Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

kine 4600- EKG > Ch. 9: Infarction > Flashcards

Ch. 9: Infarction Flashcards

1
Q

what is an infarction?

A
  • complete occlusion of coronary artery
  • necrosis
  • no depolarization
  • no contraction
  • heart gets blood supply from coronary arteries
  • blockage= myocardium has no blood supply
  • PRIMARILY LEFT VENTRICLE
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

how are infarctions diagnosed?

A
  • history and physical exams
  • cardiac enzymes
  • EKG
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

how will an EKG possibly show an infarction?

A
  • which coronary artery is blocked
  • reveal conduction blocks caused by infarction
  • reveal reduced blood supply to heart
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

what is the same as an infarction?

A
  • myocardial infarction
  • coronary occlusion
  • heart attack
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

what is necrotic tissue?

A
  • functionally dead
  • no depolarization
  • may compromise hemodynamics
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

what is the Infarction Triad?

A
  • Ischemia (lack of blood flow)
  • Injury (to heart tissue)
  • Necrosis (dead tissue)
  • basis for recognizing and diagnosing MI
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What is Ischemia?

A
  • lack of blood flow
  • Pathological
  • may cause enigma
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

How do you identify Ischemia?

A
  • Inverted T wave in absence of MI
  • inverted T wave and symmetrical
  • T wave inversion V2-V6
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Injury

A
  • acuteness of infarction
  • ST seg elevation
  • may be slight
  • may be >10mm
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

ST elevation

A
  • alone may indicate infarction
  • acute
  • over time ST elevation returns to baseline
  • Ventricular aneurysm may cause persistent ST elevation in most chest leads
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

ST depression

A
  • subendocardial infarction
  • positive stress test
  • digitalis
  • angina attack
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

When does ST depression occur?

A
  • with ischema
  • ventricular strain
  • electrolyte abnormality
  • subendocardial infarction
  • elevated rate
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

J Point (Junctional Point)

A
  • end of QRS and beg. of ST set
  • elevation is common in young, healthy indivs
  • measure ST seg depression 80 sec past J point
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Subendocardial Infarction

A
  • ST depression
  • Flat, Horizontal, Downward sloping
  • Non Q wave infarction
  • small area just beneath endocardial lining
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Necrosis

A
  • Q wave
  • significant
  • at least 0.04s in duration
  • at least 1/3 of QRS amp
  • height and depth
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

How to identify infarctions

A
  • scan all leads except QVR for:
  • Q waves
  • ST seg depression or elevation
  • inverted T waves
17
Q

Anterior Infarction

A
  • positive chest leads record negative
  • V1-V4
  • Q wave
  • anterior descending art
18
Q

Lateral Infarction

A
  • positive L arm leads record negative
  • Lead 1 and AVL
  • Q wave
  • occlusion of circumflex art
19
Q

Inferior Infarction

A
  • Positive L arm leads record negative
  • Leads 2, 3, and AVF
  • Q wave
  • terminal branch of either R/L CA
20
Q

Posterior Infarction

A
  • ST depression
  • V1 and V2
  • Large/Tall R waves
  • may be Q in V6
  • R coronary art
21
Q

Coronary arteries

A
  • L coronary artery: Circumflex and Anterior Descending
  • R coronary artery
22
Q

Left ventricle (lateral)

A
  • Q wave
  • Lead 1
  • AVL
23
Q

Left ventricle (anterior)

A
  • Q wave
  • V1
  • V2
  • V3
  • V4
24
Q

Antero-septal (septum)

A
  • Q waves
  • V1
  • V2
    (negative QRS in V1-V4, V5-V6 norm have insignif Q waves)
25
Q

Antero-lateral

A
  • Q waves
  • V3
  • V4
    (negative QRS in V1-V4, V5-V6 norm have insignif Q waves)
25
Q

Antero-lateral

A
  • Q waves
  • V3
  • V4
26
Q

T/F: anterior infarctions are very deadly

A

T: widow maker. immediate treatment improves survival

27
Q

Lateral Infarct

A
  • depolarization away from positive leads
  • Lateral L ventricle involved
  • Q wave
  • Lead 1
  • AVL
28
Q

Inferior infarction

A
  • depolarization away from positive leads
  • 2, 3, AVF negative sometimes
  • inferior wall of L ventricle involved
  • Q wave
  • Lead 2
  • Lead 3
  • AVF
29
Q

Acute Anterior infarction

A
  • V1-V4 still negative
  • ST elevation
  • significant Q waves
  • V1
  • V2
  • w/ possible significant Q waves in V1 and V2
30
Q

Acute posterior infarct

A
  • ST depression
  • same as posterior infarct, difficult to diagnose on EKG
  • Large R wave
  • V1
  • V2
31
Q

Hemiblock

A
  • Leads to MI, hard to identify on EKG
  • associated with decreased blood supply
  • LBB- 2 divisions
  • anterior and posterior
32
Q

Hemiblock (anterior)

A
  • LAD
  • normal or slightly widened QRS
  • Large Q wave in lead 1
  • Large S wave in Lead 3
  • occluded anterior descending coronary art
  • anterior infarction (1/2 develop anterior hemiblock)
33
Q

Posterior hemiblock

A
  • RAD
  • normal or slightly widened QRS
  • Large S wave in Lead 1
  • Large Q wave in Lead 3

kine 4600- EKG (8 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2025 Bold Learning Solutions. Terms and Conditions