lab 2- ekg Flashcards
(27 cards)
speed of ekg
25 mm/sec
horizontal divisions
1 mm apart, 1/25 sec = 0.04 sec
heavy dark line- horizontal
5 little squares, 1/5 sec = 0.2 sec
vertical divisions
1 mm apart, 1/10 mV= 0.1 mV
heavy dark line- vertical
5 little squares, 0.5 mV
P wave
atrial depolarization
QRS
ventricular depolarization
T wave
ventricular repolarization
arrhythmia/dysrhythmia
if either the shape, rate, pattern or absence of the waves is abnormal
time/rate
measured on horizontal line
amplitude/voltage
measured on vertical line
PR interval
beginning of P to start of Q, 0.12-0.20 sec
QRS interval
beginning of Q to end of S, 0.11 sec or less
ST segment
end of S to beginning of T
QT interval
beginning of Q to end of T
6 second method
count Rs X 10
R to R method
count little squares between two Rs, multiply by 0.04 then divide by 60
300 150 100
find R on dark line, count big boxes until next one. if in between must give range
ST interval
end of S to end of T
RA
white-always negative
LA
black- switches
LL
red- always positive
RL
green
artifact
caused by electrical depolarizations of muscular contractions
