27. Introduction to the 12-lead ECG Interpretation Flashcards Preview

CVPR Exam I > 27. Introduction to the 12-lead ECG Interpretation > Flashcards

Flashcards in 27. Introduction to the 12-lead ECG Interpretation Deck (70):
1

What does an ST elevation indicate?

an MI in progress (acute)

2

In ____, a large Q wave means an MI (necrosis, infarct).

lead III

3

How will a right bundle branch block (RBBB) look on V1?

widened QRS that is upright/positive

3

LVH will have highly positive R waves and a negative T wave in leads _____.

V4, V5, and V6

4

Lead II is a bipolar lead that is _____ in the L leg and _____ in the R arm.

positive; negative

4

In lead III, the Q wave should be _____ in a normal ECG.

very small if not absent

4

If an acute infarct shows up on leads V1 or V2, it's located in the ____ of the heart.

anteroseptal wall

5

In lead III, a large Q wave means _____.

an MI (necrosis, infarct)

5

The site of an acute MI is where the ____ shows up on ECG.

ST elevation

7

Everything is _____ in aVr.

negative

7

Each mm of the read paper is equal to ____ mV.

1

9

Lead 1 is a bipolar lead that is _____ in the right arm and ____ in the left arm.

negative; positive

10

A very positive and wide QRS that may have bunny ears, and a large negative T wave on V6 indicates what?

a LBBB

10

_____ will have highly positive R waves and a negative T wave in leads V4, V5, and V6.

LVH

11

What is aVf?

the unipolar lead headed straight down the body

12

Lead III is a bipolar positive in the _____ and negative in the _____.

right leg; left arm

13

If an acute infarct shows up on leads _____, it's located in the anterior wall of the heart.

V3 or V4

14

What is "large" for a Q wave? Where do you need to see it for it to be diagnostic?

greater than 25% of the R wave and 1 box wide; in 2 contiguous leads

14

If an acute infarct shows up on leads V3 or V4, it's located in the ____ of the heart.

anterior wall

15

What does RA enlargement look like on lead II?

it has an early positive spike that's taller than normal and dips slightly when the LA depolarizes

16

A widened QRS that is downwards/negative in V1 is indicative of?

a left bundle branch block (LBBB)

17

What does LA enlargement look like on lead II?

it has a late positive spike that's taller than normal after growing slightly taller post RA-depolarization

17

If there are positive ST elevations in every lead but aVr, it's not a bunch of MIs, it's _____.

acute pericarditis

18

What lead should you check the P wave with?

lead II

18

Which are the L sided leads?

V4, 5, and 6

18

A _____ means the infarct is acute but a _____ means it is an old MI.

ST elevation; Q wave

20

What is aVL?

the unipolar lead on the L arm

21

Lead I is a bipolar lead that is negative in the _____ and positive in the ______.

right arm; left arm

22

How will a left bundle branch block (RBBB) look on V1?

a widened QRS that is downwards/negative

22

Hemiblocks cause ______ without _____.

axis shifts; widening the QRS

24

Which is the unipolar lead on the L arm?

aVL

25

What is aVr?

the lead on the R arm

26

What does a bundle branch block do to the ventricular depolarization?

whichever branch is blocked, that side of the heart has to wait for the depol to go all the way around the other side of the heart first, so there will be a delay of depol on the affected side

27

If the P wave goes in the opposite direction of the R wave, this is abnormal and means ____ or ____.

hypertrophy; ischemia

28

To remember R vs L BBB QRS direction: - when you drive a car, to turn RIGHT you flick the turn signal UPWARDS. To turn LEFT, you hit the turn signal DOWNWARDS.

for your learning pleasure only!

30

Lead III is a bipolar lead that is _____ in the R leg and ______ in the left arm.

positive; negative

31

If an acute infarct shows up on leads _____, it's located in the anterolateral wall of the heart.

V5 or V6

32

Hypertrophy causes increased mass which causes ____ on the ECG.

increased voltage

33

LVH will have highly positive ____ waves and a negative ___ wave in leads V4, V5, and V6.

R; T

34

Each large box = _____.

0.2 sec

36

The PR interval starts at _____ and ends at _____.

the beginning of the p-wave; the beginning of the QRS

37

LVH will have very high voltage R waves in the _____ leads.

left sided

38

If an acute infarct shows up on leads V5 or V6, it's located in the ____ of the heart.

anterolateral wall

39

When will the QRS's be opposite in lead I versus lead II on the same ECG?

in hemiblocks

40

A widened QRS that is upright/positive in V1 is indicative of?

a right bundle branch block (RBBB)

41

What pathology masks an infarct?

a LBBB

42

If an acute infarct shows up on leads _____, it's located in the inferior wall of the heart.

II, III, or aVf

44

The QT interval starts at ______ and ends at ____.

the beginning of the QRS; the end of the T wave

46

If you start at V1 and move towards V6, you are moving from the _____ to the _____.

R ventricle; apex of the heart

47

V1 and V2 will show a very tall, narrow QRS in ____.

RVH

48

Which is the unipolar lead on the R arm?

aVr

49

In which leads will the R wave be very highly positive in RVH?

V1 and V2

50

Each small box = ____.

0.04 sec

51

In lead III, the ____ should be very small if not absent in a normal ECG.

Q wave

52

If an acute infarct shows up on leads II, III, or aVf, it's located in the ____ of the heart.

inferior wall

53

If an acute infarct shows up on leads _____, it's located in the anteroseptal wall of the heart.

V1 or V2

55

In lead ___, the Q wave should be very small if not absent in a normal ECG.

III

57

What is the standard for wide QRS (time and # of boxes)?

more than 0.12 sec or 3 small boxes

58

On V6 in a LBBB, you will see _____.

a very positive and wide QRS that may have bunny ears, and a large negative T wave

59

Everything is _____ in aVf.

positive

61

Lead II is a bipolar lead that is positive in the _____ and negative in the _____.

left leg; right arm

62

Normal, V5 and V6 should have ____ T waves with ____ S-T segments.

upright; flat

63

In lead III, a large ____ means an MI (necrosis, infarct).

Q wave

64

Which hemiblock is most common?

anterior

65

If you start at lead ____ and move towards lead ____, you are moving from the R ventricle to the apex of the heart.

V1; V6

66

If there are _____ in every lead but aVr, it's not a bunch of MIs, it's acute pericarditis.

positive ST elevations

67

The PR interval should be less than _____.

0.2 seconds

68

aVr look at which part of the heart?

the right side

69

A LBBB can mask an _____.

infarct

70

Which is the unipolar lead headed straight down the body?

aVf