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Cardiology > Current of Injury > Flashcards

Current of Injury Flashcards

Thaxter

1
Q

What are the 2 main arteries of the heart?

A

Right Coronary Artery
Left Coronary Artery

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2
Q

What does the Left coronary artery divide into

A

Left Anterior Descending Branch
Left Circumflex Branch

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3
Q

What is Ischemia

A

Limited blood flow within a coronary artery

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4
Q

Define injury as it relates to the heart

A

Prolonged ischemia

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5
Q

Define Infarct

A

Complete occlusion of a coronary artery

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6
Q

Which stage of electrical conductivity is prolonged due to ishemia

A

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.

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7
Q

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

A

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

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8
Q

What occurs due to repolarization not occurring normally on ischemic tissues

A

T wave inverts

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9
Q

Ischemia is transmural means

A

existing across the entire wall of the organ

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10
Q

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

A

q wave

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11
Q

Which leads give a view of the inferior heart wall

A

Leads 2, 3 and aVF

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12
Q

Which leads give a view of the high lateral heart wall

A

Leads 1 and aVL

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13
Q

Which leads give a view of the low lateral heart wall

A

V5 AND V6

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14
Q

Which leads give a view of the anterior heart wall

A

Leads V3 AND V4

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15
Q

Which leads give a view of the septal heart wall

A

Leads v1 and V2

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16
Q

Which leads give a view of the posterior heart wall

A

Leads v1 and V2

17
Q

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

A

Left Anterior Descending Artery

18
Q

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

A

Right Coronary Artery

19
Q

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

A

Circumflex

20
Q

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

A

Posterior Descending branch of right coronary

21
Q

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

A

Septal Perforating
Posterior descending

22
Q

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

A

True

23
Q

Name the divisions of the left bundle branch

A

Septal
Anterior
Posterior Fascicles

24
Q

What is the electrical axis of the QRS complex

A

0 degrees - +90 degrees

25
Q

Define a Bundle Branch Block

A

When one or both bundle branches fail to conduct impulses

26
Q

Which stage is delayed when there is a bundle branch block

A

Depolarization stage

27
Q

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

A

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

28
Q

What occurs when you have a Right Bundle Branch Block

A

Delayed right ventricular depolarization

29
Q

What is the appearance of the graph due to a RBBB

A

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

30
Q

Name 4 causes of RBBB

A

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

31
Q

What occurs when there is a Left Bundle Branch Block

A

Delayed depolarization of the left ventricle

32
Q

What is the appearance of the graph due to a LBBB

A

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

33
Q

Name 4 causes of LBBB

A

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

Cardiology (13 decks)

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