Functions and controls of the ECG machine

Question 1

Normal paper speed and alternative

Answer 1

25mm/s
50mm/s to reveal hidden ECG findings at slower rates e.g. atrial flutter in a 2:1 block

Question 2

ECG square

Answer 2

0.04s = one small square
0.2s = 1 big square
1mm = 1 small square
0.1mV= 1 small square

Question 3

Filters

Answer 3

150Hz to 35Hz

Question 4

Gain

Answer 4

10mm/mV
5mm/mV if complexes with high amplitude overlap