Feto-maternal outcomes of patients with placenta previa and accuracy of diagnosis of placenta accreta syndrome at Chris Hani Baragwanath Academic Hospital

Background. The incidence of placenta praevia (PP) is 0.3 - 0.5% of pregnancies and it is a major risk factor for placenta accreta syndrome (PAS). PP and PAS cause immense feto-maternal morbidity and mortality and, as a result, place a huge burden on healthcare resources. Hence, accurate diagnosis prenatally of PP and associated PAS is essential as this allows adequate preparation for potential complications. Objective. To ascertain the accuracy of prenatal diagnosis of PP and PAS, and the feto-maternal effects of these conditions in women diagnosed at Chris Hani Baragwanath Academic Hospital (CHBAH) Methods. This was a retrospective, descriptive study that reviewed the medical files of 55 women diagnosed with PP at CHBAH in 2018. Results. Complete data was obtained for 28 women. The incidence of PP was 0.3%. The mean age, gravity and parity of women with PP were 31.65 (6.0) years, 3.0 (1.3) and 1.7 (1.3), respectively. The mean birthweight was 2 244 (730) g. Eighteen (56.2%) of newborns had birth weight <2 500g. The incidence of adverse outcomes was increased in patients with suspected PAS on prenatal ultrasound compared with patients showing no prenatal ultrasound evidence of PAS. Ultrasound had a positive predictive value of 50% while MRI correctly identified PAS in 33.3% of patients. Conclusion. PP and PAS increase the likelihood of maternal and neonatal morbidities. Ultrasound is a useful tool in evaluating placenta implantation and can assist in anticipating adverse feto-maternal outcomes in PP and PAS. MRI has limited clinical value in this setting Keywords. Placenta praevia (PP), Placenta accreta syndrome (PAS), Chris Hani Baragwanath Academic Hospital (CHBAH), Magnetic Resonance Imaging (MRI) currently, and should not be done routinely.