সাধারণত Implantation হয় upper uterus এ (near to the fundus)।
কিন্তু Placenta previa তে implantation হয় lower uterus এ (near to the internal os)।
যেহেতু দিন দিন lower uterine segment grow করতে থাকে, ফলে placental blood vessel এর disruption হয়। which causes bleeding (After 20 weeks of gestation)
[N:B ➤ Bleeding may be — intermittent or continuous — Can increase during labor]
Types :
01.Complete ➤ completely cover the cervical os
02.Partial ➤ partially covered the cervical os
03.Marginal ➤ extends within 2 cm of cervical os
Risk factors:
01. Multiple pregnancy.
02. When Placenta is larger than normal surface area(e.g.twins).
03. Maternal age >35 years.
04. Intra-uterine fibroids.
Complication:
Maternal ➤➤ Related to blood loss
Fetal ➤➤ Hypoxia & pre- term delivery.
Edited By : Nahid Hassan.
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