CTG monitoring Flashcards
What can CTG’s show?
- frequency of uterine contractions
- foetal heart rate
What are the timings of mild, moderate and strong contractions?
Mild = <20 secs Moderate = 20-40 secs Strong = >40 secs
What monitoring should be done in low-risk labours?
Intermittent auscultation:
- 1 min after each contraction
- every 15 mins in 1st stage labour
- every 5 mins in 2nd stage labour
When is CTG done?
In high-risk labours:
- irregular heart rate
- intrapartum complications
What is a sign of foetal distress on CTG?
- deceleration of foetal heart rate after a uterine contraction
- hyper contractility of uterus
Which medication can reduce uterine contractions?
Terbutaline - tocolytic drug (Beta 2 target) - relaxes myometrium
How can CTG be recorded?
- Using 2 sensors (one measures tension on mothers abdomen - uterine contractility), other measures foetal heart rate
What are indications for CTG?
ANYTHING abnormal
When can foetal blood sampling be done?
When mother is >5cm dilated
What does foetal blood sampling show?
pH - to determine hypoxia.
What should be done in different pH levels of babies blood?
pH > 7.25 - repeat in 1 hr if CTG normal
pH 7.21-7.24 - repeat in 30 mins if CTG normal
pH <7.20 - deliver immediately
What is hypoxia a risk of?
its the cause of 10% of cerebral palsy
How else can a foetus heart rate be measured?
- By foetal scalp electrode
