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ECG quiz > ECG > Flashcards

ECG Flashcards

1
Q

what are the limb leads

A

1,2,3, aVR, aVL, aVF

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2
Q

what are the chest leads

A

V1, V2, V3, V4, V5, V6

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3
Q

what leads are for the lateral wall of the left ventricle (limb leads)

A

lead 1 and aVL

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4
Q

what leads are for the inferior wall of the heart

A

lead 2,3, aVF

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5
Q

what leads are for the anterior and septal walls of the left ventricle

A

leads V1-V4

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6
Q

what leads are for the lateral wall of the left ventricle (chest leads)

A

leads V5 and V6

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7
Q

what artery supplies anterior wall, septal wall, part of lateral wall of left ventricle

A

left anterior descending (LAD) artery

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8
Q

what artery correlates with lead V1-V4

A

left anterior descending (LAD) artery

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9
Q

what artery correlates with anterior wall infarction

A

left anterior descending (LAD) artery

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10
Q

what artery supplies inferior wall and part of posterior wall of left ventricle

A

right coronary artery (RCA)

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11
Q

what artery correlates with leads 2, 3, aVF

A

right coronary artery (RCA)

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12
Q

what artery correlates with inferior wall infarction

A

right coronary artery (RCA)

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13
Q

what artery supplies lateral wall of left ventricle

A

left circumflex (Lcx) artery

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14
Q

what artery correlates with leads 1, aVL, V5, V6

A

left circumflex (Lcx) artery

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15
Q

what artery causes lateral wall infarction

A

left circumflex (Lcx) artery

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16
Q

what could cause ST elevation in leads V1-V4

A

anterior wall MI (LAD artery)

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17
Q

what could cause ST elevation in leads 2,3, aVF

A

inferior wall MI (RCA)

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18
Q

what could cause ST elevation in leads 1, aVL, V5, V6

A

lateral wall MI (Lcx)

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19
Q

what could cause ST depression. in leads 1, aVL

A

ischemia in inferior wall

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20
Q

what could cause deep Q waves

A

necrosis

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21
Q

initiates the electrical impulse in the right atrium

A

SA node

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22
Q

the impulse spreads through this, causing atrial contraction

23
Q

impulse delayed here briefly to allow ventricles to fill with blood

24
Q

impulse moves down through inter ventricular septum

A

bundle of his

25
impulse transmitted to right and left ventricles via the right and left ____________
bundle branches
26
impulse rapidly distributed to ventricular myocardium causing ventricular contraction
purkinje fibers
27
normal path of conduction
1. SA node 2. AV node 3. Bundle of his 4. bundle branches 5. purkinje fibers
28
atrial depolarization
P wave
29
conduction delay at AV node
PR interval
30
ventricular depolarization
QRS complex
31
period between ventricular depolarization and repolarization
ST segment
32
ventricular repolarization
T wave
33
time from beginning of ventricular depolarization to the end of repolarization
QT interval
34
what are the formulas to calculate HR
# of QRS complexes x 6 300 / (# of large squares between R-R waves) --> best seen in lead II or number of QRS complexes x 6
35
what is the electrical axis if: lead 1: positive lead aVF: positive
normal axis (0 to 90)
36
what is the electrical axis if: lead 1: negative lead aVF: positive
Right axis deviation (90 to 180)
36
what is the electrical axis if: lead 1: positive lead aVF: negative
Left axis deviation (-30 to -90)
37
what is the electrical axis if: lead 1: negative lead aVF: negative
extreme axis (180 to -90)
38
how many seconds is a small box
0.04 s
39
how many seconds is a large box
0.2 s
40
what is normal axis
down and left
41
movement of positive charge
depolarization
42
- left ventricle hypertrophies - right ventricle damaged
left axis deviation
43
- QRS positive in I and aVF
normal axis
44
- right ventricle hypertrophies - left ventricle damaged
right axis deviation
45
- ectopic focus (depolarization in reverse)
extreme deviation
46
what chest leads are mostly positive
V5 and V6
47
what chest leads are isoelectric (transition zone)
V3 and V4
48
what chest leads are mostly negative
V1 and V2
49
what does right atrial enlargement show
big P wave in lead II and V1
50
what does left atrial enlargement show
biphasic P wave (up and down) in lead V1 and double humped P wave in lead II
51
what does right ventricular hypertrophy show
Big R in V1 Big S in in V5
52
what does left ventricular hypertrophy show
huge S in V1 huge R in V5 and V6

ECG quiz (1 decks)

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