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ESA 2- Cardiovascular System > ECG > Flashcards

Flashcards in ECG Deck (14):
1

Describe the placement of limb leads

Red: right arm
Yellow: left arm
Green: left foot
Black: right foot

2

Describe the different views provided by limb leads

LI (RA - LA): 0 d
LII (RA - LF): 60 d
LIII (LA - LF): 120 d

aVF: 90 d
aVL: -30 d
aVR: -150 d

3

Describe the placement of chest leads

V1 (red): 4th IC space, R sternal edge
V2 (yellow): 4th IC space, L sternal edge
V3 (green): between V2 and V4
V4 (brown): 5th IC space, mid-clavicular line
V5 (black): between V4 and V6
V6 (purple): 5th IC space, mid-axillary line

4

Which leads show anterior heart

V3, V4

5

Which leads show inferior heart

LII, LIII, aVF

6

Which leads show septum

V1, V2

7

Which leads show lateral heart

LI, aVL, V5, V6

8

ECG wave upstroke shows...

Depolarisation towards or repolarisation away from positive electrode

9

ECG wave downstroke shows...

Depolarisation away from or repolarisation towards positive electrode

10

What does each segment of the ECG wave show

P wave: atrial depolarisation
PR segment: AVN 120ms delay and bundle of His depolarisation
Q: septum depolarisation (from L to R)
R: ventricular depolarisation (from endo to epicardium)
S: ventricular base depolarisation (towards atria)
ST segment: delay to ensure complete depolarisation
T wave: ventricular repolarisation (epi to endocardium)

11

how may small and large squares make 1 sec

5 large squares
25 small squares

12

1 large square and 1 small square = how many seconds

1 large square = 0.2 secs
1 small square = 0.04 sec

13

how is HR calculated if it is regular? irregular?

Regular: no. of large squares in R - R interval, divided by 300

Irregular: no. of QRS in 30 sqrs (i.e. 6 secs) x 10

14

how is presence of sinus rhythm determined

1. is rhythm regularly regular?
2. what is HR?
3. are P waves present and are they upright in leads I and II?
4. is PR interval normal (3-5 small sqrs)?
5. is every P wave followed by QRS and every QRS followed by P wave?
6. is QRS normal width (<3 small sqrs)?