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Flashcards in ECG collated Deck (39)
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1

How are dipoles created in the heart?

Different regions of the heart being polarised or depolarised

2

What do two dipoles generate?

An electrical field measurable with 2 electrodes

3

What is the imaginary line connecting 2 dipoles?

Lead axis

4

Measured potential difference is greatest when?

The lead axis is parallel to the direction of the dipole and 0 when perpendicular

5

Lead position on a 12 lead ECG?

1= RA- LA
2= RA- LL
3= LA-LL
V1-6

6

Direction moving towards the the recording (+ve elctrode) gives what type of deflection?

Upwards

7

Which electrode is the recording electrode?

Positive

8

Depolarization moving away from positive electrode causes?

Downwards stroke on ECG

9

What does the P wave signify?

Atrial depolarization

10

How long does the P wave last?

0.08-0.1 seconds

11

What does Q wave signify?

Left to right depolarization of the interventricular septum

12

How long should the QRS complex be?

0.08-0.1seconds

13

What does the R wave signify?

Depolarization of the main ventricular mass (moving towards recording electrode)

14

S wave signifies?

Depolarization of ventricles at base of heart (moving away from recording electrode)

15

What does T wave signify?

Ventricular repolarization

16

Where do you place lead 1 of an ECG?

4th IC space, RHS

17

Where do you place lead 2 of an ECG?

4th ICS, LHS

18

Where do you place lead 4 of an ECG?

5th ICS, mid-clavicular line

19

Where do you place lead 3 of an ECG?

Halfway between lead 2 and 4 on the rib/between them

20

Where do you place lead 5 on an ECG?

5th ICS, anterior axillary line

21

Where do you place lead 6 on an ECG?

5th ICS, mid axillary line

22

QRS complex signifies?

Ventricular depolarization (<1s)

23

PR interval signifies?

AV nodal delay

24

How long should PR interval be?

0.12-0.2s

25

QT interval signifies?

Depolarization and repolarization of ventricles

26

What does a small box stand for on an ECG?

0.04s

27

What does a large box stand for on an ECG?

0.2s

28

How to find HR on an ECG?

300/no. of large squares between beats

29

How to find HR if irregular?

no. of QRS in 30 large squares x 10

30

6 steps to analysing an ECG?

1. Verify patient details
2. Check date and time ECG was taken
3. Check calibration of ECG paper
4. Determine axis
5. Workout rhythm
6. Look at individual leads for voltage criteria changes OR any ST or T wave changes