Current of Injury

Question 1

What are the 2 main arteries of the heart?

Answer 1

Right Coronary Artery
Left Coronary Artery

Question 2

What does the Left coronary artery divide into

Answer 2

Left Anterior Descending Branch
Left Circumflex Branch

Question 3

What is Ischemia

Answer 3

Limited blood flow within a coronary artery

Question 4

Define injury as it relates to the heart

Answer 4

Prolonged ischemia

Question 5

Define Infarct

Answer 5

Complete occlusion of a coronary artery

Question 6

Which stage of electrical conductivity is prolonged due to ishemia

Answer 6

Depolarization is prolonged because ischemia leads to hypoxia of the myocardium and this decreases ATP. ATP is needed for the Na/K pump to pump Na out of the cell .
Due to this not happening the next depolarization is prolonged.

Question 7

Which tissue is most affected by ischemia and what is its significance to the ECG graph

Answer 7

Subendocardial tissue most affected.
Represented by ST depression or ST inversion

Question 8

What occurs due to repolarization not occurring normally on ischemic tissues

Answer 8

T wave inverts

Question 9

Ischemia is transmural means

Answer 9

existing across the entire wall of the organ

Question 10

When there is the death of tissue which wave is sometimes seen see

Answer 10

q wave

Question 11

Which leads give a view of the inferior heart wall

Answer 11

Leads 2, 3 and aVF

Question 12

Which leads give a view of the high lateral heart wall

Answer 12

Leads 1 and aVL

Question 13

Which leads give a view of the low lateral heart wall

Answer 13

V5 AND V6

Question 14

Which leads give a view of the anterior heart wall

Answer 14

Leads V3 AND V4

Question 15

Which leads give a view of the septal heart wall

Answer 15

Leads v1 and V2

Question 16

Which leads give a view of the posterior heart wall

Answer 16

Leads v1 and V2

Question 17

Which artery is blocked when there is an infarct in the anterior region of the heart

Answer 17

Left Anterior Descending Artery

Question 18

Which artery is blocked when there is an infarct in the inferior region of the heart

Answer 18

Right Coronary Artery

Question 19

Which artery is blocked when there is an infarct in the lateral region of the heart

Answer 19

Circumflex

Question 20

Which artery is blocked when there is an infarct in the posterior region of the heart

Answer 20

Posterior Descending branch of right coronary

Question 21

Which artery is blocked when there is an infarct in the septal region of the heart

Answer 21

Septal Perforating
Posterior descending

Question 22

Bundle of His divides into Left and Right Bundle Branches . True or False?

Answer 22

True

Question 23

Name the divisions of the left bundle branch

Answer 23

Septal
Anterior
Posterior Fascicles

Question 24

What is the electrical axis of the QRS complex

Answer 24

0 degrees - +90 degrees

Question 25

Define a Bundle Branch Block

Answer 25

When one or both bundle branches fail to conduct impulses

Question 26

Which stage is delayed when there is a bundle branch block

Answer 26

Depolarization stage

Question 27

What are the characteristics of the QRS complex when there is a bundle branch block

Answer 27

0.12 seconds or greater They may be notched, Slurred M shape in the chest leads

Question 28

What occurs when you have a Right Bundle Branch Block

Answer 28

Delayed right ventricular depolarization

Question 29

What is the appearance of the graph due to a RBBB

Answer 29

Notched QRS in leads v1 and v2 Slurred S waves in leads 1, v5 and v6

Question 30

Name 4 causes of RBBB

Answer 30

Anterior wall myocardial infarction Coronary artery disease Hypertension Scar tissue that develops after surgery

Question 31

What occurs when there is a Left Bundle Branch Block

Answer 31

Delayed depolarization of the left ventricle

Question 32

What is the appearance of the graph due to a LBBB

Answer 32

Wide, tall notched or slurred QRS in leads v5 and v6 Wide, largely negative rS complex or entirely negative QS in v1 and v2

Question 33

Name 4 causes of LBBB

Answer 33

Anterior wall myocardial infarction Hypertensive heart disease Aortic Stenosis Degenerative changes of the conduction system or cardiomyopathy