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Flashcards in ECG Deck (62)
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1

pacemaker rate at the SA node

60-100

2

pacemaker rate @ AV node

40-55

3

pacemaker rate @ bundle of His, bundle branches, purkinje fibers

25-40

4

normal P wave duration

0.06-0.11

5

normal QRS complex duration

0.07-0.11

6

normal PR interval duration

0.12-0.2

7

ventricular myocyte repolarization (phase 3)

T wave

8

the entire action potential for the ventricular myocytes (depolarization- plateau- repolarization)

QT interval

9

ventricular myocyte plateau phase (phase 2)

ST segment

10

ECG interpretation - top 4 questions

1. are there P waves?
2. is there a P wave following every QRS?
3. what is pacing the heart?
4. what does each deflection look like?

11

axis: 0 degrees

lead I

12

axis: 60 degrees

lead II

13

axis: 120 degrees

lead III

14

axis: -30 degrees

avL

15

axis: 90 degrees

avF

16

axis: -150 degrees

avR

17

precordial lead placement: right 4th interspace, adjacent to sternum

V1

18

precordial lead placement: left 4th interspace adjacent to the sternum

V2

19

precordial lead placement: positioned halfway between V2 and V4

V3

20

precordial lead placement: the 5th interspace on the midclavicular line;

V4

21

precordial lead placement: placed directly lateral to V4 with V5 on the anterior axillary line and V6 on the midaxillary line.

V5, V6

22

which segment is roughly coincident with phase 2 of the AP?

ST segment

23

that point where the QRS joins the ST segment with an angle normally about 90°

The J point

24

which pacemaker is not included in the PR interval?

the SA node

25

why is the t wave and the qrs upright?

b/c the myocardium repolarizes in the opposite direction from the depolarization event

26

waves and complexes analysis consists of what?

1. Duration
2. Amplitude
3. Morphology
4. Vector

27

p waves are always negative in ______

aVR

28

what is the best lead to look at p waves?

lead 2

29

tall p waves in lead 2 & V1 associated with what abnormality?

right atrial conduction abnormality

30

notched p waves in lead 2 associated with what abnormality?

left atrial conduction abnormality