EKG Flashcards

1
Q

normal PR interval

A

0.12-0.2 seconds

2
Q

normal QT interval

A

0.4 - 0.43 seconds

3
Q

p wave means

A

atrial depolarization

4
Q

QRS complex means

A

ventricular depolarization, ventricular conduction

5
Q

t wave means

A

ventricular repolarization

6
Q

QT interval means

A

condition of ventricals

7
Q

one small box horizontal

A

0.04 seconds

8
Q

one large horizontal box

A

0.2 seconds

9
Q

5 large boxes

A

1 second

10
Q

normal QRS duration

A

0.06 - 0.12

11
Q
A
12
Q

R-R interval

A

0.6-1 second

13
Q

HR calculation

A

count number of seconds between 2 R waves, divide 60/#

14
Q

delay in conduction from SA to AV node

A

PR interval too long or short

15
Q

when the AV node is the pacemaker, what will you see?

A

PR interval short, retrograde, hidden in QRS, or absent

16
Q

bundle branch defect will show

A

wide QRS

17
Q

delayed ventricular repolarization looks like

A

long QT

18
Q

A

V1-V6

19
Q

A

I, II, III, aVR, aVL, aVF

20
Q

normal axis deviation

A

-30 to 90 degrees

QRS axis deviation

21
Q

how to ensure proper lead placement

A

dextrocardia would be opposite

22
Q

RCA location

A

inferior

23
Q

CFX location

A

lateral

24
Q

A

anterior

25
Q

A

II, III, aVF

26
Q

A

I, aVL, V5, V6

27
Q

A

V2, V3, V4

28
Q

A

V1, V2

29
Q

A

II, III, aVF, V5, V6

30
Q

A

V2, V3, V4, V5, V6

31
Q

ischemia will show

A

t wave inversion

32
Q

injury will show

A

ST elevation

33
Q

infarction will show

A

Q wave (1/3 of R)
infarct is not old (weeks-months)

early - large, uniform, peaked T waves, then inverted T waves, then back to normal

34
Q

significant ST depression/elevation

A

one small box/1mm in 2 leads of the same area

35
Q

reciprocal changes

A

areas of ST depression opposite of ST elevation

helpful in diagnosing TRUE STEMI & ID high risk complications (poor outcomes)

common w inferior, anterior & lateral MIs

36
Q

how to determine axis

A

lead II should be most positive
verify II positive, aVR, negative

37
Q