electrical axis and blocks Flashcards
mean QRS between what two degrees
0 and 90
anything between 90 - 90 will be + on what limb lead
one
If the mean QRS is between 0 - 180 it will be + in what augmented lead
AVF
left axis deviation is an example of what
Lead I: +
AVF: -
Right axis deviation can be seen if what
Lead I: -
AVF: +
EVERY cycle has a P wave, followed by a QRS complex, followed by a T wave. This is called what
NSR Normal sinus rhythm
Normal PR interval
3-5 small boxes
normal QRS length
<3 small boxes
NR rate
60-100
5 steps to EKG
- Regularity
Assess the regularity of the rhythm – are the cardiac cycles equal? - Rate
Calculate the ventricular rate (R to R) - P waves
Evaluate shape, size and rate (P to P) → is there a P wave before every QRS complex? - PR intervals
Normal 0.12 – 0.20 sec, 3-5 small boxes
PT interval should be constant → Does the PR interval change? - QRS complexes
Normal <0.12 sec, 3 small boxes → are the complexes narrow or wide?
Sinus pause is also called
Sinus arrest
during sinus pause what happens
no electrical impulse out of the SA node, skips a beat
how long is ok for SA pause
< 2 seconds
> 6 Concerning
sinus pause
drop a QRS > 1 beat
sinus block
Drop of 1 QRS Sa node is firing it’s just not getting out
