OSCE Flashcards
Causes of fetal tachycardia [5]
Foetal hypoxia
Chroioamnionitis
Hyperthyroidism
Foetal/ maternal anaemia
Foetal tachyarrhythmia
Foetal tachycardia is defined as…
Baseline HR >160bpm
Foetal bradycardia is defined as…
Baseline HR <110
Normal causes of foetal bradycardia (HR =100-120)
Post-date gestation
Occiput posterior/ transverse presentation
Causes of prolonged severe foetal bradycardia
Prolonged cord compression
Cord prolapse
Epidural/ spinal anaesthesia
Maternal seizure
Rapid foetal descent
Reassuring variability in a CTG is…
Variation of foetal HR 5-25 bpm
Non-reassuring variability in CTG is…
< 5bpm for 30-50 mins
> 25 bpom for 15-25 mins
Abnormal variability in CTG is…
<5 bpm for >50 mins
> 25 bpm for >25 mins
Causes of reduced variability in CTG
Foetal sleeping (when <40mins)
Foetal acidosis (hypoxia)- present with late decelerations
Foetal tachycardia
Drugs
Early gestation (<28 weeks)
Congenital heart problems.
Drugs that can caused reduced variability on CTG
Opiates
Benzos
Methyldopa
Magnesium sulphate
Accelerations in CTG describes…
Abrupt increase in baseline HR
- > 15bpm
- > 15 seconds.
They normally occur with uterine contractions
Decelerations in CTG describes…
Abrupt decrease in baseline HR
- > 15bpm
- > 15 seconds
Early decelerations in CTG describes…
When deceleration starts at the start of contraction and finishes at the end of contraction ends.
Early decelerations in CTG occurs due to…
Increased ICP from increased vaginal tone
- Physiological
Variable decelerations in CTG describes…
Decelerations with variable recovery phase
- No relation to contractions.