Lesson 1 and 2 Flashcards
is a series of continuous, progressive contractions of the uterus which help the cervix to open (dilate) and to thin (efface), allowing the fetus to move through the birth canal.
Labor
movement of the uterus
Contraction
a series of passive, adoptive movements of the fetal head and shoulders smallest diameter to pass through the birth canal
Mechanism of Labor
are the positional movements that the fetus undergoes to accommodate itself to the maternal pelvis
Mechanism of Labor
Mechanism of Labor
Engagement
Descent
Flexion
Internal Rotation
Extension
External Rotation
Expulsion
the biparietal diameter of the head passes the pelvic inlet
Engagement
the head is fixed in the pelvis
Engagement
occurs when the largest diameter of the fetal head fits into the largest diameter of the maternal pelvis
Engagement
As the fetal head engages, the head moves towards the pelvic brim in either the left or right occipito-transverse position
Engagement
This allows the widest part of the fetal head to fit through the widest part of the pelvic foot
Engagement
the downward movement of the biparietal diameter of the fetal head within the pelvic inlet
Descent
progress of the presenting part through the pelvis
Descent
as Descent occurs, the head bends forward to the chest, making the smallest anteroposterior diameter (the suboccipitobregmatic diameter) present to the birth canal
Flexion
is aided by abdominal muscle contraction during pushing
Flexion
the head enters the pelvis with the fetal anteroposterior head diameter in a diagonal or transverse position
Internal Rotation
fetal skull rotates along the axis from transverse to anteroposterior at pelvic outlet
Internal Rotation
head passes the midpelvis
Internal Rotation
as the occiput (head) is born, the back of the neck stops beneath the pubic arch and acts as a pivot for the rest of the head
Extension
the head extends, and the foremost parts of the head, the face and chin
Extension
almost immediately after the head of the infant is born, the head rotates from the anteroposterior position if assumed to enter
External Rotation
once the shoulders are born, the rest of the baby is born easily and smoothly because of its smaller size
Expulsion
SECOND STAGE OF LABOR – EXPULSION STAGE
Assessment:
signs of imminent delivery
progress descent
maternal/fetal vital signs
maternal pushing effort
vaginal distention
bulging of the perineum
crowning
birth of baby
instrument used to listen to fetal heart tones/heartbeat
doppler
is an incision of the perineum during delivery to enlarge the vaginal opening/outlet
Episiotomy