Midterm- physiologic changes in PG Flashcards
Avg weight gain in PG
24-30 lbs
Distribution of weight gain in PG
Fetus: 7-7.5 lbs Placenta and amniotic fluid: 4 lbs Uterine muscle: 2 lbs Breasts: 3 lbs Fat: 3 lbs Blood: 3.3 lbs Extracellular fluid: 6.6 lbs
Increased uterine size stimulated by what hormone? when?
stimulated by estrogen
1st 20 weeks incr size of uterine muscle
2nd 20 weeks thinning of uterine muscle and incr with fetal size
Cervical changes
effacement: softening and shortening
dilation: opening of os
Dilation usu occurs when effacement of cervix is how far along?
50-70% effacement
mask of pregnancy may be due to
folic acid deficiency
linea nigra may be due to
vit B deficiency
hair growth starts
3rd month
hair loss starts
2-4 months post partum
hormone that softens ligaments? purpose?
relaxin
to facilitate expansion of the pelvic girdle
incr blood volume by? for what?
35%
insures good placental perfusion
causes of physiologic edema of preg.
incr capillary pressure sends fluid to tissues
incr capillary permeability
relative Na+ retention
fetal pressure into pelvis causing decr venous return
physiologic effects on pulse and bp
pulse incr by 10-15 bpm
bp remains the same or decr
____ % increase in O2 needed
20%
1/3 for fetus, 2/3 for maternal metabolism
SOB due to
incr restriction of diaphragm and deeper resp needed for inc O2 consumption
anemia
