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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

A

atria

23
Q

impulse delayed here briefly to allow ventricles to fill with blood

A

AV node

24
Q

impulse moves down through inter ventricular septum

A

bundle of his

25
Q

impulse transmitted to right and left ventricles via the right and left ____________

A

bundle branches

26
Q

impulse rapidly distributed to ventricular myocardium causing ventricular contraction

A

purkinje fibers

27
Q

normal path of conduction

A
  1. SA node
  2. AV node
  3. Bundle of his
  4. bundle branches
  5. purkinje fibers
28
Q

atrial depolarization

A

P wave

29
Q

conduction delay at AV node

A

PR interval

30
Q

ventricular depolarization

A

QRS complex

31
Q

period between ventricular depolarization and repolarization

A

ST segment

32
Q

ventricular repolarization

A

T wave

33
Q

time from beginning of ventricular depolarization to the end of repolarization

A

QT interval

34
Q

what are the formulas to calculate HR

A

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
Q

what is the electrical axis if:
lead 1: positive
lead aVF: positive

A

normal axis (0 to 90)

36
Q

what is the electrical axis if:
lead 1: negative
lead aVF: positive

A

Right axis deviation (90 to 180)

36
Q

what is the electrical axis if:
lead 1: positive
lead aVF: negative

A

Left axis deviation (-30 to -90)

37
Q

what is the electrical axis if:
lead 1: negative
lead aVF: negative

A

extreme axis (180 to -90)

38
Q

how many seconds is a small box

A

0.04 s

39
Q

how many seconds is a large box

A

0.2 s

40
Q

what is normal axis

A

down and left

41
Q

movement of positive charge

A

depolarization

42
Q
  • left ventricle hypertrophies
  • right ventricle damaged
A

left axis deviation

43
Q
  • QRS positive in I and aVF
A

normal axis

44
Q
  • right ventricle hypertrophies
  • left ventricle damaged
A

right axis deviation

45
Q
  • ectopic focus (depolarization in reverse)
A

extreme deviation

46
Q

what chest leads are mostly positive

A

V5 and V6

47
Q

what chest leads are isoelectric (transition zone)

A

V3 and V4

48
Q

what chest leads are mostly negative

A

V1 and V2

49
Q

what does right atrial enlargement show

A

big P wave in lead II and V1

50
Q

what does left atrial enlargement show

A

biphasic P wave (up and down) in lead V1
and
double humped P wave in lead II

51
Q

what does right ventricular hypertrophy show

A

Big R in V1
Big S in in V5

52
Q

what does left ventricular hypertrophy show

A

huge S in V1
huge R in V5 and V6

ECG quiz (1 decks)

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