Basics of ECG Flashcards
(16 cards)
PR normal duration
0.12-0.2 sec/120-200 msec
QT interval duration
0.35-0.45
precordial leads
6 leads
v1-v6
electrodes
4 electrodes
RA,LA,RL,LL
degree of each lead
lead l=0
lead avf= +90
lead ll= +60
lead lll=+120
lead avl =-30
lead avr =-150
inferior leads
ll,lll,avf
lateral leads
l,avl,v5,v6
posterior leads
v1,v2
anterior lead
v4,v3
normal axis
(0)-(+90)
lead l+/_
lead avf +/_
Left axis deviation
0-(-90)
lead l= + _/_
lead avf= - \/
right axis deviation
+90 - 180
lead l = - \/
lead avf =+ /\
extreme axis
-90 - 180
lead l = - ( \/)
lead avf -( \/)
how to calculate normal HR in regular rhythm ECG ?
300 / R-R interval in large squares
normal HR
60-100 bpm
3-5 big squares between each R (r-r interval)
how to calculate HR in irregular rhythm
Count the number of R waves in a 20 square rhythm strip, then multiply it by 15
