Question

The F channel has a _______ ms pulse generator that is triggered by the foetal ECG.

(a) 5

(b) 10

(c) 20

(d) 30

Answer 1

The correct option is (d) 30

The explanation: The F channel has a 30 ms pulse generator that is triggered by the foetal ECG. It is inhibited, however, by the blanking pulse from the M channel, so it will not generate a pulse in response to the maternal ECG signal feeding through to the F channel.