CTG Flashcards

0
Q

What is the normal variability on the baseline rate?

A

Should be over 5bpm

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1
Q

What is the normal baseline rate for a CTG?

A

110-160 bpm

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2
Q

How long is the variability allowed to be less that 5bpm for it to be

1) nonreassuring
2) abnormal

A

1) over 40mins

2) over 90mins

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3
Q

What does the acronym DRC BRVADO stand for

A
Define Risk - high or low 
Contractions
Baseline Rate 
Variability 
Accelerations
Decelerations 
Overall impression
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4
Q

How do you read how many contractions?

A

How many in 10 big squares (10 mins)

Eg 3 in 10

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5
Q

What is considered prolonged bradycardia?

What are the causes?

A

Less than 80 for over 3 mins

Cord compression
Spinal/epidural
Maternal seizure
Rapid foetal descent

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6
Q

What is the most common cause of reduced variability for less than 40 mins?

A

The foetus is sleeping

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7
Q

Define an acceleration..

A

Increase from baseline for over 15 bpm for over 15 seconds

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8
Q

Are accelerations reassuring or non reassuring?

A

Reassuring

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9
Q

What is the physiology behind early decelerations?

Pathological or not?

A

It occurs during a contraction and stops when contraction stops.
It is caused by increased foetal intracranial pressure causing increased vagal tone
Not pathological

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10
Q

What is a variable deceleration?

What is it often caused by?

A

No relation to contractions
Cord compression
More likely in those with decreased amniotic fluid

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11
Q

What is a late deceleration?

What might this indicate?

A

Begins at the peak of a uterine contraction and recover after contraction ends
Lack of blood flow to foetus therefore potential hypoxia or acidosis

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12
Q

For “overall impression” what would the three categories be?

A

Normal
Suspicious
Pathological

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13
Q

What features do you need for suspicious or pathological?

A

Suspicious- one nonreassuring

Pathological - two non reassuring or one abnormal

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14
Q

What are typical decelerations?

A

Less that 60bpm for less than 60 seconds

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15
Q

What can cause fetal tachycardia?

A
Prematurity 
Hypoxia 
Fetal distress
Maternal pyrexia 
Salbutamol