Winter ECG Quiz 2

Question 0

Which leads look at the septal wall?

Answer 0

V1, V2

Question 1

Which leads are positioned to look at the inferior wall of the left ventricle?

Answer 1

II, III, AVF

Question 2

Which leads look at the anterior wall of the left ventricle?

Answer 2

V3, V4

Question 3

Which leads look at the lateral wall of the left ventricle?

Answer 3

I, aVL, v5, v6

Question 4

Which areas of the heart are perfused by the LAD?

Answer 4

Anterior wall of L. Ventricle
Lateral wall of L. Ventricle
Intraventricular septal wall

Question 5

Which areas of the heart are perfused by the LCA (left circumflex artery)?

Answer 5

Inferior wall of L. Ventricle
Lateral wall of L. Ventricle
Posterior wall of L. Ventricle
R. Ventricle

Question 6

Which areas of the heart are perfused by the R. Coronary artery?

Answer 6

Inferior wall of the L. Ventricle
Posterior wall of the L. Ventricle
R. Ventricle

Question 7

How much time does a 12-lead represent?

Answer 7

10 continuous seconds (each lead is 2.5 seconds)

Question 8

What is normal calibration of an ECG?

1mV=?mm

Answer 8

1mV=10mm

Question 9

Where is the best location on an ECG strip to locate the isoelectric line?

Answer 9

The TP segment

Question 10

In which leads will there be upright pwaves if a sinus rhythm?

Answer 10

I, II, aVF, V4, V5, V6

Question 11

Which lead will show an inverted P if it is a sinus rhythm?

Answer 11

aVR

Question 12

What is the aVR lead good for?

Answer 12

Detecting the presence of a P-wave

Question 13

Which 2 leads are best for determining whether or not it is a sinus rhythm? (P-wave)

Answer 13

Upright in II

Inverted in aVR

Question 14

What are the 3 reasons for a p-wave to NOT be inverted in aVR?

Answer 14

1. Junctional rhythm
2. Lead reversal
3. Dextrocardia (heart on the right)

Question 15

What should you do if you have upright pwaves in both aVR and II?

Answer 15

Check your leads - they are likely reversed

Question 16

What is considered “significant” elevation or depression?

Answer 16

> or = 1mm

Question 17

In addition to coronary clots, name 5 other causes of MI.

Answer 17

Coronary artery spasm
Cocaine use
Acute volume overload
Acute respiratory failure
Trauma

Question 18

What are some ECG signs of ischemia?

Answer 18

ST depression

Flipped t-wave

Question 19

What are 2 ECG signs of cardiac “injury”?

Answer 19

ST elevation

Flipped T

Question 20

What are 3 ECG findings of cardiac tissue death (infarction)?

Answer 20

ST elevation
Flipped T
Pathological Q

Question 21

What constitutes “contiguous” leads?

Answer 21

Any 2 adjacent precordial leads
Inferior: II, III, aVF
Lateral: I, aVL, V5, V6

Question 22

Right sided MI’s most often occur in conjunction with which other part of the heart? Why?

Answer 22

Inferior - their blood supply comes from the same place.

Question 23

Septal MI: which artery is involved?

Which other area of the heart is usually involved in conjunction with a septal MI?

Answer 23

LAD

Anterior

Question 24

Where will you typically see ST elevation in an anterior MI?

Answer 24

V3, V4

Question 25

What artery is involved in an anterior MI?

Answer 25

LAD

Question 26

An anterior MI almost always occurs in conjunction with what?

Answer 26

Septal or lateral MI

Question 27

A lateral MI can occur in conjunction with what other part of the heart?

Answer 27

Any part!

Question 28

A lateral MI shows ST elevation in which leads?

Answer 28

I, aVL, V5, V6

Question 29

Which artery is involved in a lateral MI?

Answer 29

LAD

Question 30

What types of t-wave abnormalities may be associated with an AMI?

Answer 30

Hyper acute | Inverted

Question 31

What defines a hyper acute t-wave?

Answer 31

>10mm in the precordial leads | >6mm in limb leads

Question 32

At what stage of a STEMI are hyper acute t-waves typically seen?

Answer 32

Early! They are commonly missed because they are short lived.

Question 33

In the presence of a STEMI, when do you typically see pathological Q waves?

Answer 33

Pathological Q waves are usually the last thing to develop. | 6 hrs after the start of an MI at the earliest

Question 34

What are the 2 areas of the heart a traditional 12-lead is not designed to view?

Answer 34

``` Right side (R. Ventricle MI) Posterior MI ```

Question 35

R. Sided MI's are rarely isolated and are most commonly associated with which type of MI?

Answer 35

Inferior MI

Question 36

What ECG findings should give a high index of suspicion for a posterior MI?

Answer 36

ST depression in V1 & V2