Labour And Delivery Flashcards
What is the first stage of labour clinically described as?
Between onset and full dilatation of the cervix
What 2 things stimulate PG?
Mechanical damage and increased oestrogen: progesterone ratio
Give 3 things which lead to cervical ripening?
PGs
Relaxin
Oestrogen
What induces oxytocin receptors on the uterus?
What is the action of oxytocin inhibited by?
Oestrogen
Progesterone
Relaxin
What changes lead to cervical ripening?
What triggers it?
Reduction in collagen
Increased GAGs
Increased hyaluronic acid
Reduced collagen fibre aggregation
prostaglandins
What affect do PGs and oxytocin have on contractility?
PGs - more Ca2+ per action potential
Oxytocin - more action potentials due to lowering of threshold
What is the most common variation of a breach position?
Full breech
Give 4 things that can induce labour.
Stimulate PG release
Artificial Pgs
Synthetic oxytocin
Anti-progesteroneagents
What are some ways you can monitor Foetal Physiology during labour?
Heart rate patterns
Maternal temperature
Colour and amount of amniotic fluid
Scalp capillary pH
Name 3 ways in which bleeding is controlled after delivery.
Interlacing muscle fibres constriction the myometrial vessels
Pressure from uterus walls exerted not he placental site
Blood clotting due to torn vessels and sinuses releasing prothrombotic factors
What is the normal rate of blood flow through the placental site?
500-800ml
