ngoai, 16 thoat nay chinh la c6 trr cung. Ap h.rc dan tang Ien khien mang oi bong ra khoi
thanh trr cung, mang oi mat di ch6 d\fa bat dau phong len, day chinh la bao thai. Bao thai ep
dan len c6 trr Cung, khi c6 trr Cung m& ra du rc;mg, khong chiu n6i ap l\fC, mang oi Se VCY,
nU'&C oi chay ra, g9i la v& oi. Neu mang oi khong v& thi phai tien hanh v& oi nhan t�o.
3.
Bit dau lam b6n
Khi CO dau hi�u sap sinh, cac COTI dau CO quy lu�t ding bat dau theo, c6 trr Cung m&
rong, bao thai hinh thanh, CO th� gQi la mot CUOC
VU'Q't
C�n th\fC S\f, nhrmg nhfrng dau hi�u
nay hoan toan khong xuat hi�n cling luc, tr�ng thai c6 trr cung ding rat kh6 xac dinh.
Y h9c lam sang cho r�ng, bat dau lam bon la khi cac COTI dau each nhau trong vong 10
phut.
IV. Ba giai do�n cua qua trlnh lam b6n
Tir tinh hinh sinh n& t\f nhien c6 th� thay, tuy thCri gian sinh n& cua m6i ngmn khac
nhau, nhrmg thong thmmg ngITCri sinh con Ian dau can khoang 14 - 16 tieng, ngITCri da tirng
sinh con can khoang 7-8 tieng.
Khi crra trr cung m& la luc bat dau lam bon, nhrmg do khong th� nam bat chinh xac
th(ri di�m crra trr Cung m&, nen thong thmmg, qua trinh lam bon dU'Q'C tinh tir khi San ph\l
bat dau cam thay dau de c6 quy lu�t.
M�t khac, phan frng khi lam bon ket thuc la nhau thai dU'Q'C dfiy ra ngoai. Neu lam bon
binh thmmg, khoang 20 - 30 phut sau khi dfra tre chao dCri nhau thai se dITqc dfiy ra ngoai.
D� ti�n mieu ta, chung toi chia ca qua trinh lam bon thanh ba giai do�n sinh dIT&i day.
Giai doQ.n sinh th& nhat: Tir khi ell-a trr cung bat dau m& ra cho den khi n6 m& rong
hoan toan. San phv sinh Ian dau can khoang 12 tieng, da tirng sinh can khoang 6 tieng.
Giai doQ.n sinh thu hai: Thai nhi chui ra. San phv sinh Ian dau can khoang tir 2 - 4
tieng, da tirng sinh can khoang mot tieng.
Giai doQ.n sinh thu ba: Tir khi thai nhi ra dCri cho den khi nhau thai dU'Q'C dfiy ra. San
phv sinh con Ian dau va da tirng sinh deu can khoang 20 phut.
I.
Tinh hlnh trong giai do�n sinh thu nhit
(1) Stj biin adi cua
Cd
thi
m�
Khoang each th(ri gian gifra hai COTI CO that trr Cung dan rut ngan, th(ri gian CO that tang
Ien. Dau tien each 20 phut co that 10 giay dan bien thanh each 20 phut co that 20 giay, each
15 phut co that 30 giay, each 10 phut co that 40 giay, each nam phut co that 50 giay.
