ECG

Question 1

what does the P wave indicate?

Answer 1

atrial depolarisation

Question 2

how long should a P wave last?

Answer 2

less than 120ms

Question 3

what does the QRS complex represent?

Answer 3

ventricular depolarisation

Question 4

how long should a QRS complex last?

Answer 4

100ms or less

Question 5

what does the T wave represent?

Answer 5

ventricular repolarisation

Question 6

where is the PR interval found?

Answer 6

start of the P wave to the start of the QRS

Question 7

what does the PR interval represent?

Answer 7

the time taken for the SA node impulse to reach the ventricles

Question 8

how long should the PR interval be?

Answer 8

0.12-0.2 seconds

Question 9

where is the ST segment found?

Answer 9

from the end of the QRS to the start of the T wave

Question 10

what does the ST segment represent?

Answer 10

ventricular systole

Question 11

where is the QT interval found?

Answer 11

from the start of the QRS complex to the end of the T wave

Question 12

what does the QT interval reflect?

Answer 12

the time taken for ventricular depolarisation and repolarisation

Question 13

how long should the QT interval be?

Answer 13

males = 440ms 
females = 460ms

Question 14

what does the TP segment represent?

Answer 14

ventricular diastole

Question 15

which ECG leads are lateral?

Answer 15

I

aVL

Question 16

which ECG leads are inferior?

Answer 16

II
III
aVF

Question 17

what should the paper speed on an ECG be?

Answer 17

25 mm/sec

Question 18

what does one large box on an ECG represent?

Answer 18

0.2s

Question 19

what does one small box on an ECG represent?

Answer 19

0.04s

Question 20

how do you calculate the heart rate on an ECG?

Answer 20

300/number of large squares between the R-R interval