CTG interpretation

Question 1

When can CTG be used reliably?

Answer 1

After 32 weeks

Question 2

What is a suspicious CTG

What is a pathological CTG?

Answer 2

1 non reassuring feature - sus

2 non reassuring feature - path

Question 3

What is a reassuring baseline rate?

Answer 3

110 - 160 bpm

Question 4

What is an abnormal baseline rate?

Answer 4

<100bpm or
>180 bpm

Question 5

What variability is non reassuring?

Answer 5

Variability of <5bpm for 25 minutes or

> 25bpm for 25 mins

Question 6

What decelerations are worrying?

Answer 6

Variable or late decels for >30 mins
or
single prolonged decel for 3mins

Question 7

What rythm required an immediate CAT1 CS?

Answer 7

Sinusoidal rhythm

smooth, regular wave like pattern cycling at 4hz

Question 8

What do early decels indicate?

Answer 8

Occur during uterine contraction, due to head compressions

Question 9

Why do variable decels occur

Answer 9

cord compression

Question 10

What are late decels?

Answer 10

foetal hypoxia

Question 11

What to do if there is a late decel?

Answer 11

foetal blood sampling, pH <7.2: expedite delivery

Question 12

How to manage a non-reassuring CTG?

Answer 12

Obs review
conservative management
(left lateral position, fluids, stop oxytocin)

consider cat 2 section within 75 mins

Question 13

How to manage a pathological CTG?

Answer 13

fetal blood sampling

• EMCS cat 1 within 30 mins

Question 14

Indications of continuous CTG monitoring during labour?

5

Answer 14

Fresh new onset vaginal blood during delivery

Significant meconium

Oxytocin use

Severe HTN 160/110

Suspected chorio / sepsis / temp 38+