ecg basics

Question 1

ECG lead

Answer 1

s not an
electrical cable but a recording of the
heart’s electrical activity, seen from one
particular perspective

Question 2

how many leads in an ecg?

Answer 2

10 leads

Question 3

how many vies in an ecg?

Answer 3

12 views

Question 4

ECG paper

Answer 4

. The way
in which the paper is laid out allows the
interpreter to measure the timing of
events, as well as the size of the various
waveforms. It is important to note that
accurate interpretation of both timing and
size relies on the machine being properly
set up, and the electrodes being placed
correctly

Question 5

Each small square is

seconds

Answer 5

1 mm x 1 mm

0.04 seconds / 40 milliseconds

Question 6

each large square

Answer 6

5 mm x 5 mm

0.2 seconds/ 200 milliseconds

Question 7

Standard paper speed ecg

Answer 7

25 mm/second

Question 8

The vertical, or Y axis, of the ECG

measures

Answer 8

the amplitude of the waveforms in millivolts. The amplitude, or size, of the
waveforms reflect the size of the chambers that are depolarising