-150 degrees
Quick and easy devation method	1. find isoelectric line 2. find vector that is perpendicular....is it up or down? 3. up is positive vector down is negative vector
Hypertrophy vector movement	vector moves toward hypertrophy
infaction vector movement	vector moves away infarction