ECG Interpretation Flashcards
Chest leads on EKG
V1 and V2 are going to be down
V4 - transition from down to up…can happen earlier but shoudl NOT happen later
ECG grd paper
On block is .4 seconds…5 blocks are .2 seconds
1 block is .1 mV so 5 blocks .5 mV
25mm/sec and 10 mm/mV
How to get rate
How many QRS per box? If 1 QRS per 5 boxes, then 300/5
Irregular rate
Boxes between each QRS will change
Sinus rhythm
P wave before every QRS and QRS after every P
Where to look to determine P waves
Lead 2
SA node overdrive
Atrial foci - 60-80 BPM
Junctional foci - 40-60 BPM
Ventricular foci - 20-40 BPM
Basically, if SA node stopped working, these cells would pick up at these rates
William Morrow
V1 - W, V6- M…LBBB
V1 - M, V6 - W…RBBB
V1 bunny ears - RBBB
V5/V6 - Nose
Use V1/V6
PR interval and what it can be used to ID
Use to ID AV block (lead 2)
If prolonged but sinus, then primary
If prolonged but non-sinus then secondary
If not associated with QRS, then tertiary
QTC
T wave should hit less than halfway before the next QRS wave
Lead 2?
Which way does vector point in infarction
Away from the infarction
How to determine dquarant
Look at 1 and AVF
If 1+, then must be on pt left
If AVF positive, then must be on pt lower 1/2
LV hypertrophy findings
Tall QRS complex
Inverted T wave with long and gradual and then rapid portions
SV1 + RV5 or RV6>35 mm
ISchemia
Symmetrically inverted T wave
ST depression
Subendocardial infarction
Positive stress test
Digitalis
