Physiology of 2nd Stage Labour Flashcards
What is the definition of 2nd stage labour?
Traditionally defines as the time from full dilation of the cervix to the time when the baby is born
What are the signs of second stage labour?
Show (blood stained music)
Position of mother
Appearance of presenting part
Typical variable declarations in fetal heart
Dilation
Anal cleft line/ purple line
Appearance of rhomboid of Michaelis
What are the factors that force the expelling of the fetus from the uterus?
Activity from the myometrium (primary power)
Muscles of the abdomen and diaphragm (secondary power)
What can the women usually experience during labour?
- Strong, regular and repetitive contractions
- Involuntary pushing or bearing down
- The pain in second stage of labour is often less as cervical dilation is complete, and the women is aware that progress is rapid
What happens if the position of the head is not oxiput anterior?
Then during the time between the contractions the baby will recede back and rotates
What is the passive phase?
Full dilation of the cervix in the absence of involuntary expulsive contractions during which descent an rotation occurs
What is the active phase?
The baby is visible, and or expulsive contractions with full dilation or other signs of full dilation
What is the Ferguson reflex?
A neuroendocrine reflex in which the fetal distension of the cervix stimulates a series of neuroendocrine responses, leading to oxytocin production.
When the body “expels” a baby involuntarily — that is, without forced pushing on the mothers part.