EKG Flashcards
(22 cards)
Which way does the septum depolarize first?
Left to right
V1-6 are called…
Precordial leads
Septum depolarization is associated with what wave on EKG?
Q wave
A MI will change which wave on the EKG?
Q wave
Depolarization direction
Apex to base
Calculating rate (easy method)
300 150 100 75 60 50
More accurate way of calculating rate
60 sec/min / # seconds per beat
- 1 small box = .05 sec
- 1 large box (5 small boxes) = .2 sec
Hard to calculate rate for…
Extreme bradycardia
Irregular rhythms
Signs that you have sinus (normal) rhythm
P waves present and upright in lead II
P waves related to QRS complexes
Sinus arrhythmia
- signs
- can be caused by
P wave present and upright in lead II
P wave relate to QRS complex
* no standard R-R interval!
Can be caused by breathing
1st degree AV block
- sign
PR interval >.2 sec (more than 1 large block)
- PR interval is the beginning of P wave to beginning of QRS!
2nd degree AV block: Mobitz I (Wenckebach)
PR interval increases
QRS dropped
2nd degree AV block: Mobitz II
QRS dropped
No lengthening PR (PR doesn’t have to be >.2 sec)
3rd degree AV block
QRS positive then negative (called junctuonal escape beat)
RBBB
Widened QRS (>.12 seconds) Bunny ears in V1
LBBB
Widened QRS (>.12 seconds) Completely upright QRS bunny ears in V5 and V6
Atrial fibrillation
Irregularly irregular
Can feel irregularity in pulse
Atrial flutter
More regular p waves than atrial fib
Many p waves
Wandering pacemaker
Some p waves, some no p waves
Junctional (nodal) rhythm
Narrow QRS
No obvious atrial activity in lead II
Rate around 60 bpm
Ectopic / PVC
Normal then large (30-40 bpm)
Heart skipping a beat
Ventricular tachycardia
HR 150 bpm
Large downward spikes
