Hypoxia and Foetal Brain Damage Flashcards Preview

Scientific Basis of Midwifery > Hypoxia and Foetal Brain Damage > Flashcards

Flashcards in Hypoxia and Foetal Brain Damage Deck (6)
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What causes localised capillary dilation in hypoxia?

- Falling oxygen
- Falling pH in tissues
- Rising carbon dioxide
- Rising lactic acid


What is unique about preterm babies?

- Capillaries are very fragile in the germinal layer around the ventricles
- Increased dilation of fragile capillaries = periventricular haemorrhage (rupture)


How does the nervous system play a part in attempted prevention of hypoxia?

- During hypoxic episodes, sympathetic and parasympathetic pathways attempt to compensate by stabilising HR and BP
- Episodes of bradycardia associated with sudden rises in BP


What effect does stress have on the foetus?

- Releases adrenaline
- BP increases
- This may cause rupture of small blood vessels


What happens as hypoxia increases?

- Bradycardia and low BP
- Cerebral ischaemia around the ventricles (brain cell death) which may lead to hemiplegia (paralysis of one side of the body)
- Tissue damage may cause blood clots
- Subarachnoid haemorrhage


What can resuscitation procedures cause?

- Raised BP
- Vessel rupture