Medicine: ECG Findings in ACS

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NMS Medicine
Chapter 4
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1

what are the main ECG findings in ACS

ischemia
injury
infarction

2

what types of infarction can be found in ACS

subendocardial and transmural

3

what is the general evolution of MI from a normal ECG

card image

normal ECG to hyperacute T wave changes to hyperacute T waves with marked STE

then pathologic Q waves, less STE, and terminal T wave inversion

pathologic Q wave with T wave inversion

pathologic Q wave with upright T wave

4

what is the general evolution of MI from a normal ECG

card image

normal ECG to hyperacute T wave changes to hyperacute T waves with marked STE

then pathologic Q waves, less STE, and terminal T wave inversion

pathologic Q wave with T wave inversion

pathologic Q wave with upright T wave

5

what are classified as the inferior leads

II
III
aVF

6

what are classified as the lateral leads

I
aVL
V5
V6

7

what are classified as the anterior leads

V3 and V4

8

what is the left main lead

aVR

9

what are the septal leads

V1 and V2

10

what type of MI would follow in occlusion of the proximal left descending coronary artery

anterior MI

11

what type of MI would follow in occlusion of the left circumflex coronary artery

anterolateral MI

12

what type of MI would follow in occlusion of the marginal branch of the left circumflex artery

anterolateral MI

13

what type of MI would follow in occlusion of the diagonal branch of the left anterior descending artery

anterolateral MI

14

what type of MI would follow in occlusion of the right coronary artery

inferior MI

15

waht type of MI would follow in occlusion of the distal circumflex artery

posterior MI

16

what type of MI would follow in occlusion of the posterior descending artery

posterior MI

17

what type of MI would follow in occlusion of the distal right coronary arteries

posterior MI

18

if you saw Q waves and T wave inversions in I, V2, V3, and V4, what would you think was going on

anterior MI

19

if you see significant Q waves and T wave inversions in leads I, aVL, V5, and V6, what would you think was going on

anterolateral MI

20

if you saw significant Q waves and T wave inversions in II, III, aVF what would you think was going on

inferior MI

21

if you saw significant Q waves and T wave inversions in V5 and V6 what would you think was going on

inferior MI

22

what ECG lead reflects posterior electrical forces

none

23

how are posterior MIs detected on ECG

reciprocal of anterior leads: V1 with large R waves (reciprocal of posterior Q) and upright T wave (reciprocal of posterior T inversion)

24
card image

anteroseptal MI

25
card image

anterolateral MI

26
card image

anterolateral MI

27
card image

inferior MI

28
card image

inferior MI

29
card image

inferior MI

30

what would an ECG suggest if a QRS complex were prolonged and there were a terminal broad S wave in lead I and RSR complex in lead V3

RBBB

31
card image

LBBB

32
card image

RBBB


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