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Flashcards in PACES: CTG interpretation Deck (19)
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1

What is the normal range for foetal baseline HR on the CTG?

110-160 bpm

2

After how many weeks gestation can a CTG be reliably used?

32w

3

Recall a physiological cause of sustained foetal tachycardia on the CTG

Prematurity (the HR will fall with maturity)

4

Recall 3 pathological causes of foetal sustained tachycardia on the CTG

Maternal pyrexia
Hypoxia
Foetal distress

5

Which prescription drug can cause sustained foetal tachycardia?

Salbutamol (and other beta agonists)

6

Recall 2 common and 2 very concerning causes of foetal bradycardia on CTG

Common: hypotension, post-dates

Very concerning: placental abruption, uterine rupture

7

What HR as baseline on the CTG is indicative of impending foetal demise?

<90bpm

8

How do you calculate baseline variability?

Distance between highest peak and lowest trough in a 1-min segment of the CTG trace

9

What is normal baseline variability?

5-25 beats/ min

10

What is the most common cause of reduced baseline variability?

Foetal sleep

11

How long may reduced baseline variability last before it becomes concerning?

40 mins

12

How is an acceleration defined on CTG?

Rise in foetal HR >15 bpm for at least 15s

13

What is the expected number of accelerations on a CTG?

2 every 15 mins

14

What change in the CTG is most often seen with contractions?

Accelerations

15

How are decelerations defined on the CTG?

Fall in foetal HR of >15 bpm for more than 15 s

16

What are early decelerations?

Occur with contractions and return to normal by the end of the contraction

17

What is suggested by late decelerations?

Foetal distress

18

What is suggested by variable decelerations?

Cord compression - especially in oligohydramnios

19

What is a sinusoidal trace on CTG?

Undulating sine-wave like baseline with no variability