00:00 / 00:00
Fibrocystic breast changes
Paget disease of the breast
Intrauterine growth restriction
Pelvic inflammatory disease
Gestational trophoblastic disease
Germ cell ovarian tumor
Polycystic ovary syndrome
Premature ovarian failure
Sex cord-gonadal stromal tumor
Surface epithelial-stromal tumor
Congenital cytomegalovirus (NORD)
Congenital rubella syndrome
Neonatal herpes simplex
Preeclampsia & eclampsia
Female sexual interest and arousal disorder
Genito-pelvic pain and penetration disorder
Fetal alcohol syndrome
Fetal hydantoin syndrome
Hypospadias and epispadias
Benign prostatic hyperplasia
Male hypoactive sexual desire disorder
Benign breast conditions: Pathology review
Breast cancer: Pathology review
Cervical cancer: Pathology review
Complications during pregnancy: Pathology review
Congenital TORCH infections: Pathology review
Disorders of sex chromosomes: Pathology review
Disorders of sexual development and sex hormones: Pathology review
HIV and AIDS: Pathology review
Ovarian cysts and tumors: Pathology review
Penile conditions: Pathology review
Prostate disorders and cancer: Pathology review
Sexually transmitted infections: Vaginitis and cervicitis: Pathology review
Sexually transmitted infections: Warts and ulcers: Pathology review
Testicular and scrotal conditions: Pathology review
Testicular tumors: Pathology review
Uterine disorders: Pathology review
Vaginal and vulvar disorders: Pathology review
0 / 6 complete
0 / 1 complete
In this condition, the placenta implants in the lower uterus, close to or even covering the uterine opening, called the internal cervical os, and it can therefore easily bleed, which usually happens after 20 weeks of gestation.
In fact, endometrial damage from things like a previous cesarean section, an abortion (which could be induced or spontaneous), uterine surgery, and multiparity or multiple pregnancies can decrease vascularization and increase the risk of placenta previa.
In other cases, risk factors for placenta previa include having multiple placentas or a placenta with a larger than normal surface area, which can both happen with twins or triplets, as well as maternal age of 35 years or more, intrauterine fibroids, and maternal smoking.
Placenta previa is classified by how close the placenta is to the cervical os, it can be complete where the placenta completely covers the cervical os; partial where the placenta partially covers the cervical os; or marginal where the edge of the placenta extends to within 2 cm of the cervical os.
This usually a sudden onset of painless bright red bleeding that typically happens after 20 weeks gestation.
Placenta previa is a pregnancy complication in which the placenta implants in the lower uterus and partially or fully covers the internal cervical os, making vaginal delivery difficult or impossible. It can cause heavy vaginal bleeding and a serious threat to both the mother and the fetus. Symptoms include painless vaginal bleeding in the third trimester, and some risk factors are previous placenta previa, multiple gestation, and uterine fibroids.
Copyright © 2023 Elsevier, its licensors, and contributors. All rights are reserved, including those for text and data mining, AI training, and similar technologies.
Cookies are used by this site.
USMLE® is a joint program of the Federation of State Medical Boards (FSMB) and the National Board of Medical Examiners (NBME). COMLEX-USA® is a registered trademark of The National Board of Osteopathic Medical Examiners, Inc. NCLEX-RN® is a registered trademark of the National Council of State Boards of Nursing, Inc. Test names and other trademarks are the property of the respective trademark holders. None of the trademark holders are endorsed by nor affiliated with Osmosis or this website.