<prompt> Placenta praevia true are:Incidence increases by two fold after LSCSMore common in primiparaMost common in developed countries1 per 1000 pregnancies  <response>: Ans. A Incidence increase by two fold after LSCS The incidence ranges from 0.5 - 1 amongst hospital delivers.In 80 cases, it is found to multiparous. i.e., not 1 per 1000 pregnancies- Dutta Obstetrics 6th243Increased family planning acceptance with limitation and spacing of birth, lowers the incidence of placenta previa - Dutta Obstetrics 6th 243 i.e. It is less common in develoed countries than in developing countriesAtonic uterus 80Q is the commonest cause of PPH- Dutta Obstetrics 6th 411About 13rd 35 cases of antepartum haemorrhage APH belongs to placeta praevta- Dutta Obstetrics 6th 243Risk of Placenta Previa after CS ; Short discussion Option A correctWilliam Obstetrics 23rd770: says In a study of 30, 132 women in labor undergoing cesa rean delivery, Silver and associates 2006 cited an increased risk of praevia in women who had prior caesarean delivery. The incidence was 1.3 percent for those with one prior cesarean delivery and 3.4 percent in women who has six or more cesarean deliveriesMiller and associates 1996 cited a threefold increased risk for praevia in women with a prior cesarean delivery in more than 150,000 deliveries at Los Angeles County Womens Hospital and the risk for previa increases progressively as parity and number of prior cesarean deliveries increase. Gesteland and co-workers 2004 and Gilliam and colleagues 2000 calculated that the likelihood of previa was increased more than eightfoldr in women with parity greater than four and more than four prior cesareans.The probability of placenta previa is four times greater- in patients with prior cesareans than in patients without uterine scars- Fernando Arias 3rd333Placenta Praevia It is a rare condition in which the placenta grows in the lower part of a pregnant womans uterus covers all or part of the cervix.Aetiology: Abnormal formation of placenta S Abnormal uterus Larges placenta Scarred lining of the uterus endometriumPredisposing Factors: Multi parity Increased material age 35 vrs. Ho previous LSCS or any scar in the uterus myomectomy or hysterectomy Placental size abnormality Succenturiate lobe SmokingBrownes classification for placenta previaType 1 LateralPlacenta dipping into the lower segment but reaching upto the os.Type 2 MarginalPlacenta edge reaches the internal os.Type 3 Incomplete centralPlacenta covers the internal os when closed, but not when fully dilated.Type 4 CentralPlacenta covers the internal os even fully dilated. Type 1 and 2 are called minor degrees and type 3 and 4 called major degrees of placenta previa. Type 1 and 2 can be anterior or posterior Type 2 posterior placenta is also called the dangerous type as it is more likely to be compressed producing cord compression. This can cause fetal asphyxia and even death. Fig: Degrees of placenta praevia with findings on vaginal examination 